DTC 001

DTC 001

Test 1-7:

Circuit Description
The transfer case shift-control module normally has battery voltage supplied through the battery positive voltage circuit (CKT 40) at all times. When the ignition is ON, the transfer case shift control module conducts a self-test. This self-test determines if the current memory is the same memory that was retained when the ignition was last turned OFF. This self-test indicates whether the RAM standby power-supply to the transfer case shift control module pin C6 was interrupted. If the power is interrupted, the DTCs would be cleared from memory. If the self-test fails, the transfer case shift-control module sets DTC 1.

Conditions for Clearing the DTC
This DTC will clear when the voltage supply failure has been corrected and the ignition switch has been cycled 5 times.

Test Description
The numbers refer to the step numbers on the diagnostic table.
2. This step inspects the CTSY LP fuse for an open.
3. This step test the battery positive voltage circuit, CKT 40, for an open or high resistance.
4. This step rechecks the CTSY LP fuse for an open.
5. This step tests the battery positive voltage circuit, CKT 40, for a short to around.