A/T Does Not Shift: D4-D3, When 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-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 "Overdrive Control Switch".
No >> Go to "10. A/T Does Not Shift: D2 -> D3".