Flow of Diagnosis (Start Here)

Important:
- Prior to performing the electronic shift system functional test, perform a TCCM diagnostic test to ensure the TCCM is operating properly.
- If DTC 4 is stored in the TCCM memory, replace the TCCM.

1. The following is information that may help you understand some of the terminology used in the diagnostic tables:
- Ignition switch to the "RUN" position. (Position the ignition switch from "OFF" to "RUN" but do not start the engine).
- Ground source. (Any exposed metal surface on the vehicle connected directly or indirectly to the negative terminal of the battery).
- Shift select. (The selector that positions or shifts the automatic transmission or transfer case).
- Blinking. (Flashing light passing through the red plastic shift select buttons).
- Shift the transfer case. (Press one of the three shift select buttons to shift the transfer case into either "2HI", "4HI", or "4LO".

NOTICE: Perform the electronic shift functional test as described In diagnostic table 1. Table 1 - Functional Test
If required, follow the diagnostic tables to isolate any problem(s). Make any repairs that are necessary to correct the operation of electric shift system. After making repairs, clear the TCCM memory and perform the functional test to ensure the electric shift system operates properly.