Pinpoint Test 2: Vehicle Does Not Shift Between 2WD and 4WD Modes Correctly

TRANSFER CASE ELECTRONIC SHIFT PINPOINT TEST 2: VEHICLE DOES NOT SHIFT BETWEEN 2WD AND 4WD MODES CORRECTLY

Normal Operation
The mode select switch communicates the operators choice to the 4WD control module. The 4WD control module then control the transfer case shift motor as necessary. If the vehicle is not responding to the operators intentions systematically, check the necessary inputs and outputs of the 4WD control module, components of the transfer case and the halfshafts. Check all circuits for opens and shorts to voltage and ground.

Possible Causes
- Transfer case
- 4WD control module
- Front axle assembly
- Circuits:
^ Battery circuit SBP 28
^ Ground circuit GD161A (B/Y)
^ SJB fuse 28 (15A)
^ CCF13A (W/L)
^ RCF13A (W/BR)
^ CCF14A (G/O)
^ CCF15A (BR/Y)
^ CCF16A (V/G)
^ CCF17A (W/O)
^ RCF09B (BR/W)
^ CCF07A (BR/G)
^ CCF08A (GY/O)
- 4WD switch