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Diagnostic Test Procedure

  1. Disconnect negative battery cable. Disconnect the ECM connector EM82. Disconnect the MAF sensor connector. Measure resistance between ECM harness connector EM82 terminal No. 17 and MAF sensor harness connector terminal No. 4. Is resistance greater than 5 ohms? If yes, repair high resistance between ECM harness connector EM82 terminal No. 17 and MAF sensor harness connector terminal No. 4. If no, go to next step.
  2. Reconnect negative battery cable. Turn ignition on. Measure voltage between MAF sensor harness connector terminal No. 4 and ground. Is voltage greater than 3 volts? If yes, repair short to voltage. If no, go to next step.
  3. Turn ignition off. Measure resistance between MAF sensor harness connector terminal No. 4 and ground. Is resistance less than 10,000 ohms? If yes, repair short to ground. If no, install a new MAF sensor. See MASS AIRFLOW (MAF) SENSOR under ENGINE SENORS in REMOVAL, OVERHAUL & INSTALLATION article. If DTC resets, possible ECM failure.
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