TROUBLE DIAGNOSES
AT-58flowchartApplies to A/T (Automatic Transmission) equipped vehicles only.
Diagnostic Procedure 13
SYMPTOM: A/T does not hold lock-up condition for more than 30 seconds.
Diagnostic Procedure 13
1
Does self-diagnosis show damage to engine revolution signal circuit after cruise test?
Yes
Check engine revolution signal circuit. — Refer to "Self-diagnosis".
No
2
1. Remove oil pan.
2. Check A/T fluid condition.
O.K.
return to step 4
N.G.
3
1. Remove control valve assembly. — Refer to "ON-VEHICLE SERVICE".
2. Check the following items.
• Lock-up control valve
• Pilot valve
• Pilot filter
3. Disassemble A/T.
4. Check torque converter and oil pump assembly.
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
Diagnostic Procedure 14
SYMPTOM: Lock-up is not released when accelerator pedal is released.
Diagnostic Procedure 14
1
Does self-diagnosis show damage to idle switch circuit after cruise test?
Yes
Check idle switch circuit. — Refer to "Self-diagnosis".
No
2
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
See also
Self-diagnosis · ON-VEHICLE SERVICE