Lexus IS250 IS220d GSE20 ALE20 - A960E AUTOMATIC TRANSMISSION

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.

Chapter 1:

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

HINT:

*1: When the circuit is detective, a DTC may be output.

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

LEXUS IS250, IS220d / GSE20 ALE20

A960E AUTOMATIC TRANSMISSION

Lexus IS250 IS220d GSE20 ALE20

AUTOMATIC TRANSMISSION SYSTEM