GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Isuzu 🢒 2007 🢒 Isuzu MD F-Series 🢒 Driveline/Axle 🢒 Rear Drive Axle 🢒 Differential Lock Switch Replacement

Removal Procedure
  1. Apply the parking brake.
  2. Block the vehicle wheels.
  3. Drain all of the air reservoirs. Refer to Air Brake Reservoir Draining .

    4. Object Number: 203047 Size: MH

    Important: Tag the air lines for later installation.

  4. Remove the air lines at the differential lock control valve. Refer to Hose and Line Replacement - Nylon Push-In Type Fitting .

    5. Object Number: 203048 Size: SH
  5. Disconnect the wiring harness connector.
  6. Remove the following components from the differential lock control valve:
    7. • The nuts
    • The washers
    • The bolts
    • The differential lock control valve

Installation Procedure
  1. Install the differential lock control valve.

    2. Notice: Refer to Fastener Notice in the Preface section.

  2. Install the following components to the differential lock control valve:
    3. • The bolts
    • The washers
    • The nuts

    Tighten
    Tighten the nuts to 13 N·m (115 lb in).


    Object Number: 203048 Size: SH
  3. Connect the wiring harness connector.

    4. Object Number: 203047 Size: MH
  4. Install the air lines at the differential lock control valve. Refer to Hose and Line Replacement - Nylon Push-In Type Fitting .
  5. Start the engine.
  6. Inspect for air leaks. Refer to Air Brake System Testing .
  7. Verify proper operation of the inter-axle differential lock.
  8. Remove the wheel blocks.