A/T Does Not Shift: D4->D3, W/ OD Control Switch ON->Off

17. A/T Does Not Shift: D4-> D3, When Overdrive Control Switch ON -> OFF

SYMPTOM:
^ A/T does not shift from D4 to D3 when changing overdrive control switch to OFF position.

1. CHECK OVERDRIVE CONTROL SWITCH CIRCUIT

With CONSULT
Does "TCM INPUT SIGNALS" in Data monitor show damage to overdrive control switch circuit?

Without CONSULT





Does self-diagnosis show damage to overdrive control switch circuit?

Yes or No
Yes >> Check overdrive control switch circuit. Refer to "DIAGNOSTIC PROCEDURE".
No >> Go to "10. A/T Does Not Shift: D2 -> D3".