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Home >> GMC >> 2003 >> Safari Van Cargo, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 54 (Engine Control System - Self-Diagnostics - 4.2L) >> Diagnostic Tests >> DTC P0301-P0306: Engine Misfire Detected In Cylinder No. 1-6 >> Test Description

Test Description

WARNING: This page is about a different car, the 2002 Oldsmobile Bravada, 2002 GMC Envoy XL, 2002 GMC Envoy, and 2002 Chevrolet TrailBlazer. However, it is still accessible from the selected car via links, so may be relevant.

The numbers below refer to the step numbers on the diagnostic procedures.

  1. 2

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

  2. 7

    This test is to determine if there is a problem in the Heated Oxygen Sensor (HO2S) or wiring that is causing the PCM to alter the fuel trim. When the sensors are disconnected, the fuel system should go into Open Loop. If the misfire counters stop incrementing, perform the HO2S diagnosis for sensor 1.

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