AUTOMATIC TRANSMISSION ± Troubleshooting <A/T>
23-24
INSPECTION PROCEDURE 12
Lockup abnormality
Probable cause
When lockup does not operate even though in the lockup range, and also when
lockup is operating and the engine is idling but then stalls.
D Malfunction of torque converter
D Malfunction of valve body
D Malfunction of A/T-ECU
L: Refer to the Transmission Workshop Manual.
Is a normal diagnosis code output?
No
To Inspection Chart For Diagnosis
Code (Refer to P. 23-9.)
Yes
Check the solenoid valve No. 3.
NG
Replace the solenoid valve No. 3. L
OK
Check the lockup control valve.
NG
Replace the lockup control valve. L
OK
Replace the torque converter. L
Check the trouble symptoms.
NG
Replace the A/T-ECU.
INSPECTION PROCEDURE 13
Abnormal engine braking
Probable cause
Engine braking effectiveness is poor after downshifting has occurred. D Malfunction of overdrive clutch
D Malfunction of brake No. 1, No. 3
D Malfunction of valve body
D Malfunction of A/T-ECU
L: Refer to the Transmission Workshop Manual.
Poor braking in 1st, 2nd and 3rd gears
Yes
Check the overdrive clutch system. L
No
Poor braking in 1st gear
Yes
Check the slippage in R range
OK
Malfunction of low modulator valve. L
No
NG
Check the brake No. 1 system. L
Check the brake No. 3 system. L
Check the trouble symptoms.
NG
Replace the A/T-ECU.
To Next Page
Loading...
