DTC 001

DTC 001






CIRCUIT DESCRIPTION
The transfer case shift control module normally has battery voltage supplied to it at all times through the battery positive voltage circuit (CKT 40). When the ignition is ON, the transfer case shift control module conducts a self-test to determine if it retains the same memory it had 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, which would result in clearing DTC's 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 five times.

TEST DESCRIPTION
The numbers below 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 ground.