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Home >> Mitsubishi >> 1995 >> Eclipse RS, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Tests W/Codes - 2.0L Turbo >> Diagnostic Tests >> Code P0100: Volume Airflow Circuit Fault

Code P0100: Volume Airflow Circuit Fault

NOTE: For component terminal identification, see TERMINAL IDENTIFICATION  in this article. For appropriate WIRING DIAGRAMS, see WIRING DIAGRAMS  section.
  1. Install test harness (MB991348) between volume airflow sensor harness connector and sensor. Start engine. Measure voltage between airflow sensor connector terminal No. 3 (Blue/Yellow wire) and ground. If voltage is 2.2-3.2 volts, go to next step. If voltage is not 2.2-3.2 volts, go to step  3 .
  2. Measure voltage between volume airflow sensor connector terminal No. 7 (Red/White wire) and ground. Voltage should be 0-1 volt at idle and 6-9 volts at 2000 RPM. If voltage is within specification, replace PCM. If voltage is not within specification, go to step  6 .
  3. Disconnect volume airflow sensor connector. Turn ignition on. Measure voltage between sensor connector terminal No. 4 (Red wire) and ground. If battery voltage exists, go to next step. If battery voltage does not exist, check wiring harness between airflow sensor and MFI relay connector.
  4. Measure voltage between sensor connector terminal No. 3 (Blue/Yellow wire) and ground. Voltage should be 4.8-5.2 volts. Check continuity between sensor connector terminal No. 5 (Black wire) and ground. If voltage is within specification and continuity exists, check airflow sensor connector. If airflow sensor connector is okay, replace volume airflow sensor.
  5. If voltage is not within specification or continuity does not exist, check airflow sensor connector and wiring harness between PCM and airflow sensor connector. If connector and wiring is okay, replace PCM.
  6. Turn ignition on. With PCM connector connected, measure voltage between PCM terminal No. 19 (Red/White wire) and ground. If voltage is 6-9 volts, check PCM connector. If PCM connector is okay, replace PCM. If voltage is not 6-9 volts, check airflow sensor connector. If airflow sensor connector is okay, replace, volume airflow sensor.
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