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Home >> Cadillac >> 2007 >> XLR V >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls And Fuel - 4.4L - DTC P0171 To DTC 00700 >> DTC P0351-P0358 >> Circuit/System Testing
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Circuit/System Testing

  1. Turn OFF the ignition.
  2. Disconnect the ECM.
    3. IMPORTANT: A high resistance on any IC circuit can cause a misfire before the DTC sets.
  3. Test the affected IC circuit for the following.
    • Short to voltage
    • Short to ground
    • Open/high resistance
    • If a fault is found, repair the circuit as needed.
  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 the ignition/coil.
    • If the DTC or the misfire does not transfer with the suspect ignition/coil module, replace the ECM.
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