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Esteem 1.8L

  1. Remove ECM/PCM but leave electrical connectors connected. Disconnect Mass Airflow (MAF) sensor connector. Turn ignition off . Connect voltmeter between ground and MAF sensor connector Red/Black wire terminal. Turn ignition on. If battery voltage is present, go to next step. If battery voltage is not present, check wiring for an open circuit or poor connection.
  2. Turn ignition off. Reconnect MAF sensor connector. Turn ignition on. Measure voltage between ground and ECM/PCM connector C20 terminal No. 24 (Green wire). See PIN VOLTAGE/CIRCUIT RESISTANCE CHARTS article for ECM/PCM connector and terminal identification. Voltage should be .5-1.0 volt. Start engine and ensure voltage is lower than 5 volts and increases as RPM increases. If voltages are to specification, system is okay. If voltages are not to specification, go to DTC P0101: MASS AIRFLOW (MAF) CIRCUIT PERFORMANCE PROBLEM under DIAGNOSTIC TESTS in appropriate SELF-DIAGNOSTICS article.
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