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HOMESERVICE MANUALSCHEVROLET2001CHEVY EXPRESS G2500, VAN CARGO EXTENDED, 5.7 R, L31/KL8REPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 72 (ENGINE CONTROL SYSTEM TESTING & ENGINE COMPONENT TESTING)IGNITION SYSTEMSELECTRONIC IGNITION (EI) SYSTEM DIAGNOSISCIRCUIT DESCRIPTION
2001 Chevrolet Chevy Express G2500, Van Cargo Extended, 5.7 R, L31/KL8

Circuit Description

2001 Chevrolet Chevy Express G2500, Van Cargo Extended, 5.7 R, L31/KL8SECTION Circuit Description
WARNING: This page does not describe the selected car, but rather 31 other vehicles, including the 2002 Saturn SL2, 2002 Saturn SL1, 2002 Saturn SL, 2002 Saturn SC2, and 2002 Saturn SC1. However, it is still accessible from the selected car via links, so may be relevant.

There are 2 separate ignition module assemblies, one for each bank of cylinders. Each assembly contains an ignition control (IC) module and 4 ignition coils. Each IC module consists of the following circuits:

  • The ignition 1 voltage
  • A ground
  • The IC timing low reference
  • The IC control circuits for cylinders 1-8

Each ignition coil connects directly to its spark plug via a short boot. The IC control circuits transmit timing pulses from the powertrain control (PCM) module to the IC modules, which trigger the coils to fire the plugs in the correct sequence. The PCM monitors each IC control circuit for improper voltage levels.

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