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Diagnostic Aids

Test procedures are intended to identify faulty components or wiring while fault is present. If complaint is an intermittent condition, refer to TESTS W/O CODES article or CIRCUIT TEST Z in appropriate article:

  1. Check For Diagnostic Trouble Codes (DTC)

    Perform QUICK TEST. See appropriate article:

    If DTCs are present, service codes as necessary. If codes are not present, go to next step.

  2. Check Battery

    Turn ignition on. Check battery voltage. If battery voltage is less than 12 volts, service battery as necessary. If battery voltage is more than 12 volts, go to next step.

  3. Check For Spark

    Using Spark Tester (D81P-6666-A Or D89P-6666-A), check for spark at each spark plug wire or coil while cranking. If spark is consistent at all spark plug wires, go to next step. If spark is not consistent, go to CIRCUIT TEST JD in appropriate article to test crankshaft position sensor:

  4. Check Spark Plugs

    Remove and inspect spark plugs. Replace plugs as necessary. If spark plugs are okay, testing is complete. If fault is still present, go to TESTS W/O CODES article. If vehicle has a no-start condition, go to CIRCUIT TEST A in appropriate article:
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