Pinpoint Test E: The Four-Wheel Drive (4WD) System Jumps Out of Gear

Four Wheel Drive (4WD) Systems - Electronic Shift

Pinpoint Tests

Pinpoint Test E: The Four-Wheel Drive (4WD) System Jumps Out of Gear

Refer to Wiring Diagram Set 34, Four-Wheel Drive System for schematic and connector information. Diagrams By Number

Normal Operation

Once the Four-Wheel Drive (4WD) system engages the user selected mode, that mode should be maintained. If the 4WD system does not stay in the selected position systematically check the 4WD system components.

This pinpoint test is intended to diagnose the following:
- Mode Select Switch (MSS)
- Transfer case

PINPOINT TEST E: THE 4WD SYSTEM JUMPS OUT OF GEAR

-------------------------------------------------
E1 VERIFY THE CONCERN

- Drive the vehicle and attempt to duplicate the concern.
- Is the concern an uncommanded range shift (in or out of LOW range)?

Yes
GO to E4.

No
GO to E2.

-------------------------------------------------
E2 CHECK THE 4WD SWITCH STATUS (4WD_SW) PID

- Ignition OFF.
- Connect the scan tool.
- Ignition ON.
- Drive the vehicle.
- Monitor the 4WD_SW PID while driving the vehicle in each shift position.
- Does the 4WD_SW PID always agree with the switch position?

Yes
GO to E3.

No
GO to Pinpoint Test C. Pinpoint Test C: The Vehicle Does Not Shift Between 2-Wheel Drive (2WD) and Four-Wheel Drive (4WD) Modes Correctly

-------------------------------------------------
E3 CHECK FOR DTCs

- Carry out the on-demand self test.
- Are DTCs present?

Yes
REFER to the 4X4 Control Module DTC Chart. Diagnostic Trouble Code Tests and Associated Procedures

No
GO to Pinpoint Test G. Pinpoint Test G: Electronic Shift-On-The-Fly (ESOF) Functional Test

-------------------------------------------------
E4 CHECK THE 4WD INDICATORS

- Stop the vehicle.
- Transmission in NEUTRAL.
- Observe the 4WD indicators in the Instrument Cluster (IC) while cycling through each MSS position.
- Do the 4WD indicators match MSS switch positions?

Yes
GO to E2.

No
GO to E5.

-------------------------------------------------
E5 CHECK FOR DTCs

- Transmission in PARK.
- Carry out the on-demand self test.
- Are DTCs present?

Yes
REFER to the 4X4 Control Module DTC Chart. Diagnostic Trouble Code Tests and Associated Procedures

No
CHECK the transfer case fluid level. REFER to Transfer Case Procedures. If the fluid level is OK, CHECK for internal transfer case faults. REFER to Transfer Case Overhaul.

-------------------------------------------------