AUTOMATIC TRANSMISSION ± Troubleshooting <A/T>
23-18
INSPECTION PROCEDURE 3
Does not move forward only
Probable cause
When the engine is idling, the vehicle does not move forward even if the selector
lever is shifted from N to D, 2 or L range. In such cases, the cause is probably
a malfunction of the clutch or brake.
D Malfunction of forward clutch
D Malfunction of direct clutch
D Malfunction of one-way clutch No. 2
D Malfunction of brake No. 1, No. 2, No. 3
D Malfunction of A/T-ECU
L: Refer to the Transmission Workshop Manual.
Does not vehicle move forward in D,
2 and L range?
No
Check the forward clutch. L
Yes
Does not vehicle move forward in D
and 2 range?
No
Check one-way clutch No. 2. L
Yes
Does not vehicle move forward in 2
range?
No
Check the brake No. 3. L
Yes
Which is the drive gear in D range?
2nd
Check the brake No. 1, No. 2. L
3rd
Check the direct clutch. L
Check the trouble symptoms.
NG
Replace the A/T-ECU.
INSPECTION PROCEDURE 4
Does not reverse only
Probable cause
When the engine is idling, the vehicle does not reverse even if the selector lever
is shifted from N to R range. In such cases, the cause is probably a malfunction
of a clutch, brake or the valve body.
D Malfunction of brake No. 1, No. 3
D Malfunction of direct clutch
D Malfunction of valve body
D Malfunction of planetary gear
D Malfunction of A/T-ECU
L: Refer to Transmission Workshop Manual.
Check the drive gear in D range.
2nd
Check the brake No. 1. L
1st
3rd
Check the planetary gear. L
Does the A/T shift up to 2nd gear?
No
Malfunction of 1-2 shift valve. L
Yes
Is there any slippage in 3rd gear in
D range?
NG
Check the direct clutch. L
OK
Check the brake No. 3. L
Check the trouble symptoms.
NG
Replace the A/T-ECU.
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