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Check For Intermittent Problems

  1. CHECK FOR INTERMITTENT PROBLEMS 

    HINT:

    Intelligent tester only:

    Inspect the vehicle's ECM using check mode.

    Intermittent problems are easier to detect with an intelligent tester when the ECM is in check mode. In check mode, the ECM uses 1 trip detection logic, which is more sensitive to malfunctions than normal mode (default), which uses 2 trip detection logic.

    1. Clear DTCs (See DTC CHECK / CLEAR ).
    2. Switch the ECM from normal mode to check mode using an intelligent tester (See CHECK MODE PROCEDURE ).
    3. Perform a simulation test (See HOW TO PROCEED WITH TROUBLESHOOTING ).
    4. Check and wiggle the harness(es), connector(s) and terminal(s) (See HOW TO TROUBLESHOOT ECU CONTROLLED SYSTEMS ).
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