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Hard Or Intermittent Trouble Code Determination

NOTE: DTCs will be recorded at various operating times. Some codes require operation of related sensor or switch for 5 seconds; others require operation for 5 minutes or longer at normal operating temperature, vehicle speed and load. Therefore, some DTCs may not set in a service bay operational mode and may require road testing vehicle in order to duplicate conditions under which code will set.

During any diagnostic procedure, determine if DTC(s) are hard failure codes or intermittent failure codes. Diagnostic procedures will not always help analyze intermittent codes. To determine hard codes and intermittent codes:

  1. Enter diagnostic mode. Read and record all stored DTCs. Exit diagnostic mode, and clear DTCs. See CLEARING DIAGNOSTIC TROUBLE CODES .
  2. Apply parking brakes. Place transmission in Neutral or Park. Block drive wheels. Start engine. MIL should turn off. Operate warm engine at specified RPM for 2 minutes and note MIL.
  3. If MIL illuminates, enter diagnostic mode. Read and record DTCs. This will reveal hard failure codes. Oxygen sensor related codes may require a road test to reset hard failure after DTCs were cleared.
  4. If MIL does not illuminate, all stored DTCs were intermittent failures, except as noted above.

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