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Home >> Chevrolet >> 2006 >> Cobalt LTZ >> Repair and Diagnosis >> External Pages >> Different car >> Section 793 (Engine Controls And Fuel - 2.0L - DTC P0243 To DTC P0700) >> DTC P0351-P0354 >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2008 Chevrolet Cobalt. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, disconnect the harness connector at the affected ignition coil/module.
  2. Ignition OFF for 90 seconds, disconnect the ECM connector X1.
  3. Test for less than 5.0 ohms between the ignition coil/module IC circuit terminal 3 and the appropriate ECM terminal listed below:
    • IC 1 circuit: terminal 55
    • IC 2 circuit: terminal 80
    • IC 3 circuit: terminal 79
    • IC 4 circuit: terminal 56
    • If greater than the specified range, test the IC circuit for an open/high resistance.
  4. Connect the ECM.
  5. Exchange the affected ignition coil/module with the ignition/coil module of a good cylinder.
  6. Start the engine and observe the scan tool.
    • If the DTC or the misfire transfers with the suspect ignition/coil module, replace as needed.
    • If the DTC or the misfire does not transfer with the suspect ignition/coil module, replace the ECM.
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