DTC P1A51[13] Mode Switch Circuit (4WD models)

1. DTC P1A51[13] description

The 4WD switch is installed to the center console or front console. The 2H signal circuit turns ON when the 4WD switch is in the 2H position, and the TCCM recognizes that the 4WD switch is in the 2H position. The 4H signal circuit turns ON when the 4WD switch is in the 4H position, and the TCCM recognizes that the 4WD switch is in the 4H position. Both the 2H signal circuit and 4H signal circuit turn ON when the 4WD switch is in the 4L position, and the TCCM recognizes that the 4WD switch is in the 4L position. The TCCM drives the transfer actuator to shift the gear position inside the transfer to the 4WD switch position operated by the driver. If the TCCM detects that both the 2H signal circuit and the 4H signal circuit are OFF, this DTC is set.

2. Condition for setting DTC P1A51[13]

Condition for running the DTC

The battery voltage is 10 to 16 V.

Condition for setting the DTC

The TCCM detects that both the 2H signal circuit and the 4H signal circuit are OFF.

3. Action taken when DTC P1A51[13] sets

The TCCM illuminates the check 4WD warning light when the diagnostic runs and fails.
The transfer position is retained. (It varies depending on the location of the open circuit.)
The TCCM is reset after the ignition switch turns OFF.