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HOMESERVICE MANUALSCHEVROLET2003TRAILBLAZER 4.2 S, 4WDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 629 (ANTI-LOCK BRAKE SYSTEM)DIAGNOSTIC INFORMATION & PROCEDURESDIAGNOSTIC SYSTEM CHECK - ABSTEST DESCRIPTION
2003 Chevrolet TrailBlazer 4.2 S, 4WD

Test Description

2003 Chevrolet TrailBlazer 4.2 S, 4WDSECTION Test Description
WARNING: This page does not describe the selected car, but rather 7 other vehicles, including the 2002 GMC Yukon XL, 2002 GMC Yukon, 2002 Chevrolet Tahoe, 2002 Chevrolet Suburban, and 2002 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.

The numbers below refer to the step numbers in the diagnostic table.

  1. 2.  Lack of communication may be due to partial or total malfunction of the class 2 serial data circuit. The specified procedure will determine the particular condition.
  2. 4.  The presence of DTCs that begin with a "U" indicates that some other module is not communicating. The specified procedure will compile all of the available information before tests are performed. The Electronic Brake Control Module (EBCM) software does not support DTCs which begin with a "U". The EBCM may set DTC C0290, C0292 or C0297 to indicate a communication failure between the EBCM and the Powertrain Control Module (PCM).
  3. 5.  These DTCs may be set by the PCM and may effect the rear wheel speed input to the EBCM or indicate an internal failure within the PCM.
  4. 6.  This DTC may be set by the Instrument Panel Cluster (IPC) and effects the IPC's ability to illuminate indicators.
  5. 7.  These DTCs may be set by the suspension control module (RTD) and may effect VSES system operation. These DTCs do not effect ABS systems on vehicles which are not equipped with JL4.
  6. 8.  These DTCs may be set by the suspension control module (RTD) and may effect VSES system operation. These DTCs do not effect ABS systems on vehicles which are not equipped with JL4.
Fig 1: Diagnostic System Check - ABS (1 Of 2)
G01663980Courtesy of GENERAL MOTORS CORP.
RENDER: 1.0x

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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.