Test P: Transmission Four Wheel Drive (4X4) Mode Select Switch Failure

Pinpoint Test P: Transmission Four Wheel Drive (4X4) Mode Select Switch Failure

Normal Operation
The mode select switch (MSS) communicates the operator's choice to the 4X4 control module. The 4X4 control module controls the shift solenoid, transfer case motor and pulse vacuum hublocks (PVHs) as necessary. If the vehicle is not responding to the operator's intentions, systematically check the necessary inputs and outputs of the MSS and the 4X4 control module. Check all circuits for opens and shorts to power or ground.

This pinpoint test is intended to diagnose the following:
^ MSS
^ Circuitry
^ 4X4 control module

P1-P2:

P2 (Continued)-P4:

P4 (Continued)-P6:

P6 (Continued)-P7: