| Condition | Possible Cause | Action |
|---|---|---|
|
Poor 4 → 3 shift
|
Shift solenoid valve-B circuit faulty
|
Inspect circuit for open, short and intermittent. If NG, repair.
|
|
Pressure control solenoid valve circuit faulty
|
Inspect circuit for open, short and intermittent. If NG, repair.
|
|
|
Timing solenoid valve circuit faulty
|
Inspect circuit for open, short and intermittent. If NG, repair.
|
|
|
Output shaft speed sensor circuit faulty
|
Inspect circuit for open, short and intermittent. If NG, repair.
|
|
|
Input shaft speed sensor circuit faulty
|
Inspect circuit for open, short and intermittent. If NG, repair.
|
|
|
CAN communication circuit faulty
(M13 engine model with VVT)
|
Inspect circuit for open, short and intermittent. If NG, repair.
|
|
|
Throttle position signal circuit faulty
(M13 engine model without VVT)
|
Inspect circuit for open, short and intermittent. If NG, repair.
|
|
|
Throttle position sensor circuit faulty
|
Inspect circuit for open, short and intermittent. If NG, repair.
|
|
|
O/D off switch circuit faulty
|
Refer to
No Gear Shift to 4th Gear
.
|
|
|
TCM
|
Substitute a known-good TCM and recheck.
|
|
|
ECM
|
Substitute a known-good ECM and recheck.
|