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HOMESERVICE MANUALSCHEVROLET2003TRAILBLAZER 4.2 S, 4WDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 622 (ANTI-LOCK BRAKE SYSTEM)REPAIR INSTRUCTIONSWHEEL SPEED SENSOR JUMPER HARNESS REPLACEMENT - FRONT (LEFT)INSTALLATION PROCEDURE
2003 Chevrolet TrailBlazer 4.2 S, 4WD

Installation Procedure

2003 Chevrolet TrailBlazer 4.2 S, 4WDSECTION Installation Procedure
WARNING: This page is about a different car, the 2002 Oldsmobile Aurora. However, it is still accessible from the selected car via links, so may be relevant.
  1. Replace the wheel speed sensor jumper harness. Refer to WIRING REPAIRS in Wiring Repair.
  2. Route the wheel speed sensor jumper (1) through the engine compartment to the wheel well.
  3. If equipped with a 4.0L install the ground wire and bolt to the top of the transmission near the shift lever. Refer to TRANSAXLE (4T80-E) or TRANSAXLE (4T65-E) .
  4. If equipped with a 4.0L install the air cleaner intake duct. Refer to Air Cleaner Intake Duct Replacement .
    Fig 1: Routing Wheel Speed Sensor Jumper Through Engine Compartment To Wheel Well
    G01582503Courtesy of GENERAL MOTORS CORP.
  5. Raise the vehicle.
  6. Connect the wheel speed sensor connector (7) to the wheel speed sensor (6).
  7. Connect the harness grommet (3) to the strut bracket (5).
  8. Connect the harness grommet (1) to the rail bracket (2).
  9. Connect the harness clip (4) the rail bracket (2).
  10. Install the left front tire and wheel assembly. Refer to TIRE AND WHEEL REMOVAL AND INSTALLATION in Tires and Wheels.
  11. Lower the vehicle.
  12. Perform the ABS Diagnostic System Check. Refer to DIAGNOSTIC SYSTEM CHECK - ABS 
    Fig 2: Connecting Speed Sensor Jumper Harness Components
    G01582504Courtesy of GENERAL MOTORS CORP.
RENDER: 1.0x

NO RELATED

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.