Ignition System Wiring Diagram (2002-2005 4.2L Chevrolet TrailBlazer)

  • By: Abraham Torres-Arredondo
  • Created: 06 February 2019
  • Updated: 19 February 2024
  • Articl Id: 810
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The following simplified ignition system wiring diagrams include the coil-on-plug (COP) ignition coils, camshaft position sensor, crankshaft position sensor, and the knock sensor circuits.

Applies to the 2002, 2003, 2004, 2005 4.2L Chevrolet Envoy and GMC Envoy.

Contents of this tutorial:

DIAGRAM 1: Ignition System (Part 1 of 3)

PART 1 Of 3: Typical Ignition System Wiring Diagram -2002, 2003, 2004, 2005 4.2L Chevrolet TrailBlazer And GMC Envoy

NOTE: The following tutorial will help you test the ignition coils: How To Test The Ignition Coils (2002-2005 4.2L Chevrolet TrailBlazer).

DIAGRAM 2: Ignition System (Part 2 of 3)

PART 2 Of 3: Typical Ignition System Wiring Diagram -2002, 2003, 2004, 2005 4.2L Chevrolet TrailBlazer And GMC Envoy

  2. Applies To:

Chevrolet Vehicles:

  • Trailblazer 4.2L
    • 2002, 2003, 2004, 2005

GMC Vehicles:

  • Envoy 4.2L
    • 2002, 2003, 2004, 2005