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HOMESERVICE MANUALSCHEVROLET2003TRAILBLAZER 4.2 S, 4WDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 156 (ENGINE CONTROLS - REMOVAL, OVERHAUL & INSTALLATION - 6.6L DIESEL)COMPUTERIZED ENGINE CONTROLSENGINE CONTROL MODULEREMOVAL
2003 Chevrolet TrailBlazer 4.2 S, 4WD

Engine Control Module: Removal

2003 Chevrolet TrailBlazer 4.2 S, 4WDSECTION Removal
WARNING: This page is about a different car, the 2002 GMC Sierra, 2002 GMC Cab & Chassis Sierra, 2002 Chevrolet Silverado, and 2002 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: Do not touch the connector pins or soldered components on the circuit board in order to prevent possible Electrostatic Discharge (ESD) damage to the PCM.

Ensure ignition is off. Disconnect negative battery cable. See Figure. Release the ECM cover mounting holes away from the mounting tabs on the ECM mounting bracket. Release the ECM cover from the mounting bracket. Remove the ECM cover. Disconnect the ECM harness connectors. Release the spring latch from the ECM. Release the ECM mounting tabs from the ECM. Remove the ECM from the engine compartment.

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.