Test S: The Vehicle Does Not Shift Between AWD and 4H Modes Correctly

Pinpoint Test S: The Vehicle Does Not Shift Between All Wheel Drive (AWD) and 4H Modes Correctly

Refer to Vehicle/Diagrams, Four Wheel Drive Systems for schematic and connector information.

Normal Operation

With the key in the ON position, the 4X4 control module (PCM) receives the operator's choice of 4WD selection from the mode select switch (MSS). The 4X4 control module (PCM) then controls the electric clutch. If the transfer case is not responding to the operator's intentions, systematically check all inputs and outputs to the 4X4 control module (PCM).






This pinpoint test is intended to diagnose the following:

^ 4H indicator
^ Transfer case
^ 4X4 control module (PCM)
^ Circuits
^ Transfer case clutch
^ Ignition switch and/or circuitry
^ High-speed controller area network (HS-CAN)
^ Instrument cluster (IC)
^ MSS

S1-S4:

S5-S7:

S8-S11:

S12-S14:

S15-S17:

S18-S19:

S20-S21: