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Esteem 1.8L

NOTE: To avoid damaging MAF sensor, DO NOT remove sensor from throttle body. When MAF sensor requires replacement, replace throttle body.
  1. Turn ignition off. Disconnect Mass Airflow (MAF) sensor 3-pin harness connector. Turn ignition on. Measure voltage between ground and MAF sensor harness connector terminal No. 3 (Red/Black wire). If battery voltage is present, go to next step. If battery voltage is not present, check wiring for an open circuit or poor connection. See WIRING DIAGRAMS article.
  2. Turn ignition off. Reconnect MAF sensor harness connector. Access ECM. See Figure . Turn ignition on. Backprobing at ECM, measure voltage between ground and ECM connector C20 terminal No. 24 (Green wire). See Figure . 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 AIR FLOW SENSOR - PERFORMANCE PROBLEM under DIAGNOSTIC TESTS in SELF-DIAGNOSTICS - ESTEEM 1.8L article.
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