AUTOMATIC TRANSMISSION ± Troubleshooting <A/T>
23-17
INSPECTION PROCEDURE 2
Does not move forward and reverse
Probable cause
When the engine is idling, the vehicle does not move forward and reverse even
if the selector lever is shifted from N to D, 2, L or R positionj. In such cases, the
cause is probably abnormal line pressure, or a malfunction of the transmission control
cable, torque converter, oil pump, parking mechanism or the power train.
D Malfunction of transmission control cable
D Abnormal line pressure
D Malfunction of power train
D Malfunction of oil pump
D Malfunction of valve body
D Malfunction of parking mechanism
D Malfunction of torque converter
D Malfunction of A/T-ECU
L: Refer to the Transmission Workshop Manual.
OK
Replace the torque converter. L
NG
Check and repair or replace the oil
pump. L
Check the trouble symptoms
Is abnormal noise generated in D
range?
Yes
Is the source of the abnormal noise
the torque converter or thetransmis-
sion?
Replace the torque converter L
Torque
converter
No
Transmission
Check the power train. L
D Disassemble the transmission,
check the condition of the planetary
gear and other parts, and repair or
replace any parts as necessary.
Can the propeller shaft be turned by
hand in all ranges except P range?
No
Malfunction of parking mechanism L
Yes
Check the line pressure.
(Refer to P. 23-45.)
NG
Repair or replace the valve body. L
Transmission control cable assembly
check
NG
NG
OK
OK
Check the engine control system, igni-
tion system, fuel system, engine me-
chanical system.
Repair, replace
Repair, replace
Check the trouble symptoms.
NG
Replace the A/T-ECU.
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