Toyota Yaris 2007 User Manual

U340E AUTOMATIC TRANSAXLE – AUTOMATIC TRANSAXLE SYSTEM	AX–1

AUTOMATIC TRANSAXLE

SYSTEM

PRECAUTION

NOTICE:

•Perform the RESET MEMORY (AT initialization) when replacing the automatic transaxle assembly, engine assembly or ECM (See page AX-14).

•Perform the REGISTRATION (VIN registration) when

replacing the ECM (See page ES-13).

HINT:

The RESET MEMORY cannot be completed by only disconnecting the battery cable.

CAUTION:

When using compressed air, always aim away from yourself to prevent Automatic Transmission Fluid (ATF) or kerosene from spraying on your face.

NOTICE:

•The automatic transaxle is composed of high precision parts which need careful inspection before reassembly. Even a small nick could cause fluid leakage or affect the performance. The instructions here are organized so that you work on only one component group at a time. This will help avoid confusion caused by similar-looking parts of different

sub-assemblies being on your workbench at the same time. The component groups are inspected and repaired from the converter housing side. As far as

possible, complete the inspection, repair and AX reassembly before proceeding to the next component group. If a defect is found in a certain component

group during reassembly, inspect and repair that group immediately. If a component group cannot be assembled because some parts are on order, be sure to keep all parts of the group in a separate container while proceeding with disassembly, inspection, repair and reassembly of other component groups.

•When changing the automatic transmission fluid, use only "Toyota Genuine ATF WS" (ATF JWS3324 or NWS9638).

•All disassembled parts should be washed clean and any fluid passages and holes should be blown through with compressed air.

•Dry all parts with compressed air. Never use a shop rag or a piece of cloth to dry them.

•Only recommended ATF or kerosene should be used for cleaning.

•After cleaning, the parts should be arranged in the correct order for efficient inspection, repair, and reassembly.

•When disassembling a valve body, be sure to match each valve with the corresponding spring.

AX–2

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U340E AUTOMATIC TRANSAXLE – AUTOMATIC TRANSAXLE SYSTEM

•New brake and clutch discs that are to be used for replacement must be soaked in ATF for at least 15 minutes before reassembly.

•All oil seal rings, clutch discs, clutch plates, rotating parts, and sliding surfaces should be coated with ATF prior to reassembly.

•All gaskets and rubber O-rings should be replaced with new ones.

•Do not apply adhesive cements to gaskets or similar parts.

•Make sure that the ends of snap rings are not aligned with any cutouts and are installed in the grooves correctly.

•When replacing a worn bushing, the sub-assembly containing the bushing must also be replaced.

•Check thrust bearings and races for wear and damage. Replace them as necessary.

•When working with FIPG material, you must observe the following:

–Using a razor blade and a gasket scraper, remove all the old packing (FIPG) material from the gasket surface.

–Clean both sealing surfaces with a non-residue solvent.

–Parts must be reassembled within 10 minutes of application. Otherwise, the packing (FIPG) material must be removed and reapplied.

	U340E AUTOMATIC TRANSAXLE – AUTOMATIC TRANSAXLE SYSTEM		AX–3
		DEFINITION OF TERMS
	Term	Definition
	Monitor description	Description of what the ECM monitors and how it detects malfunctions (monitoring purpose and its details).
	Related DTCs	A group of diagnostic trouble codes that are output by the ECM based on the same malfunction detection
		logic.
		Preconditions that allow the ECM to detect malfunctions.
	Typical enabling conditions	With all preconditions satisfied, the ECM sets the DTC when the monitored value(s) exceeds the
		malfunction threshold(s).
		The priority order that is applied to monitoring, if multiple sensors and components are used to detect the
	Sequence of operation	malfunction.
		While one sensor is being monitored, the next sensor or component is not monitored until the current
		monitoring is concluded.
	Required sensor/components	The sensors and components that are used by the ECM to detect malfunctions.
		The number of times that the ECM checks for malfunctions per driving cycle.
	Frequency of operation	"Once per driving cycle" means that the ECM detects malfunctions only one time during a single driving
		cycle.
		"Continuous" means that the ECM detects malfunctions every time the enabling conditions are met.
	Duration	The minimum time that the ECM must sense a continuous deviation in the monitored value(s) before
		setting a DTC. This timing begins when the typical enabling conditions are met.
	Malfunction thresholds	Beyond this value, the ECM concludes that there is a malfunction and sets a DTC.
		MIL illumination timing after a defect is detected.
		"Immediate" means that the ECM illuminates the MIL the instant the ECM determines that there is a
	MIL operation	malfunction.
		"2 driving cycle" means that the ECM illuminates the MIL if the same malfunction is detected again in the
		next driving cycle.
		Normal operating ranges of sensors and solenoids under normal driving conditions.
	Component operating range	Use these ranges as references.
		They cannot be used to judge if a sensor or solenoid is defective or not.

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AX–4	U340E AUTOMATIC TRANSAXLE – AUTOMATIC TRANSAXLE SYSTEM

PARTS LOCATION

			COMBINATION METER
			- MIL (MALFUNCTION INDICATOR LAMP)
	STOP LIGHT SWITCH
			SHIFT LOCK CONTROL ECU
	DLC3
	(DATA LINK CONNECTOR 3)
	TRANSMISSION WIRE	ECM	VEHICLE SPEED SENSOR
	(ATF TEMPERATURE SENSOR)
AX			TRANSMISSION REVOLUTION
			SENSOR (SPEED SENSOR (NT))
	PARK / NEUTRAL
	POSITION SWITCH
	SHIFT SOLENOID VALVE S2		SHIFT SOLENOID VALVE SLU
			SHIFT SOLENOID VALVE SLT
	SHIFT SOLENOID VALVE S1
	SHIFT SOLENOID VALVE ST
			C130143E01

U340E AUTOMATIC TRANSAXLE – AUTOMATIC TRANSAXLE SYSTEM	AX–5

SYSTEM DIAGRAM

The configuration of the electronic control system in the

U340E automatic transaxle is as shown in the following chart.

	ECM		Stop Light Switch
		ST1-	STOP
		STP	Stop Light
IGN
To IG2 Relay	IGSW		Shift Lock Control ECU
	STAR
		ODMS
To Ignition Switch
			To Gauge Fuse
Park/Neutral Position Switch			Park/Neutral Position Switch
		P
ST		R
	STA	N
		D
Starter
		2
ST		L		AX
ETCS
	+BM		Electronically Controlled Transmission
			Solenoid
EFI			Shift Solenoid Valve SLU
	BATT	SLU+
		SLU-
To C/OPN Relay	+B		Shift Solenoid Valve SLT
		SLT+
	+B2	SLT-	Shift Solenoid Valve S1
MAIN	MREL
EFI		S1
			Shift Solenoid Valve S2
Battery	E1	S2
			Shift Solenoid Valve ST
	E01
	E02	ST
		THO1
		ETHO
			ATF Temperature Sensor
			C130145E01

AX–6	U340E AUTOMATIC TRANSAXLE – AUTOMATIC TRANSAXLE SYSTEM

To MET Fuse	Transmission Revolution Sensor
	(Speed Sensor NT)
Combination Meter	NT+
	NT-
	W
	SPD
	TACH
To ECU-IG	DLC3
	TC
Fuse
	CANH
Vehicle Speed Sensor	CANL
	To CAN BUS
AX	C130144E01

U340E AUTOMATIC TRANSAXLE – AUTOMATIC TRANSAXLE SYSTEM	AX–7

SYSTEM DESCRIPTION

1.SYSTEM DESCRIPTION

(a)The ECT (Electronic Controlled automatic Transmission/Transaxle) is an automatic transmission/transaxle that electronically controls shift timing using the ECM. The ECM detects electrical signals that indicate engine and driving conditions, and controls the shift point, based on driver habits and road conditions. As a result, fuel efficiency and power transmission/transaxle performance are improved.

Shift shock has been reduced by controlling the engine and transmission simultaneously.

In addition, the ECT has features such as the following:

•Diagnostic function

•Fail-safe function when a malfunction occurs

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AX–8	U340E AUTOMATIC TRANSAXLE – AUTOMATIC TRANSAXLE SYSTEM

HOW TO PROCEED WITH TROUBLESHOOTING

HINT:

• The ECM of this system is connected to the CAN communication system. Therefore, before starting troubleshooting, be sure to check that there is no trouble in the CAN communication system.

• The intelligent tester can be used in steps 3, 4, 6, and 9.

1Vehicle Brought to Workshop

NEXT

2Customer Problem Analysis

NEXT

3Connect Intelligent Tester to DLC3

NEXT

4Check and Clear DTCs and Freeze Frame Data

				HINT:
				(See page AX-25).
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		NEXT
		5	Visual Inspection
		NEXT
		6	Setting Check Mode Diagnosis
				HINT:
				(See page AX-26).

NEXT

7 Problem Symptom Confirmation

HINT:

(See page AX-9).

Symptom does not occur: Go to step 8 Symptom occurs: Go to step 9

U340E AUTOMATIC TRANSAXLE – AUTOMATIC TRANSAXLE SYSTEM	AX–9

8 Symptom Simulation

HINT:

(See page IN-26).

NEXT

9 DTC Check

HINT:

(See page AX-25).

DTC is not output: Go to step 10 DTC is output: Go to step 17

10 Basic Inspection

HINT:

(See page AX-93, AX-106 and AX-107).

NG		Go to step 19

OK

11 Mechanical System Test

HINT:

(See page AX-11).

NG		Go to step 16

OK

12 Hydraulic Test

HINT:

(See page AX-13).

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NG		Go to step 16

OK

13 Manual Shifting Test

HINT:

(See page AX-14).

NG		Go to step 15

OK

AX–10	U340E AUTOMATIC TRANSAXLE – AUTOMATIC TRANSAXLE SYSTEM

14 Problem Symptoms Table Chapter 1

HINT:

(See page AX-17).

NG		Go to step 18

OK

15 Problem Symptoms Table Chapter 2

HINT:

(See page AX-17).

NEXT

16 Part Inspection

Go to step 19

17 DTC Chart

HINT:

(See page AX-32).

NEXT

AX 18 Circuit Inspection

NEXT

19Repair or Replace

NEXT

20Confirmation Test

NEXT

End

U340E AUTOMATIC TRANSAXLE – AUTOMATIC TRANSAXLE SYSTEM	AX–11

ROAD TEST

1.	PROBLEM SYMPTOM CONFIRMATION
	(a) Based on the result of the customer problem
	analysis, try to reproduce the symptoms. If the
	problem is that the transaxle does not shift up, shift
	down, or the shift point is too high or too low,
	conduct the following road test referring to the
	automatic shift schedule and simulate the problem
	symptoms.
2.	PERFORM ROAD TEST
	NOTICE:
	Perform the test at the ATF (Automatic Transmission
	Fluid) temperature 50° to 80 °C (122° to 176 °F) in the
	normal operation.
	(a) D position test
	Shift into the D position, fully depress the
	accelerator pedal and check the following points.
	(1) Check up-shift operation.
	Check that 1st to 2nd, 2nd to 3rd and 3rd to 4th
	up-shifts take place, and that the shift points
	conform to the automatic shift schedule (See
	page SS-19).
	HINT:
	4th Gear Up-shift Prohibition Control
	• Engine coolant temperature is 60 °C (140 °F)
	or less.
	• ATF temperature is 10 °C (50 °F) or less.
	4th Gear Lock-up Prohibition Control
	• Brake pedal is depressed.
	• Accelerator pedal is released.
		AX
	• Engine coolant temperature is 60 °C (140 °F)

or less.

• ATF temperature is 10 °C (50 °F) or less.

(2) Check for shift shock and slippage.

Check for shock and slippage when up-shifting from 1st to 2nd, 2nd to 3rd and 3rd to 4th.

(3) Check for abnormal noises and vibration. Check for abnormal noise and vibration when up-shifting from 1st to 2nd, 2nd to 3rd and 3rd to 4th while driving with the shift lever in the D position, and also check while driving in the lockup condition.

HINT:

The cause of abnormal noises and vibration must be checked very thoroughly as it could also cause loss of balance in parts, such as the differential and torque converter.

		AX–12	U340E AUTOMATIC TRANSAXLE – AUTOMATIC TRANSAXLE SYSTEM
				(4) Check kick-down operation.
				Check the possible kick-down vehicle speeds
				when the 2nd to 1st, 3rd to 2nd and 4th to 3rd
				kick-downs take place while driving with the shift
				lever in the D position. Confirm that each takes
				place within the applicable vehicle speed range
				indicated in the automatic shift schedule (See
				page SS-19).
				(5) Check for abnormal shock and slippage during
				kick-down.
				(6) Check the lock-up mechanism.
				• Drive in the D position (4th gear) at a
				constant speed (lock-up ON) of
				approximately 37 mph (60 km/h).
				• Lightly depress the accelerator pedal and
				check that the engine speed does not change
				abruptly.
				HINT:
				• There is no lock-up function in the 1st, 2nd
				and 3rd gears in the D position.
				• If there is a sudden increase in engine speed,
				lock-up has not occurred.
			(b)	3 position test
				Shift into the 3 position, fully depress the accelerator
				pedal and check the following points:
				(1) Check the transmission control switch operation.
				While driving in the D position (4th gear), shift
				the shift lever into the 3 position, and check that
				the 4th to 3rd down-shift takes place.
				(2) Check up-shift operation.
				Check that the 1st to 2nd and 2nd to 3rd up-
AX
				shifts take place, and that the shift points
				conform to the automatic shift schedule (See
				page SS-19).
				HINT:
				There is no 3rd to 4th up-shift in the 3 position.
				(3) Check engine braking.
				While driving in the 3 position and 3rd gear,
				release the accelerator pedal and check the
				engine braking effect.
			(c)	2 position test
				Shift into the 2 position and fully depress the

accelerator pedal and check the following points.

(1) Check up-shift operation.

Check that the 1st to 2nd up-shift takes place and that the shift point conforms to the automatic shift schedule (See page SS-19).

HINT:

There is no lock-up function in the 2 position.

(2) Check engine braking.

While driving in the 2 position and 2nd gear, release the accelerator pedal and check the engine braking effect.

U340E AUTOMATIC TRANSAXLE – AUTOMATIC TRANSAXLE SYSTEM	AX–13

(3)Check for abnormal noises during acceleration and deceleration, and for shock during up-shift and down-shift.

(d)L position test

Shift into the L position, fully depress the accelerator pedal and check the following points.

(1)Check that no up-shift takes place.

While driving in the L position, check that there is no up-shift to 2nd gear.

(2)Check engine braking.

While driving in the L position, release the accelerator pedal and check the engine braking effect.

(3)Check for abnormal noises during acceleration and deceleration.

(e)R position test

Shift into the R position, fully depress the accelerator pedal and check for slippage.

CAUTION:

Before conducting this test, ensure that the test area is free from people and obstructions.

(f)P position test

Stop the vehicle on a slope (more than 5°), shift into the P position and release the parking brake. Check that the vehicle does not move.

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AX–14	U340E AUTOMATIC TRANSAXLE – AUTOMATIC TRANSAXLE SYSTEM
	MECHANICAL SYSTEM TESTS

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Evaluation:

1.STALL SPEED TEST

HINT:

This test is to check the overall performance of the engine and transaxle by measuring the stall speeds in the D position.

NOTICE:

•Do not perform the stall speed test for longer than 5 seconds.

•To ensure safety, perform this test in a wide, clear level area which provides good traction.

•The stall speed test must always be carried out by pairs of technicians. One technician must watch the wheels and wheel stoppers from outside the

vehicle to make sure they do not slip, while the other performs the test.

(a)Connect the intelligent tester to the DLC3.

(b)Run the vehicle until the ATF (Automatic Transmission Fluid) temperature reaches 50° to 80°C (122° to 176°F).

(c)Allow the engine to idle with the air conditioning OFF.

(d)Chock all 4 wheels.

(e)Set the parking brake and keep the brake pedal firmly depressed with your left foot.

(f)Shift the shift lever to the D position.

(g)Depress the accelerator pedal all the way down with your right foot.

(h)Read the engine rpm (stall speed) and release the accelerator pedal immediately.

Standard value: 1,850 to 2,450 rpm

	Test Result	Possible Cause
		• Stator one-way clutch is not operating properly
	Stall speed is lower than standard value	• Torque converter is faulty (Stall speed is less than standard value
		by 600 rpm or more.)
		• Engine power is insufficient
		• Line pressure is too low
	Stall speed is higher than standard value	• Forward clutch (C1) is slipping
		• No. 2 one-way clutch (F2) is not operating properly

2. SHIFT TIME LAG TEST

HINT:

This test is to check the conditions of the direct clutch, forward clutch, 1st brake and reverse brake.

(a) Connect the intelligent tester to the DLC3.

(b) Run the vehicle until the ATF (Automatic Transmission Fluid) temperature reaches 50° to 80°C (122° to 176°F).

(c) Allow the engine to idle with the air conditioning OFF.

(d) Set the parking brake and keep the brake pedal firmly depressed with your left foot.

U340E AUTOMATIC TRANSAXLE – AUTOMATIC TRANSAXLE SYSTEM	AX–15

(e)Check the D range time lag.

(1)Shift the shift lever into the N position and wait for 1 minute. (*1)

(2)Shift the shift lever into the D position and measure the time until the shock is felt. (*2)

(3)Repeat procedures (*1) and (*2) three times, and calculate the average time of the three tests.

(f)Check the R range time lag.

(1)Shift the shift lever into the N position and wait for 1 minute. (*3)

(2)Shift the shift lever into the R position and measure the time until the shock is felt. (*4)

(3)Repeat procedures (*3) and (*4) three times, and calculate the average time of the three tests.

Standard value:

D range time lag is less than 1.2 seconds R range time lag is less than 1.5 seconds

Evaluation :

	Test Result		Possible Cause
			• Line pressure is too low
	D range time lag exceeds standard value		• Forward clutch (C1) is worn
			• No. 2 one-way clutch (F2) is not operating properly
			• Line pressure is too low
	R range time lag exceeds standard value		• Reverse clutch (C3) is worn
			• 1st and reverse brake (B3) is worn
		HYDRAULIC TEST

1.PERFORM HYDRAULIC TEST

				(a) Measure the line pressure.
				NOTICE:
						AX
				•	Perform the test at the normal operating ATF
					(Automatic Transmission Fluid) temperature
					50° to 80°C (122° to 176°F).
				• The line pressure test must always be carried
					out by pairs of technicians. One technician
		G024063E02
					must observe the condition of the wheels and
					wheel stoppers outside the vehicle, while the
					other is performing the test.

• Prevent the SST hose from interfering with the exhaust pipe.

• This test must be conducted after checking and adjusting the engine.

• Perform this test with the air conditioning OFF.

• Do not continue the stall test for more than 5 seconds.

(1)Warm up the ATF.

(2)Lift the vehicle up.

(3)Remove the engine under cover.

(4)Remove the test plug on the transmission case center right side and connect SST.

SST 09992-00095 (09992-00231, 0999200271)

(5) Connect the intelligent tester to the DLC3.

AX–16	U340E AUTOMATIC TRANSAXLE – AUTOMATIC TRANSAXLE SYSTEM

(6) Fully apply the parking brake and chock all 4 wheels.

(7) Start the engine and check the idling speed.

(8) Keep your left foot pressing firmly on the brake pedal and shift into the D position.

(9) Measure the line pressure when the engine is idling.

(10)Depress the accelerator pedal all the way down. Quickly read the highest line pressure when engine speed reaches stall speed.

(11)Perform the test in the R position in the same manner.

Standard line pressure

	Condition	D position kPa (kgf / cm2, psi)	R position kPa (kgf / cm2, psi)
	Idling	372 to 412 kPa	553 to 623 kPa
		(3.8 to 4.2 kgf/cm2, 54 to 60 psi)	(5.6 to 6.4 kgf/cm2, 80 to 90 psi)
	Stall	1,126 to 1,226 kPa	1,664 to 1,864 kPa
		(11.5 to 12.5 kgf/cm2, 163 to 178 psi)	(17.0 to 19.0 kgf/cm2, 241 to 270 psi)

Evaluation:

		Problem		Possible Cause
		Measured values are higher than specified values in all positions	• Shift solenoid valve SLT defective
			•	Regulator valve defective
			• Shift solenoid valve SLT defective
		Measured values are lower than specified values in all positions	•	Regulator valve defective
			•	Oil pump defective
		Pressure is low in D position only	• D position circuit fluid leak
			•	Forward clutch defective
			• R position circuit fluid leak
		Pressure is low in R position only	•	Reverse clutch defective
			• 1st and reverse brake defective
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U340E AUTOMATIC TRANSAXLE – AUTOMATIC TRANSAXLE SYSTEM	AX–17

C117640E01

MANUAL SHIFTING TEST

1.PERFORM MANUAL SHIFTING TEST

HINT:

•This test can be used to determine whether the trouble is occurring in the electrical circuit or is a mechanical problem in the transaxle.

•If any abnormalities are found in the following test, the problem is in the transaxle itself.

(a)Disconnect the transmission wire connector. HINT:

It is possible to deactivate the electrical shift control by disconnecting the transmission wire. In this way, it is possible to change gear positions by mechanical shift change using the shift lever.

(b)Drive with the transmission wire disconnected. Shift the shift lever into each position to check whether the gear position changes as shown in the table below.

Shift Position	Shifting Condition
D	3rd
3	3rd
2	3rd
L	3rd
R	Reverse
P	Pawl Lock

(c)Connect the transmission wire connector.

(d)Clear the DTC (See page AX-25).

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AX–18	U340E AUTOMATIC TRANSAXLE – AUTOMATIC TRANSAXLE SYSTEM

AX

INITIALIZATION

1.RESET MEMORY NOTICE:

•Perform the RESET MEMORY (AT initialization) when replacing the automatic transaxle assembly, engine assembly or ECM.

•The RESET MEMORY can only be performed

using an intelligent tester.

HINT:

The ECM stores the conditions that the ECT controls the automatic transaxle assembly and engine assembly in accordance with those characteristics. Therefore, when the automatic transaxle assembly, engine assembly, or ECM is replaced, it is necessary to reset the memory so that the ECM can store the new information.

The reset procedure is as follows.

(a)Turn the ignition switch off.

(b)Connect the intelligent tester to the DLC3.

(c)Turn the ignition switch to the ON position and push the intelligent tester main switch on.

(d)Select the following items: DIAGNOSIS / ENHANCED OBD II.

(e)Perform the reset memory procedure from the ENGINE menu.

CAUTION:

After performing the RESET MEMORY, be sure to perform the ROAD TEST (See page AX-9) as described earlier.

HINT:

The ECM stores learned values by performing the ROAD TEST.

(1) Tester menu flow:

U340E AUTOMATIC TRANSAXLE – AUTOMATIC TRANSAXLE SYSTEM	AX–19

C130151

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AX–20	U340E AUTOMATIC TRANSAXLE – AUTOMATIC TRANSAXLE SYSTEM

AX

MONITOR DRIVE PATTERN

1.MONITOR DRIVE PATTERN FOR ECT TEST

(a)Perform this drive pattern as one method to simulate the detection conditions of ECT malfunctions. (The DTCs may not be detected due to the actual driving conditions. And some DTCs may not be detected through this drive pattern.) HINT:

Preparation for driving

•Warm up the engine. (Engine coolant temperature is 60°C (140°F) or higher.)

•Drive the vehicle when the atmospheric temperature is -10°C (14°F) or higher. (Malfunction is not detected when the

atmospheric temperature is less than -10°C (14°F).)

Driving note

•Drive the vehicle through all gears.

Stop → 1st → 2nd → 3rd → 4th (lock-up ON).

•Repeat the above driving pattern three times or

more.

NOTICE:

•The monitor status can be checked using the intelligent tester. When using an intelligent tester, monitor status can be found in the ENHANCED OBD II / DATA LIST or under CARB OBD II.

•In the event that the drive pattern must be interrupted (possibly due to traffic conditions

or other factors), the drive pattern can be resumed and, in most cases, the monitor can be completed.

CAUTION:

Perform this drive pattern on as level a road as possible and strictly observe the posted speed limits and traffic laws while driving.

U340E AUTOMATIC TRANSAXLE – AUTOMATIC TRANSAXLE SYSTEM	AX–21

Vehicle Speed

Maintain constant speed or gradual acceleration (with throttle open) for 3 minutes or more.*1

Lock-up ON Approximately Vehicle Speed 62 mph (100 km/h)

Approximately 50 mph (80 km/h)

	0
	Warmed up	Stop (Idling)
	sufficiently
		Normal acceleration through all
		gears from 1st to 4th

G031593E14

HINT:

*1: Drive at such a speed in the uppermost gear, to engage lock-up. The vehicle can be driven at a

speed lower than that in the above diagram under AX the lock-up condition.

NOTICE:

To detect DTC P0711 (ATF temperature sensor malfunction), drive the vehicle for approximately 30 minutes.

AX–22	U340E AUTOMATIC TRANSAXLE – AUTOMATIC TRANSAXLE SYSTEM

PROBLEM SYMPTOMS TABLE

HINT:

• If a normal code is displayed during the DTC check although the trouble still occurs, check the electrical circuits for each symptom in the order given in the following charts and proceed to the page given for troubleshooting.

• The Matrix Chart is divided into 2 chapters.

• When the circuit on which *1 is attached malfunctions, a DTC could be output.

Chapter 1: Electronic Circuit Matrix Chart

Refer to the table below when the trouble cause is considered to be electrical. If the trouble still occurs even though there are no abnormalities in any of the other circuits, then check and replace the ECM.

		Symptom		Suspected area	See page
		No up-shift (Particular gear, from 1st to 3rd gear, is not	ECM		IN-34
		up-shifted)
		No up-shift (From 3rd to 4th)	1.	Shift lock control unit circuit	AX-47
			2.	ECM	IN-34
		No down-shift (From 4th to 3rd)	1.	Shift lock control unit circuit	AX-47
			2.	ECM	IN-34
		No down-shift (Particular gear, from 1st to 3rd gear, is	ECM		IN-34
		not down-shifted)
			1.	Stop light switch circuit *1	ES-48
			2.	Engine coolant temperature sensor circuit *1	ES-48
			3.	Vehicle speed sensor circuit *1	ES-48
			4.	Speed sensor (NT) circuit *1	AX-50
		No lock-up or No lock-up off	5.	ATF temperature sensor circuit *1	AX-42
			6.	Shift solenoid valve S1 *1	AX-67
			7.	Shift solenoid valve S2 *1	AX-71
AX
			8.	Shift solenoid valve SLU *1	AX-89
			9.	Throttle position sensor circuit *1	ES-48
			10. ECM		IN-34
		Shift point too high or too low	1.	Throttle position sensor circuit *1	ES-48
			2.	ECM	IN-34
		Up-shift to 2nd while in L position	ECM		IN-34
		Up-shift to 3nd while in 2 position	ECM		IN-34
			1.	Shift lock control unit circuit	AX-47
		Up-shift from 3rd to 4th in 3 position	2. Park/neutral position switch *1		AX-35
			3.	ECM	IN-34
		Up-shift from 3rd to 4th while engine is cold	1.	Engine coolant temperature sensor circuit *1	ES-48
			2.	ECM	IN-34
		Harsh engagement (From N to D)	1.	Park/neutral position switch *1	AX-35
			2.	ECM	IN-34
		Harsh engagement (From 3rd to 4th)	1.	Shift solenoid valve ST *1	AX-63
			2.	ECM	IN-34
		Harsh engagement (Lock-up)	1.	Shift solenoid valve SLU *1	AX-89
			2.	ECM	IN-34
		Harsh engagement (Any driving position)	1.	Throttle position sensor circuit *1	ES-48
			2.	ECM	IN-34
		Poor acceleration	ECM		IN-34
		No kick-down	ECM		IN-34

	U340E AUTOMATIC TRANSAXLE – AUTOMATIC TRANSAXLE SYSTEM			AX–23
	Symptom		Suspected area	See page
	Engine stalls when starting off or stopping	ECM		IN-34
		1.	Park/neutral position switch *1	AX-35
	Malfunction in shifting	2. Shift lock control unit circuit		AX-47
		3.	ECM	IN-34
	Chapter 2: On-Vehicle Repair and Off-Vehicle Repair
	Symptom		Suspected area	See page
		1.	Manual valve	AX-253
		2.	Valve body assembly	AX-113
	Vehicle does not move in any forward positions or in R	3.	Planetary gear unit	AX-173
		4.	Forward clutch (C1)	AX-173
	position
		5.	No. 2 one-way clutch (F2)	AX-173
		6.	Reverse clutch (C3)	AX-173
		7.	1st and reverse brake (B3)	AX-173
		1.	Manual valve	AX-253
		2.	Valve body assembly	AX-113
	Vehicle does not move in R position	3. Planetary gear unit		AX-173
		4.	Reverse clutch (C3)	AX-173
		5.	1st and reverse brake (B3)	AX-173
		1.	Valve body assembly	AX-113
	No up-shift (From 1st to 2nd)	2. 2nd brake (B2)		AX-173
		3.	No. 1 one-way clutch (F1)	AX-173
	No up-shift (From 2nd to 3rd)	1.	Valve body assembly	AX-113
		2.	Direct clutch (C2)	AX-173
	No up-shift (From 3rd to 4th)	1.	Valve body assembly	AX-113
		2.	O/D and 2nd brake (B1)	AX-173
	No down-shift (From 4th to 3rd)	Valve body assembly		AX-113
	No down-shift (From 3rd to 2nd)	Valve body assembly		AX-113
							AX
	No down-shift (From 2nd to 1st)	Valve body assembly		AX-113
	No lock-up or No lock-up off	1.	Valve body assembly	AX-113
		2.	Torque converter clutch	AX-171
		1.	Valve body assembly	AX-113
	Harsh engagement (From N to D)	2. Forward clutch (C1)		AX-173
		3.	No. 2 one-way clutch (F2)	AX-173
	Harsh engagement (Lock-up)	1.	Valve body assembly	AX-113
		2.	Torque converter clutch	AX-171
		1.	Valve body assembly	AX-113
	Harsh engagement (From N to R)	2.	C3 accumulator	AX-173
		3.	Reverse clutch (C3)	AX-173
		4.	1st and reverse brake (B3)	AX-173
		1.	B2 accumulator	AX-173
	Harsh engagement (From 1st to 2nd)	2.	Valve body assembly	AX-113
		3.	2nd brake (B2)	AX-173
		4.	No. 1 one-way clutch (F1)	AX-173
		1.	C2 accumulator	AX-173
	Harsh engagement (From 2nd to 3rd)	2. Valve body assembly		AX-113
		3.	Direct clutch (C2)	AX-173
		1.	Shift solenoid valve ST	AX-63
	Harsh engagement (From 3rd to 4th)	2. Valve body assembly		AX-113
		3.	O/D and 2nd brake (B1)	AX-173

		AX–24	U340E AUTOMATIC TRANSAXLE – AUTOMATIC TRANSAXLE SYSTEM
			Symptom		Suspected area	See page
		Harsh engagement (From 4th to 3rd)		1.	Shift solenoid valve ST	AX-63
				2.	Valve body assembly	AX-113
		Harsh engagement (D, 2, L position)		Valve body assembly		AX-113
				1.	Valve body assembly	AX-113
				2.	Oil strainer	AX-113
				3.	Torque converter clutch	AX-171
				4.	Forward clutch (C1)	AX-173
		Slippage or shuddering (Forward position)
				5. Direct clutch (C2)		AX-173
				6.	O/D and 2nd brake (B1)	AX-173
				7.	2nd brake (B2)	AX-173
				8.	No. 1 one-way clutch (F1)	AX-173
				9.	No. 2 one-way clutch (F2)	AX-173
				1.	Valve body assembly	AX-113
		Slippage or shuddering (R position)		2.	Oil strainer	AX-113
				3.	Reverse clutch (C3)	AX-173
				4.	1st and reverse brake (B3)	AX-173
		Slippage or shuddering (1st)		No. 2 one-way clutch (F2)		AX-173
		Slippage or shuddering (2nd)		1.	2nd brake (B2)	AX-173
				2.	No.1 one-way clutch (F1)	AX-173
		Slippage or shuddering (3rd)		Direct clutch (C2)		AX-173
		Slippage or shuddering (4th)		O/D and 2nd brake (B1)		AX-173
		No engine braking (1st: L position)		1.	Valve body assembly	AX-113
				2.	1st and reverse brake (B3)	AX-173
		No engine braking (2nd: 2 position)		1.	Valve body assembly	AX-113
				2.	2nd and O/D brake (B1)	AX-173
		No kick-down		Valve body assembly		AX-113
		Poor acceleration		1.	Valve body assembly	AX-113
AX
				2.	Torque converter clutch	AX-171
		Engine stalls when starting off or stopping		Torque converter clutch		AX-171

U340E AUTOMATIC TRANSAXLE – AUTOMATIC TRANSAXLE SYSTEM	AX–25

TERMINALS OF ECM

1.ECM

C20

A21

C105085E01

HINT:

Each ECM terminal's standard voltage is shown in the table below.

In the table, first follow the information under "Condition". Look under "Symbols (Terminal No.)" for the terminals to be inspected. The standard voltage between the terminals is shown under "Specific Condition".

Use the illustration above as a reference for the ECM terminals.

Symbols (Terminals No.)	Wiring Color	Terminal Description	Condition	Specified Condition
			Ignition switch ON and
				11 to 14 V		AX
			shift lever L position
		L shift position switch
L (C20-74) - E1 (C20-104)	V - W
			Ignition switch ON and
		signal
			shift lever other than L	Below 1 V
			position
			Ignition switch ON and	11 to 14 V
			shift lever 2 position
		2 shift position switch
2 (C20-55) - E1 (C20-104)	G - W
			Ignition switch ON and
		signal
			shift lever other than 2	Below 1 V
			position
			Ignition switch ON and	11 to 14 V
			shift lever 3 position
ODMS (A21-26) - E1		3 shift position switch
	O - W
			Ignition switch ON and
(C20-104)		signal
			shift lever other than 3	Below 1 V
			position
			Ignition switch ON and	11 to 14 V
			shift lever D or 3 position
		D shift position switch
D (C20-56) - E1 (C20-104)	L - W
			Ignition switch ON and
		signal
			shift lever other than D	Below 1 V
			and 3 positions
			Ignition switch ON and	11 to 14 V
			shift lever R position
		R shift position switch
R (C20-53) - E1 (C20-104)	R - W
			Ignition switch ON and
		signal
			shift lever other than R	Below 1 V
			position

			AX–26	U340E AUTOMATIC TRANSAXLE – AUTOMATIC TRANSAXLE SYSTEM
			Symbols (Terminals No.)		Wiring Color	Terminal Description	Condition	Specified Condition
							Ignition switch ON and	11 to 14 V
							shift lever N position
						N shift position switch
			N (C20-54) - E1 (C20-104)		SB - W
							Ignition switch ON and
						signal
							shift lever other than N	Below 1 V
							position
							Ignition switch ON and	11 to 14 V
							shift lever P position
						P shift position switch
			P (C20-73) - E1 (C20-104)		R - W
							Ignition switch ON and
						signal
							shift lever other than P	Below 1 V
							position
			NT+ (C20-125) - NT-		B - G	Speed sensor (NT) signal	Engine running	Pulse generation
			(C20-124)					(See waveform 1)
			STP (A21-36) - E1 (C20-		G - W	Stop light switch signal	Brake pedal depressed	7.5 to 14 V
			104)				Brake pedal released	Below 1.5 V
			SPD (A21-8) - E1 (C20-				Ignition switch ON and	Pulse generation
					V - W	Speed signal	driving wheel rotating
			104)					(See waveform 2)
							slowly
			S1 (C20-79) - E1 (C20-				Ignition switch ON	11 to 14 V
					SB - W	S1 solenoid signal	1st or 2nd gear	11 to 14 V
			104)
							3rd or 4th gear	Below 1 V
			S2 (C20-78) - E1 (C20-				Ignition switch ON	Below 1 V
					L - W	S2 solenoid signal	1st or 4th gear	11 to 14 V
			104)
							2nd or 3rd gear	Below 1 V
			ST (C20-80) - E1 (C20-		GR - W	ST solenoid signal	D position (3rd gear ←→	Below 1 V ←→ 11 to 14 V
			104)				4th gear)
			SLT+ (C20-76) - SLT-		G - W	SLT solenoid signal	Engine idling speed	Pulse generation
			(C20-75)					(See waveform 3)
			SLU+ (C20-57) - SLU-		P - O	SLU solenoid signal	Engine idling speed	Pulse generation
			(C20-77)					(See waveform 4)
			THO1 (C20-72) - ETHO			ATF (Automatic	ATF temperature: 10°C	4 to 0 V
					Y - B	Transmission Fluid)
AX			(C20-95)				(50°F) to 145°C (293°F)
						temperature sensor signal

							(a)	Waveform 1
		2 V/DIV
							Terminal		NT+ - NT-
							Tool setting		2 V/DIV, 1ms/DIV
							Vehicle conditions		Driving at approximately 12 mph (20 km/h)
		1 ms/DIV
				C053419E04			(b)	Waveform 2
		2 V/DIV
							Terminal		SPD - E1
							Tool setting		2 V/DIV, 20 ms/DIV
							Vehicle conditions		Driving at approximately 12 mph (20 km/h)

20 ms/DIV

C053421E04

			U340E AUTOMATIC TRANSAXLE – AUTOMATIC TRANSAXLE SYSTEM						AX–27
							(c) Waveform 3
					5 V/DIV
							Terminal	SLT+ - SLT-
							Tool setting	5 V/DIV, 1 ms/DIV
							Vehicle conditions	Engine idling speed

1 ms/DIV

C055887E01

		(d) Waveform 4
5 V/DIV
		Terminal	SLU+ - SLU-
		Tool setting	5 V/DIV, 1 ms/DIV
		Vehicle conditions	Engine idling speed

1 ms/DIV

C058033E01

AX

AX–28	U340E AUTOMATIC TRANSAXLE – AUTOMATIC TRANSAXLE SYSTEM

DIAGNOSIS SYSTEM

1.DESCRIPTION

(a)When troubleshooting OBD II vehicles, the only difference from the usual troubleshooting procedure is to connect an intelligent tester (complying with SAE J1987) to the vehicle, and read off various data output by the vehicle's ECM.

(b)OBD II regulations require that the vehicle's onboard computer illuminate the Malfunction Indicator Lamp (MIL) on the instrument panel when the computer detects a malfunction in the computer itself or in the drive system components which affect the vehicle emissions. In addition to illuminating the MIL when a malfunction is detected, the applicable

			DTCs prescribed by SAE J2012 are recorded in the
			ECM memory (See page AX-32).
		FI00534	If the malfunction does not occur in 3 consecutive
			trips, the MIL goes off but the DTCs remain in the
			ECM memory.
		(c)	To check the DTCs, connect the intelligent tester to
		Intelligent Tester	the DLC3 of the vehicle. The intelligent tester also
			enables you to erase the DTCs and check freeze
			frame data and various forms of engine data (For
			operating instructions, see the instruction book).
		(d)	The DTCs include SAE controlled codes and
			manufacturer controlled codes. SAE controlled
	DLC3	CAN VIM	codes must be set as prescribed by the SAE, while
			manufacturer controlled codes can be set freely by
AX		C115104E01	the manufacturer within the prescribed limits (See
		(e)	page AX-32).
			The diagnosis system operates in normal mode
			during normal vehicle use. In normal mode, 2-trip
			detection logic is used to ensure accurate detection
			of malfunctions. Check mode is also available to
			technicians as an option. In check mode, 1-trip
			detection logic is used for simulating malfunction
			symptoms and increasing the system's ability to
			detect malfunctions, including intermittent
			malfunctions.
		(f)	2-trip detection logic: When a malfunction is first
			detected, the malfunction is temporarily stored in
			the ECM memory (1st trip). If the ignition switch is
			turned off and then turned to the ON position again,
			and same malfunction is detected again, the MIL
			illuminates.

U340E AUTOMATIC TRANSAXLE – AUTOMATIC TRANSAXLE SYSTEM

AX–29

(g) Freeze frame data records the engine conditions,

such as fuel system, calculated load, engine coolant

temperature, fuel trim, engine speed and vehicle

speed when a malfunction is detected. When

troubleshooting, freeze frame data can help

determine if the vehicle was running or stopped, if

the engine was warmed up or not, if the air/fuel ratio

was lean or rich, and other data from the time the

malfunction occurred.

(h) The intelligent tester records freeze frame data in

five different instances: 1) 3 times before the DTC is

(Seconds)

set, 2) once when the DTC is set, and 3) once after

the DTC is set. These data can be used to simulate

0.5

0.5

0.5

the vehicle's conditions around the time when the

malfunction occurred. The data may help find the

cause of the malfunction, or judge if the DTC is

being caused by a temporary malfunction or not.

A092901E12

2.

INSPECT DLC3

DLC3

(a) The ECM uses ISO 15765-4 for communication.

The terminal arrangement of the DLC3 complies

CG

SG

CANH SIL

with SAE J1962 and matches the ISO 15765-4

format.

1

2

3

4

5

6

7

8

9 10 111213141516

CANL

BAT

A082779E81

AX

Symbols (Terminal No.)

Terminal Description

Condition

Specified Condition

SIL (7) - SG (5)

Bus "+" line

During transmission

Pulse generation

CG (4) - Body ground

Chassis ground

Always

Below 1 Ω

SG (5) - Body ground

Signal ground

Always

Below 1 Ω

BAT (16) - Body ground

Battery positive

Always

11 to 14 V

CANH (6) - CANL (14)

CAN bus line

Ignition switch OFF*

54 to 69 Ω

CANH (6) - CG (4)

HIGH-level CAN bus line

Ignition switch OFF*

200 Ω or higher

CANL (14) - CG (4)

LOW-level CAN bus line

Ignition switch OFF*

200 Ω or higher

CANH (6) - BAT (16)

HIGH-level CAN bus line

Ignition switch OFF*

6 kΩ or higher

CANL (14) - BAT (16)

LOW-level CAN bus line

Ignition switch OFF*

6 kΩ or higher

NOTICE:

*: Before measuring the resistance, leave the vehicle as is for at least 1 minute and do not operate the ignition switch, any other switches or the doors.

AX–30	U340E AUTOMATIC TRANSAXLE – AUTOMATIC TRANSAXLE SYSTEM

If the result is not as specified, the DLC3 may have a malfunction. Repair or replace the harness and connector.

HINT:

If your display shows UNABLE TO CONNECT TO VEHICLE when you have connected the cable of the intelligent tester to the DLC3, turned the ignition switch to the ON position and operated the tester, there is a problem with the vehicle or the tester.

• If the communication is normal when the tester is connected to another vehicle, inspect the DLC3 on the original vehicle.

• If the communication is still impossible when the tester is connected to another vehicle, the problem is probably in the tester itself. Consult the Service Department listed in the tester's instruction manual.

3.CHECK BATTERY VOLTAGE

(a)Measure the battery voltage.

Standard voltage: 11 to 14 V

If the voltage is below 11 V, replace the battery before proceeding.

4.CHECK MIL

(a)The MIL comes on when the ignition switch is turned to the ON position and the engine is not running.

HINT:

If the MIL does not light up, troubleshoot the

combination meter.

AX (b) When the engine is started, the MIL should go off. If the lamp remains on, it means that the diagnosis system has detected a malfunction or abnormality in the system.