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DI-971
DIAGNOSTICS - AUTOMATIC TRANSMISSION (A750E for 1GR-FE)
DIDV0-01
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 3 chapters.
1. Chapter 1: Electronic Circuit Matrix Chart
S Refer to the table below when the trouble cause is considered to be electrical.
S 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.
S If the trouble still occurs even though there are no abnormalities in any of the other circuits, check and
replace the ECM.
HINT:
*1: When the circuit on which mark *1 is attached is defective, DTC could be output (see page DI-991).
Symptom Suspect Area See page
1. Shift solenoid valve (S1) circuit *1 DI-1058
No up-shift
2. Shift solenoid valve (S2) circuit *1 DI-1063
(A particular gear, from 1st to 4th gear, is not up-shifted)
3. ECM IN-30
1. O/D main switch circuit DI-1102
2. Engine coolant temp. sensor circuit *1 DI-57
3. Speed sensor NT circuit *1 DI-1008
No up-shift (4th 5th) 4. Shift solenoid valve (SL1) circuit *1 DI-1020
5. Shift solenoid valve (SL2) circuit *1 DI-1048
6. Shift solenoid valve (SR) circuit *1 DI-1068
7. ECM IN-30
1. Engine coolant temp. sensor circuit *1 DI-57
No up-shift (3rd 4th) 2. Shift solenoid valve (S2) circuit *1 DI-1063
3. ECM IN-30
1. Shift position L switch circuit DI-1105
No up-shift (1st 2nd) 2. Shift solenoid valve (S2) circuit *1 DI-1063
3. ECM IN-30
1. O/D main switch circuit DI-1102
2. Shift solenoid valve (SL1) circuit *1 DI-1020
No down-shift (5th 4th) 3. Shift solenoid valve (SL2) circuit *1 DI-1048
4. Shift solenoid valve (SR) circuit *1 DI-1068
5. ECM IN-30
1. Shift position L switch circuit DI-1105
No down-shift (2nd 1st) 2. Shift solenoid valve (S2) circuit *1 DI-1063
3. ECM IN-30
1. Shift solenoid valve (S1) circuit *1 DI-1058
No down-shift
2. Shift solenoid valve (S2) circuit *1 DI-1063
(A particular gear, from 1st to 4th gear, is not down-shifted)
3. ECM IN-30
1. ATF temperature sensor circuit *1 DI-999
2. Stop light switch circuit *1 DI-1017
3. Speed sensor NT circuit *1 DI-1008
No lock-up
4. Shift solenoid valve (SLU) circuit *1 DI-1097
5. Engine coolant temp. sensor circuit *1 DI-57
6. ECM IN-30
1. Shift solenoid valve (SLU) circuit *1 DI-1097
No lock-up off
2. ECM IN-30
DI-972
DIAGNOSTICS - AUTOMATIC TRANSMISSION (A750E for 1GR-FE)
1. Shift solenoid valve (SLT) circuit *1 DI-1079
2. Speed sensor NT circuit *1 DI-1008
3. Speed sensor SP2 circuit *1 DI-1013
Shift point too high or too low
4. Throttle position sensor circuit *1 DI-57
5. ATF temperature sensor circuit *1 DI-999
7. ECM IN-30
1. O/D main switch circuit DI-1102
Up-shift to 5th from 4th while shift lever is in 4 position
2. ECM IN-30
1. Engine coolant temp. sensor circuit *1 DI-57
Up-shift to 5th from 4th while engine is cold
2. ECM IN-30
1. Park/neutral position switch circuit *1 DI-993
Up-shift to 4th from 3rd while shift lever is in 3 position
2. ECM IN-30
1. Park/neutral position switch circuit *1 DI-993
Up-shift to 3rd from 2nd while shift lever is in 2 position
2. ECM IN-30
1. Shift position L switch circuit DI-1105
Up-shift to 2nd from 1st while shift lever is in L position
2. ECM IN-30
1. Speed sensor NT circuit *1 DI-1008
2. Shift solenoid valve (SL1) circuit *1 DI-1020
Harsh engagement (N D)
3. Shift solenoid valve (SLT) circuit *1 DI-1079
4. ECM IN-30
1. Speed sensor NT circuit *1 DI-1008
2. Speed sensor SP2 circuit *1 DI-1013
Harsh engagement (Lock-up)
3. Shift solenoid valve (SLU) circuit *1 DI-1097
4. ECM IN-30
Harsh engagement (Any driving position) ECM IN-30
1. ATF temperature sensor No.2 circuit *1 DI-1083
2. Engine coolant temp. sensor circuit *1 DI-57
Poor acceleration
3. Shift solenoid valve (SLT) circuit *1 DI-1079
4. ECM IN-30
No engine braking ECM IN-30
No kick-down ECM IN-30
1. Shift solenoid valve (SLU) circuit *1 DI-1079
Engine stalls when starting off or stopping
2. ECM IN-30
AT Oil Temp. warning light remains on 1. ATF temperature sensor No.2 circuit *1 1 DI-1083
Lock-up at 3rd gear 2. Engine coolant temp. sensor circuit
tem . *1 DI 57
DI-57
Shift point too high 3. ECM IN-30
1. Park/neutral position switch circuit *1 DI-993
Malfunction in shifting
2. ECM IN-30
DI-973
DIAGNOSTICS - AUTOMATIC TRANSMISSION (A750E for 1GR-FE)
Chapter 2: On-Vehicle Repair
(L: A750E, A750F AUTOMATIC TRANSMISSION Repair Manual Pub. No. RM999U)
Symptom Suspect Area See page
1. Transmission control cable DI-952
Vehicle does not move with shift lever in any forward position and 2. Manual valve L
reverse position 3. Parking lock pawl L
4. Off-vehicle repair matrix chart -
1. Valve body assy AT-12
Vehicle does not move with shift lever in R position
2. Off-vehicle repair matrix chart -
1. Valve body assy AT-12
No up-shift (1st 2nd)
2. Off-vehicle repair matrix chart -
1. Valve body assy AT-12
No up-shift (2nd 3rd)
2. Off-vehicle repair matrix chart -
1. Valve body assy AT-12
No up-shift (3rd 4th)
2. Off-vehicle repair matrix chart -
1. Valve body assy AT-12
No up-shift (4th 5th)
2. Off-vehicle repair matrix chart -
1. Valve body assy AT-12
No down-shift (5th 4th)
2. Off-vehicle repair matrix chart -
1. Valve body assy AT-12
No down-shift (4th 3rd)
2. Off-vehicle repair matrix chart -
1. Valve body assy AT-12
No down-shift (3rd 2nd)
2. Off-vehicle repair matrix chart -
1. Valve body assy AT-12
No down-shift (2nd 1st)
2. Off-vehicle repair matrix chart -
1. Shift solenoid valve (SLU) DI-1089
No lock-up or No lock-up off 2. Valve body assy AT-12
3. Off-vehicle repair matrix chart -
1. Shift solenoid valve (SL1) DI-1020
2. Valve body assy AT-12
Harsh engagement (N D)
3. C1 accumulator L
4. Off-vehicle repair matrix chart -
1. Shift solenoid valve (SLU) DI-1089
Harsh engagement (Lock-up) 2. Valve body assy AT-12
3. Off-vehicle repair matrix chart -
1. Shift solenoid valve (SLT) DI-1073
2. Shift solenoid valve (SLU) DI-1089
Harsh engagement (N R) 3. Valve body assy AT-12
4. C3 accumulator L
5. Off-vehicle repair matrix chart -
1. Shift solenoid valve (SLT) DI-1073
Harsh engagement (1st 2nd 3rd 4th 5th) 2. Shift solenoid valve (SL1) DI-1020
3. Valve body assy AT-12
1. Valve body assy AT-12
Harsh engagement (1st 2nd) 2. B3 accumulator L
3. Off-vehicle repair matrix chart -
1. Valve body assy AT-12
Harsh engagement (2nd 3rd) 2. C3 accumulator L
3. Off-vehicle repair matrix chart -
1. Valve body assy AT-12
Harsh engagement (3rd 4th) 2. C2 accumulator L
3. Off-vehicle repair matrix chart -
DI-974
DIAGNOSTICS - AUTOMATIC TRANSMISSION (A750E for 1GR-FE)
1. Shift solenoid valve (SL1) DI-1020
2. Shift solenoid valve (SL2) DI-1042
Harsh engagement (4th 5th)
3. Valve body assy AT-12
4. Off-vehicle repair matrix chart -
1. Shift solenoid valve (SL1) DI-1020
2. Shift solenoid valve (SL2) DI-1042
Harsh engagement (5th 4th)
3. Valve body assy AT-12
4. Off-vehicle repair matrix chart -
1. Transmission control cable DI-952
2. Valve body assy AT-12
Slip or shudder (Forward and reverse)
3. Oil strainer AT-12
4. Off-vehicle repair matrix chart -
1. Valve body assy AT-12
No engine braking (1st: L position)
2. Off-vehicle repair matrix chart -
1. Valve body assy AT-12
No engine braking (2nd: 2 position)
2. Off-vehicle repair matrix chart -
No kick-down Valve body assy AT-12
1. Shift solenoid valve (SLT) DI-1073
Shift point too high or too low 2. Shift solenoid valve (SL1) DI-1020
3. Valve body assy AT-12
1. Shift solenoid valve (SLT) DI-1073
Poor acceleration
2. Valve body assy AT-12
1. Shift solenoid valve (SLU) DI-1089
Engine stalls when starting off or stopping
2. Valve body assy AT-12
DI-975
DIAGNOSTICS - AUTOMATIC TRANSMISSION (A750E for 1GR-FE)
Chapter 3: Off-Vehicle Repair
(L: A750E, A750F AUTOMATIC TRANSMISSION Repair Manual Pub. No. RM999U)
Symptom Suspect Area See page
Vehicle does not move with shift lever in any forward position and 1. Rear planetary gear unit L
reverse position 2. Torque converter clutch AT-39
1. Brake No. 4 (B4) L
Vehicle does not move with shift lever in R position 2. Clutch No. 3 (C3) L
3. One-way clutch No.4 (F1) L
1. Brake No. 3 (B3) L
No up-shift (1st 2nd) 2. One-way clutch No.1 (F1) L
3. One-way clutch No. 2 (F2) L
No up-shift (2nd 3rd) Clutch No. 3 (C3) L
No up-shift (3rd 4th) Clutch No. 2 (C2) L
1. Brake No. 1 (B1) L
No up-shift (4th 5th)
2. Clutch No. 1 (C1) L
No lock-up or No lock-up off Torque converter clutch AT-39
1. Clutch No. 1 (C1) L
Harsh engagement (N D)
2. One-way clutch No.3 (F3) L
1. Clutch No. 3 (C3) L
Harsh engagement (N R) 2. Brake No. 4 (B4) L
3. One-way clutch No.1 (F1) L
1. Brake No. 3 (B3) L
Harsh engagement (1 2) 2. One-way clutch No.1 (F1) L
3. One-way clutch No. 2 (F2) L
Harsh engagement (2 3) Clutch No. 3 (C3) L
Harsh engagement (3 4) Clutch No. 2 (C2) L
1. Brake No. 1 (B1) L
Harsh engagement (4 5th)
2. Clutch No. 1 (C1) L
Harsh engagement (Lock-up) Torque converter clutch AT-39
1. One-way clutch No.1 (F1) L
Slip or shudder (Forward and reverse: After warm-up) 2. Clutch No. 3 (C3) L
3. Torque converter clutch clutch L
Slip or shudder (Particular position: Just after engine starts) Torque converter clutch AT-39
1. Brake No. 4 (B4) L
Slip or shudder (R position) 2. One-way clutch No.1 (F1) L
3. Clutch No. 3 (C3) L
1. Clutch No. 1 (C1) L
Slip or shudder (1st)
2. One-way clutch No.3 (F3) L
1. Clutch No. 1 (C1) L
2. Brake No. 3 (B3) L
Slip or shudder (2nd)
3. One-way clutch No.1 (F1) L
4. One-way clutch No.2 (F2) L
1. Clutch No. 1 (C1) L
Slip or shudder (3rd) 2. Clutch No. 3 (C3) L
3. One-way clutch No.1 (F1) L
1. Clutch No. 1 (C1) L
Slip or shudder (4th)
2. Clutch No. 2 (C2) L
1. Clutch No. 2 (C2) L
Slip or shudder (5th) 2. Clutch No. 3 (C3) L
3. Brake No. 1 (B1) L
No engine braking (1st - 4th: D position) Clutch No. 1 (C1) L
DI-976
DIAGNOSTICS - AUTOMATIC TRANSMISSION (A750E for 1GR-FE)
No engine braking (1st: L position) Brake No. 4 (B4) L
No engine braking (2nd: 2 position) Brake No. 2 (B2) L
No engine braking (3rd: 3 position) Brake No. 1 (B1) L
Poor acceleration (All positions) Torque converter clutch AT-39
1. Clutch No. 1 (C1) L
2. Clutch No. 3 (C3) L
Poor acceleration (5th)
3. Brake No. 1 (B1) L
4. Front planetary gear unit L
Engine stalls when starting off or stopping Torque converter clutch AT-39
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