Reading Diagnostic Trouble Codes

Description:

READING DIAGNOSTIC TROUBLE CODES (DTCs)
To cause the transfer case switch status lamps to flash and indicate the DTC's:
1. Install a jumper wire between DLC terminals J and A, or between J and a good ground (figure 20).
2. Turn the ignition switch to the RUN position.
3. Wait approximately 3 seconds.
4. Observe the status lamps.

The transfer case status lamps flash to indicate the stored DTC's. If only one DTC is stored in the memory, that code flashes repeatedly with an approximately three-second delay between flash sequences (figure 20). If more than one DTC is stored, the first DTC flashes once, then an approximately 3-second delay occurs, then the next code is flashed. Such sequences continue until the jumper wire is disconnected.