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HOMESERVICE MANUALSCHEVROLET2003TRAILBLAZER 4.2 S, 4WDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 143 (ENGINE CONTROLS - SYSTEM & COMPONENT TESTING)IGNITION SYSTEMELECTRONIC IGNITION SYSTEM DIAGNOSIS (2.2L)DESCRIPTION
2003 Chevrolet TrailBlazer 4.2 S, 4WD

Electronic Ignition System Diagnosis (2.2L): Description

2003 Chevrolet TrailBlazer 4.2 S, 4WDSECTION Description
WARNING: This page does not describe the selected car, but rather 31 other vehicles, including the 2002 Saturn Vue, 2002 Pontiac Montana, 2002 Pontiac Aztek, 2002 Oldsmobile Silhouette, and 2002 Oldsmobile Bravada. However, it is still accessible from the selected car via links, so may be relevant.

The Ignition Control (IC) module has independent power and ground circuits. The circuits between IC module and Powertrain Control Module (PCM) consist of the following:

  • Low reference circuit.
  • Low resolution engine speed signal.
  • Two IC timing control signals for cylinders No. 1 and 4, and for cylinders No. 2 and 3.

IC module and PCM use low resolution engine speed signal to control ignition operation. Low resolution engine speed signal is derived from Crankshaft Position (CKP) sensor, which is connected directly to IC module.

RENDER: 1.0x

NO RELATED

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