A/T Does Not Shift: D4->D3, When O/D Control Switch
17. A/T Does Not Shift: D4 -> D3, When Overdrive Control Switch ON -> OFFSYMPTOM: A/T does not shift from D4 to D3 when changing overdrive control switch to OFF position.
1. CHECK OVERDRIVE 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 {Park/neutral Position (PNP), Overdrive Control and Throttle Position Sensor [Accelerator Pedal Position (APP) Sensor] Switches Circuit Checks}".
No >> Go to "10. A/T Does Not Shift: D2 -> D3".