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DTC P0403: Exhaust Gas RECIRCULATION (EGR) Circuit Malfunction

  1. Turn ignition off and unplug EGR valve electrical connector. Using DVOM, measure resistance of EGR valve. See EXHAUST GAS RECIRCULATION (EGR) under EMISSION SYSTEMS & SUB-SYSTEMS in SYSTEM & COMPONENT TESTING article. If EGR valve resistance is as specified, go to next step. If EGR valve resistance is not as specified, replace EGR valve and retest system.
  2. Turn ignition off. Reconnect EGR valve electrical connector. Unplug PCM electrical connectors. See PIN VOLTAGE/CIRCUIT RESISTANCE CHARTS article for PCM connector and terminal identification. Using DVOM, measure resistance between PCM harness connector terminal C51-3-4 (Blue/Black wire) and the following PCM harness connector terminals:
    • C51-2-13 (Light Green/Red wire).
    • C51-2-14 (Light Green/Yellow wire).
    • C51-2-15 (Light Green/White wire).
    • C51-2-16 (Light Green wire).

    Resistance on each circuit should be between 20-24 ohms. If resistance values are as specified, problem is intermittent. See INTERMITTENTS in TROUBLE SHOOTING - NO CODES article. If resistance values are not as specified, repair open or short circuit in appropriate wire and retest system.

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