P1811

P1801, P1811 Power Supply Circuit for Transfer Control Unit

Description
The transfer control unit controls the transfer control device which controls shifts between 4H and 4LO and between 2WD and 4WD. When the vehicle battery is removed, the power supply to the transfer control unit is interrupted, and self-diagnosis memory function is suspended. These DTC's may also set when the power supply voltage for the transfer control unit is abnormally low while driving.

DTC Logic

DTC DETECTION LOGIC





DTC CONFIRMATION PROCEDURE

Step 1:

Diagnosis Procedure

Step 1:

Step 1:

Step 1:

Step 1:

Steps 1-4:

Step 4:

Component Inspection
1) Turn ignition switch "OFF". (Stay for at least 5 seconds.)
2) Remove transfer shut off relay 1 and transfer shut off relay 2.
3) Apply 12V direct current between transfer shut off relay terminals 1 and 2.




4) Check continuity between relay terminals 3 and 5.




5) If inspection results are not normal, replace the transfer shut off relay 1 or 2.