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Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 937 (Engine Controls And Fuel - 4.3L - DTC P0340 To DTC P2138) >> DTC P0351, P0352, or P0353 >> Circuit/System Testing

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.
  1. Turn OFF the ignition.
  2. Disconnect the ECM C2 harness connector.
  3. Disconnect the ignition control module harness connector.
    4. IMPORTANT: A high resistance on an ignition coil control circuit can cause a misfire condition, before DTC P0351-P0353 sets.
  4. Test the affected ignition coil control circuit for the fault condition identified in Circuit/System Verification.
    • If a condition is detected, repair the circuit as required.
  5. Connect the ECM C2 harness connector.
  6. Connect jumper wires from the harness connector of the ICM to the corresponding terminals of the ICM.
  7. Using the jumper wires, exchange the affected ignition coil control circuit with a known good ignition coil control circuit. Also exchange the spark plug wires of the corresponding coils.
  8. Start and run the engine. With a scan tool, monitor the ignition coil control circuit parameters.
    • If the circuit status fault identified in Circuit/System Verification transfers with the suspect ignition coil control circuit, replace the ECM.
    • If the circuit status fault identified in Circuit/System Verification does not transfer with the ignition coil/module, replace the ICM.
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