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Circuit/System Testing

WARNING: This page is about a different car, the 2007 GMC Sierra and 2007 Chevrolet Silverado. However, it is still accessible from the selected car via links, so may be relevant.
IMPORTANT: You must perform the Circuit/System Verification  before proceeding with Circuit/System Testing.
  1. Ignition ON, observe the Run/Crank Ignition 1 Voltage signal and the EC Ignition Relay Feedback scan tool parameter to determine which is less than B+.
  2. Ignition OFF, remove the relay that corresponds to the scan tool parameter that is less than B+.
    3. IMPORTANT: A resistance of 5 ohms or greater in the circuit/underhood fuse block will cause the DTC to set.
  3. Ignition ON, connect a 3A fused jumper wire between B+ and the applicable ignition 1 circuit terminal. Verify that the applicable scan tool parameter displays B+.
    • If the applicable scan tool parameter is less than the specified value, test the ignition 1 circuit for an open/high resistance. If the circuit tests normal, replace the ECM.
  4. If all circuits test normal, replace the applicable relay.
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