Mitsubishi AUTOMATIC TRANSMISSION SPECIFICATIONS
AUTOMATIC
TRANSMISSION
23-1
CONTENTS
SERVICE SPECIFICATIONS 2.................
LUBRICANT 2...............................
SPECIAL TOOLS 2..........................
TROUBLESHOOTING 4.......................
ON-VEHICLE SERVICE 44...................
Essential Service 44............................
A/T Control Component Location 50.............
A/T Control Component Check 51...............
23109000576
Torque Converter Stall Test 53..................
Hydraulic Pressure Test 55.....................
Hydraulic Circuit 60............................
Line Pressure Adjustment 61....................
Selector Lever Operation Check 61..............
TRANSMISSION CONTROL* 63..............
SHIFT LOCK AND KEY INTERLOCK
MECHANISMS 66...........................
TRANSMISSION ASSEMBLY 68..............
WARNING REGARDING SERVICING OF SUPPLEMENTAL RESTRAINT SYSTEM (SRS) EQUIPPED VEHICLES
WARNING!
(1) Improper service or maintenance of a n y component of the SRS, or any SRS-related component, can lead to personal
injury or death to service personnel (from inadvertent firing of the airbag) or to driver and passenger (from rendering
the SRS inoperative).
(2) Service or maintenance of any SRS component or SRS-related component must be performed only at an authorized
MITSUBISHI dealer.
(3) MITSUBISHI dealer personnel must thoroughly review this manual, and especially its GROUP 52B - Supplemental
Restraint System(SRS)beforebeginningany service or maintenance ofany component of the SRS or anySRS-related
component.
NOTE
The SRS includes the following components: SRS-ECU, SRS warning lamp, air bag module, clock spring, side impact sensors and
interconnecting wiring. Other SRS-related components (that may have to be removed/installed in connection with SRS service or
maintenance) are indicated in the table of contents by an asterisk (*).
23-2
AUTOMATIC TRANSMISSION -
Service Specifications/Lubricant/Special Tools
SERVICE SPECIFICATIONS
Items Standard value
Oil temperature sensor kW at 0_C 16.5 - 20.5
at 100_C 0.57 - 0.69
Resistance of damper clutch control solenoid valve coil (at 20_C) W 2.7 - 3.4
Resistance of Low-Reverse solenoid valve coil (at 20_C) W 2.7 - 3.4
Resistance of second solenoid valve coil (at 20_C) W 2.7 - 3.4
Resistance of underdrive solenoid valve coil (at 20_C) W 2.7 - 3.4
Resistance of overdrive solenoid valve coil (at 20_C) W 2.7 - 3.4
Stall speed r/min 4G93 2,200 - 2,700
4G64 2,300 - 2,800
LUBRICANT
Items Specified lubricant Quantity L
23100030284
23100040270
Transmission fluid DIA QUEEN ATF SPII, ATF SPII Mor
equivalent
SPECIAL TOOLS
Tool Number Name Use
MB991502 MUT-II sub
assembly
MD998330
(including
MD998331)
MD998332 Adapter
Oil pressure gauge
(2,942 kPa)
Checking of the diagnosis code
Measurement of oil pressure
7.8
23100060351
MD998900 Adapter
AUTOMATIC TRANSMISSION -
Tool Number Name Use
Special Tools
23-3
MB990635 or
MB991113
MB991610 Oil filter wrench Removal and installation of automatic trans-
GENERAL
SERVICE
TOOL
MZ203827
MB991453 Engine hanger
Steering linkage
puller
Engine lifter Supporting the engine assembly during
assembly
Ball joint disconnection
mission oil filter
removal and installation of the transmission
Supporting the engine assembly during
removal and installation of the transmission
23-4
AUTOMATIC TRANSMISSION -
Troubleshooting
TROUBLESHOOTING
STANDARD FLOW OF DIAGNOSIS TROUBLESHOOTING
Gathering information from customer.
Check ATF .
Check trouble symptoms.
Read the diagnosis code (GROUP00
- How to Use Troubleshooting/In-
spection Service Points.)
Diagnosis code
displayed
Erase the diagnosis code (GROUP
00 - How to Use Troubleshooting/Inspection Service Points.)
Carry out the essential service
(Refer to P.23-44.)
OK
Replace the A/T-ECU.
Check trouble symptoms.
NG
Communication with
MUT-II not possible
No diagnosis code displayed
NG
Replace ATF.
23100760657
Inspection Chart For Trouble
Symptoms (Refer to P.23-24.)
Road test (Refer to P.23-6.)
Abnormality exists
(diagnosis code
present)
To INSPECTION CHART FOR
DIAGNOSIS CODES
(Refer to P.23-12.)
Search for cause.
Repair
NG
Confirmation test (road test)
No abnormality
Recheck diagnosis codes which
were read before the road test.
Diagnosis
code displayed
To INSPECTION CHART FOR
TROUBLE SYMPTOMS
(Refer to P.23-24.)
Found Not found
OK
NG
INTERMITTENT MALFUNCTION
(GROUP 00 - Points to Note for
Intermittent Malfunctions.)
OK
Completed
Abnormality exists (no diagnosis code)
No diagnosis
code displayed
AUTOMATIC TRANSMISSION -
Troubleshooting
23-5
DIAGNOSIS FUNCTION
1. N range lamp
The N range lamp flashes at a frequency of approximately
1 Hz if there is an abnormality in any of the items in the
table below which are related to the A/T system. Check
the diagnosis code output if the N range lamp is flashing
at a frequency of approximately 1 Hz.
N range lamp flashing items
Crank angle sensor
Input shaft speed sensor
Output shaft speed sensor
Each solenoid valve
Out of phase at each shift point
Caution
If the N range lamp is flashing at a frequency of
approximately 2 Hz (faster than at 1 Hz), it means that
the automatic transmission fluid temperature is too high.
Stop the vehicle in a safe place and wait until the N range
lamp switches off.
2. Method of reading the diagnosis code
Use the MUT-II or the N range lamp to take a reading of
the diagnosis codes. (Refer to GROUP 00 - How to Use
Troubleshooting/Inspection Service Points.)
23100770292
23-6
AUTOMATIC TRANSMISSION -
Troubleshooting
ROAD TEST
Check by the following procedure.
No. State prior to test
and operation
1 Ignition switch:
OFF
2 Ignition switch:
ON
Engine: Stopped
Selector lever
position: P
position: P
3 Ignition switch:
ST
Engine: Stopped
Test and operation Judgement value Check item Diag-
Ignition switch
(1) ON
Selector lever
position
(1) P, (2) R,
(3) N, (4) D,
(5) 3, (6) 2, (7) L
Accelerator pedal
(1) Released
(2) Half depressed
(3) Depressed
Brake pedal
(1) Depressed
(2) Released
Starting test with
lever P or N range
Data list No. 54
Battery voltage [V]
Data list No. 61
(1) P, (2) R, (3)N,
(4) D, (5) 3, (6) 2,
(7) L
Data list No. 11
(1) 300 - 1,000 mV
(2) Gradually rises
from (1)
(3) 4,500 - 5,500
mV
Data list No. 25
(1) OFF
(2) ON
Data list No. 26
(1) ON
(2) OFF
Starting should be
possible
23100780622
Inspection
nosis
code
No.
Control relay 54 A/T Control
Inhibitor switch - Inhibitor switch
Throttle position sensor
<4G93>
Accelerator
pedal position
sensor
<4G64>
Wide open
throttle switch
Stop lamp
switch
Starting
possible or
impossible
11
12
14
25 Wide open
26 Stop lamp switch
- Starting
procedure page
if there is an
abnormality
relay system
(23-23)
system (23-35)
Throttle
position sensor
system (23-13)
Accelerator
pedal position
sensor system
(23-13)
throttle switch
system (23-15)
system (23-16)
impossible
(23-27)
4 Warming up Drive for 15
minutes or more so
that the automatic
fluid temperature
becomes 70 90_C.
Data list No. 15
Gradually rises to
70 - 90_C
Oil temperature
sensor
15 Oil temperature
sensor system
(23-13)
AUTOMATIC TRANSMISSION -
Troubleshooting
23-7
No. State prior to test
and operation
5 Engine: Idling
Selector lever
position: N
Test and operation Judgement value Check item Diag-
nosis
code
No.
Brake pedal
(Retest)
(1) Depressed
(2) Released
A/C switch
(1) ON
(2) OFF
Accelerator pedal
(1) Released
(2) Half depressed
Selector lever
position
(1) N ® D
(1) N ® D
(2) N ® R
Data list No. 26
(1) ON
(2) OFF
Data list No. 65
(1) ON
(2) OFF
Data list No. 21
(1) 550 - 850 r/min
Gradually rises
from (1)
Data list No. 57
(2) Data changes
Should be no
abnormal shifting
shocks
Time lag should be
within 2 seconds
Stop lamp
switch
Dual pressure
switch
Crank angle
sensor
Communication
with engineECU
Malfunction
when starting
Driving
impossible
26 Stop lamp switch
- Dual pressure
21 Crank angle
51 Serial
- Engine stalling
- Shocks when
- Shocks when
- Shocks when
- Does not move
- Does not
- Does not move
Inspection
procedure page
if there is an
abnormality
system (23-16)
switch system
(23-35)
sensor system
(23-14)
communication
system (23-23)
during shifting
(23-29)
changing from N
to D and large
time lag (23-29)
changing from N
to R and large
time lag (23-30)
changing from N
to D,N to R and
large time lag
(23-31)
forward (23-27)
reverse (23-28)
(forward or
reverse) (23-28)
23-8
AUTOMATIC TRANSMISSION -
Troubleshooting
No. State prior to test
and operation
6 Selector lever
position: N
(Carry out on a
flat and straight
road.)
Test and operation Judgement value Check item Diag-
nosis
code
No.
Selector lever
position and
vehicle speed
(1) Idling in
L range
(Vehicle
stopped)
(2) Driving at
constant speed
of
10 km/h in
L position
(3) Driving at
constant speed
of
30 km/h in
2 position
(4) Driving at
50 km/h in
3 position with
accelerator fully
closed
(5) Driving at
constant speed
of
50 km/h in
D position
(Each
condition
should be
maintained for
10 seconds or
more.)
Data list No. 63
(2) 1st, (4) 3rd, (3)
2nd, (5) 4th
Data list No. 31
(2) 0 %, (4) 100 %,
(3) 100 %, (5) 100
%
Data list No. 32
(2) 0 %, (4) 0 %,
(3) 0 %, (5) 100 %
Data list No. 33
(2)100 %, (4) 100
%, (3) 0 %, (5) 0 %
Data list No. 34
(2) 100 %, (4) 0 %,
(3) 100 %, (5) 0 %
Data list No. 29
(1) 0 km/h
(4) 50 km/h
Data list No. 22
(4) 1,800 - 2,100
r/min
Data list No. 23
(4) 1,800 - 2,100
r/min
Shift condition - -
Low and reverse
solenoid valve
Underdrive
solenoid valve
Second
solenoid valve
Overdrive
solenoid valve
Vehicle speed
sensor
Input shaft
speed sensor
Output shaft
speed sensor
31 Low and reverse
32 Underdrive
33 Second solenoid
34 Overdrive
- Vehicle speed
22 Input shaft speed
23 Output shaft
Inspection
procedure page
if there is an
abnormality
solenoid valve
system (23-16)
solenoid valve
system (23-16)
valve system
(23-16)
solenoid valve
system (23-16)
sensor system
(23-36)
sensor system
(23-14)
speed sensor
system (23-15)
7 Selector lever
position: 3
(Carry out on a
flat and straight
road.)
Selector lever
position and
vehicle speed
(1) Release the ac-
celerator pedal
fully while driving at 50 km/h
in 3rd gear.
(2) Driving at
constant speed
of 50 km/h in
3rd gear.
Data list No. 36
(1) 0 %
(2) Approx. 70 - 90
%
Data list No. 52
(1) Approx.
100 - 300 r/min
(2) Approx.
0 - 10 r/min
Damper clutch
control solenoid
valve
36
52
Damper clutch
control solenoid
valve system
(23-17)
AUTOMATIC TRANSMISSION -
Troubleshooting
23-9
No. State prior to test
and operation
8 Use the MUT-II to
stop the INVECSII function.
Selector lever (1) Accelerate to specified output
position: D
(Carry out on a flat
and straight road.)
and straight road.)
Test and operation Judgement value Check item Diag-
Monitor data list
No. 11, 23, and 63
with the MUT-II.
4th gear at a
throttle
position
position
sensor output
of 1.5V
(accelerator
opening angle
of 30 %).
(2) Gently
(2) Gently
decelerate to a
standstill.
(3) Accelerate to
4th gear at a
throttle
position
sensor output
of 2.5 V
(accelerator
opening angle
of 50%).
(4) While driving at
60 km/h in 4th
gear, shift
down to
3 range.
(5) While driving at
40 km/h in 3rd
gear, shift
down to
2 range.
(6) While driving at
20 km/h in 2nd
gear, shift
down to
down to
L range.
For (1), (2) and (3),
the reading should
be the same as the
shaft speed and no
abnormal shocks
should occur .
should occur .
For (4), (5) and (6),
downshifting
should occur
immediately
after the shifting
operation is made.
operation is made.
Malfunction
when shifting
Displaced
shifting points
Does not shift
Does not shift
from 1 to 2 or 2
to 1
Does not shift
from 2 to 3 or 3
to 2
Does not shift
from 3 to 4 or 4
to 3
Inspection
nosis
code
No.
- Shocks and
- All points (23-32)
- Some points
- No diagnosis
22 Input shaft
23 Output shaft
31 Low and reverse
33 Second
41 1st gear ratio is
42 2nd gear ratio is
33 Second
34 Overdrive
42 2nd gear ratio is
43 3rd gear ratio is
32 Underdrive
33 Second
43 3rd gear ratio is
44 4th gear ratio is
procedure page
if there is an
abnormality
running up
(23-31)
(23-33)
code (23-33)
speed sensor
system (23-14)
speed sensor
system (23-15)
solenoid valve
system (23-16)
solenoid valve
system (23-16)
not specified
(23-18)
not specified
(23-19)
solenoid valve
system (23-16)
solenoid valve
system (23-16)
not specified
(23-19)
not specified
(23-20)
solenoid valve
system (23-16)
solenoid valve
system (23-16)
not specified
(23-20)
not specified
(23-21)
23-10
AUTOMATIC TRANSMISSION -
Troubleshooting
No. State prior to test
and operation
9 Selector lever
position: N
(Carry out on a
(Carry out on a
flat and straight
road.)
SHIFT PATTERN
<4G93>
UPSHIFT PATTERN
Throttle opening %
100
Test and operation Judgement value Check item Diag-
Monitor data list
No. 22
and No. 23 with the
MUT-II.
(1) Move selector
lever to
The ratio between
data list No. 22 and
No. 23 should be
the same as the
gear ratio when
reversing.
Does not shift
R range, drive
at constant
speed of
10 km/h.
Thick line: Standard shift pattern
122
3
3
4
Inspection
nosis
code
No.
procedure page
if there is an
abnormality
22 Input shaft
speed sensor
system (23-14)
23 Output shaft
speed sensor
system (23-15)
46 Reverse gear
ratio is not
specified (23-22)
50
0
1,000
DOWNSHIFT PATTERN
Throttle opening %
100
122
50
1
2®3
movement
range
2,000
3
2 (L)
3®4
movement
range
3,000
Output shaft speed r/min
3
4
4,000
2
3 (L,2)
5,000
6,000
Thick line: Standard shift pattern
3
7,000
4 (L,2,3)
2¬3
movement
range
0
1,000
3¬4
movement
range
2,000
3,000 4,000 5,000 6,000 7,000
Output shaft speed r/min
<4G64>
UPSHIFT PATTERN
AUTOMATIC TRANSMISSION -
Troubleshooting
23-11
Throttle opening %
100
1
50
0
1,000 2,000
DOWNSHIFT PATTERN
Throttle opening %
100
2
2 ® 3
movement
range
Thick line: Standard shift pattern
2
3
3,000 4,000
Output shaft speed r/min
3
3 ® 4
movement
range
4
5,000 6,000
Thick line: Standard shift pattern
7,000
50
1
2
1
0
2
2 ¬ 3
movement
range
1,000 2,000 3,000 4,000
2 (L)
3
3
3 ¬ 4
movement
range
4
2
Output shaft speed r/min
3 (L,2)
3
5,000 6,000
4 (L,2,3)
7,000
23-12
AUTOMATIC TRANSMISSION -
Troubleshooting
INSPECTION CHART FOR DIAGNOSIS CODE
Code Diagnosis item Reference page
11 Throttle position sensor system Short circuit 23-13
12
14
15 Oil temperature sensor system Open circuit 23-13
21 Crank angle sensor system Open circuit 23-14
22 Input shaft speed sensor system Short circuit/open circuit 23-14
23 Output shaft speed sensor system Short circuit/open circuit 23-15
25 Wide open throttle switch system Short circuit 23-15
26 Stop lamp switch system Short circuit/open circuit 23-16
31 Low and reverse solenoid valve system Short circuit/open circuit 23-16
32 Underdrive solenoid valve system Short circuit/open circuit 23-16
33 Second solenoid valve system Short circuit/open circuit 23-16
<4G93>
Accelerator pedal position sensor system
Accelerator pedal position sensor system
<4G64>
Open circuit 23-13
Sensor maladjustment 23-13
23100790588
34 Overdrive solenoid valve system Short circuit/open circuit 23-16
36 Damper control clutch solenoid valve system Short circuit/open circuit 23-17
41 1st gear ratio does not meet the specification 23-18
42 2st gear ratio does not meet the specification 23-19
43 3rd gear ratio does not meet the specification 23-20
44 4th gear ratio does not meet the specification 23-21
46 Reverse gear ratio does not meet the specification 23-22
51 Abnormal communication with engine-ECU 23-23
52 Damper control clutch solenoid valve system Defective system 23-17
54 A/T Control relay system Short circuit to earth/
open circuit
56 N range lamp system Short circuit to earth 23-24
23-23
AUTOMATIC TRANSMISSION -
Troubleshooting
INSPECTION PROCEDURES FOR DIAGNOSIS CODES
23-13
Code No. 11, 12, 14 Throttle position sensor system
<4G93>, accelerator pedal position sensor system
<4G64>
If the TPS or APS output voltage is 4.8 V or higher when the engine is idling, the
output is judged to be too high and diagnosis code No. 11 is output. If the TPS or
APS output voltage is 0.2 V or lower at times other than when the engine is idling,
the output is judged to be too low and diagnosis code No. 12 is output. If the TPS
or APS output voltage is 0.2 V or lower or if it is 1.2 V or higher when the engine
is idling, the TPS or APS adjustment is judged to be incorrect and diagnosis code
No. 14 is output.
Throttle position sensor check <4G93>
(Refer to GROUP 13B - On-vehicle Service
Accelerator pedal position sensor check<4G64>
(Refer to GROUP 13A - On-vehicle Service
OK
Check the following connectors:
D A-73, B-11 <4G93>
D A-63, A-27, B-11 <4G64>
OK
Harness check
D Between throttle position sensor and A/T-ECU
<4G93>
D Between accelerator pedal position sensor and A/T-ECU
<4G64>
OK
Check the trouble symptoms.
link=13100320030.)
link=13600430011.)
NG
NG
NG
NG
Replace
Repair
Repair
Replace the A/T-ECU.
Probable cause
D Malfunction of the throttle position sensor <4G93>
D Malfunction of the accelerator pedal position sensor
<4G64>
D Malfunction of connector
D Malfunction of the A/T-ECU
Code No. 15 Oil temperature sensor system Probable cause
If the oil temperature sensor output voltage is 2.6 V or more even after driving for
10 minutes or more (if the oil temperature does not increase), it is judged that there
is an open circuit in the oil temperature sensor and diagnosis code No. 15 is output.
Oil temperature sensor check (Refer to P.23-51.)
OK
Check the following connectors:
Harness check
D Between oil temperature sensor and A/T-ECU
Check the trouble symptoms.
A-88, B-11
OK
OK
NG
NG
NG
NG
Replace
Repair
Repair
D Malfunction of the oil temperature sensor
D Malfunction of connector
D Malfunction of the A/T-ECU
Replace the A/T-ECU.
23-14
AUTOMATIC TRANSMISSION -
Troubleshooting
Code No. 21 Crank angle sensor system Probable cause
If no output pulse is detected from the crank angle sensor for 5 seconds or more
while driving at 25 km/h or more, it is judged that there is an open circuit in the
crank angle sensor and diagnosis code No. 21 is output.
D Malfunction of the crank angle sensor
D Malfunction of connector
D Malfunction of the A/T-ECU
Check the following connectors:
Harness check
D Between crank angle sensor and A/T-ECU
Crank angle sensor system check
(Refer to GROUP 13 - Troubleshooting.)
Check the trouble symptoms.
A-71, B-51, B-11
OK
OK
OK
NG
NG
NG
Repair
Repair
Replace the A/T-ECU.
Code No. 22 Input shaft speed sensor system Probable cause
If no output pulse is detected from the input shaft speed sensor for 1 second or
more while driving in 3rd or 4th gear at a speed of 30 km/h or more, there is judged
to be an open circuit or short-circuit in the input shaft speed sensor and diagnosis
code No. 22 is output. If diagnosis code No. 22 is output four times, the transmission
is locked into 3rd gear (D range) or 2nd gear as a fail-safe measure, and the N
range lamp flashes at a frequency of 1 Hz.
Measure at the input shaft speed sensor
connector A-90.
D Disconnect the connector and
measure at the harness side.
(1) Voltage between 3 and earth
(Ignition switch: ON)
OK:
(2) Voltage between 2 and earth
(3) Continuity between 1 and earth
Measure output waveform of the input
shaft speed sensor.
(using an oscilloscope)
D Engine: 2,000 r/min (approx. 50
D Transmission: 3rd gear (Voltage)
Check the trouble symptoms.
Battery voltage
(Ignition switch: ON)
OK
approx. 5 V
OK:
Continuity
OK
km/h)
OK:
Conforms to the waveform
shown at page 23-43 (Inspection procedure using an oscilloscope). There is no noise
in the output waveform.
OK
NG
NG
NG
Check the following connectors:
A-90, B-14, B-93, B-89, B-11
OK
Check the following harness:
D Between the input shaft speed
sensor and the ignition switch
D Between the input shaft speed
sensor and A/T-ECU
OK
Check the trouble symptoms.
Replace the input shaft speed sensor.
Check the trouble symptoms.
Replace the A/T-ECU.
D Malfunction of the input shaft speed sensor
D Malfunction of the underdrive clutch retainer
D Malfunction of connector
D Malfunction of A/T-ECU
L
: Refer to the Transmission Workshop Manual.
NG
NG
NG
NG
Repair
Repair
Replace the A/T-ECU.
A/T overhaul K
D Replace the underdrive clutch
Check the trouble symptoms.
Eliminate the cause of the noise.
retainer.
NG
AUTOMATIC TRANSMISSION -
Troubleshooting
Code No. 23 Output shaft speed sensor system Probable cause
If the output from the output shaft speed sensor is continuously 50% lower than the
vehicle speed for 1 second or more while driving in 3rd or 4th gear at a speed of
30 km/h or more, there is judged to be an open circuit or short-circuit in the output
shaft speed sensor and diagnosis code No. 23 is output.
If diagnosis code No. 23 is output four times, the transmission is locked into 3rd
gear (D range) or 2nd gear as a fail-safe measure, and the N range lamp flashes
at a frequency of 1 Hz.
Measure at the output shaft speed sensor connector A-82.
D Disconnect the connector and
measure at the harness side.
(1) Voltage between 3 and earth
(Ignition switch: ON)
OK:
(2) Voltage between 2 and earth
(3) Continuity between 1 and earth
Measure output waveform of the output
shaft speed sensor.
(using an oscilloscope)
D Engine: 2,000 r/min
D Transmission: 3rd gear
Check the trouble symptoms.
Battery voltage
(Ignition switch: ON)
OK:
approx. 5 V
OK:
Continuity
OK
(approx. 50 km/h)
(Voltage)
OK:
Conforms to the waveform
shown at page 23-43 (Inspection procedure using an oscilloscope). There is no noise
in the output waveform.
OK
NG
NG
NG
Check the following connectors:
A-82, B-14, B-93, B - 89, B-11
OK
Check the following harness:
D Between the output shaft speed
sensor and the ignition switch
D Between the output shaft speed
sensor and A/T-ECU
OK
Check the trouble symptoms.
Replace the output shaft speed sensor.
Check the trouble symptoms.
Replace the A/T-ECU.
D Malfunction of the output shaft speed sensor
D Malfunction of the transfer drive gear or driven gear
D Malfunction of connector
D Malfunction of the A/T-ECU
L
: Refer to the Transmission Workshop Manual.
NG
NG
NG
NG
Repair
Repair
Replace the A/T-ECU.
A/T overhaul L
D Replace the transfer drive gear and
Check the trouble symptoms.
Eliminate the cause of the noise.
23-15
driven gear.
NG
Code No. 25 Wide open throttle switch system Probable cause
If the wide open throttle switch is on for 1 second or more with the throttle valve
opening angle at 70% or less, it is judged that there is a short circuit in the wide
open throttle switch and diagnosis code No. 25 is output.
Wide open throttle switch check (Refer to P.23-64.)
OK
Check the following connectors:
Harness check
D Between the wide open throttle switch and the A/T-ECU.
Check the trouble symptoms.
B-61, B-10
OK
OK
NG
NG
NG
NG
Replace
Repair
Repair
D Malfunction of the wide open throttle switch
D Malfunction of connector
D Malfunction of A/T-ECU
Replace the A/T-ECU.
23-16
AUTOMATIC TRANSMISSION -
Troubleshooting
Code No. 26 Stop lamp switch system Probable cause
If the stop lamp switch is on for 5 minutes or more while driving, it is judged that
there is a short circuit in the stop lamp switch and diagnosis code No. 26 is output.
D Malfunction of the stop lamp switch
D Malfunction of connector
D Malfunction of the A/T-ECU
Stop lamp switch check (Refer to GROUP 35 - Brake Pedal.)
OK
Check the following connectors:
Harness check
D Between stop lamp switch and A/T-ECU
Check the trouble symptoms.
B-28, B-65, B-14, B-10
OK
OK
NG
NG
NG
NG
Replace
Repair
Repair
Replace the A/T-ECU.
Code No. 31 Low and reverse solenoid valve system
Code No. 32 Underdrive solenoid valve system
Code No. 33 Second solenoid valve system
Code No. 34 Overdrive solenoid valve system
If the resistance value for a solenoid valve is too large or too small, it is judged
that there is a short-circuit or an open circuit in the solenoid valve and the respective
diagnosis code is output. The transmission is locked into 3rd gear as a fail-safe measure,
and the N range lamp flashes at a frequency of 1 Hz.
Solenoid valve check (Refer to P.23-52.)
OK
Check the following connectors:
Harness check
D Between solenoid valve and A/T-ECU
A-88, A -12X, B-12, B-10
OK
OK
NG
NG
NG
Replace
Repair
Repair
Probable cause
D Malfunction of solenoid valve
D Malfunction of connector
D Malfunction of the A/T-ECU
Replace the solenoid valve.
Check the trouble symptoms.
NG
Replace the A/T-ECU.
AUTOMATIC TRANSMISSION -
Troubleshooting
23-17
Code No. 36, 52 Damper clutch control solenoid valve
system
If the resistance value for the damper clutch control solenoid valve is too large or
too small, it is judged that there is a short-circuit or an open circuit in the damper
clutch control solenoid valve and diagnosis code No. 36 is output. If the drive duty
rate for the damper clutch control solenoid valve is 100 % for a continuous period
of 4 seconds or more, it is judged that there is an abnormality in the damper clutch
control system and diagnosis code No. 52 is output. When diagnosis code No. 36
is output, the transmission is locked into 3rd gear as a fail-safe measure, and the
N range lamp flashes at a frequency of 1 Hz.
Damper clutch control solenoid valve check (Refer to P.23-52.)
OK
Check the following connectors:
Harness check
D Between damper clutch control solenoid valve and A/T-ECU
Replace the damper clutch control solenoid valve.
Check the trouble symptoms.
A-88, A-12X, B-12
OK
OK
NG
NG
NG
NG
Replace
Repair
Repair
Replace the A/T-ECU.
Probable cause
D Malfunction of the damper clutch control solenoid valve
D Malfunction of connector
D Malfunction of the A/T-ECU
23-18
AUTOMATIC TRANSMISSION -
Troubleshooting
Code No. 41 1st gear ratio does not meet the specification Probable cause
If the output from the output shaft speed sensor multiplied by the 1st gear ratio is
not the same as the output from the input shaft speed sensor after shifting to 1st
gear has been completed, diagnosis code No. 41 is output. If diagnosis code No.
41 is output four times, the transmission is locked into 3rd gear as a fail-safe measure,
and the N range lamp flashes at a frequency of 1 Hz.
MUT-IISelf-Diag code
Is the diagnosis code No. 22 output?
No
MUT-IISelf-Diag code
Is the diagnosis code No. 23 output?
No
Measure output waveform from the input shaft speed sensor. (using
an oscilloscope)
D Connect the connector A-90 and measure voltage between
31 and 43 at the A/T-ECU.
D Engine: 2,000 r/min (approx. 50 km/h)
D Selector lever position: 3
(Voltage)
OK:
A waveform such as the one shown on P.23-43(Inspection
Procedure Using an Oscilloscope) is output (flashing between 0 ¨ 5V) and there is no noise appearing in
the waveform.
OK
Yes
Yes
NG
D Malfunction of the input shaft speed sensor
D Malfunction of the output shaft speed sensor
D Malfunction of the underdrive clutch retainer
D Malfunction of the transfer drive gear or driven gear
D Malfunction of the low and reverse brake system
D Malfunction of the underdrive clutch system
D Noise generated
L
: Refer to the Transmission Workshop Manual.
Code No. 22 Input shaft speed sensor system check
(Refer to P.23-14.)
Code No. 23 Output shaft speed sensor system check
(Refer to P.23-15.)
Replace the input shaft speed sensor.
Check the trouble symptoms.
A/T overhaul L
D Replace the underdrive clutch retainer.
Check the trouble symptoms.
NG
NG
Measure output waveform from the output shaft speed sensor.
(using an oscilloscope)
D Connect the connector A-82 and measure voltage between
32 and 43 at the A/T-ECU.
D Engine: 2,000 r/min (approx. 50 km/h)
D Selector lever position: 3
(Voltage)
OK:
A waveform such as the one shown on P.23-43(Inspection
Procedure Using an Oscilloscope) is output (flashing between 0 ¨ 5V) and there is no noise appearing in
the waveform.
OK
A/T overhaul L
D Underdrive clutch system check
(No. 42, No. 43, or no diagnosis code is output).
D Low and reverse brake system check
(No. 46 or no diagnosis code is output).
NG
Eliminate the cause of the noise.
Replace the output shaft speed sensor.
Check the trouble symptoms.
NG
A/T overhaul L
D Replace the transfer drive gear and driven gear.
Check the trouble symptoms.
NG
Eliminate the cause of the noise.
AUTOMATIC TRANSMISSION -
Troubleshooting
CodeNo.422ndgear ratio does notmeet thespecification Probable cause
If the output from the output shaft speed sensor multiplied by the 2nd gear ratio
is not the same as the output from the input shaft speed sensor after shifting to
2nd gear has been completed, diagnosis code No. 42 is output. If diagnosis code
No. 42 is output four times, the transmission is locked into 3rd gear as a fail-safe
measure, and the N range lamp flashes at a frequency of 1 Hz.
MUT-IISelf-Diag code
Is the diagnosis code No. 22 output?
No
MUT-IISelf-Diag code
Is the diagnosis code No. 23 output?
No
Measure output waveform from the input shaft speed sensor. (using
an oscilloscope)
D Connect the connector A-90 and measure voltage between
31 and 43 at the A/T-ECU.
D Engine: 2,000 r/min (approx. 50 km/h)
D Selector lever position: 3
(Voltage)
OK:
A waveform such as the one shown on P.23-43(Inspection
Procedure Using an Oscilloscope) is output (flashing between 0 ¨ 5V) and there is no noise appearing in
the waveform.
OK
Yes
Yes
NG
D Malfunction of the input shaft speed sensor
D Malfunction of the output shaft speed sensor
D Malfunction of the underdrive clutch retainer
D Malfunction of the transfer drive gear or driven gear
D Malfunction of the second brake system
D Malfunction of the underdrive clutch system
D Noise generated
L
: Refer to the Transmission Workshop Manual.
Code No. 22 Input shaft speed sensor system check
(Refer to P.23-14.)
Code No. 23 Output shaft speed sensor system check
(Refer to P.23-15.)
Replace the input shaft speed sensor.
Check the trouble symptoms.
A/T overhaul L
D Replace the underdrive clutch retainer.
Check the trouble symptoms.
23-19
NG
NG
Measure output waveform from the output shaft speed sensor.
(using an oscilloscope)
D Connect the connector A-82 and measure voltage between
32 and 43 at the A/T-ECU.
D Engine: 2,000 r/min (approx. 50 km/h)
D Selector lever position: 3
(Voltage)
OK:
A waveform such as the one shown on P.23-43(Inspection
Procedure Using an Oscilloscope) is output (flashing between 0 ¨ 5V) and there is no noise appearing in
the waveform.
OK
A/T overhaul L
D Underdrive clutch system check
(No. 41, No. 43, or no diagnosis code is output).
D Second brake system check
(No. 44 or no diagnosis code is output).
NG
Eliminate the cause of the noise.
Replace the output shaft speed sensor.
Check the trouble symptoms.
NG
A/T overhaul L
D Replace the transfer drive gear and driven gear.
Check the trouble symptoms.
NG
Eliminate the cause of the noise.
23-20
AUTOMATIC TRANSMISSION -
Troubleshooting
CodeNo.433rd gear ratio does not meet thespecification Probable cause
If the output from the output shaft speed sensor multiplied by the 3rd gear ratio is
not the same as the output from the input shaft speed sensor after shifting to 3rd
gear has been completed, diagnosis code No. 43 is output. If diagnosis code No.
43 is output four times, the transmission is locked into 3rd gear as a fail-safe measure,
and the N range lamp flashes at a frequency of 1 Hz.
MUT-IISelf-Diag code
Is the diagnosis code No. 22 output?
No
MUT-IISelf-Diag code
Is the diagnosis code No. 23 output?
No
Measure output waveform from the input shaft speed sensor. (using
an oscilloscope)
D Connect the connector A-90 and measure voltage between
31 and 43 at the A/T-ECU.
D Engine: 2,000 r/min (approx. 50 km/h)
D Selector lever position: 3
(Voltage)
OK:
A waveform such as the one shown on P.23-43(Inspection
Procedure Using an Oscilloscope) is output (flashing between 0 ¨ 5V) and there is no noise appearing in
the waveform.
OK
Yes
Yes
NG
D Malfunction of the input shaft speed sensor
D Malfunction of the output shaft speed sensor
D Malfunction of the underdrive clutch retainer
D Malfunction of the transfer drive gear or driven gear
D Malfunction of the underdrive clutch system
D Malfunction of the overdrive clutch system
D Noise generated
L
: Refer to the Transmission Workshop Manual.
Code No. 22 Input shaft speed sensor system check
(Refer to P.23-14.)
Code No. 23 Output shaft speed sensor system check
(Refer to P.23-15.)
Replace the input shaft speed sensor.
Check the trouble symptoms.
A/T overhaul L
D Replace the underdrive clutch retainer.
Check the trouble symptoms.
NG
NG
Measure output waveform from the output shaft speed sensor.
(using an oscilloscope)
D Connect the connector A-82 and measure voltage between
32 and 43 at the A/T-ECU.
D Engine: 2,000 r/min (approx. 50 km/h)
D Selector lever position: 3
(Voltage)
OK:
A waveform such as the one shown on P.23-43(Inspection
Procedure Using an Oscilloscope) is output (flashing between 0 ¨ 5V) and there is no noise appearing in
the waveform.
OK
A/T overhaul L
D Underdrive clutch system check
(No. 41, No. 42, or no diagnosis code is output).
D Overdrive clutch system check
(No. 44 or no diagnosis code is output).
NG
Eliminate the cause of the noise.
Replace the output shaft speed sensor.
Check the trouble symptoms.
NG
A/T overhaul L
D Replace the transfer drive gear and driven gear.
Check the trouble symptoms.
NG
Eliminate the cause of the noise.
AUTOMATIC TRANSMISSION -
Troubleshooting
CodeNo. 44 4thgear ratio does not meet thespecification Probable cause
If the output from the output shaft speed sensor multiplied by the 4th gear ratio is
not the same as the output from the input shaft speed sensor after shifting to 4th
gear has been completed, diagnosis code No. 44 is output. If diagnosis code No.
44 is output four times, the transmission is locked into 3rd gear as a fail-safe measure,
and the N range lamp flashes at a frequency of 1 Hz.
MUT-IISelf-Diag code
Is the diagnosis code No. 22 output?
No
MUT-IISelf-Diag code
Is the diagnosis code No. 23 output?
No
Measure output waveform from the input shaft speed sensor. (using
an oscilloscope)
D Connect the connector A-90 and measure voltage between
31 and 43 at the A/T-ECU.
D Engine: 2,000 r/min (approx. 50 km/h)
D Selector lever position: 3
(Voltage)
OK:
A waveform such as the one shown on P.23-43(Inspection
Procedure Using an Oscilloscope) is output (flashing between 0 ¨ 5V) and there is no noise appearing in
the waveform.
OK
Yes
Yes
NG
D Malfunction of the input shaft speed sensor
D Malfunction of the output shaft speed sensor
D Malfunction of the underdrive clutch retainer
D Malfunction of the transfer drive gear or driven gear
D Malfunction of the second brake system
D Malfunction of the overdrive clutch system
D Noise generated
L
: Refer to the Transmission Workshop Manual.
Code No. 22 Input shaft speed sensor system check
(Refer to P.23-14.)
Code No. 23 Output shaft speed sensor system check
(Refer to P.23-15.)
Replace the input shaft speed sensor.
Check the trouble symptoms.
A/T overhaul L
D Replace the underdrive clutch retainer.
Check the trouble symptoms.
23-21
NG
NG
Measure output waveform from the output shaft speed sensor.
(using an oscilloscope)
D Connect the connector A-82 and measure voltage between
32 and 43 at the A/T-ECU.
D Engine: 2,000 r/min (approx. 50 km/h)
D Selector lever position: 3
(Voltage)
OK:
A waveform such as the one shown on P.23-43(Inspection
Procedure Using an Oscilloscope) is output (flashing between 0 ¨ 5V) and there is no noise appearing in
the waveform.
OK
A/T overhaul L
D Second brake system check
(No. 42 or no diagnosis code is output).
D Overdrive clutch system check
(No. 43 or no diagnosis code is output).
NG
Eliminate the cause of the noise.
Replace the output shaft speed sensor.
Check the trouble symptoms.
NG
A/T overhaul L
D Replace the transfer drive gear and driven gear.
Check the trouble symptoms.
NG
Eliminate the cause of the noise.
23-22
AUTOMATIC TRANSMISSION -
Troubleshooting
Code No. 46 Reverse gear ratio does not meet the
specification
If the output from the output shaft speed sensor multiplied by the reverse gear ratio
is not the same as the output from the input shaft speed sensor after shifting to
reverse gear has been completed, diagnosis code No. 46 is output. If diagnosis code
No. 46 is output four times, the transmission is locked into 3rd gear as a fail-safe
measure, and the N range lamp flashes at a frequency of 1 Hz.
MUT-IISelf-Diag code
Is the diagnosis code No. 22 output?
No
MUT-IISelf-Diag code
Is the diagnosis code No. 23 output?
No
Measure output waveform from the input shaft speed sensor. (using
an oscilloscope)
D Connect the connector A-90 and measure voltage between
31 and 43 at the A/T-ECU.
D Engine: 2,000 r/min (approx. 50 km/h)
D Selector lever position: 3
(Voltage)
OK:
A waveform such as the one shown on P.23-43(Inspection
Procedure Using an Oscilloscope) is output (flashing between 0 ¨ 5V) and there is no noise appearing in
the waveform.
OK
Yes
Yes
NG
Code No. 22 Input shaft speed sensor system check
(Refer to P.23-14.)
Code No. 23 Output shaft speed sensor system check
(Refer to P.23-15.)
Replace the input shaft speed sensor.
Check the trouble symptoms.
A/T overhaul L
D Replace the underdrive clutch retainer.
Check the trouble symptoms.
Probable cause
D Malfunction of the input shaft speed sensor
D Malfunction of the output shaft speed sensor
D Malfunction of the underdrive clutch retainer
D Malfunction of the transfer drive gear or driven gear
D Malfunction of the low and reverse brake system
D Malfunction of the reverse clutch system
D Noise generated
L
: Refer to the Transmission Workshop Manual.
NG
NG
Measure output waveform from the output shaft speed sensor.
(using an oscilloscope)
D Connect the connector A-82 and measure voltage between
32 and 43 at the A/T-ECU.
D Engine: 2,000 r/min (approx. 50 km/h)
D Selector lever position: 3
(Voltage)
OK:
A waveform such as the one shown on P.23-43(Inspection
Procedure Using an Oscilloscope) is output (flashing between 0 ¨ 5V) and there is no noise appearing in
the waveform.
OK
A/T overhaul L
D Low and reverse brake system check
(No. 41 or no diagnosis code is output).
D Reverse clutch system check (No diagnosis code is output).
NG
Eliminate the cause of the noise.
Replace the output shaft speed sensor.
Check the trouble symptoms.
NG
A/T overhaul L
D Replace the transfer drive gear and driven gear.
Check the trouble symptoms.
NG
Eliminate the cause of the noise.
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