Four-Wheel Drive Does Not Disengage

Four-Wheel Drive Does Not Disengage

Circuit Description
The front axle control circuit consists of an electric motor actuator which engages and disengages the front axle. The front axle actuator consists of the following components within the actuator assembly:
^ A permanent magnetic (PM) motor
^ A worm gear controlled plunger
^ A front axle switch
^ An electronic control circuit

The front axle actuator consists of the following circuits:
^ An ignition 3 voltage circuit
^ A ground circuit
^ An axle actuator control circuit
^ An axle switch signal circuit.

Whenever a shift to 4WD is selected, the transfer case switch engages the front axle by grounding the axle actuator control circuit.

Test Description

Steps 1-11:

The numbers below refer to the step numbers on the diagnostic table.
2. Tests for proper ignition 3 voltage to the front axle actuator.
3. Tests for proper ground at the front axle actuator.
4. Tests the axle actuator control circuit and transfer case switch for a short to ground.
5. Tests the axle actuator control circuit for a short to ground.