A761E Automatic Transmission. Electronic Controlled Automatic Transmission System Problem Symptoms Table

Transmission. Lexus Gs430, Gs300. Uzs190 Grs190

A761E Automatic Transmission. Lexus Gs430, Gs300. Uzs190 Grs190

Electronic Controlled Automatic Transmission System -- Problem Symptoms Table

HINT:

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

The Matrix Chart is divided into 2 chapters.

Refer to the table below when the trouble cause is considered to be electrical.If the instruction "Proceed to next circuit inspection shown on matrix chart" is given in the flow chart of each circuit, proceed to the circuit with the next highest number in the table to continue the check.If the trouble still occurs even though there are no abnormalities in any of the other circuits, check and replace the ECM.

1. Chapter 1: Electronic Circuit Matrix Chart
Symptom	Suspected area	See page
No up-shift (1st -> 2nd)	1. Shift solenoid valve (S1) circuit *1	Click here
No up-shift (1st -> 2nd)	2. ECM	Click here
No up-shift (2nd -> 3rd)	1. Shift solenoid valve (S2) circuit *1	Click here
No up-shift (2nd -> 3rd)	2. ECM	Click here
No up-shift (3rd -> 4th)	1. Shift solenoid valve (S3) circuit *1	Click here
	2. Engine coolant temp. sensor circuit *1	Click here
	3. ECM	Click here
No up-shift (4th -> 5th)	1. Shift solenoid valve (S4) circuit *1	Click here
	2. Shift solenoid valve (SR) circuit *1	Click here
	3. Shift solenoid valve (SL1) circuit *1	Click here
	4. Shift solenoid valve (SL2) circuit *1	Click here
	5. ECM	Click here
No up-shift (5th -> 6th)	1. Park/neutral position switch circuit *1	Click here
	2. Engine coolant temp. sensor circuit *1	Click here
	3. Shift solenoid valve (S2) circuit *1	Click here
	4. ECM	Click here
No down-shift (6th -> 5th)	1. Park/neutral position switch circuit *1	Click here
	2. Shift solenoid valve (S2) circuit *1	Click here
	3. ECM	Click here
No down-shift (5th -> 4th)	1. Shift solenoid valve (S4) circuit *1	Click here
	2. Shift solenoid valve (SR) circuit *1	Click here
	3. Shift solenoid valve (SL1) circuit *1	Click here
	4. Shift solenoid valve (SL2) circuit *1	Click here
	5. ECM	Click here
No down-shift (4th -> 3rd)	1. Shift solenoid valve (S3) circuit *1	Click here
No down-shift (4th -> 3rd)	2. ECM	Click here
No down-shift (3rd -> 2nd)	1. Shift solenoid valve (S2) circuit *1	Click here
No down-shift (3rd -> 2nd)	2. ECM	Click here
No down-shift (2nd -> 1st)	1. Shift solenoid valve (S1) circuit *1	Click here
No down-shift (2nd -> 1st)	2. ECM	Click here
No lock-up or No lock-up off	1. Shift solenoid valve (SLU) circuit *1	Click here
	2. Stop light switch circuit *1	Click here
	3. ECM	Click here
No lock-up	1. Shift solenoid valve (SLU) circuit *1	Click here
	2. Engine coolant temp. sensor circuit *1	Click here
	3. Stop light switch circuit *1	Click here
	4. Speed sensor NT circuit *1	Click here
	5. ECM	Click here
No lock-up off	1. Shift solenoid valve (SLU) circuit *1	Click here
No lock-up off	2. ECM	Click here
Shift point too high or too low	1. Shift solenoid valve (SLT) circuit *1	Click here
	2. Speed sensor NT circuit *1	Click here
	3. Speed sensor SP2 circuit *1	Click here
	4. Throttle position sensor circuit *1	Click here
	5. Pattern select (PWR) switch circuit	Click here
	6. ATF temperature sensor circuit *1	Click here
	7. ECM	Click here
Up-shift to 4th from 3rd while engine is cold	1. Engine coolant temp. sensor circuit *1	Click here
Up-shift to 4th from 3rd while engine is cold	2. ECM	Click here
Up-shift to 5th from 4th while engine is cold	1. Engine coolant temp. sensor circuit *1	Click here
Up-shift to 5th from 4th while engine is cold	2. ECM	Click here
No gear change by shifting into "+" or "-" while the shifting lever is in the S position	1. Transmission control switch circuit	Click here
	2. ECM	Click here
Harsh engagement (N -> D)	1. Shift solenoid valve (SLT) circuit *1	Click here
	2. Speed sensor NT circuit *1	Click here
	3. ECM	Click here
Harsh engagement (Lock-up)	1. Speed sensor NT circuit *1	Click here
	2. Speed sensor SP2 circuit *1	Click here
	3. Shift solenoid valve (SLU) circuit *1	Click here
	4. ECM	Click here
Harsh engagement (Any driving position)	1. Throttle position sensor circuit *1	Click here
	2. Shift solenoid valve (SL1) circuit *1	Click here
	3. Shift solenoid valve (SL2) circuit *1	Click here
	4. Shift solenoid valve (SLU) circuit *1	Click here
	5. Shift solenoid valve (SLT) circuit *1	Click here
	6. Speed sensor NT circuit *1	Click here
	7. ECM	Click here
Poor acceleration	1. Shift solenoid valve (SLT) circuit *1	Click here
	2. Pattern select (SNOW) switch circuit *2	Click here
	3. ECM	Click here
No engine brake	ECM	Click here
No kick-down	1. Kick-down switch cricuit *3	Click here
No kick-down	2. ECM	Click here
Engine stalls when starting off or stopping	1. Shift solenoid valve (SLU) circuit *1	Click here
Engine stalls when starting off or stopping	2. ECM	Click here
ECT SNOW does not operate *2	1. Shift solenoid valve (SLT) circuit *1	Click here
	2. Pattern select (SNOW) switch circuit	Click here
	3. ECM	Click here
Malfunction in shifting	1. Park/neutral position switch circuit *1	Click here
	2. Transmission control switch circuit	Click here
	3. ECM	Click here
Harsh engagement (1st -> 2nd -> 3rd -> 4th -> 5th)	Shift solenoid valve (SR) circuit *1	Click here
Slip or shudder (5th -> 6th and 6th -> 5th)	Shift solenoid valve (SR) circuit *1	Click here

HINT:

*1: When the circuit on which mark *1 is attached is a malfunction, DTC could be output.
*2: w/ Snow mode switch
*3: Europe

2. Chapter 2: On-Vehicle Repair and Off-Vehicle Repair
Symptom	Suspected area	See page
Vehicle does not move in any forward position and reverse positions	1. Transmission control rod	Click here
	2. Manual valve	Click here
	3. Parking lock pawl	Click here
	4. Rear planetary gear unit	Click here
	5. Torque converter clutch	Click here
Vehicle does not move in R position	1. Valve body assembly	Click here
Vehicle does not move in R position	2. Brake No.4 (B4)	Click here
No up-shift (1st -> 2nd)	1. Valve body assembly	Click here
	2. Brake No.3 (B3)	Click here
	3. One-way clutch No.1 (F1)	Click here
	4. One-way clutch No.2 (F2)	Click here
No up-shift (2nd -> 3rd)	1. Valve body assembly	Click here
No up-shift (2nd -> 3rd)	2. Clutch No.3 (C3)	Click here
No up-shift (3rd -> 4th)	1. Valve body assembly	Click here
No up-shift (3rd -> 4th)	2. Clutch No.2 (C2)	Click here
No up-shift (4th -> 5th)	1. Valve body assembly	Click here
No up-shift (4th -> 5th)	2. Brake No.1 (B1)	Click here
No up-shift (5th -> 6th)	1. Valve body assembly	Click here
No up-shift (5th -> 6th)	2. Brake No.2 (B2)	Click here
No down-shift (6th -> 5th)	Valve body assembly	Click here
No down-shift (5th -> 4th)	Valve body assembly	Click here
No down-shift (4th -> 3rd)	Valve body assembly	Click here
No down-shift (3rd -> 2nd)	Valve body assembly	Click here
No down-shift (2nd -> 1st)	Valve body assembly	Click here
No lock-up or No lock-up off	1. Valve body assembly	Click here
No lock-up or No lock-up off	2. Torque converter clutch	Click here
Harsh engagement (N -> D)	1. Valve body assembly	Click here
	2. C1 accumulator	Click here
	3. Clutch No.1 (C1)	Click here
	4. One-way clutch No.3 (F3)	Click here
	5. One-way clutch No.4 (F4)	Click here
Harsh engagement (Lock-up)	1. Valve body assembly	Click here
Harsh engagement (Lock-up)	2. Torque converter clutch	Click here
Harsh engagement (N -> R)	1. Valve body assembly	Click here
	2. C3 accumulator	Click here
	3. Clutch No.3 (C3)	Click here
	4. Brake No.4 (B4)	Click here
	5. One-way clutch No.1 (F1)	Click here
Harsh engagement (1st -> 2nd -> 3rd -> 4th -> 5th -> 6th)	Valve body assembly	Click here
Harsh engagement (1st -> 2nd)	1. Valve body assembly	Click here
	2. B3 accumulator	Click here
	3. Brake No.3 (B3)	Click here
	4. One-way clutch No.1 (F1)	Click here
	5. One-way clutch No.2 (F2)	Click here
Harsh engagement (2nd -> 3rd)	1. Valve body assembly	Click here
	2. C3 accumulator	Click here
	3. Clutch No.3 (C3)	Click here
Harsh engagement (3rd -> 4th)	1. Valve body assembly	Click here
	2. C2 accumulator	Click here
	3. Clutch No.2 (C2)	Click here
Harsh engagement (4th -> 5th)	1. Valve body assembly	Click here
	2. B1 accumulator	Click here
	3. Brake No.1 (B1)	Click here
Harsh engagement (5th -> 6th)	1. Valve body assembly	Click here
	2. B2 accumulator	Click here
	3. Brake No.2 (B2)	Click here
Harsh engagement (6th -> 5th)	1. Valve body assembly	Click here
	2. C3 accumulator	Click here
	3. Clutch No.3 (C3)	Click here
Slip or shudder (Forward and reverse: After warm-up)	1. Valve body assembly	Click here
	2. Oil strainer	Click here
	3. One-way clutch No.1 (F1)	Click here
	4. Clutch No.3 (C3)	Click here
	5. Torque converter clutch	Click here
Slip or shudder (Particular position: Just after engine starts)	Torque converter clutch	Click here
Slip or shudder (R position)	1. Brake No.4 (B4)	Click here
	2. One-way clutch No.1 (F1)	Click here
	3. Clutch No.3 (C3)	Click here
Slip or shudder (1st)	1. Clutch No.1 (C1)	Click here
	2. One-way clutch No.3 (F3)	Click here
	3. One-way clutch No.4 (F4)	Click here
Slip or shudder (2nd)	1. Clutch No.1 (C1)	Click here
	2. Brake No.3 (B3)	Click here
	3. One-way clutch No.1 (F1)	Click here
	4. One-way clutch No.2 (F2)	Click here
	5. One-way clutch No.4 (F4)	Click here
Slip or shudder (3rd)	1. Clutch No.1 (C1)	Click here
	2. Clutch No.3 (C3)	Click here
	3. One-way clutch No.1 (F1)	Click here
	4. One-way clutch No.4 (F4)	Click here
Slip or shudder (4th)	1. Clutch No.1 (C1)	Click here
	2. Clutch No.2 (C2)	Click here
	3. One-way clutch No.4 (F4)	Click here
Slip or shudder (5th)	1. Clutch No.2 (C2)	Click here
	2. Clutch No.3 (C3)	Click here
	3. Brake No.1 (B1)	Click here
Slip or shudder (6th)	1. Clutch No.2 (C2)	Click here
Slip or shudder (6th)	2. Brake No.2 (B2)	Click here
No engine braking (1st +- 4th: S position)	Clutch No.4 (C4)	Click here
No engine braking (1st: 1 position)	1. Valve body assembly	Click here
No engine braking (1st: 1 position)	2. Brake No.4 (B4)	Click here
No engine braking (2nd: 2 position)	1. Valve body assembly	Click here
No engine braking (2nd: 2 position)	2. Brake No.2 (B2)	Click here
No engine braking (3rd: 3 position)	1. Valve body assembly	Click here
No engine braking (3rd: 3 position)	2. Brake No.1 (B1)	Click here
No engine braking (4th: 4 position)	Valve body assembly	Click here
No kick-down	Valve body assembly	Click here
Shift point too high or too low	Valve body assembly	Click here
Poor acceleration (All positions)	1. Valve body assembly	Click here
Poor acceleration (All positions)	2. Torque converter clutch	Click here
Poor acceleration (6th)	1. Brake No.2 (B2)	Click here
	2. Clutch No.2 (C2)	Click here
	3. Front planetary gear unit	Click here
Engine stalls when starting off or stopping	1. Valve body assembly	Click here
Engine stalls when starting off or stopping	2. Torque converter clutch	Click here