5A
Poor 4 → 3 shift
Trouble diagnosis 1
Electrical Repair
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
TCM
Substitute a known-good TCM and recheck.
ECM
Substitute a known-good ECM and recheck.