Page 1
AUTOMATIC TRANSAXLE
CONTENTS
PRECAUTIONS AND PREPARATION
Precautions .................................................................. 5
Preparation ................................................................... 5
AUTOMATIC TRANSAXLE FLUID (ATF)
Change.......................................................................... 7
Change Interval ........................................................... 7
Inspection ..................................................................... 7
A/T SYSTEM
Shift Mechanism .......................................................... 9
Control System Diagram .........................................10
Remarks on Fail-Safe Function .............................. 10
TROUBLE DIAGNOSIS
SECTION
Inspection During Idle.............................................. 30
Road Test Part 1 .......................................................3 2
Road Test Part 2 .......................................................3 4
Road Test Part 3 .......................................................3 6
Shifting Speed ...........................................................3 8
Lockup Speed ............................................................38
Trouble Diagnosis by Symptoms ...........................39
A/T Control Unit Input/Output Signal
Standards ...................................................................48
CONSULT-II Function...............................................50
Self-Diagnosis ........................................................... 50
Self-Diagnosis (Without Using CONSULT-II) ......53
VEHICLE SPEED SENSOR 1 (OUTPUT SHAFT
REVOLUTION SENSOR) SYSTEM
AT
Fail-Safe Function ..................................................... 11
Trouble Diagnosis Procedure.................................. 12
Diagnosis Flow .......................................................... 13
Diagnosis Sheet ........................................................1 4
Components Location .............................................. 17
Circuit Diagram .........................................................18
Wiring Diagram .........................................................1 9
Preliminary Inspection .............................................2 5
St a l l Tes t ..................................................................... 25
Defective Section ......................................................27
Line Pressure Test .................................................... 27
Trouble Location........................................................ 29
Road Test.................................................................... 29
Inspection before Engine Start............................... 30
Inspection Procedure................................................ 55
Component Inspection .............................................56
VEHICLE SPEED SENSOR 2 SYSTEM
A/T Control Unit Input/Output Signal Standard .. 57
Inspection Procedure................................................ 57
Component Inspection .............................................58
THROTTLE POSITION SENSOR SYSTEM
CONSULT-II Data Monitor Display........................5 9
A/T Control Unit Input/Output Signal
Standards ...................................................................59
Inspection Procedure................................................ 59
Components Inspection ...........................................61
Page 2
CONTENTS
SHIFT SOLENOID A SYSTEM
A/T Control Unit Input/Output Signal
Standards ................................................................... 63
Inspection Procedure................................................ 63
Component Inspection ............................................. 64
SHIFT SOLENOID B SYSTEM
A/T Control Unit Input/Output Signal
Standards ................................................................... 65
Inspection Procedure................................................ 65
Component Inspection ............................................. 66
OVERRUN CLUTCH SOLENOID SYSTEM
A/T Control Unit Input/Output Signal
Standards ................................................................... 67
Inspection Procedure................................................ 67
Component Inspection ............................................. 68
LOCKUP SOLENOID SYSTEM
CONSULT-II Data Monitor Display ........................ 69
A/T Control Unit Input/Output Signal
Standards ................................................................... 69
Inspection Procedure................................................ 69
Component Inspection ............................................. 70
FLUID PRESSURE SENSOR SYSTEM AND A/T
CONTROL UNIT POWER SYSTEM
CONSULT-II Data Monitor Display ........................ 71
A/T Control Unit Input/Output Signal
Standards ................................................................... 71
Inspection Procedure................................................ 71
Component Inspection ............................................. 73
ENGINE CIRCUIT SIGNAL SYSTEM
Inspection Procedure................................................ 74
LINE PRESSURE SOLENOID SYSTEM
CONSULT-II Data Monitor Display ........................ 76
A/T Control Unit Input/Output Signal
Standards ................................................................... 76
Inspection Procedure................................................ 76
Component Inspection ............................................. 77
INHIBITOR SWITCH, O/D SWITCH, IDLE SWITCH
AND FULL SWITCH SYSTEMS
Inspection Procedure................................................ 79
Component Inspection ............................................. 82
TROUBLE DIAGNOSIS BY SYMPTOMS
A/T CHECK Indicator Light does not Turn ON .... 84
Engine does not Start in P and N Ranges ........... 8 5
The Vehicle Moves in P Range when Pushed...... 86
The Vehicle Drives in N Range............................... 8 6
Too much Shift Shock when Shifting from N to R
Range .......................................................................... 88
The Vehicle cannot Drive in R Range or
Extremely Bad Acceleration .................................... 89
The Vehicle cannot Drive in D, 3, 2, 1 Range or
Extremely Bad Acceleration .................................... 91
The Vehicle does not Start from D1 ...................... 93
Does not Shift from D1 to D2 in D Range.
Does not Kickdown from D4 to D2......................... 96
Does not Shift from D2 to D3 in D Range ............ 98
Does not Shift from D3 to D4 in D Range .......... 101
Does not Lockup .....................................................10 3
Does not Maintain the Lockup State ...................104
Lockup does not Release ......................................10 5
Engine Speed does not Drop to Idle RPM
when Decelerating in D Range (D4 → D3) ......... 106
Does not Shift from D4 to D3 in D Range under
When Shifted from D to 3......................................108
Does not Shift from D3 to 2
Lever is Moved from D Range to 2 Range ......... 109
Does not Shift from 2
Lever is Moved from 2 Range to 1 Range .......... 1 09
No Engine Brake in “1” Range .............................. 110
Cannot do Self-Diagnosis...................................... 110
A/T Shift Lock does not Work Properly .............. 115
SHIFT CONTROL SYSTEM
Shift Control System .............................................. 119
Removal • Installation of Control Device............ 119
Removal • Installation of Control Cable ............. 119
Adjustment During Installation ............................. 120
2
when Selector
2
to 11 when Selector
Page 3
CONTENTS
CONTROL VALVE AND ACCUMULATOR
Removal • Installation ............................................ 121
INHIBITOR SWITCH
Removal • Installation ............................................ 123
A/T Position Inspection .......................................... 1 23
A/T Position Adjustment ........................................ 1 23
VEHICLE SPEED SENSOR 1
(OUTPUT SHAFT REVOLUTION SENSOR)
Removal • Installation ............................................ 124
SIDE OIL SEAL
Removal • Installation ............................................ 125
SHIFT LOCK SYSTEM
Components Location ............................................126
Shift Lock Circuit Diagram .................................... 126
AIR BLEEDER HOSE
Removal • Installation ............................................ 127
TRANSAXLE ASSEMBLY
Removal from the Vehicle ..................................... 128
Removal • Installation ............................................ 129
Standard Model .......................................................1 31
Fluid Pressure Circuit Hole ................................... 13 4
Adjust Shim, Neutral Bearing, Thrust Washer
and Snap Ring Location - standard model......... 135
Clutch and Brake Specification ............................ 136
DISASSEMBLY
Disassembly ............................................................. 137
COMPONENT REPAIR
Manual Shaft ............................................................ 149
Oi l Pump ................................................................... 151
Control Valve Assembly......................................... 155
Control Valve Upper Body ..................................... 163
Control Valve Lower Body ..................................... 166
UNIT ASSEMBLY REPAIR
Reverse Clutch ........................................................169
High Clutch............................................................... 174
Forward Clutch & Overrun Clutch ........................ 17 9
Low and Reverse Brake ......................................... 185
Rear Internal Gear, Forward Clutch Hub and
Overrun Clutch Hub ................................................ 189
Output Shaft, Idler Gear, Reduction Gear and
Bearing Retainer .....................................................19 3
Band Servo Piston Assembly................................ 198
Final Drive ................................................................ 203
ASSEMBLY
Assembly ..................................................................207
SPECIFICATIONS
General Specifications ........................................... 227
Shifting Speed .........................................................227
Lockup Speed ..........................................................227
Control Valve Specifications ................................. 22 8
Control Valve Spring Specifications .................... 22 8
Accumulator Spring ................................................ 229
Accumulator O-ring ................................................229
Band Servo ............................................................... 229
Band Servo Return Spring..................................... 229
Clutch Brake ............................................................ 230
Oi l Pump ................................................................... 23 0
Planetary Carrier ..................................................... 231
Input Shaft ................................................................ 231
Reduction Gear ....................................................... 231
Reduction Gear Adjust Shim ................................23 1
Output Shaft............................................................. 231
Output Shaft Adjust Spacer ..................................232
Bearing Retainer .....................................................23 2
Total Endplay ........................................................... 232
Total Endplay Bearing Race .................................. 232
Reverse Clutch Drum Endplay ............................. 232
Page 4
CONTENTS
Reverse Clutch Drum Endplay Thrust
Washer ...................................................................... 23 2
Final Drive ................................................................ 233
Differential Side Gear Clearance .........................23 3
Shift Solenoid Valve ............................................... 234
Resistance ................................................................ 234
ATF Temperature Sensor ....................................... 23 4
Revolution Sensor................................................... 2 34
Dropping Resistor ................................................... 234
Page 5
PRECAUTIONS AND PREPARATION
Precautions
Caution
Always use “Genuine NISSAN ATF Matic Fluid D or equivalent” as ATF.
Apply Genuine NISSAN ATF Matic Fluid D or equivalent on the O-rings and oil seals.
Choose clean location for operation and perform the disassembly operation in limited space as much
as possible.
Wipe out all sand and mud on the unit surfaces using a steam or white gasoline before disassembly
and be careful not to let them enter into the unit during disassembly and assembly. (Do not let steam
enter into the transaxle to wipe the rubber material components with gasoline.)
Remove the torque converter from the unit and drain the ATF after cleaning.
Check for any damages, deformations or wear at component exterior after disassembly. Replace
with new component(s) if necessary.
Replace the gasket, O-ring, D-ring and lip seal at each disassembly.
Tighten the bolts from the center to outer edge diagonally in 2 to 3 turns. Be sure to follow the
instructions if the sequence is specified.
Be careful not to damage the mating surfaces.
Use paper towel during operation.
Use bare hands or vinyl gloves for disassembly and assembly operation.
Do not use cotton gloves or cloth dusters to prevent the waste thread to get into the system.
Check the assembling direction for thrust bearing races and perform the operation after applying the
vaseline to fit correctly.
Observe the specified torque during assembly. Always apply new Genuine NISSAN ATF Matic Fluid
D or equivalent or vaseline on the components.
Follow the local laws and regulations for wasting or cleaning the used fluids after ATF change.
Special Service Tools
Item Description
Drift
ST35325000
KV31103000
ST2505S001
Oil pressure gauge set
ST25051001
Oil pressure gauge
ST25052000
Hose
ST25053000
Joint pipe
ST25054000
Adapter
ST25055000
Adapter
Pressure output plug
wrench
ST25480000
Drift
ST33200000
Installing differential oil seal
Measuring line pressure
Remove fluid pressure detection plug
Installing differential side bearing inner races
Preparation
AT- 5
Page 6
PRECAUTIONS AND PREPARATION
Item Description
Clutch spring compressor
KV31103200
Pin punch
ST23540000
Pin punch
KV32101000
ST3306S001
Differential side bearing
puller set
ST33051001
Puller
ST33061000
Adapter
Puller
KV381054S0
Puller
ST27180001
Puller
ST30031000
Removing and installing each clutch return spring
Installing parking rod plate and manual plate retaining pins
Removing and installing pinion mate shaft lockpin
Removing differential side bearing inner races
Removing idler gear bearing outer race
Removing differential side oil seals
Removing differential side bearing outer races
Removing output shaft outer race
Removing idler gear and output gear
Removing reduction pinion gear bearing inner race
Drift
ST35272000
Drift
ST37830000
Drift
ST30633000
Drift
ST35271000
Drift
ST33400001
Preload adapter
KV38105710
Drift
KV40104840
Installing reduction pinion gear bearing inner race
Installing idler gear bearing inner race
Installing output gear bearing inner race
Installing idler gear bearing outer race
Installing differential side bearing outer race
Installing idler gear and output gear
Installing oil pump oil seal and output gear outer race
Measuring clearance between side gear and differential case
Installing output shaft bearing outer race
AT- 6
Page 7
AUTOMATIC TRANSAXLE FLUID (ATF)
Automatic Transaxle Fluid (ATF)
Change
For ATF change, fill the new fluid to the charging pipe during idle and at the same time drain the fluid
from the radiator cooler hose return side.
If the drained fluid color becomes similar with the new fluid, end the process. The amount of new
fluid should be 3 to 5 % of the specified capacity.
ATF specification: Genuine NISSAN ATF Matic Fluid D or equivalent
Specified capacity: Approx. 7.0 liters
CAUTION:
Use “Genuine NISSAN ATF Matic Fluid D or equivalent” for RE4F03B as an ATF. If other
company’s ATF is used or mixed with other fluids, it may cause deteriorated performance.
Use a paper towel and do not use cloth with fluff.
Always inspect the ATF level after change.
Change Interval
Normal conditions: Replace during disassembly
Severe conditions: Refer to MA section.
REFERENCE:
Use the ATF tester for change determination under severe conditions.
Clean zone: Normal
Yellow zone: Change right away
Red zone: Change
Inspection
FLUID LEVEL INSPECTION
For level inspection, follow the steps below to be in the “HOT” range (ATF temperature: 50 - 80°C).
1. Warm up the engine and drive for approx. 10 minutes. (When ambient temperature is 20°C, the ATF
temperature usually increases to approx. 50 - 80°C with 10 minutes of driving).
2. Park the vehicle on the level ground.
3. Securely apply the parking brake.
4. At engine idle, select the lever from “P” to “1” while stepping on the brake pedal.
5. Check if the ATF level is at fluid level gauge’s “HOT” range in “P” or “N” position.
CAUTION:
When it is needed to inspect the ATF level at low ATF temperature (30 - 50°C) or changing ATF,
adjust the fluid level to the “COLD” level first and check again the ATF level to be the HOT
range.
Use a paper towel when wiping out the ATF from the fluid level gauge.
Securely fasten the fluid level gauge to the charging pipe with a stopper.
AT- 7
Page 8
AUTOMATIC TRANSAXLE FLUID (ATF)
CONDITION INSPECTION
ATF Condition Possible Cause Required Operation
Varnishing
(It becomes tacky
as varnish)
Milky white or
dark while
Metal particles
much mixed
The clutch and band
are burning
Water mixed
The moving parts of the
A/T is wearing out too
much
Change the ATF and
inspect for any defects in
A/T assembly or vehicle
(such as harness wire and
cooler pipe)
Change ATF and inspect
for any water inflow
Change ATF and inspect
for any A/T bad operation
AT- 8
Page 9
Shift Mechanism
COMPONENTS AND OPERATION
A/T SYSTEM
A/T System
3
Reverse
clutch
(R/C)
P
R
N
1st
2nd
D
3rd
4th
1st
3
2nd
3rd
1st
2
2nd
3rd
1st
1
2nd
3rd
High
clutch
(H/C)
Forward
clutch
(F/C)
Overrun
clutch
(O/C)
Band servo
2nd apply 4th apply
3rd release
1
2
1
1
Forward one-
way clutch
(F/O C)
Low one-
way clutch
(L/O C)
Low and
reverse brake
(L&R/B)
Remarks
Park
Reverse
Neutral
Automatic shift
1 ↔ 2 ↔ 3 ↔ 4
Automatic shift
1 ↔ 2 ↔ 3
Automatic shift
1 ↔ 2 ← 3
Automatic shift
1 ← 2 ← 3
1: Oil pressure is applied to both 2nd “apply” side and 3rd “release” side of band servo piston. How-
ever, brake band does not contract because fluid pressure area on the “release” side is greater
than that on the “apply” side.
2: Fluid pressure is applied to 4th “apply” side in condition “1” above, and brake band contracts.
3: A/T will not shift to 4th when overdrive switch is set in “OFF” position (3rd).
Tightens.
Operates under accelerating condition.
Operates but not work for power transmission.
Engages by less than set accelerator travel, but not work for engine brake.
Engages by less than set accelerator travel and work for engine brake.
AT- 9
Page 10
Control System Diagram
A/T SYSTEM
Remarks on Fail-Safe Function
The A/T control unit has an electronic fail-safe. This allows the vehicle to be driven even if a major
electrical input/output device circuit is damaged. Under fail-safe, the vehicle always runs in third gear
with shift lever position of 1, 2 or D, customer may say “sluggish, poor acceleration”. When fail-safe
operation occurs the next time the ignition key is turned to the ON position, the O/D OFF indicator light
will blink for approx. 8 seconds. {Refer to “Self-Diagnosis” (Without Using CONSULT-II) (AT-53)}.
Fail-safe may activate without electrical circuit damages if the vehicle is driven under extreme conditions (such as excessive wheel spins and emergency braking immediately afterwards). In this case, turn
ignition key OFF for 5 seconds and then ON to recover normal shift pattern. The blinking of the O/D
OFF indicator light for about 8 seconds will appear only once and be cleared. The customer may resume normal driving conditions by chance. Always follow the “Diagnosis Program”. When self-diagnosis is operated, the following results will occur.
At first, damage is indicated at the vehicle speed sensor 1 or 2. When performing the self-diagnosis
again after sensor inspection, nothing will be indicated.
AT- 10
Page 11
TROUBLE DIAGNOSIS
Trouble Diagnosis
Fail-Safe Function
When defect is found at sensors and solenoids, it allows driving under the fail-safe function as below.
VEHICLE SPEED SENSOR
Two vehicle speed sensor signals are input from the vehicle speed sensor 1 (revolution sensor)
installed to the transaxle and the vehicle speed sensor 2 from the meter control unit inside the
combination meter. Therefore, it is possible to drive the vehicle in normal condition even though one
of the systems is malfunctioning.
THROTTLE POSITION SENSOR
It calculates the accelerator opening by the idle switch and full switch and then controls the line
pressure as below if the throttle sensor is malfunctioning.
Idle switch
-
“OFF”
“ON”
Full switch
“ON”
“OFF”
“OFF”
Line pressure
Max. pressure
Min. pressure
Accelerator
Throttle position 4 / 8
Throttle position 2 / 8
Throttle position 0 / 8
INHIBITOR SWITCH
When multiple signals are inputted to the A/T control unit from the inhibitor switch, A/T control unit
determines the priority of the selector lever position as D, N, R, 2, 1 in order.
But, while resuming normal operation, 4th gear is prohibited and actual vehicle driving conditions
will be as chart below because the control valve’s fluid pressure circuit is converted to manual valve
by the selector lever position.
Actual selector position
P range
R range
D range
D 3 range
2 range
1 range
Input signal of the inhibitor switch
“P” and other range signals
“R” and other range signals
“N” and other range signals
“D” and other range signals
“2” and other range signals (except for “1” range signal)
“2” and “1” range signals
“1” and other range signals (except for “1” range signal)
“1” and “2” range signals
Vehicle driving status
P
R
N
1 ↔ D2 ↔ D3
D
21 ↔ 2 2 ↔ 23
21 ← 22
11 ↔ 12 ↔ 13
11 ← 12
AT-11
Page 12
TROUBLE DIAGNOSIS
SHIFT SOLENOID A AND B
When the solenoid is defective, the gear position will as below so that the normal driving is possible.
Selector
position
D range
3 range
2 range
1 range
When normal
A
x
x
x
x
x
x
x
x
Gear
B
x
x
x
x
x
1st
2nd
3rd
4th
1st
2nd
3rd
1st
2nd
3rd
1st
2nd
3rd
When solenoid A is
defective
B
A
→ x
-
→ x
-
-
-
→ x
-
→ x
-
-
→ x
-
→ x
-
-
→ x
-
→ x
-
-
Gear
x
x
x
x
x
3rd
: Continuity x : No continuity - : When defective
When solenoid B is
defective
A
→ x
x
x
→ x
→ x
x
x
→ x
x
x
→ x
x
x
B
-
-
-
-
-
-
-
-
-
-
-
-
-
Gear
3rd
When solenoid A & B
are defective
A
-
-
-
-
-
-
-
-
-
-
-
-
-
Gear
B
-
-
-
-
-
-
-
-
-
-
-
-
-
3rd
LINE PRESSURE SOLENOID
When solenoid signal is inputted in the A/T control unit, it turns the line pressure solenoid “OFF” and
increases the line pressure to maximum.
LOCKUP SOLENOID
When defective solenoid signal is inputted in the A/T control unit, it turns the lockup solenoid “OFF”
and releases the lockup.
OVERRUN CLUTCH SOLENOID
When defective solenoid signal is inputted in the A/T control unit, it turns the overrun clutch solenoid
“OFF” and allows engine brake while decelerating by operating the overrun clutch.
Trouble Diagnosis Procedure
In order to perform the trouble diagnosis quickly and accurately, it is important to properly understand the
defective symptoms. The same trouble symptom may be understood differently according to customers. It is
necessary to understand the details of trouble symptoms and occurrence for customer’s complaints.
For proper troubles diagnosis, use the “Trouble Sheet” and “Diagnosis Sheet”.
INTRODUCTION
A/T control unit receives signals from vehicle speed sensor, throttle position sensor or inhibitor switch
and controls the shift and the lockup by the solenoid valves. When A/T is operating, input and output
signals should always be accurate and stable. For normal operation of the A/T system, all valves
including solenoid valves should be in good state.
Intermittent troubles are more difficult than continuous troubles to be diagnosed. Intermittent troubles
can be caused by electrical bad connections or defective wirings. In those cases, check the related
circuits thoroughly but be carefully not to change components by misjudgment.
It is impossible to find the accurate cause of trouble only by visual inspection. In this case, perform
the road test by connecting CONSULT-II or circuit tester according to “Diagnosis Flow”.
Before starting inspection, listen to customer complaints especially for the drivability troubles. In
case of intermittent trouble, there could be information for proper diagnosis.
Determine the troubling conditions by using “Diagnosis Sheet”.
First of all, start to diagnose from the basic components or sections. If so, electronic control vehicle’s
drivability problems can be diagnosed more easily.
AT- 12
Page 13
Diagnosis Flow
TROUBLE DIAGNOSIS
AT-13
Page 14
TROUBLE DIAGNOSIS
DIAGNOSIS SHEET
Customer Information
Key Points
What - Vehicle and engine model
When - Date, frequency
Where - Road conditions
Conditions - Driving conditions, circumstances
How - Symptoms
Customer Name
A/T Model
Incident date
Frequency
Symptoms
A/T CHECK indicator
Engine
Registered date
Continuous Under certain conditions Intermittent (Times/Day)
Vehicle does not move. ( Any position Particular position)
No up-shift ( 1st → 2nd 2nd → 3rd 3rd → O/D)
No down-shift ( O/D → 3rd 3rd → 2nd 2nd → 1st)
Lockup malfunction
Shift point too high or too low
Shift shock and slip ( N → D Lockup D1 → D2 N → R)
Noise or vibration
No kickdown
No shift pattern changes when range is changed
Others
Blinks for approx. 8 seconds
Stays ON
Vehicle Model
VIN
Mileage (km)
Check-in date
Does not come ON
Diagnosis Sheet
Read the fail-safe remarks and listen to customer complaints
1
Check ATF
2
Stall test and line pressure inspection
3
Leakage (Repair the defective part)
Condition
Level
Stall test
Line pressure inspection - Defective component
Torque converter one-way clutch
Reverse clutch
Forward clutch
Overrun clutch
Forward one-way clutch
Low and reverse brake
Low one-way clutch
Engine Low line pressure
Remove the high clutch and
brake band
(AT - 10)
(AT - 25)
(AT - 25),
(AT - 27)
AT- 14
Page 15
TROUBLE DIAGNOSIS
Perform all road tests and mark on the required procedures
4.1
4
4.2
4.3
Inspection before engine start
Perform self-diagnosis - Mark on the detected items
Inhibitor switch
Fluid temperature sensor
Vehicle speed sensor-1 (A/T)
Engine speed signal
Lockup solenoid valve
Line pressure solenoid
Shift solenoid valve A
Shift solenoid valve B
Throttle position sensor
Overrun clutch solenoid valve
Inhibitor switch, O/D switch, idle switch and full switch
Fluid temperature sensor and A/T control unit power
Vehicle speed sensor 2 (Meter)
Battery
Others
Inspection during idle
A/T CHECK indicator light does not come on
Engine does not start at “P” or “N” range
Vehicle moves in “P” range when pushed
Vehicle moves in “N” range
Too much shock when shifting from “N” range to “P” range
Cannot reverse in “R” range
Cannot go forward in “D”, “2”, “1” range
Road test
Part 1
Does not start from “D1”
No shift from “D1” to “D2”. Or no kickdown from “D4” to “D2”
No shift from “D2” to “D3”
No shift from “D3” to “D4”
No lockup
Lockup is not continued
Lockup does not release
Engine speed does not drop to idle RPM
Part 2
Does not start from “D1”
No shift from “D1” to “D2”. or No kickdown from “D4” to “D2”
No shift from “D2” to “D3”
No shift from “D3” to “D4”
(AT - 29)
(AT - 30)
(AT - 30)
(AT - 32),
(AT - 34),
(AT - 36)
AT-15
Page 16
TROUBLE DIAGNOSIS
Part 3
No shift from “D4” to “D3” when the shift lever is moved to “3”
Engine speed does not drop to idle RPM
No shift from “D3” to “D2” when selector lever is moved from “3” to “2”
No shift from “D2” to “D1” when selector lever is moved from “2” to “1”
No engine brake
Mark on the item detected while self-diagnosis
Inhibitor switch
Fluid temperature sensor
Vehicle speed sensor 1 (A/T)
Engine speed signal
Lockup solenoid valve
Line pressure solenoid
Shift solenoid valve A
Shift solenoid valve B
Throttle position sensor
Overrun clutch solenoid valve
Inhibitor switch, O/D switch, idle switch and full switch
Fluid temperature sensor and A/T control unit power
Vehicle speed sensor 2 (Meter)
Battery
Others
Inspect each systems detected as NG during self-diagnosis and repair or replace the
5
6
7
8
defective component
Perform the inspection before driving and mark on the required item
Perform the “Diagnosis Flow” for the remaining NG items and repair or replace the
defective component. Refer to “Diagnosis by Symptoms” chart (The chart also contains
other symptoms and inspection procedure).
Erase the self-diagnosis results from the A/T control unit
(AT - 29)
(AT - 39)
(AT - 51)
(AT - 54)
AT- 16
Page 17
Components Location
TROUBLE DIAGNOSIS
AT-17
SAT881K
Page 18
TROUBLE DIAGNOSIS
Circuit Diagram
AT- 18
Page 19
TROUBLE DIAGNOSIS
Wiring Diagram AT/AT-01
AT-19
Page 20
TROUBLE DIAGNOSIS
Wiring Diagram AT/AT-02
AT- 20
Page 21
TROUBLE DIAGNOSIS
Wiring Diagram AT/AT-03
AT-21
Page 22
TROUBLE DIAGNOSIS
Wiring Diagram AT/AT-04
AT- 22
Page 23
TROUBLE DIAGNOSIS
Wiring Diagram AT/AT-05
AT-23
Page 24
TROUBLE DIAGNOSIS
Wiring Diagram AT/AT-DEVICE
AT- 24
Page 25
TROUBLE DIAGNOSIS
Preliminary Inspection
ATF INSPECTION
LEAKAGE AND FLUID LEVEL
Inspect the leakage and fluid level.
For level inspection, follow the steps below to be in the “HOT” range (ATF temperature: 50 80°C).
1. Warm up the engine and drive for approx. 10 minutes. (When ambient temperature is 20°C, the ATF
temperature usually increases to approx. 50 - 80°C with 10 minutes of driving).
2. Park the vehicle on the level ground.
3. Securely apply the parking brake.
4. At engine idle, select the lever from P to 1 while stepping on the brake pedal.
5. Check if the ATF level is at fluid level gauge’s HOT range in P or N position.
CAUTION:
When it is needed to inspect the ATF level at low ATF temperature (30 - 50°C) or changing ATF,
adjust the fluid level to the COLD level first and check again the ATF level to be the HOT range.
Use a paper towel when wiping out the ATF from the fluid level gauge.
Securely fasten the fluid level gauge to the charging pipe with a stopper.
CONDITION
Inspect the ATF condition
ATF Condition Possible Cause Required Operation
Varnishing
(It becomes
tacky as
varnish)
Milky white or
dark while
Metal particles
much mixed
The clutch and band are
burning
Water mixed
The moving parts of the A/T
is wearing out too much
Change the ATF and
inspect for any defects in
A/T assembly or vehicle
(such as harness wire and
cooler pipe)
Change ATF and inspect
for any water inflow
Change ATF and inspect
for any A/T bad operation
STALL TEST
Test Procedure
1. Inspect the engine oil level. Add if necessary.
2. After approx. 10 minutes of driving, warm up the engine until ATF reaches 50 - 80°C. Add ATF if necessary.
CAUTION:
When ambient temperature is 20°C, the ATF temperature
usually increases to approx. 50 - 80°C with 10 minutes
of driving.
AT-25
Page 26
TROUBLE DIAGNOSIS
3. Securely apply the parking brake and block the wheel rotation.
4. Start the engine and place the selector lever to D while depressing the brake pedal.
5. Slowly depress the accelerator pedal while depressing the
brake pedal.
6. Read stall RPM quickly and then release the accelerator pedal
immediately.
CAUTION:
Do not depress the accelerator pedal for more than 5 sec-
onds during the test.
7. Move the selector lever to N.
8. Cool off the ATF.
CAUTION:
Idle the engine for at least 1 minute.
Standard value: 2,300 - 2,700 RPM
AT- 26
Page 27
TROUBLE DIAGNOSIS
Defective Section
Selector Lever Position
D
H
O
L
Stall test
H
O
O: Less than standard stall RPM. H: Stall RPM is higher than standard value. L: Stall RPM is lower than standard value.
1
H
O
L
H
O
2
H
O
L
H
O
R
Forward clutch
Forward one-way clutch
O
Low one-way clutch
Low reverse brake
H
Reverse clutch
Torque converter one-way clutch
L
Line pressure route (low line pressure) and [forward clutch, low one-
way clutch, forward one-way clutch]
Line pressure route (low line pressure) and [reverse switch, forward
H
O
clutch]
[Forward clutch, low one-way clutch, forward one-way clutch] and
[reverse clutch, forward clutch]
Line pressure route (low line pressure), [forward clutch, low one-way
clutch, forward one-way clutch] and [reverse clutch, forward clutch]
Clutches and brakes are normal except for high clutch, brake band
and overrun clutch (However, the state of high clutch, brake band
and overrun clutch cannot be determined by the stall test)
Possible Trouble Cause
Line Pressure Test
LINE PRESSURE DETECTING PORT
Test Procedure
1. Inspect the engine oil level. Add if necessary.
2. After approx. 10 minutes of driving, warm up the engine until
ATF reaches 50 - 80°C. Add ATF if necessary.
CAUTION:
When ambient temperature is 20°C, the ATF temperature
usually increases to approx. 50 - 80°C with 10 minutes
of driving.
A
SAT867K
3. After warming up the A/T, remove the fluid pressure detection plug (A: ST25480000).
4. Install the oil pressure gauge (A: ST2505S001).
A
SAT868K
AT-27
Page 28
TROUBLE DIAGNOSIS
4. Securely apply the parking brake and block the wheel rotation.
5. Start the engine and measure the line pressure during idling
and stall test.
CAUTION:
Securely depress the brake pedal during measurement.
Refer to “Stall Test” (AT-25) when measuring the line
pressure during stall test.
6. After the measurement, install the fluid pressure detection
plug and tighten to the specified torque.
Tightening torque: 5.0 - 6.8 N•m (0.5 - 0.7 kgf-m)
LINE PRESSURE STANDARD VALUE
Engine Speed
While idling
While stall test
Drive Type
Front wheel drive
Front wheel drive
Engine Model
CAUTION:
Do not reuse the detection plug.
Line Pressure (MPa {kgf/cm2})
R range
0.78 {7.9}
1.74 {17.8}
1.81 {18.5}
QG15DE
QG15DE
Model No.
3AX65
3AX65
D, 2, 1 range
0.50 {5.1}
1.12 {11.4}
1.17 {11.9}
AT- 28
Page 29
Trouble Location
Results Possible Troubles
Low in all ranges
(P, R, D, 2, 1)
During
idling
During stall
test
Low in a
certain range
High
Fluid pressure
does not increase
more than at idle
Pressure increases
but not in standard
value
Low in a
certain range
TROUBLE DIAGNOSIS
It is presumed to have defect in pressure supply system and low output of oil pump.
For example:
Worn oil pump
Sticks in pressure regulator valve or plug, or worn spring
Fluid pressure leakage in the oil strainer → oil pump → pressure regulator valve
circuit
Low engine idle RPM
It is presumed to be the fluid pressure leakage in a certain range system and circuit
after the pressure has supplied from the manual valve. The line pressure is low in R
and 1 range when leakage is at low reverse brake system but the P, N, D, 3 and 2
ranges are normal.
It is presumed to have defective sensors and defective pressure regulating function.
For example:
Defective throttle position sensor
Defective fluid pressure sensor
Bad operation of line pressure solenoid (stuck in OFF state, filter loading and
open circuit)
Pressure modifier valve stick
Pressure regulator valve and plug stick
It is presumed to have defective sensors and defective pressure regulating function.
For example:
Defective slot sensor
Defective A/T control unit
Bad operation of line pressure solenoid (stuck in ON state, short circuit)
Pressure regulator valve and plug stick
Pressure modifier valve stick
Pilot valve stick and pilot filter loading
It is presumed to have defectives common pressure system and sensors and
defective pressure regulating function.
For example:
Defective slot sensor
Bad operation of line pressure solenoid (stuck, filter loading)
Pressure regulator valve and plug stick
Pressure modifier valve stick and worn spring
Pilot valve stick and pilot filter loading
It is presumed to be the fluid pressure leakage in a certain range system and circuit
after the pressure has supplied from the manual valve. The line pressure is low in R
and 1 range when leakage is at low reverse brake system but the P, N, D, 3 and 2
ranges are normal.
ROAD TEST
General
Inspect the A/T performance in general through road test and
analyze the trouble cause.
Perform the road test in 3 stages as below.
1. Inspection before engine start (Refer to “Inspection Before
Engine Start” (AT-30)).
2. Inspection during idle (Refer to “Inspection During Idle” (AT-30)).
3. Road test.
Inspect all items from part 1 to part 3.
AT-29
Page 30
TROUBLE DIAGNOSIS
(Refer to “Road Test Part 1” (AT-32), “Road Test Part 2” (AT-34) and “Road Test Part 3” (AT-36)).
Before road test, make sure of the test procedure and items.
Test all inspection items until the symptom is found. Perform the NG items again after completion of
road test.
Inspection before Engine Start
1. A/T CHECK INDICATOR LIGHT
1. Park the vehicle on the level ground.
2. Select P range.
3. Wait approx. 5 seconds after turning the key switch OFF.
4. Turn the key switch “ON”. (Do not start the engine.)
Does the A/T CHECK indicator light on for approx. 2 seconds?
YES → Go to No. 2.
NO → Stop the road test and go to “A/T CHECK Indicator Light does not Come On” (AT-84).
2. A/T CHECK INDICATOR LIGHT
Does the A/T CHECK indicator light turn on for approx. 8 seconds?
YES → Perform the self-diagnosis and record the NG items on the diagnosis sheet. (Refer to
“Self-Diagnosis” (Without Using CONSULT-II) (AT-53))
NO → 1. Turn the key switch “OFF”.
2. Perform the self-diagnosis and record the NG items on the diagnosis sheet. (Refer to
“Self-Diagnosis” (Without Using CONSULT-II) (AT-53))
3. Go to “Inspection During Idle” (AT-30).
Inspection During Idle
1. ENGINE STARTING
1. Park the vehicle on the level ground.
2. Select P range.
3. Turn the key switch OFF.
4. Turn the key switch START.
Does the engine start?
YES → Go to No. 2.
NO → Stop the road test and go to “Engine does not Start in P and N” (AT-85).
AT- 30
Page 31
TROUBLE DIAGNOSIS
2. ENGINE STARTING
1. Place the key switch to ACC.
2. Select R range for D, 1 and 2.
3. Turn the key switch “START”.
Does the engine start at all ranges?
YES → Stop the road test and go to “Engine does not Start in P and N” (AT-85).
NO → Go to No. 3.
3. P RANGE FUNCTION
1. Select P range.
2. Turn the key switch OFF.
3. Release the parking brake.
4. Push the vehicle forward or backward.
5. Apply the parking brake.
Does the vehicle move when pushed?
YES → Mark on the “Vehicle moves in P range when pushed” in the diagnosis sheet and continue
the road test.
NO → Go to No. 4.
4. N RANGE FUNCTION
1. Start the engine.
2. Select N range.
3. Release the parking brake.
Does the vehicle move?
YES → Mark on the “Vehicle moves in N range” in the diagnosis sheet and continue the road test.
NO → Go to No. 5.
5. SHIFT SHOCK
1. Apply the parking brake.
2. Select R range.
Is there great shock when shifting from N to R?
YES → Mark on the “Too much shift shock when shifting from N range to R range” in the diagnosis
sheet and continue the road test.
NO → Go to No. 6.
6. R RANGE FUNCTION
Release the brake for approx. 4 - 5 seconds.
Does the vehicle go reverse?
YES → Go to No. 7.
NO → Mark on the “Cannot reverse in R range” in the diagnosis sheet and continue the road test.
AT-31
Page 32
TROUBLE DIAGNOSIS
7. D, 3, 2, 1 RANGE FUNCTION
Inspect if the vehicle goes forward at D, 3, 2, 1 range.
Does the vehicle go forward at D, 3, 2, 1 range?
YES → Go to Road test Part 1
NO → Mark on the “Cannot go forward in D, 3, 2, 1 range” in the diagnosis sheet and continue
the road test.
(AT-32), Part 2 (AT-34)and Part 3 (AT-36).
Road Test Part 1
ROAD TEST PART 1
1. DRIVING OFF AT D1
1. Drive for approx. 10 minutes to raise the engine oil and ATF temperature to the operating temperature.
Proper ATF temperature: 50 - 80°C
2. Park the vehicle on the level ground.
3. Select P range.
4. Start the engine.
5. Select D range.
6. Press the accelerator pedal halfway to accelerate.
When using CONSULT-II
Read the gear position.
Does it start from “D1”?
YES → Go to No. 2.
NO → Mark on the “Does not start from D1” in the diagnosis sheet and continue the road test.
2. SHIFT UP D1 TO D2
Press the accelerator pedal halfway and inspect if shifts up (D1 to D2) in proper speed.
Refer to “Shifting Speed” (AT-38).
When using CONSULT-II
Check the gear position, throttle opening and vehicle speed.
Does it shift up from D1 to D2 with proper speed?
YES → Go to No. 3.
NO → Mark on the “No shift from D1 to D2” or “No kickdown from D4 to D2” in the diagnosis
sheet and continue the road test.
AT- 32
Page 33
TROUBLE DIAGNOSIS
3. SHIFT UP D2 TO D3
Press the accelerator pedal halfway and inspect if shifts up (D2 to D3) in proper speed.
Refer to “Shifting Speed” (AT-38).
When using CONSULT-II
Check the gear position, throttle opening and vehicle speed.
Does it shift up from D2 to D3 with proper speed?
YES → Go to No. 4.
NO → Mark on the “No shift from D2 to D3” in the diagnosis sheet and continue the road test.
4. SHIFT UP D3 TO D4
Press the accelerator pedal halfway and inspect if shifts up (D3 to D4) in proper speed.
Refer to “Shifting Speed” (AT-38).
When using CONSULT-II
Check the gear position, throttle opening and vehicle speed.
Does it shift up from D3 to D4 with proper speed?
YES → Go to No. 5.
NO → Mark on the “No shift from D3 to D4” in the diagnosis sheet and continue the road test.
5. LOCKUP
Press the accelerator pedal halfway and inspect if shifts up (D4 to D4 lockup) in proper speed.
Refer to “Shifting Speed” (AT-38).
When using CONSULT-II
Check the throttle opening and vehicle speed when the lockup duty is 94 %.
Does it lock up with proper speed?
YES → Go to No. 6.
NO →
6. MAINTAINING LOCKUP STATE
Does the lockup state continue for more than 30 seconds?
YES → Go to No. 7.
NO → Mark on the “Lockup is not continued” in the diagnosis sheet and continue the road test.
AT-33
Page 34
TROUBLE DIAGNOSIS
7. LOCKUP RELEASE
Release the accelerator pedal.
Does the lockup release by releasing the accelerator pedal?
YES → Go to No. 8.
NO → Mark on the “Lockup does not release” in the di-
agnosis sheet and continue the road test.
8. SHIFT DOWN D4 TO D3
Decelerate by lightly depressing the brake pedal.
When using CONSULT-II
Check the gear position and engine speed.
Does the engine speed drop smoothly to the idle RPM when
shifted down from D4 to D3?
YES → 1. Park the vehicle.
2. Go to “Road Test 2” (AT-34).
NO → Mark on the “Engine speed does not drop to idle
RPM” in the diagnosis sheet and continue the road
test.
Road Test Part 2
ROAD TEST PART 2
1. DRIVING OFF AT D1
1. Select “D” range.
2. Press the accelerator pedal halfway to accelerate.
When using CONSULT-II
Read the gear position.
Does it start from D1?
YES → Go to No. 2.
NO → Mark on the “Does not start from D1” in the diag-
nosis sheet and continue the road test.
AT- 34
Page 35
TROUBLE DIAGNOSIS
2. SHIFT UP D3 TO D4 AND SHIFT DOWN D4 TO D3
1. Accelerate up to 80 km/h.
2. Release the foot from the accelerator pedal and then
quickly press the pedal.
When using CONSULT-II
Check the gear position and throttle position.
Does it shift down from D4 to D2 immediately when depress
the accelerator pedal?
YES → Go to No. 3.
NO → Mark on the “No shift from D1 to D2” or “No
kickdown from D4 to D2” in the diagnosis sheet
and continue the road test.
3. SHIFT UP D2 TO D3
Press the accelerator pedal fully and inspect if shifts up (D2
to D3) in proper speed.
Refer to “Shifting Speed” (AT-38).
When using CONSULT-II
Check the gear position, throttle opening and vehicle speed.
Does it shift up with proper speed?
YES → Go to No. 4.
NO → Mark on the “No shift from D2 to D3” in the diag-
nosis sheet and continue the road test.
4. SHIFT UP D3 TO D4 AND ENGINE BRAKE
Release the accelerator pedal when shifted from D2 to D3.
Does the engine brake work after shifting up from D3 to D4?
YES → 1. Park the vehicle.
2. Go to “Road Test Part 3” (AT-36).
NO → Mark on the “No shift from D3 to D4” in the diag-
nosis sheet and continue the road test.
AT-35
Page 36
TROUBLE DIAGNOSIS
Road Test Part 3
ROAD TEST PART 3
1. SHIFT DOWN D4 TO D3
1. Select D range.
2. Accelerate up to D4 with half-throttle.
3. Release the accelerator pedal.
4. Switch the shift lever to “3” range while driving in D4.
When using CONSULT-II
Check the gear position and vehicle speed.
Does it shift down from D4 to D3?
YES → Go to No. 3.
NO → Mark on the “No shift from D4 to D3 when shift lever is moved from D to 3” in the diagno-
sis sheet and continue the road test.
2. ENGINE BRAKE
Does the vehicle decelerate due to engine brake?
YES → Go to No. 4.
NO → Mark on the “Engine speed does not drop to idle RPM” in the diagnosis sheet and continue
the road test.
3. SHIFT DOWN D3 TO 2
Move the selector from 3 to 2 while driving in D3 (“3” range).
When using CONSULT-II
Check the gear position.
Does it shift down from D3 to 2 ?
YES → Go to No. 5.
NO → Mark on the “No shift from D3 to 22 when selector lever is moved from 3 to 2” in the
diagnosis sheet and continue the road test.
2
2
4. ENGINE BRAKE
Does the vehicle decelerate due to engine brake?
YES → Go to No. 6.
NO → Put a checkmark at “The engine RPM does not drop to idle” in diagnosis sheet and con-
tinue the road test.
AT- 36
Page 37
TROUBLE DIAGNOSIS
5. SHIFT DOWN 2
Select 1 while driving in 22.
When using CONSULT-II
Check the gear position.
Does it shift down from 2 to 1 ?
YES → Go to No. 7.
NO → Mark on the “No shift from 22 to 11 when selector lever is moved from 2 to 1” in the diag-
nosis sheet and continue the road test.
TO 1
2
1
21
6. ENGINE BRAKE
Does the vehicle decelerate due to engine brake?
YES → 1. Stop the vehicle.
2. Perform the self-diagnosis. Refer to “Self-Diagnosis” (Without Using CONSULT-II) (AT-
53).
NO → Mark on the “No engine brake” in the diagnosis sheet and continue the road test.
AT-37
Page 38
Shifting Speed
Engine Model
Model No.
Throttle opening
(Accelerator opening)
Throttle opening
(Accelerator opening 8/8)
Throttle opening
(Accelerator opening 4/8)
Lockup Speed
“D1” to “D2”
50 - 58
25 - 33
TROUBLE DIAGNOSIS
QG16DE
3AX65
Vehicle speed (km/h)
“D2” to “D3”
100 - 108
51 - 59
“D3” to “D4”
162 - 170
122 - 130
“D4” to “D3”
158 - 166
70 - 78
“D3” to “D2”
92 - 100
40 - 48
“D2” to “D1”
41 - 49
5 - 13
Drive type
Engine model
Model No.
Vehicle speed
when engaging (km/h)
Vehicle speed
when releasing (km/h)
At closed throttle
At half-throttle
At closed throttle
At half-throttle
Front wheel drive
QG16DE
3AX65
48 - 56
141 - 149
45 - 53
109 - 117
The lockup speed is in D4 position.
The closed throttle is that the idle switch is OFF when accelerator opening is less than 1/8.
When the accelerator opening is 4/8, it will be half-throttle.
AT- 38
Page 39
TROUBLE DIAGNOSIS
Trouble Diagnosis by Symptoms
The number in the diagnostic item column means inspection order. Inspect in order from the No. 1.
Symptom Conditions Diagnostic Item
Bad starting in N or P range
Engine starts other than N or P range
Transaxle noise in P or N range
Parking is not available in P range
Parking condition is not released in
other ranges
Drives in N range
Driving in R range
(D, 3, 2, 1 range driving is possible)
Clutch Slip
Very bad acceleration
Braking occurs in R range
On-vehicle
condition
On-vehicle
condition
On-vehicle
condition
Unit assembly
On-vehicle
condition
Unit assembly
On-vehicle
condition
Unit assembly
On-vehicle
condition
Unit assembly
On-vehicle
condition
Unit assembly
1. Key switch and starter
2. Control cable adjustment
3. Inhibitor switch adjustment
1. Control cable adjustment
2. Inhibitor switch adjustment
1. ATF level
2. Line pressure inspection
3. Throttle position sensor adjustment
4. Vehicle speed sensor 1 and 2
5. Engine revolution signal
6. Oil pump
7. Torque converter
1. Control cable adjustment
2. Parking components
1. Control cable adjustment
2. Forward clutch
3. Reverse clutch
4. Overrun clutch
1. Control cable adjustment
2. Line pressure inspection
3. Line pressure solenoid
4. Control valve assembly
5. Reverse clutch
6. High clutch
7. Forward clutch
8. Overrun clutch
9. Low and reverse clutch
1. ATF level and condition
2. Control cable adjustment
3. Line pressure test
4. Line pressure solenoid
5. Control valve assembly
6. High clutch
7. Brake clutch
8. Forward clutch
9. Overrun clutch
Ref. Page
-
(AT-120)
(AT-123)
(AT-120)
(AT-123)
(AT-7)
(AT-27)
(EC-76)
(EC-114)
(AT-55)
(AT-57)
(AT-74)
(AT-131)
(AT-131)
(AT-120)
(AT-133)
(AT-120)
(AT-132)
(AT-132)
(AT-132)
(AT-120)
(AT-27)
(AT-76)
(AT-121)
(AT-132)
(AT-132)
(AT-132)
(AT-132)
(AT-132)
(AT-7)
(AT-120)
(AT-27)
(AT-76)
(AT-121)
(AT-132)
(AT-132)
(AT-132)
(AT-132)
AT-39
Page 40
TROUBLE DIAGNOSIS
Symptom Conditions Diagnostic Item
Too much shock (N → D)
Cannot drive in D, 2 range
(OK in 1, R rage)
Cannot drive in D, 3, 2, 1 range
(OK in R range)
Clutch Slip
Very bad acceleration
Clutch and brake slips while drive off
Excessive creep
No creep
On-vehicle
condition
Unit assembly
On-vehicle
condition
Unit assembly
On-vehicle
condition
Unit assembly
On-vehicle
condition
Unit assembly
On-vehicle
condition
On-vehicle
condition
Unit assembly
1. Engine idle RPM
2. Throttle position sensor adjustment
3. Line pressure test
4. Fluid temperature sensor
5. Engine revolution signal
6. Line pressure solenoid
7. Control valve
8. Accumulator N-D
9. Forward clutch
1. Control cable adjustment
2. Low one-way clutch
1. ATF level and condition
2. Line pressure test
3. Line pressure solenoid
4. Control valve assembly
5. Accumulator N-D
6. Reverse clutch
7. High clutch
8. Forward clutch
9. Forward one-way
10. Low one-way clutch
1. ATF level and condition
2. Control cable and adjustment
3. Throttle position sensor adjustment
4. Line pressure test
5. Line pressure solenoid
6. Control valve assembly
7. Accumulator N-D
8. Forward clutch
9. Reverse clutch
10. Low reverse brake
11. Oil pump
12. Torque converter
Engine idle RPM
1. ATF level and condition
2. Line pressure test
3. Control valve assembly
4. Forward clutch
5. Oil pump
6. Torque converter
Ref. Page
(EC-11)
(EC-11)
(EC-114)
(AT-27)
(AT-71)
(AT-74)
(AT-76)
(AT-121)
(AT-121)
(AT-132)
(AT-120)
(AT-132)
(AT-7)
(AT-27)
(AT-76)
(AT-121)
(AT-121)
(AT-132)
(AT-132)
(AT-132)
(AT-132)
(AT-132)
(AT-25)
(AT-120)
(EC-76)
(EC-114)
(AT-27)
(AT-76)
(AT-121)
(AT-121)
(AT-132)
(AT-132)
(AT-132)
(AT-131)
(AT-131)
(EC-11)
(AT-25)
(AT-27)
(AT-121)
(AT-132)
(AT-131)
(AT-131)
AT- 40
Page 41
TROUBLE DIAGNOSIS
Symptom Conditions Diagnostic Item
D1 → D2 bad shifting
D2 → D3 bad shifting
D3 → D4 bad shifting
High shifting points during D1 → D2,
D2 → D3, D3 → D4 shifts
Directly shifts from D1 to D3
Engine stalls in R, D, 3, 2, 1 range
Too much shock in D1 → D2 shift
On-vehicle
condition
Unit assembly
On-vehicle
condition
Unit assembly
On-vehicle
condition
Unit assembly
On-vehicle
condition
On-vehicle
condition
Unit assembly
On-vehicle
condition
Unit assembly
On-vehicle
condition
Unit assembly
1. Inhibitor switch
2. Control cable adjustment
3. Shift solenoid valve A
4. Control valve assembly
5. Vehicle speed sensor 1 and 2
6. Brake band
1. Inhibitor switch
2. Control cable adjustment
3. Shift solenoid valve B
4. Control valve assembly
5. Vehicle speed sensor 1 and 2
6. High clutch
7. Brake band
1. Inhibitor switch
2. Control cable adjustment
3. Shift solenoid valve A
4. Vehicle speed sensor 1 and 2
5. Fluid temperature sensor
6. Brake band
1. Throttle position sensor adjustment
2. Vehicle speed sensor 1 and 2
3. Shift solenoid valve A
4. Shift solenoid valve B
1. ATF level and condition
2. Accumulator S/R
3. Brake band
1. Engine idle RPM
2. Lockup solenoid valve
3. Control valve
4. Torque converter
1. Throttle position sensor adjustment
2. Line pressure test
3. Accumulator S/R
4. Control valve assembly
5. Fluid temperature sensor
6. Brake band
Ref. Page
(AT-123)
(AT-120)
(AT-63)
(AT-121)
(AT-55)
(AT-57)
(AT-132)
(AT-123)
(AT-120)
(AT-65)
(AT-121)
(AT-55)
(AT-57)
(AT-132)
(AT-132)
(AT-123)
(AT-120)
(AT-63)
(AT-55)
(AT-57)
(AT-71)
(AT-132)
(EC-73)
(EC-114)
(AT-55)
(AT-57)
(AT-63)
(AT-65)
(AT-25)
(AT-121)
(AT-132)
(EC-11)
(AT-69)
(AT-121)
(AT-131)
(EC-73)
(EC-114)
(AT-27)
(AT-121)
(AT-121)
(AT-71)
(AT-132)
AT-41
Page 42
TROUBLE DIAGNOSIS
Symptom Conditions Diagnostic Item
Too much shock in D2 → D3 shift
Too much shock in D3 → D4 shift
No shocks in D1 → D2 shift or clutch
slips
No shocks or slips in D2 → D3 shift
No shocks or slips in D3 → D4 shift
Braking occurs during D1 → D2 shift
Braking occurs during D2 → D3 shift
Braking occurs during D3 → D4 shift
On-vehicle
condition
Unit assembly
On-vehicle
condition
Unit assembly
On-vehicle
condition
Unit assembly
On-vehicle
condition
Unit assembly
On-vehicle
condition
Unit assembly
On-vehicle
condition
Unit assembly
On-vehicle
condition
Unit assembly
On-vehicle
condition
Unit assembly
1. Throttle position sensor adjustment
2. Line pressure test
3. Control valve assembly
4. High clutch
5. Brake band
1. Throttle position sensor adjustment
2. Line pressure test
3. Control valve assembly
4. Brake band
5. Overrun clutch
1. ATF level and condition
2. Throttle position sensor adjustment
3. Line pressure test
4. Accumulator S/R
5. Control valve assembly
6. Brake band
1. ATF level and condition
2. Throttle position sensor adjustment
3. Line pressure test
4. Control valve assembly
5. High clutch
6. Brake band
1. ATF level and condition
2. Throttle position sensor adjustment
3. Line pressure test
4. Control valve assembly
5. High clutch
6. Brake band
1. ATF level and condition
2. Reverse clutch
3. Low and reverse clutch
4. High clutch
5. Low one-way clutch
1. ATF level and condition
2. Brake band
1. ATF level and condition
2. Overrun clutch
3. Low one-way clutch
4. Reverse clutch
Ref. Page
(EC-73),
(EC-114)
(AT-27)
(AT-121)
(AT-132)
(AT-132)
(EC-73),
(EC-114)
(AT-27)
(AT-121)
(AT-132)
(AT-132)
(AT-25)
(EC-73),
(EC-114)
(AT-27)
(AT-121)
(AT-121)
(AT-132)
(AT-25)
(EC-73),
(EC-114)
(AT-27)
(AT-121)
(AT-132)
(AT-132)
(AT-25)
(EC-73),
(EC-114)
(AT-27)
(AT-121)
(AT-132)
(AT-132)
(AT-25)
(AT-132)
(AT-132)
(AT-132)
(AT-132)
(AT-25)
(AT-132)
(AT-25)
(AT-132)
(AT-132)
(AT-132)
AT- 42
Page 43
TROUBLE DIAGNOSIS
Symptom Conditions Diagnostic Item
Low max. speed
Bad acceleration
D4 → D3 bad shifting
D3 → D2 or D4 → D2 bad shifting
D2 → D1 or D3 → D1 bad shifting
Shifting shocks during deceleration
when accelerator pedal is released
High shifting points during D4 → D3,
D3 → D2, D2 → D1 shifts
On-vehicle
condition
Unit assembly
On-vehicle
condition
Unit assembly
On-vehicle
condition
Unit assembly
On-vehicle
condition
Unit assembly
On-vehicle
condition
On-vehicle
condition
1. ATF level and condition
2. Inhibitor adjustment
3. Shift solenoid A
4. Shift solenoid B
5. Control valve
6. Reverse clutch
7. High clutch
8. Brake band
9. Low and reverse brake
10. Oil pump
11. Torque converter
1. ATF level and condition
2. Throttle position sensor adjustment
3. Overrun clutch solenoid valve
4. Shift solenoid A
5. Line pressure solenoid
6. Control valve assembly
7. Low and reverse brake
8. Overrun clutch
1. ATF level and condition
2. Throttle position sensor adjustment
3. Shift solenoid A
4. Shift solenoid B
5. Control valve assembly
6. High clutch
7. Brake band
1. ATF level and condition
2. Throttle position sensor adjustment
3. Shift solenoid A
4. Shift solenoid B
5. Control valve assembly
6. Low one-way clutch
7. High clutch
8. Brake band
1. Throttle position sensor adjustment
2. Line pressure test
3. Overrun clutch solenoid valve
4. Control valve assembly
1. Throttle position sensor adjustment
2. Vehicle speed sensor 1 and 2
Ref. Page
(AT-25)
(AT-123)
(AT-63)
(AT-65)
(AT-121)
(AT-132)
(AT-132)
(AT-132)
(AT-132)
(AT-131)
(AT-131)
(AT-25)
(EC-73),
(EC-114)
(AT-67)
(AT-63)
(AT-76)
(AT-121)
(AT-132)
(AT-132)
(AT-25)
(EC-73),
(EC-114)
(AT-63)
(AT-65)
(AT-121)
(AT-132)
(AT-132)
(AT-25)
(EC-73),
(EC-114)
(AT-63)
(AT-65)
(AT-121)
(AT-132)
(AT-132)
(AT-132)
(EC-73),
(EC-114)
(AT-27)
(AT-67)
(AT-121)
(EC-73),
(EC-114)
(AT-55),
(AT-57)
AT-43
Page 44
TROUBLE DIAGNOSIS
Symptom Conditions Diagnostic Item
Kickdown does not occur on the
kickdown range in D4 when accelerator
pedal is depressed
Kickdown occurs or engine overruns
under out of kickdown range in D4
when accelerator pedal is depressed
D4 → D3 shift is too fast or slips when
shifted by depressing accelerator pedal
D4 → D2 shift is too fast or slips when
shifted by depressing accelerator pedal
D3 → D2 shift is too fast or slips when
shifted by depressing accelerator pedal
On-vehicle
condition
On-vehicle
condition
On-vehicle
condition
Unit assembly
On-vehicle
condition
Unit assembly
On-vehicle
condition
Unit assembly
1. Throttle position sensor adjustment
2. Vehicle speed sensor 1 and 2
3. Shift solenoid A
4. Shift solenoid B
1. Vehicle speed sensor 1 and 2
2. Throttle position sensor adjustment
3. Shift solenoid A
4. Shift solenoid B
1. ATF level and condition
2. Throttle position sensor adjustment
3. Line pressure test
4. Line pressure solenoid valve
5. Control valve assembly
6. High clutch
7. Forward clutch
1. ATF level and condition
2. Throttle position sensor adjustment
3. Line pressure test
4. Line pressure solenoid valve
5. Shift solenoid valve A
6. Control valve assembly
7. Brake valve
8. Forward clutch
1. ATF level and condition
2. Throttle position sensor adjustment
3. Line pressure test
4. Line pressure solenoid valve
5. Control valve assembly
6. Fluid temperature sensor
7. Brake band
8. Forward clutch
9. High clutch
Ref. Page
(EC-73),
(EC-114)
(AT-55),
(AT-57)
(AT-63)
(AT-65)
(AT-55),
(AT-57)
(EC-73),
(EC-114)
(AT-63)
(AT-65)
(AT-25)
(EC-73),
(EC-114)
(AT-27)
(AT-76)
(AT-121)
(AT-132)
(AT-132)
(AT-25)
(EC-73),
(EC-114)
(AT-27)
(AT-76)
(AT-63)
(AT-121)
(AT-132)
(AT-132)
(AT-25)
(EC-73),
(EC-114)
(AT-27)
(AT-76)
(AT-121)
(AT-71)
(AT-132)
(AT-132)
(AT-132)
AT- 44
Page 45
TROUBLE DIAGNOSIS
Symptom Conditions Diagnostic Item
D4 → D1 or D3 → D1 shift is too fast
or slips when shifted by depressing
accelerator pedal
Cannot drive in all ranges
Transaxle noise in D, 3, 2, 1, R range
D3 → 2
2 shift is bad when shifted into
2 range
2 → 33 shift occurs in 2 range
2
Bad engine brake in 1 range
1 → 22 shift occurs in 1 range
1
On-vehicle
condition
Unit assembly
On-vehicle
condition
Unit assembly
On-vehicle
condition
Unit assembly
On-vehicle
condition
Unit assembly
On-vehicle
condition
On-vehicle
condition
Unit assembly
On-vehicle
condition
1. ATF level and condition
2. Throttle position sensor adjustment
3. Line pressure test
4. Line pressure solenoid valve
5. Control valve assembly
6. Forward clutch
7. Forward one-way clutch
8. Low one-way clutch
1. ATF level and condition
2. Control cable adjustment
3. Line pressure test
4. Line pressure solenoid valve
5. Oil pump
6. High clutch
7. Brake band
8. Low and reverse brake
9. Torque converter
10. Parking linkage
1. ATF level and condition
2. Torque converter
1. Inhibitor switch adjustment
2. Throttle position sensor adjustment
3. Overrun clutch solenoid valve
4. Shift solenoid A
5. Shift solenoid B
6. Control valve assembly
7. Control cable adjustment
8. Brake band
9. Overrun clutch
1. Inhibitor switch adjustment
1. Inhibitor switch adjustment
2. Control cable adjustment
3. Throttle position sensor adjustment
4. Vehicle speed sensor 1 and 2
5. Shift solenoid A
6. Control valve assembly
7. Overrun clutch solenoid valve
8. Overrun clutch
9. Low and reverse brake
1. Inhibitor switch adjustment
2. Control cable adjustment
Ref. Page
(AT-25)
(EC-73),
(EC-114)
(AT-27)
(AT-76)
(AT-121)
(AT-132)
(AT-132)
(AT-132)
(AT-25)
(AT-120)
(AT-27)
(AT-76)
(AT-131)
(AT-132)
(AT-132)
(AT-132)
(AT-131)
(AT-133)
(AT-25)
(AT-131)
(AT-123)
(EC-73),
(EC-114)
(AT-67)
(AT-63)
(AT-65)
(AT-121)
(AT-120)
(AT-132)
(AT-132)
(AT-123)
(AT-123)
(AT-120)
(EC-73),
(EC-114)
(AT-55),
(AT-57)
(AT-63)
(AT-121)
(AT-67)
(AT-132)
(AT-132)
(AT-123)
(AT-120)
AT-45
Page 46
TROUBLE DIAGNOSIS
Symptom Conditions Diagnostic Item
2 → 11 shift occurs in 1 range
1
Too much shift shock during 1
2 → 11
shift in 1 range
Transaxle overheating
ATF leaks during driving
White smoke from the exhaust pipe
Odor in the fluid charging pipe
On-vehicle
condition
Unit assembly
On-vehicle
condition
Unit assembly
On-vehicle
condition
Unit assembly
On-vehicle
condition
Unit assembly
On-vehicle
condition
Unit assembly
1. Inhibitor switch adjustment
2. Vehicle speed sensor 1 and 2
3. Shift solenoid A
4. Control valve assembly
5. Overrun clutch solenoid valve
6. Overrun clutch
7. Low reverse brake
1. Control valve assembly
2. Low reverse brake
1. ATF level and condition
2. Engine idle RPM
3. Throttle position sensor adjustment
4. Line pressure test
5. Line pressure solenoid valve
6. Control valve assembly
7. Oil pump
8. Reverse clutch
9. High clutch
10. Brake band
11. Forward clutch
12. Overrun clutch
13. Low and reverse brake
14. Torque converter
1. ATF level and condition
2. Reverse clutch
3. High clutch
4. Brake band
5. Forward clutch
6. Overrun clutch
7. Low and reverse brake
1. ATF level and condition
2. Torque converter
3. Oil pump
4. Reverse clutch
5. High clutch
6. Brake band
7. Forward clutch
8. Overrun clutch
9. Low and reverse brake
Ref. Page
(AT-123)
(AT-55),
(AT-57)
(AT-63)
(AT-121)
(AT-67)
(AT-132)
(AT-132)
(AT-121)
(AT-132)
(AT-25)
(EC-11)
(EC-73),
(EC-114)
(AT-27)
(AT-76)
(AT-121)
(AT-131)
(AT-132)
(AT-132)
(AT-132)
(AT-132)
(AT-132)
(AT-132)
(AT-131)
(AT-25)
(AT-132)
(AT-132)
(AT-132)
(AT-132)
(AT-132)
(AT-132)
(AT-25)
(AT-131)
(AT-131)
(AT-132)
(AT-132)
(AT-132)
(AT-132)
(AT-132)
(AT-132)
AT- 46
Page 47
TROUBLE DIAGNOSIS
Symptom Conditions Diagnostic Item
Bad lockup in the torque converter
Clutch piston slips in torque converter
Lockup point is too high or too low
A/T does not shift to D4 while driving
with shifting from “3” to “D”
Engine stalls in R, D, 3, 2, 1 range
On-vehicle
condition
Unit assembly
On-vehicle
condition
Unit assembly
On-vehicle
condition
On-vehicle
condition
Unit assembly
On-vehicle
condition
1. Throttle position sensor adjustment
2. Vehicle speed sensor 1 and 2
3. Inhibitor switch adjustment
4. Engine speed signal
5. Fluid temperature sensor
6. Line pressure test
7. Lockup solenoid valve
8. Control valve
9. Torque converter
1. ATF level and condition
2. Throttle position sensor adjustment
3. Line pressure test
4. Lockup solenoid valve
5. Line pressure solenoid valve
6. Control valve assembly
7. Torque converter
1. Throttle position sensor adjustment
2. Vehicle speed sensor 1 and 2
3. Lockup solenoid valve
4. Control valve assembly
1. Throttle position sensor adjustment
2. Inhibitor switch adjustment
3. Vehicle speed sensor 1 and 2
4. Shift solenoid valve A
5. Overrun clutch solenoid valve
6. Control valve assembly
7. Fluid temperature sensor
8. Line pressure test
9. Brake band
10. Overrun clutch
1. ATF level and condition
2. Lockup solenoid valve
3. Shift solenoid B
4. Shift solenoid A
5. Control valve assembly
Ref. Page
(EC-73),
(EC-114)
(AT-55),
(AT-57)
(AT-123)
(AT-74)
(AT-71)
(AT-27)
(AT-69)
(AT-121)
(AT-131)
(AT-25)
(EC-73),
(EC-114)
(AT-27)
(AT-69)
(AT-76)
(AT-121)
(AT-131)
(EC-73),
(EC-114)
(AT-55),
(AT-57)
(AT-69)
(AT-121)
(EC-73),
(EC-114)
(AT-123)
(AT-55),
(AT-57)
(AT-63)
(AT-67)
(AT-121)
(AT-71)
(AT-27)
(AT-132)
(AT-132)
(AT-25)
(AT-69)
(AT-65)
(AT-63)
(AT-121)
AT-47
Page 48
TROUBLE DIAGNOSIS
A/T Control Unit Input/Output Signal Standards
A/T CONTROL UNIT TERMINAL ARRANGEMENT
REFERENCE VALUE
Standard value by CONSULT-II
Item
THRTL POS SEN
FLUID TEMP SE
LINE PRES DTY
TCC S/V DUTY
Approx. 0.5 - 4.0 V
Approx. 1.5 - 0.5 V
29 % - 94 %
9 % - 94 %
STANDARD VALUE BY CIRCUIT TESTER
Terminal
No.
1
2
3
5
6
7
8
9
10
Line pressure solenoid
Line pressure solenoid
(Dropping resistor
information)
Lockup solenoid
Engine & A/T integrated
control signal DT1
Engine & A/T integrated
control signal DT2
Engine & A/T integrated
control signal DT3
Engine & A/T integrated
control signal DT5
Engine & A/T integrated
control signal DT4
Power
Item
Key
switch
ON
When
driving
Release the accelerator pedal after engine warming up
Fully depress the accelerator pedal after engine warming up
Release the accelerator pedal after engine warming up
Fully depress the accelerator pedal after engine warming up
With lockup
Without lockup
Value
Accelerator pedal fully closed - fully opened
Low line pressure - high line pressure
Released lockup - engaged lockup
Operation or Conditions
-
Turn the key switch ON
Turn the key switch OFF
Measurement
A/T fluid: Approx. 20 - 80°C
Standard Value
Approx. 1.5 - 3.0 V
Approx. 0 V
Approx. 4 - 14 V
Approx. 0 V
Approx. 8 - 15 V
Approx. 0 V
Power voltage
Approx. 0 V
AT- 48
Page 49
TROUBLE DIAGNOSIS
Terminal
No.
11
12
13
16
17
19
20
22
25
26
27
28
29
30
31
32
34
35
36
Item Standard Value
Shift solenoid A
Shift solenoid B
O/D OFF indicator light
Idle switch
Full switch
Power
Overrun clutch solenoid
O/D “OFF” switch
(A/T device)
Ground
Inhibitor 1 range switch
Inhibitor 2 range switch
Power (Backup)
Vehicle speed sensor 1
(Output shaft revolution sensor)
Self-diagnosis (RX) signal
Self-diagnosis (TX) signal
Sensor power
Inhibitor D range switch
Inhibitor R range switch
Inhibitor N, P range switch
Operation or Conditions
When solenoid A is operating (D1 or D4 driving)
When
driving
Key
switch
ON
Turn the key switch ON
Turn the key switch OFF
When
driving
Key
switch
ON
Turn the key switch ON
Turn the key switch OFF
When driving at 20 km/h, use the pulse frequency mea-
surement function of the CONSULT-II*
Caution: Always connect the diagnosis data link gauge at
*: This item cannot be measured by the circuit tester.
Turn the key switch ON
Turn the key switch OFF
Key
switch
ON
When solenoid A is not operating (D2 or D3 driving)
When solenoid B is operating (D1 or D2 driving)
When solenoid B is not operating (D3 or D4 driving)
O/D OFF indicator light: ON
O/D OFF indicator light: OFF
Release the accelerator pedal after engine
warming up
Depress the accelerator pedal after engine
warming up
Depress the accelerator pedal over one-half after
engine warming up
Release the accelerator pedal after engine
warming up
When the overrun clutch solenoid is operating
When the overrun clutch solenoid is not operating
When O/D is ON (Contact point: OFF)
When O/D is OFF (Contact point: ON)
-
Selector lever: 1 range
Selector lever: Other than 1 range
Selector lever: 2 range
Selector lever: Other than 2 range
the vehicle’s diagnosis connector
-
-
Selector lever: D range
Selector lever: Other than D range
Selector lever: R range
Selector lever: Other than R range
Selector lever: N, P range
Selector lever: Other than N, P range
Power voltage
Approx. 0 V
Power voltage
Approx. 0 V
Approx. 0 V
Power voltage
Power voltage
Approx. 0 V
Power voltage
Approx. 0 V
Power voltage
Approx. 0 V
Power voltage
Approx. 0 V
Power voltage
Approx. 0 V
Approx. 0 V
Power voltage
Approx. 0 V
Power voltage
Approx. 0 V
Power voltage
Power voltage
Approx. 150 Hz
-
-
Approx. 4.5 - 5.5 V
Approx. 0 V
Power voltage
Approx. 0 V
Power voltage
Approx. 0 V
Power voltage
Approx. 0 V
AT-49
Page 50
TROUBLE DIAGNOSIS
Terminal
No.
39
40
41
42
45
47
48
Item Standard Value
Engine revolution signal
Vehicle speed sensor 2
(Vehicle speed signal on the
meter)
Throttle position sensor signal
Sensor ground
Stop lamp switch
Fluid temperature sensor
Ground
Operation or Conditions
-
When moving the vehicle more than 1 m at 2 - 3 km/h
Depress the accelerator pedal after engine
warming up
Key
switch
ON
-
Depress the brake pedal
Release the brake pedal
When approx. 20°C
When approx. 80°C
-
Intermittently
changing
between approx. 0
- 4.5 V
The voltage
increases by
depressing the
pedal.
When fully
closed:
Approx. 0.5 V
When fully
opened:
Approx. 4.0 V
Approx. 0 V
Power voltage
Approx. 0 V
Approx. 1.5 V
Approx. 0.5 V
Approx. 0 V
CONSULT-II Function
GENERAL
CONSULT-II displays the solenoid’s operating timing, that is, the electrical shift timing and lockup timing.
Thus when there is a certain difference between the actual shift timing by gear shifting shock (or engine
RPM change) and the shift timing displayed on CONSULT-II, it is considered that the device components
(including the fluid pressure circuit) except the solenoid and sensor components are defective. In this
case, inspect the device components using proper trouble diagnosis procedures.
There is a difference between the gear shifting point (gear position) displayed by CONSULT-II and
shift patterns in the service manual. This is due to the following reasons.
There are some allowances in actual shifting patterns.
The shift pattern in the Service Manual shows the starting point of the gear shift but CONSULT-II
shows the gear position when the gear shift is completed.
The shift solenoid A and B display (ON and OFF) in CONSULT-II changes at gear shift starting point and
the gear position display changes when the control unit calculates that the gear shift has completed.
CAUTION:
“Function Check Support” can be selected from CONSULT-II’s diagnosis mode but normally not in
use.
SELF-DIAGNOSIS
Operation procedure
Refer to separate CONSULT-II operation manual for details.
1. Turn the key switch OFF.
2. Connect the CONSULT-II connector to the vehicle’s diagnosis connector.
3. Start the engine.
4. Select “START (X-BADGE VHCL)”, “A/T” and “SELF-DIAG RESULTS” in order from CONSULT-II.
5. The self-diagnosis result is displayed.
AT- 50
Page 51
DISPLAY LIST
CAN COMM CIRCUIT
VHCL SPEED SEN • A/T
VHCL SPEED SEN • MTR
THROTTLE POSI SEN
SHIFT SOLENOID/V A
SHIFT SOLENOID/V B
OVERRUN CLUTCH S/V
T/C CLUTCH SOL/V
LINE PRESSURE S/V
BATT/FLUID TEMP SEN
ENGINE SPEED SIG
INITIAL START
CONTROL UNIT (RAM)
CONTROL UNIT (ROM)
TROUBLE DIAGNOSIS
When malfunction is detected in CAN communication line
When vehicle speed sensor 1 signal is not
inputted due to open circuit
When abnormal signal is inputted while
driving
When abnormal signal is inputted from
vehicle speed sensor 2 until drive off after
key switch turned ON
When vehicle speed sensor 2 signal is not
inputted due to open circuit
When abnormal signal is inputted while
driving
When the throttle position sensor signal
voltage is abnormally high
When the throttle position sensor signal
voltage while idle switch OFF or wheel
switch ON is abnormally low
When regular voltage is not present at the
solenoid due to open or short circuit
When the supply voltage to the control unit is
abnormally low while driving
When the fluid temperature signal voltage is
abnormally high while driving (The ATF
temperature is abnormally low)
Caution:There are no functions that can
memorize the defect during key
switch ON
When the engine speed is abnormally low
while driving
When the function such as self-diagnosis
memory is stopped when power is not
supplied to the control unit due to battery
removal
When defect is detected in the control unit’s
memory (RAM)
When defect is detected in the control unit’s
memory (ROM)
Check Point When DefectiveDefective Item Failure Detecting Conditions
Refer to LAN Section
Vehicle speed sensor 1 route
Vehicle speed sensor 2 route
Throttle position sensor route
Shift solenoid A route
Shift solenoid B route
Overrun clutch solenoid route
Lockup solenoid route
Line pressure solenoid route
Fluid temperature sensor route
Control unit power route
Throttle position sensor - power route
Engine speed signal route
ERASING SELF-DIAGNOSIS RESULTS
When trouble code is indicated in both ECCS control unit and A/T control unit, delete the trouble
code from both control units following the procedure below.
1. When the key switch is ON after repair operation, turn it OFF and wait at least 5 seconds, then turn
it ON (Do not start the engine).
2. Turn on CONSULT-II and press “A/T”.
3. Press “SELF-DIAG RESULTS”.
4. Press “ERASE”.
5. Press “ENGINE”.
6. Press “SELF-DIAG RESULTS”.
7. Press “ERASE”.
AT-51
Page 52
TROUBLE DIAGNOSIS
DATA MONITOR
Operation procedure
Refer to separate CONSULT-II operation manual for details.
1. Turn the key switch OFF.
2. Connect the CONSULT-II connector to the vehicle’s diagnosis connector.
3. Start the engine.
4. Select “START (X-BADGE VHCL)”, “A/T” and “DATA MONITOR” in order from CONSULT-II.
DISPLAY LIST
Monitor Item Selection
Item (Unit)
VHCL/S SE - A/T (km/h)
VHCL/S SE - MTR (km/h)
THRTL POS SEN (V)
FLUID TEMP SE (V)
BATTERY VOLT (V)
ENGINE SPEED (RPM)
TURBINE REV (RPM)
OVERDRIVE SW (ON-OFF indicator)
PN POSI SW (ON OFF)
R POSITION SW (ON-OFF)
D POSITION SW (ON-OFF)
2 POSITION SW (ON-OFF)
1 POSITION SW (ON-OFF)
ASCD - CRUISE (ON-OFF)
ASCD - OD CUT (ON-OFF)
KICKDOWN SW (ON-OFF)
POWERSHIFT SW (ON-OFF)
CLOSED THL/SW (ON-OFF)
W/O THRL/P - SW (ON-OFF)
*SHIFT S/V A (ON-OFF)
*SHIFT S/V B (ON-OFF)
TCM INPUT
SIGNALS
MAIN
SIGNALS
SELECTION
FROM MENU
Error occurs at under vehicle speed of
10 km/h and does not indicate 0 km/h
when stopped
0 is not indicated when engine
stopped. This is not a defect.
The turbine sensor is not installed but
it is indicated.
When the O/D switch is turned ON,
the switch contact point is OFF. Thus
OFF is indicated.
The ASCD is not installed but it is
indicated.
The kickdown switch is not installed
but it is indicated.
The POWER switch is not installed but
it is indicated.
Idle contact point of the throttle valve
switch.
Full contact point of the throttle valve
switch.
The check signal condition (re-input
signal) of the control unit’s control
signal output is indicated. ON or OFF
does not change when the solenoid is
in open or short circuit.
Remark
AT- 52
Page 53
Item (Unit)
*OVRRUN/C S/V
(Overrun clutch solenoid) (ON-OFF)
TROUBLE DIAGNOSIS
Monitor Item Selection
TCM INPUT
SIGNALS
MAIN
SIGNALS
SELECTION
FROM MENU
Remark
HOLD SW (ON-OFF)
BRAKE SW (ON-OFF)
GEAR
SLCT LVR POSI
VEHICLE SPEED
THROTTLE POSI
LINE PRES DTY
TCC S/V DUTY
SHIFT S/V A (ON-OFF)
SHIFT S/V B (ON-OFF)
OVERRUN/C S/V
(Overrun clutch solenoid) (ON-OFF)
Stopper lamp switch
The gear position recognized by the
control unit. It is renewed after
completion of gear shift.
The range position recognized by the
control unit. Under fail-safe operation,
the measured value used for controlling is indicated.
The speed recognized by the control
unit.
The accelerator opening recognized in
the control unit. Under fail-safe
operation, the measured value used for
controlling is indicated.
The control signal output of the control
unit.
SELF-D DP LMP (ON-OFF)
TC SLIP RATIO
TC SLIP SPEED (rpm)
Voltage (V)
Hertz (Hz)
DUTY-HI (%)
DUTY-LOW (%)
PLS WIDTH-HI (msec)
PLS WIDTH-LOW (msec)
: Standard : Optional selection
Indicates measured voltage
Indicates measured pulse
SELF-DIAGNOSIS (WITHOUT USING CONSULT-II)
General
When defect occurs in electrical system, the O/D OFF indicator light turns ON for 2 seconds and
flashes for 8 seconds if the key switch is turned ON. If normal, it turns ON for 2 seconds. To locate
the defective location, self-diagnosis starting number is inputted. Then the defect information is
outputted and O/D OFF indicator light flashes to indicate the defective location.
SELF-DIAGNOSIS
Operation procedure
1. Warm up the engine.
AT-53
Page 54
TROUBLE DIAGNOSIS
2. Place the selector lever to D range.
3. Turn the key switch ON.
4. Place the selector lever to D range and turn the brake switch ON within 2 seconds after turning the
key switch ON.
5. Place the selector lever to 2 range and turn the brake switch OFF.
6. Place the selector lever to 1 range and turn the brake switch ON.
7. Fully depress the accelerator and then fully release.
8. The A/T CHECK indicator light flashes and the self-diagnosis gets started.
CAUTION:
After performing the above procedures for the first time, the A/T CHECK indicator light might
flashes rapidly and the self-diagnosis does not get started. In this condition, turn the key
switch "OFF", wait for approximately 10 seconds and then perform the 2-8 steps above again.
A/T CHECK indicator light operation
A/T
CHECK
When defective, the light-on time for specific route is indi-
cated longer.
Light ON order
1
2
3
4
5
6
7
8
9
10
11
control unit and throttle position sensor power
Inhibitor switch, O/D switch, idle switch and full switch
Trouble Route
Vehicle speed sensor 1
Vehicle speed sensor 2
Throttle position sensor
Shift solenoid A
Shift solenoid B
Overrun clutch solenoid
Lockup solenoid
Fluid temperature sensor,
Engine revolution signal
Line pressure solenoid
Under the following cases it repeats in 4 Hz: Bad memory
lockup power, when A/T control unit is replaced, when battery was disconnected for a long time, or battery performance
is deteriorated.
Erasing self-diagnosis results
For easy diagnosis of intermittent troubles, the control unit
stores trouble information frequently during operation. This
memory will not be erased even the key switch is turn ON
and OFF several times. However, it will be erased if turns
the key switch OFF after performing the self-diagnosis or by
using CONSULT-II.
AT- 54
Page 55
VEHICLE SPEED SENSOR 1 (OUTPUT SHAFT REVOLUTION SENSOR) SYSTEM
Vehicle Speed Sensor 1 (Output Shaft Revolution Sensor) System
Inspection Procedure
1. VEHICLE SPEED SENSOR 1 (OUTPUT SHAFT REVOLUTION SENSOR)
Refer to “Components Inspection” (AT-56).
Inspection results are OK?
OK → When using CONSULT-II: Go to No. 2.
NG → Repair or replace the vehicle speed sensor 1 (Output shaft revolution sensor).
2. INPUT SIGNAL (WHEN USING CONSULT-II)
When using CONSULT-II
1. Start the engine.
2. Select TCM INPUT SIGNALS from DATA MONITOR.
3. Check the vehicle speed sensor and A/T vehicle speed while driving. Inspect if the value changes
during vehicle acceleration or deceleration.
Inspection results are OK?
OK → Go to No. 3.
NG → Inspect below items.
Open or short circuit in the main harness between the A/T control unit, ECCS control
unit and vehicle speed sensor 1 (Output shaft revolution sensor).
Refer to ECCS control unit’s ground circuit
“POWER SUPPLY CIRCUIT FOR ECM” (QG16: EC-75).
Remove the terminal from the connector housing and inspect for looseness, bends, or dam-
ages.
3. CHECK AFTER REPAIR
After driving for a while, perform the self-diagnosis again and check if still defective.
Refer to “CONSULT-II Function” (AT-50) and “Self-Diagnosis (Without Using CONSULT-II)” (AT-
53).
Inspection results are OK?
OK → End.
NG → 1. Inspect the A/T control unit’s input and output signal.
2. If NG again, re-inspect if connector’s pin terminals have defective contacts.
AT-55
Page 56
VEHICLE SPEED SENSOR 1 (OUTPUT SHAFT REVOLUTION SENSOR) SYSTEM
Component Inspection
VEHICLE SPEED SENSOR 1 (OUTPUT SHAFT REVOLUTION
SENSOR)
While the vehicle is lifted, drive the front wheels. Check if
there is power voltage (12 V) between the vehicle speed sensor 1 connector terminal No. 1 and No. 3, then check frequency of the terminal No. 2 using CONSULT-II pulse frequency meter.
CAUTION:
Connect the diagnosis data link cable to the vehicle.
When driving at 20 km/h: Approx. 150 Hz
AT- 56
Page 57
VEHICLE SPEED SENSOR 2 SYSTEM
Vehicle Speed Sensor 2 System
A/T Control Unit Input/Output Signal Standard
The value data is the reference value from the circuit tester.
Terminal No.
40
Item
Vehicle speed sensor 2
Conditions
Driving at least 1 m at 2 - 3 km/h
Inspection Procedure
1. INPUT SIGNAL
When using CONSULT-II
1. Start the engine.
2. Select TCM INPUT SIGNALS from DATA MONITOR.
3. While driving, check the vehicle speed sensor 2 and vehicle speed on the meter. Check if the value changes during vehicle acceleration or deceleration. (The vehicle
speed sensor 2 meter indicates 5 km/h when stopped.)
Without using CONSULT-II
1. Start the engine.
2. While driving at least 1 m at 2 - 3 km/h, measure the
voltage between the A/T control unit connector terminal
and ground.
Standard
Intermittently changes between approx. 0 - 4.5 V
Voltage: Intermittently changes between approx. 0 - 4.5 V
AT-57
Page 58
VEHICLE SPEED SENSOR 2 SYSTEM
Inspection results are OK?
OK → Go to No. 2.
NG → Inspect below items.
Inspect the connection between the vehicle speed sensor 2 and meter control unit.
Open or short circuit in the main harness between the A/T control unit and vehicle speed sensor.
Inspect the connector housing for terminal disconnection, looseness, twists or fallen.
2. CHECK AFTER REPAIR
After driving for a while, perform the self-diagnosis again and check if still defective.
Refer to “CONSULT-II Function” (AT-50) and “Self-Diagnosis (Without Using CONSULT-II)” (AT-
53).
Inspection results are OK?
OK → End.
NG → 1. Inspect the A/T control unit’s input and output signal.
2. If NG again, re-inspect if connector’s pin terminals have defective contacts.
Component Inspection
METER CONTROL UNIT
Refer to “COMBINATION METER - TROUBLE DIAGNOSIS” (EL-69).
AT- 58
Page 59
THROTTLE POSITION SENSOR SYSTEM
Throttle Position Sensor System
CONSULT-II Data Monitor Display
The value data is the reference value.
Monitor Item
THRTL POS SEN
Accelerator fully opened
Condition
Accelerator fully closed
A/T Control Unit Input/Output Signal Standards
The value data is the reference value from the circuit tester.
Terminal No.
16
17
32
41
42
Item
Switch
Full switch
Sensor (Power)
Throttle position
sensor
Sensor ground
When the accelerator pedal is released after warming up
When the accelerator pedal is depressed after warming up
When the accelerator pedal is depressed over one-half
after warming up
When the accelerator pedal is released after warming up
When the accelerator pedal is depressed slowly after
warming up
(When fully opened, it increases by the voltage value)
Condition
-
-
Standard Value
Approx. 0.5 V
Approx. 4.0 V
Standard
Power voltage
Approx. 0 V
Power voltage
Approx. 0 V
Approx. 4.5 - 5.5 V
Fully closed: Approx. 0.5 V
Fully opened: Approx. 4.0V
-
Inspection Procedure
1. SELF-DIAGNOSIS (ENGINE)
Perform the self-diagnosis on engine control.
Refer to “CONSULT- II Function” (QG16: EC-60).
Inspection results are OK?
OK → When using CONSULT-II: Go to No. 2.
When without using CONSULT-II: Go to No. 3.
NG → Check the DTC detected item. Refer to “Index for DTC” (QG16: EC-11).
2. INPUT SIGNAL (WHEN USING CONSULT-II)
When using CONSULT-II
1. Turn the key switch ON (Do not start the engine).
2. Select TCM INPUT SIGNALS from DATA MONITOR.
3. Measure the voltage for the “THRT POS SEN” (When accelerator pedal is fully opened, it increases by the voltage value).
Accelerator fully closed: Approx. 0.5 V
Accelerator fully opened: Approx. 4.0 V
Inspection results are OK?
OK → Go to No. 4.
NG → Inspect if open or short circuit in the main harness between the A/T control unit and
ECCS control unit for the throttle position sensor route.
Inspect for terminal fall out, looseness, twist or damages from the connector housing.
AT-59
Page 60
THROTTLE POSITION SENSOR SYSTEM
3. INPUT SIGNAL (WITHOUT USING CONSULT-II)
Without using CONSULT-II
1. Turn the key switch ON (Do not start the engine).
2. Slowly depress the accelerator pedal and measure the voltage between the A/T control unit terminals (When fully opened, the voltage increases).
Accelerator fully closed: Approx. 0.5 V
Accelerator fully opened: Approx. 4.0 V
Inspection results are OK?
OK → Go to No. 5.
NG → Inspect if open or short circuit in the main harness between the A/T control unit and
ECCS control unit for the throttle position sensor route.
Inspect for terminal fall out, looseness, twist or damages from the connector housing.
4. THROTTLE VALVE SWITCH (IDLE SWITCH/FULL SWITCH) CIRCUIT
When using CONSULT-II
1. Turn the key switch ON (Do not start the engine).
2. Select TCM INPUT SIGNALS from DATA MONITOR.
3. Slowly depressing and releasing the accelerator pedal, check if the idle switch and full switch
signals are properly displayed.
Condition
Accelerator pedal is not depressed
Accelerator pedal is fully depressed
Inspection results are OK?
OK → Go to No. 6.
NG → Inspect below items.
Refer to “Throttle Valve Switch” (AT-62).
Open or short circuit at the main harness be-
tween the key switch and throttle valve switch.
Open or short circuit at the main harness be-
tween the throttle valve switch and A/T control
unit.
Data Monitor
CLOSED THL/SW
ON
OFF
W/O THRL/P - SW
OFF
ON
AT-60
Page 61
THROTTLE POSITION SENSOR SYSTEM
5. THROTTLE VALVE SWITCH (IDLE SWITCH/FULL SWITCH) CIRCUIT (WITHOUT USING CONSULT-II)
Without using CONSULT-II
1. Turn the key switch ON (Do not start the engine).
2. Select the input items.
3. Fully depressing and releasing the accelerator pedal, measure the voltage between the A/T control unit terminal and ground. (Perform after warming up.)
Condition
Accelerator pedal is not depressed
Accelerator pedal is fully depressed
Inspection results are OK?
OK → Go to No. 6.
NG → Inspect below items.
Refer to “Throttle Valve Switch” (AT-62).
Open or short circuit at the main harness be-
tween the key switch and throttle valve switch.
Open or short circuit at the main harness be-
tween the throttle valve switch and A/T control
unit.
Terminal No. 16
Power voltage
Approx. 0 V
Voltage
Terminal No. 17
Approx. 0 V
Power voltage
6. CHECK AFTER REPAIR
After driving for a while, perform the self-diagnosis again and check if still defective.
Refer to “CONSULT-II Function” (AT-50) and “Self-Diagnosis (Without Using CONSULT-II)” (AT-53).
Inspection results are OK?
OK → End.
NG → 1. Inspect the A/T control unit’s input and output signal.
2. If NG again, re-inspect if connector’s pin terminals have defective contacts.
Components Inspection
THROTTLE POSITION SENSOR
Measure the resistance between the throttle position sensor
connector terminals.
Accelerator pedal is not depressed: Approx. 0.8 k
Accelerator pedal is fully depressed: Approx. 4.6 k
CAUTION:
The resistance increases as depresses further.
AT-61
ΩΩ
Ω
ΩΩ
ΩΩ
Ω
ΩΩ
Page 62
THROTTLE POSITION SENSOR SYSTEM
THROTTLE VALVE SWITCH
Valve Switch
Check continuity between the terminal No. 1 and No. 2.
Accelerator pedal is not depressed: Continuity
Accelerator pedal is fully depressed: No continuity
Refer to
EC-23
Full Switch
Check continuity between the terminal No. 2 and No. 3.
Accelerator pedal is not depressed: No continuity
Accelerator pedal is fully depressed: Continuity
“Throttle Valve Closed Position Learning” (QG16:
AT-62
Page 63
SHIFT SOLENOID A SYSTEM
Shift Solenoid A System
A/T Control Unit Input/Output Signal Standards
The value data is the reference value from the circuit tester.
Terminal No.
11
Item
Shift solenoid A
Condition
Shift solenoid A operates (While driving in D1 or D4)
Shift solenoid A does not operate (While driving in D2 or D3)
Inspection Procedure
1. GROUND CIRCUIT
1. Turn the key switch OFF.
2. Remove the A/T terminal assembly middle connector inside the engine room.
3. Check the resistance between the connector terminal and
ground.
Resistance: Approx. 20 - 30 Ω
Inspection results are OK?
OK → Go to No. 2.
NG → 1. Remove the control valve assembly. Refer to
“Removal • Installation” (AT-121).
2. Inspect below items.
Shift solenoid A (Refer to “Components In-
spection” (AT-64)).
Open or short circuit in A/T terminal assembly.
Standards
Power voltage
Approx. 0 V
2. POWER CIRCUIT
1. Turn the key switch OFF.
2. Remove the A/T control unit connector.
3. Check for continuity between the terminals.
4. Inspect for any short circuit in between the harness and
ground power.
5. Install the removed components.
Inspection results are OK?
OK → Go to No. 3.
NG → Repair the open circuit in the harness and con-
nector and short circuit in ground and power.
3. CHECK AFTER REPAIR
After driving for a while, perform the self-diagnosis again
and check if still defective.
Refer to “CONSULT-II Function” (AT-50) and “Self-Diag-
nosis (Without Using CONSULT-II)” (AT-53).
Inspection results are OK?
OK → End.
NG → 1. Inspect the A/T control unit’s input and output
signal.
2. If NG again, re-inspect if connector’s pin terminals have defective contacts.
AT-63
Page 64
SHIFT SOLENOID A SYSTEM
Component Inspection
SHIFT SOLENOID A
Refer to “Removal • Installation” (AT-121) in “Control Valve
• Accumulator” for removal.
Resistance
Check the resistance between the terminals.
Solenoid Valve
Shift solenoid valve A
Terminal No.
2
Ground
Resistance
Approx. 20 - 30 Ω
Operation
Apply battery voltage between the terminal and ground and
check for operation sound of the solenoid valve.
AT-64
Page 65
SHIFT SOLENOID B SYSTEM
Shift Solenoid B System
A/T Control Unit Input/Output Signal Standards
The value data is the reference value from the circuit tester.
Terminal No.
12
Item
Shift solenoid B
Condition
Shift solenoid B operates (While driving in D1 or D2)
Shift solenoid B does not operate (While driving in D3 or D4)
Inspection Procedure
1. GROUND CIRCUIT
1. Turn the key switch OFF.
2. Remove the A/T terminal assembly middle connector inside the engine room.
3. Check the resistance between the connector terminal and
ground.
Resistance: Approx. 5 - 20 Ω
Inspection results are OK?
OK → Go to No. 2.
NG → 1. Remove the control valve assembly. Refer to
“Removal • Installation” (AT-121).
2. Inspect below items.
Shift solenoid B (Refer to “Component Inspection” (AT-66)).
Open or short circuit in A/T terminal assembly.
Standard
Power voltage
Approx. 0 V
2. POWER CIRCUIT
1. Turn the key switch OFF.
2. Remove the A/T control unit connector.
3. Check for continuity between the terminals.
4. Inspect for any short circuit in between the harness and
ground power.
5. Install the removed components.
Inspection results are OK?
OK → Go to No. 3.
NG → Repair the open circuit in the harness and con-
nector and short circuit in ground and power.
3. CHECK AFTER REPAIR
After driving for a while, perform the self-diagnosis again
and check if still defective.
Refer to “CONSULT-II Function” (AT-50) and “Self-Diag-
nosis (Without Using CONSULT-II)” (AT-53).
Inspection results are OK?
OK → End.
NG → 1. Inspect the A/T control unit’s input and output
signal.
2. If NG again, re-inspect if connector’s pin terminals have defective contacts.
AT-65
Page 66
SHIFT SOLENOID B SYSTEM
Component Inspection
SHIFT SOLENOID B
Refer to “Removal • Installation” (AT-121) in “Control Valve
• Accumulator” for removal.
Resistance
Check the resistance between the terminals.
Solenoid Valve
Shift solenoid valve B
Terminal No.
1
Ground
Resistance
Approx. 5 - 20 Ω
Operation
Apply battery voltage between the terminal and ground and
check for operation sound of the solenoid valve.
AT-66
Page 67
OVERRUN CLUTCH SOLENOID SYSTEM
Overrun Clutch Solenoid System
A/T Control Unit Input/Output Signal Standards
The value data is the reference value from the circuit tester.
Terminal No.
20
Item
Overrun clutch
solenoid valve
Condition
Overrun clutch solenoid valve operates
Overrun clutch solenoid valve does not operate
Inspection Procedure
1. GROUND CIRCUIT
1. Turn the key switch OFF.
2. Remove the A/T terminal assembly middle connector inside the engine room.
3. Check the resistance between the connector terminal and
ground.
Resistance: Approx. 20 - 30 Ω
Inspection results are OK?
OK → Go to No. 2.
NG → 1. Remove the control valve assembly. Refer to
“Removal • Installation” (AT-121).
2. Inspect below items.
Overrun clutch solenoid valve (Refer to “Component In-
spection” (AT-68)).
Open or short circuit in A/T terminal assembly.
Standards
Power voltage
Approx. 0 V
2. POWER CIRCUIT
1. Turn the key switch OFF.
2. Remove the A/T control unit connector.
3. Check for continuity between the terminals.
4. Inspect for any short circuit in between the harness and
ground power.
5. Install the removed components.
Inspection results are OK?
OK → Go to No. 3.
NG → Repair the open circuit in the harness and con-
nector and short circuit in ground and power.
3. CHECK AFTER REPAIR
After driving for a while, perform the self-diagnosis again
and check if still defective.
Refer to “CONSULT-II Function” (AT-50) and “Self-Diag-
nosis (Without Using CONSULT-II)” (AT-53).
Inspection results are OK?
OK → End.
NG → 1. Inspect the A/T control unit’s input and output
signal.
2. If NG again, re-inspect if connector’s pin ter-
AT-67
minals have defective contacts.
Page 68
OVERRUN CLUTCH SOLENOID SYSTEM
Component Inspection
OVERRUN CLUTCH SOLENOID VALVE
Refer to “Removal • Installation” (AT-121) in “Control Valve
• Accumulator” for removal.
Resistance
Check the resistance between the terminals.
Solenoid Valve
Overrun clutch
solenoid valve
Terminal No.
3
Ground
Resistance
Approx. 20 - 30 Ω
Operation
Apply battery voltage between the terminal and ground and
check for operation sound of the solenoid valve.
AT-68
Page 69
LOCKUP SOLENOID SYSTEM
Lockup Solenoid System
CONSULT-II Data Monitor Display
The value data is the reference value.
Monitor Item
TCC S/V DUTY
Condition
Lockup released
Lockup engaged
A/T Control Unit Input/Output Signal Standards
The value data is the reference value from the circuit tester.
Terminal No.
20
Item
Lockup solenoid
valve
Condition
Under lockup
Without lockup
Inspection Procedure
1. GROUND CIRCUIT
1. Turn the key switch OFF.
2. Remove the A/T terminal assembly connector inside the
engine room.
3. Check the resistance between the connector terminal and
ground.
Resistance: Approx. 5 - 20 Ω
Inspection results are OK?
OK → Go to No. 2.
NG → 1. Remove the oil pan. Refer to “Control Valve •
Accumulator” (AT-121).
2. Inspect below items.
Lockup solenoid valve (Refer to “Component Inspection”
(AT-70)).
Open or short circuit in A/T terminal assembly.
Standard Value
9 %
94 %
Standard
Approx. 8 - 15 V
Approx. 0 V
2. POWER CIRCUIT
1. Turn the key switch OFF.
2. Remove the A/T control unit connector.
3. Check for continuity between the terminals.
4. Inspect for any short circuit in between the harness and
ground and power.
5. Install the removed components.
Inspection results are OK?
OK → Go to No. 3.
NG → Repair the open circuit in the harness and con-
nector and short circuit in ground and power.
AT-69
Page 70
LOCKUP SOLENOID SYSTEM
3. CHECK AFTER REPAIR
After driving for a while, perform the self-diagnosis again and check if still defective.
Refer to “CONSULT-II Function”(AT-50) and “Self-Diagnosis (Without Using CONSULT-II)” (AT-
53).
Inspection results are OK?
OK → End.
NG → 1. Inspect the A/T control unit’s input and output signal.
2. If NG again, re-inspect if connector’s pin terminals have defective contacts.
Component Inspection
LOCKUP SOLENOID VALVE
Refer to “Removal • Installation” (AT-121) in “Control Valve
• Accumulator” for removal.
Resistance
Check the resistance between the terminals.
Solenoid Valve
Lockup solenoid valve
Operation
Apply battery voltage between the terminal and ground and
check for operation sound of the solenoid valve.
Terminal No.
5
Ground
Resistance
Approx. 5 - 20 Ω
AT-70
Page 71
FLUID PRESSURE SENSOR SYSTEM AND A/T CONTROL UNIT POWER SYSTEM
CONSULT-II Data Monitor Display
The value data is the reference value.
Monitor Item
FLUID TEMP SE
A/T fluid temperature: Approx. 20°C
A/T fluid temperature: Approx. 80°C
Condition
A/T Control Unit Input/Output Signal Standards
The value data is the reference value from the circuit tester.
Terminal No.
10
19
28
42
47
Item
Power
Power
Power (Memory backup)
Ground (Fluid temperature sensor)
Fluid temperature sensor
Turn the key switch ON
Turn the key switch OFF
Turn the key switch OFF
Turn the key switch ON
A/T fluid temperature: Approx. 20°C
A/T fluid temperature: Approx. 80°C
Condition
The same as terminal No. 10
-
Inspection Procedure
1. A/T CONTROL UNIT POWER
1. Turn the key switch ON (Do not start the engine).
2. Measure the voltage between the A/T control unit connector terminal and ground.
Voltage: Power voltage
3. Turn the key switch OFF.
4. Measure the voltage between the A/T control unit connector terminal and ground.
Voltage: Power voltage
Inspection results are OK?
OK → Go to No. 2.
NG → Inspect below items.
Open or short circuit in main harness between
the key switch and A/T control unit.
Refer to “POWER SUPPLY ROUTING” (WH-
147), “FUSE BLOCK-JUNCTION BLOCK (J/B)”
(WH-183).
Standard Value
Approx. 1.5 V
Approx. 0.5 V
Standards
Power voltage
Approx. 0 V
Power voltage
Power voltage
Approx. 0 V
Approx. 1.5 V
Approx. 0.5 V
AT-71
Page 72
FLUID PRESSURE SENSOR SYSTEM AND A/T CONTROL UNIT POWER SYSTEM
2. FLUID TEMPERATURE SENSOR AND A/T TERMINAL AS-
SEMBLY
1. Turn the key switch OFF.
2. Remove the A/T terminal assembly middle connection in
the engine.
3. Measure the resistance between the connector terminals.
Resistance: 2.5 kΩ (Fluid temperature: Approx. 20°C)
: 0.3 kΩ (Fluid temperature: Approx. 80°C)
4. Install the removed components again.
Inspection results are OK?
OK → When using CONSULT-II: Go to No. 3.
Without using CONSULT-II: Go to No. 4.
NG → 1. Remove the oil pan (Refer to “Control Valve •
Accumulator” (AT-121)).
2. Inspect below items.
Fluid temperature sensor (Refer to “Component
Inspection” (AT-73)).
Open or short circuit in A/T terminal assembly.
3. INPUT SIGNAL FROM THE FLUID TEMPERATURE SEN-
SOR (WHEN USING CONSULT-II)
When using CONSULT-II
1. Start the engine.
2. Select TCM INPUT SIGNALS from DATA MONITOR.
3. Measure the voltage in the fluid temperature sensor.
When cold (Fluid temperature: Approx. 20°C): Approx. 1.5 V
When warm (Fluid temperature: Approx. 80°C): Approx. 0.5
V
Inspection results are OK?
OK → Go to No. 5.
NG → Inspect below items.
Open or short circuit in the main harness be-
tween the A/T control unit, ECCS control unit
and A/T terminal assembly.
Refer to ECCS control unit ground circuit (“POWER
SUPPLY CIRCUIT FOR ECM” (QG16: EC-75).
AT-72
Page 73
FLUID PRESSURE SENSOR SYSTEM AND A/T CONTROL UNIT POWER SYSTEM
4. INPUT SIGNAL FROM THE FLUID TEMPERATURE SEN-
SOR (WITHOUT USING CONSULT-II)
Without using CONSULT-II
1. Do not start the engine.
2. Warming up the system, measure the voltage between
the A/T control unit connector terminal and ground.
When cold (Fluid temperature: Approx. 20°C): Approx. 1.5 V
When warm (Fluid temperature: Approx. 80°C): Approx. 0.5 V
3. Turn the key switch OFF.
4. Remove the A/T control unit connector.
5. Check for continuity between the connector terminal and
ground.
Inspection results are OK?
OK → Go to No. 5.
NG → Inspect below items.
Open or short circuit in the main harness be-
tween the A/T control unit, ECCS control unit
and A/T terminal assembly.
Refer to ECCS control unit ground circuit “POWER
SUPPLY CIRCUIT FOR ECM” (QG16: EC-75).
5. CHECK AFTER REPAIR
After driving for a while, perform the self-diagnosis again
and check if still defective.
Refer to “CONSULT-II Function” (AT-50) and “Self-Diag-
nosis (Without Using CONSULT-II)” (AT-53).
Inspection results are OK?
OK → End.
NG → 1. Inspect the A/T control unit’s input and output
signal.
2. If NG again, re-inspect if connector’s pin terminals have defective contacts.
Component Inspection
FLUID TEMPERATURE SENSOR
Refer to “Removal • Installation” (AT-121) in “Control Valve
• Accumulator” for removal.
Inspect the resistance between the terminals by varying the
temperature as shown in the illustration.
Approx. 20°C: Approx. 2.5 kΩ
Approx. 80°C: Approx. 0.3 kΩ
AT-73
Page 74
ENGINE CIRCUIT SIGNAL SYSTEM
Engine Circuit Signal System
Inspection Procedure
1. ENGINE SELF-DIAGNOSIS
Inspect the ignition signal circuit by ECCS control unit self-diagnosis.
Inspection results are OK?
OK → When using CONSULT-II: Go to No. 2.
Without using CONSULT-II: Go to No. 3.
NG → Inspect the ignition signal circuit (Refer to ““DTC P0350 Ignition Signal Primary”
(QG16: EC-118).
2. INPUT SIGNAL (WHEN USING CONSULT-II)
When using CONSULT-II
1. Start the engine.
2. Select TCM INPUT SIGNALS from DATA MONITOR.
3. Inspect if the engine RPM changes according with the accelerator pedal opening while looking at
the engine RPM (When engine stopped, it indicates 0 RPM, but this is not malfunction).
Inspection results are OK?
OK → Go to No. 4.
NG → Inspect below items.
Open or short circuit in the harness between the A/T control unit and ECCS control
unit.
3. INPUT SIGNAL (WITHOUT USING CONSULT-II)
Without using CONSULT-II
1. Start the engine.
2. Measure the voltage between the A/T control unit connector terminal and ground.
At idle: Approx. 0.5 - 1.5 V
Inspection results are OK?
OK → Go to No. 4.
NG → Inspect below items.
Open or short circuit in the harness between
the A/T control unit and ECCS control unit.
AT-74
Page 75
ENGINE CIRCUIT SIGNAL SYSTEM
4. CHECK AFTER REPAIR
After driving for a while, perform the self-diagnosis again and check if still defective.
Refer to
53).
Inspection results are OK?
OK → End.
NG → 1. Inspect the A/T control unit’s input and output signal.
“CONSULT-II Function” (AT-50) and “Self-Diagnosis (Without Using CONSULT-II)” (AT-
2. If NG again, re-inspect if connector’s pin terminals have defective contacts.
AT-75
Page 76
LINE PRESSURE SOLENOID SYSTEM
Line Pressure Solenoid System
CONSULT-II Data Monitor Display
The value data is the reference value.
Monitor Item
LINE PRES DTY
Condition
Low line pressure
High line pressure
A/T Control Unit Input/Output Signal Standards
The value data is the reference value from the circuit tester.
Terminal No.
1
2
Item
Line pressure
solenoid valve
Line pressure
solenoid valve (Via
dropping resistor)
When accelerator pedal is released after engine warm up
When accelerator pedal is fully depressed after engine
warm up
When accelerator pedal is released after engine warm up
When accelerator pedal is fully depressed after engine
warm up
Condition
Inspection Procedure
1. GROUND CIRCUIT
1. Turn the key switch OFF.
2. Remove the A/T terminal assembly middle connection in
the engine.
3. Measure the resistance between the connector terminals.
Resistance: Approx. 2.5 - 5.0 Ω
Inspection results are OK?
OK → Go to No. 2.
NG → 1. Remove the control valve assembly. (Refer to
“Removal • Installation” (AT-121)).
2. Inspect below items.
Line pressure solenoid (Refer to “Compo-
nent Inspection” (AT-77)).
Open or short circuit in A/T terminal assem-
bly.
Standard Value
29 %
94 %
Standards
Approx. 1.5 - 3.0 V
Approx. 0 V
Approx. 4 - 14 V
Approx. 0 V
AT-76
Page 77
LINE PRESSURE SOLENOID SYSTEM
2. POWER CIRCUIT
1. Start the engine.
2. Remove the A/T control unit connector.
3. Measure the resistance between the terminals.
Resistance
Terminal No. 2 - No. 4: Approx. 12 Ω
Terminal No. 1 - No. 4: Approx. 0 Ω
Inspection results are OK?
OK → Go to No. 3.
NG → Inspect below items.
Dropping resistor (Refer to “Component Inspec-
tion” (AT-77)).
Open or short circuit of the main harness be-
tween the A/T control unit terminal No. 1 & 2
and the A/T terminal assembly.
3. CHECK AFTER REPAIR
After driving for a while, perform the self-diagnosis again
and check if still defective.
Refer to “CONSULT-II Function” (AT-50) and “Self-Diag-
nosis (Without Using CONSULT-II)” (AT-53).
Inspection results are OK?
OK → End.
NG → 1. Inspect the A/T control unit’s input and output
signal.
2. If NG again, re-inspect if connector’s pin terminals have defective contacts.
Component Inspection
LINE PRESSURE SOLENOID
Refer to “Removal • Installation” (AT-121) in “Control Valve
• Accumulator”.
Resistance
Measure the resistance between the terminals.
Solenoid Valve
Lockup solenoid valve
Operation
Apply battery voltage between the terminal and ground and
check for operation sound of the solenoid valve.
Terminal No.
4
Ground
Resistance
Approx. 2.5 - 5.0 Ω
AT-77
Page 78
LINE PRESSURE SOLENOID SYSTEM
DROPPING RESISTOR
Measure the resistance between the terminals.
Resistance: Approx. 12 Ω
AT-78
Page 79
INHIBITOR SWITCH, O/D SWITCH, IDLE SWITCH AND FULL SWITCH SYSTEMS
Inhibitor Switch, O/D Switch, Idle Switch and Full Switch Systems
Inspection Procedure
1. INHIBITOR SWITCH CIRCUIT (WHEN USING CONSULT-II)
When using CONSULT-II
1. Turn the key switch ON (Start the engine).
2. Select TCM INPUT SIGNALS from DATA MONITOR.
3. By moving the selector lever to P, R, N, D, 3, 2, and 1, check if the value on the display identical
with selected position (At P range, the N range switch comes ON).
Inspection results are OK?
OK → Go to No. 3.
NG → Inspect below items.
Open or short circuit in the main harness between the key switch and inhibitor switch.
Inhibitor switch (Refer to “Component Inspection” (AT-82)).
Open or short circuit in the main harness between the inhibitor switch and A/T control
unit.
Diode (P, N position).
AT-79
Page 80
INHIBITOR SWITCH, O/D SWITCH, IDLE SWITCH AND FULL SWITCH SYSTEMS
2. INHIBITOR SWITCH CIRCUIT (WITHOUT USING CONSULT-II)
Without using CONSULT-II
1. Turn the key switch ON (Do not start the engine).
2. By moving the selector lever to P, R, N, D, 2, and 1, measure power between the A/T control unit connector terminal and ground.
Voltage
B: Power voltage
O: Approx. 0 V
Range
P, N
R
D
2
1
36
35
B
0
0
0
0
0
B
0
0
0
Terminal
34
0
0
B
0
0
27
0
0
0
B
0
Inspection results are OK?
OK → Go to No. 4.
NG → Inspect below items.
Inhibitor switch (Refer to “Component Inspec-
tion” (AT-82)).
Open or short circuit in the main harness be-
tween the key switch and inhibitor switch.
Open or short circuit in the main harness be-
tween the inhibitor switch and A/T control unit.
Diode (P, N position).
3. O/D SWITCH CIRCUIT (WHEN USING CONSULT-II)
When using CONSULT-II
1. Turn the key switch ON (Do not start the engine).
2. Select TCM INPUT SIGNALS from DATA MONITOR.
3. Check if the lever switch indicator on the display changes
ON and OFF when moving the shift lever from 3 to D.
(When the shift lever is in 3, it displays as “ON” and When
the shift lever is in D, it displays as “OFF”.)
Inspection results are OK?
OK → Go to No. 5.
NG → Inspect below items.
O/D switch (Refer to “Component Inspection”
(AT-82)).
Open or short circuit in the main harness be-
tween the A/T control unit and O/D switch.
Open or short circuit in the main harness O/D
switch ground circuit.
26
0
0
0
0
B
AT-80
Page 81
INHIBITOR SWITCH, O/D SWITCH, IDLE SWITCH AND FULL SWITCH SYSTEMS
4. O/D SWITCH CIRCUIT (WITHOUT USING CONSULT-II)
Without using CONSULT-II
1. Turn the key switch ON (Do not start the engine).
2. By turning ON and OFF the O/D switch, measure the voltage between the A/T control unit connector terminals and
ground.
O/D switch ON: Power voltage
O/D switch OFF: Approx. 0 V
Inspection results are OK?
OK → Go to No. 6.
NG → Inspect below items.
O/D switch (Refer to “Components Inspection”
(AT-82)).
Open or short circuit in the main harness be-
tween the A/T control unit and O/D switch.
Open or shirt circuit in the main harness O/D
switch ground circuit.
5. THROTTLE VALVE SWITCH CIRCUIT (WITHOUT USING
CONSULT-II)
Without using CONSULT-II
1. Turn the key switch ON (Do not start the engine).
2. Select TCM INPUT SIGNALS from DATA MONITOR.
3. By operating accelerator pedal, check if the idle switch
and full switch properly turns ON and OFF.
Accelerator Pedal Operation
When released
When fully depressed
Inspection results are OK?
OK → Go to No. 7.
NG → Inspect below items.
Throttle valve switch (Refer to “Components In-
spection” (AT-82)).
Open or short circuit in the main harness be-
tween the key switch and throttle valve switch.
Open or short circuit in the main harness be-
tween the throttle valve switch and A/T control
unit.
CLOSED THL/SW
“ON”
“OFF”
Monitor Item
W/O THRL/P - SW
“OFF”
“ON”
AT-81
Page 82
INHIBITOR SWITCH, O/D SWITCH, IDLE SWITCH AND FULL SWITCH SYSTEMS
6. THROTTLE VALVE SWITCH CIRCUIT (WITHOUT USING
CONSULT-II)
Without using CONSULT-II
1. Turn the key switch ON (Engine warmed up/Do not start
the engine).
2. By operating accelerator pedal, measure the voltage between the A/T control unit connector terminal and ground.
Accelerator Pedal Operation
When released
When fully depressed
Terminal No. 16
Power voltage
Approx. 0 V
Voltage
Terminal No. 17
Approx. 0 V
Power voltage
Inspection results are OK?
OK → Go to No. 7.
NG → Inspect below items.
Throttle valve switch (Refer to “Components Inspection” (AT-82)).
Open or short circuit in the main harness between the key switch and throttle valve switch.
Open or short circuit in the main harness between the throttle valve switch and A/T
control unit.
7. CHECK AFTER REPAIR
After driving for a while, perform the self-diagnosis again and check if still defective.
Refer to “CONSULT-II Function” (AT-50) and “Self-Diagnosis (Without Using CONSULT-II)” (AT-53).
Inspection results are OK?
OK → End.
NG → 1. Inspect the A/T control unit’s input and output signal.
2. If NG again, re-inspect if connector’s pin terminals have defective contacts.
Component Inspection
INHIBITOR SWITCH
1. By moving the selector lever, check the continuity between
the inhibitor switch connector terminals.
Range Position
P
R
N
D
2
1
2. If NG, re-inspect while control cable removed. Refer the step 1.
3. If inspection becomes OK after removing the cable, adjust
the control cable. (Refer to “Adjustment During Installation”
(AT-120))
Terminal No.
1 - 2, 3 - 7
3 - 8
3 - 9
3 - 6
3 - 5
3 - 4
Continuity
No continuity if not
the selected
position
AT-82
Page 83
INHIBITOR SWITCH, O/D SWITCH, IDLE SWITCH AND FULL SWITCH SYSTEMS
4. If still NG after removing the cable, remove the inhibitor switch and check for continuity between the
inhibitor terminals. Refer to the step 1.
5. If OK after removing the inhibitor switch, inspect the inhibitor switch. (Refer to “Inhibitor Switch” (AT-
123)).
6. If still NG after removing the inhibitor switch, then replace the inhibitor switch.
O/D SWITCH
Check the continuity between the terminals.
Range
3
D
Continuity
No continuity
Continuity
THROTTLE VALVE SWITCH
Idle switch
Check the continuity between the terminal No. 1 and No. 2.
Accelerator Pedal Operation
Released
Depressed over one-half
Continuity
Continuity
No continuity
Refer to “Throttle Position Sensor Adjustment” (QG:15 EC-114),
“Throttle Valve Closed Position Learning” (QG16: EC-23).
FULL SWITCH
Check the continuity between the terminal No. 2 and No. 3.
Accelerator Pedal Operation
Released
Depressed over one-half
Continuity
No continuity
Continuity
AT-83
Page 84
TROUBLE DIAGNOSIS BY SYMPTOMS
Trouble Diagnosis by Symptoms
A/T CHECK Indicator Light does not Turn ON
SYMPTOM
A/T CHECK indicator light does not turn on for approx. 2 seconds after turning the key switch ON.
INSPECTION PROCEDURE
1. A/T CONTROL UNIT POWER
1. Turn the key switch ON (Do not start the engine).
2. Measure the voltage between A/T control unit terminal and ground.
Voltage
Terminal No. 10, 19, and 29 - Ground: Power voltage
3. Turn the key switch OFF.
4. Measure the voltage between A/T control unit terminal and ground.
Voltage
Terminal No. 28 - Ground: Power voltage
Terminal No. 10 and 19 - Ground: Approx. 0V
Inspection results are OK?
OK → Go to No. 2.
NG → Inspect below items.
Open or short circuit in the main harness between the key switch and A/T control unit.
Key switch and fuse.
2. A/T CONTROL UNIT GROUND CIRCUIT
1. Turn the key switch OFF.
2. Remove the A/T control unit connector.
3. Check the continuity between the terminal No. 25, 28 and the ground.
4. If OK, then check if the harness is shorted to the ground and power.
Inspection results are OK?
OK → Go to No. 3.
NG → Repair the short circuit between the harness and connector ground and power.
AT-84
Page 85
TROUBLE DIAGNOSIS BY SYMPTOMS
3. A/T CHECK INDICATOR LIGHT CIRCUIT
1. Turn the key switch OFF.
2. Check the resistance between the A/T control unit connector terminal No. 10 and No. 13.
Resistance: 50 - 100 Ω
3. Install all removed components.
Inspection results are OK?
OK → Go to No. 4.
NG → Inspect below items.
A/T CHECK indicator light: Refer to “COMBINATION METER - TROUBLE DIAGNOSIS”
(EL-69).
Open or short circuit in the main harness and fuse between the key switch and O/D
OFF indicator light.
Open or short circuit in the harness between the O/D OFF indicator light and A/T con-
trol unit.
4. CHECK AFTER REPAIR
Re-inspect if symptoms occur again.
Inspection results are OK?
OK → Inspection results.
NG → 1. Inspect the A/T control unit’s input and output signal.
2. If NG again, re-inspect if connector’s pin terminals have defective contacts.
Engine does not Start in P and N Ranges
SYMPTOM
Engine does not start in P and N ranges.
Engine does not start in D, 3, 2, 1, and R ranges.
INSPECTION TIPS
1. INHIBITOR SWITCH CIRCUIT
When using CONSULT-II
Check if the inhibitor switch circuit trouble is displayed in TCM INPUT SIGNALS from DATA MONITOR.
Without using CONSULT-II
From the results of self-diagnosis, check if the inhibitor switch
circuit trouble is indicated.
Inspection results are OK?
OK → Inspect the inhibitor switch circuit.
NG → Go to No. 2.
AT-85
Page 86
TROUBLE DIAGNOSIS BY SYMPTOMS
2. INHIBITOR SWITCH
Inspect for any open or short circuit between the inhibitor
switch connector terminals.
Refer to “Inhibitor Switch” (AT-82).
Inspection results are OK?
OK → Go to No. 3.
NG → Replace the inhibitor switch.
3. STARTER
Inspect the starter system. Refer to respective “Wire Diagram”.
Inspection results are OK?
OK → End.
NG → Repair or replace the defective component(s).
The Vehicle Moves in P Range when Pushed
SYMPTOM
While in P range, the vehicle moves when pushed without engaging the parking apparatus.
INSPECTION TIPS
1. PARKING APPARATUS
Inspect the parking apparatus.
Refer to “Standard Model” (AT-132).
Inspection results are OK?
OK → End.
NG → Repair or replace the defective component(s).
The Vehicle Drives in N Range
SYMPTOM
The vehicle drives forward or backward in N range.
AT-86
Page 87
TROUBLE DIAGNOSIS BY SYMPTOMS
INSPECTION TIPS
1. INHIBITOR SWITCH CIRCUIT
When using CONSULT-II
Check if the inhibitor switch circuit trouble is displayed in
TCM INPUT SIGNALS from DATA MONITOR.
Without using CONSULT-II
From the results of self-diagnosis, check if the inhibitor switch
circuit trouble is indicated.
Inspection results are OK?
OK → Inspect the inhibitor switch circuit.
NG → Go to No. 2.
2. CONTROL VALVE
Inspect the control valve.
Refer to “Shift Control System” (AT-119).
Inspection results are OK?
OK → Go to No. 3.
NG → Adjust the control cable. (Refer to “Shift Control
System” (AT-119))
3. A/T ATF LEVEL
Re-inspect the A/T ATF level.
Inspection results are OK?
OK → Go to No. 4.
NG → Add A/T fluid.
AT-87
Page 88
TROUBLE DIAGNOSIS BY SYMPTOMS
4. A/T ATF CONDITION
1. Remove the oil pan.
2. Inspect the A/T fluid condition.
Inspection results are OK?
OK → Go to No. 5.
NG → 1. Disassemble the A/T.
2. Inspect below items.
Forward clutch assembly
Overrun clutch assembly
Reverse clutch assembly
5. CHECK AFTER REPAIR
Re-inspect if symptom occur again.
Inspection results are OK?
OK → End.
NG → Inspect the A/T control unit’s input and output
signal.
If NG again, re-inspect if connector’s pin ter-
minals have defective contacts.
Too much Shift Shock when Shifting from N to R Range
SYMPTOM
There is high shift shock when shifting from N to R range.
INSPECTION TIPS
1. SELF-DIAGNOSIS RESULTS
Does the self-diagnosis results indicate the fluid temperature sensor, line pressure solenoid valve and the lock sensor?
YES → Inspect the trouble system. Refer to “Fluid Tem-
perature Sensor System and A/T Control Unit
Power System” (AT-71), “Line Pressure Solenoid
System” (AT-76) and “Throttle Position Sensor
System” (AT-59).
NO → Go to No. 2.
2. THROTTLE POSITION SENSOR
Inspect the throttle position sensor.
Refer to “Throttle Position Sensor System”
“DTC P0122, P0123 Throttle Position Sensor-2 Circuit”
(QG16: EC-148).
Inspection results are OK?
OK → Go to No. 3.
NG → Repair or replace the throttle position sensor.
AT-88
Page 89
TROUBLE DIAGNOSIS BY SYMPTOMS
3. LINE PRESSURE
Check the line pressure during idle in D range.
Refer to
Inspection results are OK?
OK → Go to No. 4.
NG → 1. Remove the control valve assembly. (Refer to
“Line Pressure Test” (AT-27).
“Removal • Installation” (AT-121))
2. Inspect below items.
Line pressure control valve (pressure regu-
lator valve, pressure modify valve, pilot
valve and pilot filter).
Line pressure solenoid valve.
4. CHECK AFTER REPAIR
Re-inspect if symptoms occur again.
Inspection results are OK?
OK → End.
NG → 1. Inspect the A/T control unit’s input and output
signal.
2. If NG again, re-inspect if connector’s pin terminals have defective contacts.
The Vehicle cannot Drive in R Range or Extremely Bad Acceleration
SYMPTOM
The vehicle has no creep effect in R range. Or extremely bad
acceleration.
INSPECTION TIPS
1. A/T FLUID LEVEL
Re-inspect the A/T fluid level.
Inspection results are OK?
OK → Go to No. 2.
NG → Add ATF.
AT-89
Page 90
TROUBLE DIAGNOSIS BY SYMPTOMS
2. STALL TEST
Inspect the stall RPM in 1 and R range.
Refer to
Inspection results are OK?
OK → Go to No. 3.
NG 1 → When OK in 1 range and NG in R range
NG 2 → Go to No. 6 if NG in 1 and R ranges.
“Stall Test” (AT-25).
1. Remove the control valve assembly. (Refer to
“Removal • Installation” (AT-121))
2. Inspect below items.
Line pressure control valve (pressure regu-
lator valve, pressure modify valve, pilot
valve and pilot filter)
Line pressure solenoid valve
3. Disassemble the A/T.
4. Inspect below items.
Oil pump assembly
Torque converter
Reverse clutch assembly
High clutch assembly
3. LINE PRESSURE
Inspect the line pressure during idle in R range.
Refer to “Line Pressure Test” (AT-27).
Inspection results are OK?
OK → Go to No. 4.
NG → 1. Remove the control assembly. (Refer to “Re-
moval • Installation” (AT-121))
2. Inspect below items.
Refer to line pressure control valve (pres-
sure regulator valve, pressure modify valve,
pilot valve and pilot filter)
Line pressure solenoid valve
3. Disassemble the A/T.
4. Inspect below items.
Oil pump
AT-90
Page 91
TROUBLE DIAGNOSIS BY SYMPTOMS
4. A/T FLUID CONDITION
1. Remove the oil pan.
2. Inspect the A/T fluid condition.
Inspection results are OK?
OK → Go to No. 5.
NG → Go to No. 6.
5. CHECK AFTER REPAIR
Re-inspect if symptom occurs again.
Inspection results are OK?
OK → End.
NG → 1. Inspect the A/T control unit’s input and output signal.
2. If NG again, re-inspect if connector’s pin terminals have defective contacts.
6. DETECTING DEFECTIVE ITEMS
1. Remove the control valve assembly. (Refer to “Removal • Installation” (AT-121))
2. Inspect below items.
Line pressure control valve (pressure regulator valve, pressure modify valve, pilot valve and
pilot filter).
Disassemble the A/T.
3. Disassemble the A/T.
4. Inspect below items.
Oil pump assembly
Torque converter
Reverse clutch assembly
High clutch assembly
Low and reverse brake assembly
Low one-way clutch
Inspection results are OK?
OK → Go to No. 5.
NG → Repair or replace the defective component(s).
The Vehicle cannot Drive in D, 3, 2, 1 Range or Extremely Bad Acceleration
SYMPTOM
The vehicle has no creep effect in D, 3, 2, 1 range.
AT-91
Page 92
TROUBLE DIAGNOSIS BY SYMPTOMS
INSPECTION TIPS
1. A/T FLUID LEVEL
Re-inspect the A/T fluid level.
Inspection results are OK?
OK → Go to No. 2.
NG → Add A/T.
2. STALL TEST
Inspect the stall RPM in D range.
Refer to “Stall Test” (AT-25).
Inspection results are OK?
OK → Go to No. 3.
NG → Go to No. 6.
3. LINE PRESSURE
Inspect the line pressure during idle in D range.
Refer to “Line Pressure Test” (AT-27).
Inspection results are OK?
OK → Go to No. 4.
NG → 1. Remove the control assembly. (Refer to “Re-
moval • Installation” (AT-121))
2. Inspect below items.
Line pressure control valve (pressure regu-
lator valve, pressure modify valve, pilot
valve and pilot filter)
Line pressure solenoid valve
3. Disassemble the A/T.
4. Inspect below items.
Oil pump
AT-92
Page 93
TROUBLE DIAGNOSIS BY SYMPTOMS
4. A/T FLUID CONDITION
1. Remove the oil pan.
2. Inspect the A/T fluid condition.
Inspection results are OK?
OK → Go to No. 5.
NG → Go to No. 6.
5. CHECK AFTER REPAIR
Re-inspect if symptom occurs again.
Inspection results are OK?
OK → End.
NG → 1. Inspect the A/T control unit’s input and output signal.
2. If NG again, re-inspect if connector’s pin terminals have defective contacts.
6. DETECTING DEFECTIVE ITEMS
1. Remove the control valve assembly. (Refer to “Removal • Installation” (AT-121))
2. Inspect below items.
Line pressure control valve (pressure regulator valve, pressure modify valve, pilot valve and
pilot filter)
Line pressure solenoid valve
3. Disassemble the A/T.
4. Inspect below items.
Oil pump assembly
Forward clutch assembly
Forward one-way clutch
Low one-way clutch
Low and reverse brake assembly
Torque converter
Inspection results are OK?
OK → Go to No. 5.
NG → Repair or replace the defective component(s).
The Vehicle does not Start from D1
SYMPTOM
The vehicle does not start from D1 in road test part 1.
AT-93
Page 94
TROUBLE DIAGNOSIS BY SYMPTOMS
INSPECTION TIPS
1. SYMPTOM CHECK
Is there creep effect in R range?
OK → Go to No. 2.
NG → Go to “The Vehicle cannot Drive in R Range or Extremely Bad Acceleration” (AT-89).
2. SELF-DIAGNOSIS RESULTS
Does the self-diagnosis results indicate the vehicle speed
sensor 1 (Output shaft revolution sensor), shift solenoid A
and B or vehicle speed sensor 2 after road test?
YES → Inspect the trouble system. Refer to “Vehicle
Speed Sensor 1 (Output Shaft Revolution Sensor)
System” (AT-55), “Shift Solenoid A System” (AT-
63), “Shift Solenoid B System” (AT-65) and “Ve-
hicle Speed Sensor 2 System” (AT-57).
NO → Go to No. 2.
3. THROTTLE POSITION SENSOR
Inspect the throttle position sensor.
Refer to “Throttle Position Sensor System” (QG:15 EC-
73), “DTC P0122, P0123 Throttle Position Sensor-2 Circuit” (QG16: EC-148).
Inspection results are OK?
OK → Go to No. 3.
NG → Repair or replace the throttle position sensor.
4. LINE PRESSURE
Check the line pressure under throttle point in D range.
Refer to “Line Pressure Test” (AT-27).
Inspection results are OK?
OK → Go to No. 5.
NG → Go to No. 8.
AT-94
Page 95
TROUBLE DIAGNOSIS BY SYMPTOMS
5. A/T FLUID CONDITION
1. Remove the oil pan.
2. Inspect the A/T fluid condition.
Inspection results are OK?
OK → Go to No. 6.
NG → Go to No. 8.
6. DETECTING DEFECTIVE ITEMS
1. Remove the control valve assembly. (Refer to “Removal • Installation” (AT-121))
2. Inspect below items.
Sift valve A
Sift valve B
Sift solenoid A
Sift solenoid B
Pilot valve
Pilot filter
Inspection results are OK?
OK → Go to No. 7.
NG → Repair or replace the defective component(s).
7. CHECK AFTER REPAIR
Re-inspect if symptom occurs again.
Inspection results are OK?
OK → End.
NG → 1. Inspect the A/T control unit’s input and output signal.
2. If NG again, re-inspect if connector’s pin terminals have defective contacts.
AT-95
Page 96
TROUBLE DIAGNOSIS BY SYMPTOMS
8. DETECTING DEFECTIVE ITEMS
1. Remove the control valve assembly. (Refer to
2. Inspect below items.
Sift valve A
Sift valve B
Sift solenoid A
Sift solenoid B
Pilot valve
Pilot filter
3. Disassemble the A/T.
4. Inspect below items.
Forward clutch assembly
Forward one-way clutch
Low one-way clutch
High clutch assembly
Torque converter
Oil pump assembly
Inspection results are OK?
OK → Go to No. 7.
NG → Repair or replace the defective component.
“Removal • Installation” (AT-121))
Does not Shift from D1 to D2 in D Range. Does not Kickdown from D4 to D2
SYMPTOM
While in D range, it does not shift from D1 to D2. Also, it does not kickdown from D4 to D2 when fully
depressing the accelerator pedal.
INSPECTION TIPS
1. SYMPTOM CHECK
Is there creep effect in D, 3, 2, and 1 range and can start from D1 during the road test?
YES → Go to No. 2.
NO → Go to “The Vehicle cannot Drive in D, 3, 2, 1 Range or Extremely Bad Acceleration” (AT-
91) or “The Vehicle does not Start from D1” (AT-93).
AT-96
Page 97
TROUBLE DIAGNOSIS BY SYMPTOMS
2. INHIBITOR SWITCH CIRCUIT
When using CONSULT-II
Check if the inhibitor switch circuit trouble is displayed in
TCM INPUT SIGNALS from DATA MONITOR.
Without using CONSULT-II
From the results of self-diagnosis, check if the inhibitor switch
circuit trouble is indicated.
Inspection results are OK?
OK → Inspect the inhibitor switch circuit.
NG → Go to No. 3.
3. VEHICLE SPEED SENSOR 1 (OUTPUT SHAFT REVOLUTION
SENSOR) AND VEHICLE SPEED SENSOR 2 CIRCUIT
Inspect the vehicle speed sensor 1 (Output shaft revolution
sensor) and vehicle speed sensor 2 circuit.
Refer to “Vehicle Speed Sensor 1 (Output Shaft Revolu-
tion Sensor) System” (AT-55) and “Vehicle Speed Sensor
2 System” (AT-57).
Inspection results are OK?
OK → Go to No. 4.
NG → Repair or replace the vehicle speed sensor 1 (Output
shaft revolution sensor) and vehicle speed sensor 2.
4. THROTTLE POSITION SENSOR
Inspect the throttle position sensor.
Refer to “DTC P0122, P0123 Throttle Position Sensor-2
Circuit” (QG16: EC-148).
Inspection results are OK?
OK → Go to No. 5.
NG → Repair or replace the throttle position sensor.
5. A/T FLUID CONDITION
1. Remove the oil pan.
2. Inspect the A/T fluid condition.
Inspection results are OK?
OK → Go to No. 6.
NG → Go to No. 8.
AT-97
Page 98
TROUBLE DIAGNOSIS BY SYMPTOMS
6. DETECTING DEFECTIVE ITEMS
1. Remove the control valve assembly. (Refer to
2. Inspect below items.
Sift valve A
Sift solenoid A
Pilot valve
Pilot filter
Inspection results are OK?
OK → Go to No. 7.
NG → Repair or replace the defective component(s).
“Removal • Installation” (AT-121))
7. CHECK AFTER REPAIR
Re-inspect if symptom occurs again.
Inspection results are OK?
OK → End.
NG → 1. Inspect the A/T control unit’s input and output signal.
2. If NG again, re-inspect if connector’s pin terminals have defective contacts.
8. DETECTING DEFECTIVE ITEMS
1. Remove the control valve assembly. (Refer to “Removal • Installation” (AT-121))
2. Inspect below items.
Sift valve A
Sift solenoid A
Pilot valve
Pilot filter
3. Disassemble the A/T.
4. Inspect below items.
Servo piston assembly
Brake band
Oil pump assembly
Inspection results are OK?
OK → Go to No. 7.
NG → Repair or replace the defective component.
Does not Shift from D2 to D3 in D Range
SYMPTOM
While driving to specified speed, it does not shift from D2 to D3
AT-98
Page 99
TROUBLE DIAGNOSIS BY SYMPTOMS
INSPECTION TIPS
1. SYMPTOM CHECK
Is there creep effect in D, 3, 2, and 1 range and can start from D1 during the road test?
YES → Go to No. 2.
NO → Go to “The Vehicle cannot Drive in D, 3, 2, 1 Range or Extremely Bad Acceleration” (AT-
91) or “The Vehicle does not Start from D1” (AT-93).
2. INHIBITOR SWITCH CIRCUIT
When using CONSULT-II
Check if the inhibitor switch circuit trouble is displayed in
TCM INPUT SIGNALS from DATA MONITOR.
Without using CONSULT-II
From the results of self-diagnosis, check if the inhibitor switch
circuit trouble is indicated.
Inspection results are OK?
OK → Inspect the inhibitor switch circuit.
NG → Go to No. 3.
3. THROTTLE POSITION SENSOR
Inspect the throttle position sensor.
Refer to “DTC P0122, P0123 Throttle Position Sensor-2 Circuit” (QG16: EC-148).
Inspection results are OK?
OK → Go to No. 4.
NG → Repair or replace the throttle position sensor.
AT-99
Page 100
TROUBLE DIAGNOSIS BY SYMPTOMS
4. A/T FLUID CONDITION
1. Remove the oil pan.
2. Inspect the A/T fluid condition.
Inspection results are OK?
OK → Go to No. 5.
NG → Go to No. 7.
5. DETECTING DEFECTIVE ITEMS
1. Remove the control valve assembly. (Refer to “Removal • Installation” (AT-121))
2. Inspect below items.
Sift valve B
Sift solenoid B
Pilot valve
Pilot filter
Inspection results are OK?
OK → Go to No. 6.
NG → Repair or replace the defective component(s).
6. CHECK AFTER REPAIR
Re-inspect if symptom occurs again.
Inspection results are OK?
OK → End.
NG → 1. Inspect the A/T control unit’s input and output signal.
2. If NG again, re-inspect if connector’s pin terminals have defective contacts.
AT-100
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