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 D. to D3 when changing overdrive control switch to OFF position.

1. CHECK OVERDRIVE CONTROL SWITCH CIRCUIT
With CONSULT-II





Does "TCM INPUT SIGNALS" in Data Monitor show damage to overdrive control switch circuit?

Without CONSULT-II
Does self-diagnosis show damage to overdrive control switch circuit?
Yes or No
Yes >> Check overdrive control switch circuit. Refer to "21. TCM Self-diagnosis Does Not Activate (PNP, Overdrive Control and Throttle Position Switches Circuit Checks); DIAGNOSTIC PROCEDURE".
No >> Go to "10. A/T Does Not Shift: D2 -> D3".