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DTC P0102: Mass Airflow (MAF) Sensor Circuit Low Input (Esteem 1.8L)

  1. Ensure ignition is off. Connect scan tool to Data Link Connector (DLC). Start engine and check MAF sensor value displayed on scan tool. At idle, MAF sensor value should be 1.5-4.0 g/sec. At 2500 RPM, MAF sensor value should be 5.0-10.0 g/sec. If MAF sensor values are to specification, problem is intermittent. If MAF sensor values are not to specification, go to next step.
  2. Ensure ignition is off. Disconnect MAF sensor connector. Turn ignition on. Measure voltage between MAF sensor connector terminal No. 3 (Red/Black wire) and ground. If voltage is 10-14 volts, go to next step. If voltage is not 10-14 volts, repair open or short circuit in Red/Black wire.
  3. Ensure ignition is off. Connect MAF sensor connector. Remove PCM. Turn ignition on. Measure voltage between PCM connector C20 terminals No. 24 (Green wire) and No. 27 (Orange wire). If about .5-1.0 volt is present, check for poor connection at Green wire. If connection is okay, replace PCM. If about .5-1.0 volt is not present, check MAF sensor connector and wiring. If MAF sensor connector and wiring are okay, replace MAF sensor.
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