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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 83 (Engine Controls Self-Diagnostics - 2.2L) >> Diagnostic Tests >> DTC P0301-P0304: Cylinder Misfire Detected >> Test Description

Test Description

WARNING: This page is about a different car, the 2002 GMC Sonoma and 2002 Chevrolet S10 Pickup. 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

    Whenever a DTC P0108 is present, verify that no misfire is present by viewing the misfire counters. DTC P0108 may set as a result of a misfire.

  2. 3

    A visual and physical inspection should include inspecting for the following conditions:
    • The wiring for proper connections, pinches and cuts.
    • Clean and tight PCM grounds.
    • The vacuum hoses for splits, kinks and proper connections as shown on the vehicle emission information label. Inspect thoroughly for any type of leak or restriction.

  3. 4

    This step determines if the Misfire DTC is the result of a hard malfunction or an intermittent condition.

  4. 6

    If the misfire is not present, operate the vehicle under the conditions found in the Freeze Frame data in order to detect the misfire. Depending on the engine load, the conditions may have to be maintained for up to 20 seconds. If the misfire accumulators start to increment, the misfire is present. A history misfire counter will record the number of misfires that occur until the DTC is cleared. The current counter must count a total of at least 195 misfires before the history counter begins storing the misfire information.

  5. 10

    No spark on one coil may be caused by an open secondary circuit. Therefore, the coils secondary resistance should be inspected.

  6. 13

    Use the injector test light to test the harness wiring and for PCM control of the injectors.

  7. 14

    Perform the Fuel Inj Coil Test on the misfiring cylinder only.

  8. 16

    Determines if the injector driver circuit is shorted to ground, voltage or if the PCM is malfunctioning.

  9. 22

    Replace any spark plugs that are worn, cracked, or fouled.

  10. 27

    Since the voltage is supplied to the injector on a single circuit before the injector harness, the malfunction may only be a poor connection or an open in the injector harness. An open before the harness may result in a Cranks But Does Not Run complaint.

  11. 28

    A basic engine problem that affects only a single cylinder, such as a valve train or compression concern, is possible at this point.
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