TROUBLE DIAGNOSES — Diagnostic Procedure 12
AT-57flowchartA/T (Automatic Transmission) specific diagnostic procedure. Figures reference SAT762B, SAT909B, SAT121B.
Diagnostic Procedure 12
SYMPTOM: A/T does not perform lock-up at the specified speed.
Diagnostic Procedure 12 — A/T does not perform lock-up at the specified speed
1
Does self-diagnosis show damage to lock-up solenoid circuit after cruise test?
Yes
Check lock-up solenoid circuit. — Refer to "Self-diagnosis".
No
2
Check throttle sensor. — Refer to section EF & EC.
N.G.
Repair or replace throttle sensor.
O.K.
3
1. Remove control valve. — Refer to "ON-VEHICLE SERVICE".
2. Check following items.
• Lock-up control valve
• Shuttle shift valve D
• Torque converter relief valve
• Lock-up solenoid
• Pilot valve
• Pilot filter
N.G.
Repair or replace damaged parts.
O.K.
4
Check again.
N.G.
1. Perform A/T control unit input/output signal inspection.
1. Perform A/T control unit input/output signal inspection.
2. If N.G., recheck A/T control unit pin terminals for damage or connection of A/T control unit harness connector.
O.K.
INSPECTION END