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Home >> Cadillac >> 2003 >> CTS Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Self-Diagnostics >> Diagnostic Tests >> DTC P0301: Cylinder No. 1 Misfire Detected, DTC P0302: Cylinder No. 2 Misfire Detected, DTC P0303: Cylinder No. 3 Misfire Detected, DTC P0304: Cylinder No. 4 Misfire Detected, DTC P0305: Cylinder No. 5 Misfire Detected & DTC P0306: Cylinder No. 6 Misfire Detected >> Test Description

Test Description

The numbers below refer to the number in the diagnostic procedure.

  1. 2

    DTCs that may cause a misfire DTC to set may include those for injector control circuits, oxygen sensors, the EVAP system, or fuel trim.

  2. 9

    This test is to determine if there is a problem in the Heated Oxygen Sensor (HO2S) or wiring that is causing the ECM to alter the fuel trim. When the sensors are disconnected, the fuel system should go into Open Loop.

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