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Diagnostic Aids

  1. Low system airflow can cause an intermittent complaint. Inspect for the following conditions:
    • Any restriction in the exhaust system that may produce back pressure.
    • Pinched, kinked, restricted, or leaking pipes, hoses, or fittings.
    • A restricted pump inlet hose, duct, or filter.
    • Pinched, kinked, restricted, or leaking vacuum lines.
    • Heat damage.
  2. A short to voltage in the pump relay control circuit can result in the AIR pump running continuously with the ignition OFF by back-feeding to ground. This will eventually result in pump failure.
  3. An AIR pump that had become inoperative and had shown indications of having exhaust gases in the outlet port would indicate check valve failure.
    4. NOTE: Do not operate the AIR pump for more than 60 seconds. Continuous operation of the AIR pump in excess of 60 seconds will damage the AIR pump.
  4. If the DTC cannot be duplicated and is determined to be intermittent, reviewing the Failure Records data can be useful in determining when the DTC was last set. Also see INTERMITTENT CONDITIONS  under SELF-DIAGNOSTIC SYSTEM.
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