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Home >> Mitsubishi >> 2002 >> Eclipse GS, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Self Diagnostics - 2.4L >> Diagnostic Tests >> DTC P0102: Volume Air Flow (VAF) Circuit Low Input >> Diagnostic Procedure
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Diagnostic Procedure

CAUTION: To prevent damage to Scan Tool (MB991502), always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting the scan tool.
  1. Connect Scan Tool (MB991502) to the data link connector and start the engine. Set the scan tool to the data reading mode for item 12, Volume Air Flow Sensor. Warm up the engine to normal operating temperature: 176-205°F (80-96°C). The standard value during idling should be 10 Hz or more. When the engine is revved, the frequency should increase according to the increase in engine speed. Turn the ignition off. If the sensor is operating properly, it can be assumed that this malfunction is intermittent, refer to INTERMITTENT DIAGNOSTIC TROUBLE CODES . If the sensor is malfunctioning, go to next step.
  2. Do not disconnect the connector B-14. Turn the ignition on. Measure the voltage between terminal 4 and ground of volume air flow sensor connector B-14 by backprobing. See Figure. The voltage should be battery positive voltage. Turn the ignition off. If the voltage is normal, go to step  5, otherwise go to next step.
  3. Disconnect the connector B-14 and measure at the harness side. Turn the ignition on. Measure the voltage between terminal 4 and ground of the volume air flow sensor harness side connector B-14. Voltage should be battery positive voltage. Turn the ignition off. If the voltage is normal, go to next step. If the voltage is abnormal, repair harness wire between MFI relay connector A-18X, terminal 4 and volume air flow sensor connector B-105, terminal 4 (because of open circuit or short circuit to ground) and go to step  13. See Figure and Figure .
  4. Check connector B-14 at the volume air flow sensor for damage. If the connector is in good condition, repair harness wire between MFI relay connector A-18X, terminal 4 and volume air flow sensor connector B-14, terminal 4 (because of harness damage) and go to step  13. See Figure and Figure . If the connector is damaged, repair or replace it and go to step  13.
  5. Check connector B-14 at volume air flow sensor for damage. If the connector is in good condition, go to next step. If the connector is damaged, repair or replace it and go to step  13.
  6. Disconnect the connector B-14 and measure at the harness side. Turn the ignition on. Measure the voltage between terminal 3 and ground of the volume air flow sensor harness side connector B-14. Voltage should be between 4.8-5.2 volts. Turn the ignition off. If the voltage is normal, go to step  9, otherwise go to next step.
  7. Check connector C-60 at ECM (M/T) or connector C-54 at PCM (A/T) for damage. See Figure or Figure . If the harness connector is in good condition, go to next step. If the harness connector is damaged, repair or replace it and go to step  13.
  8. Check for short circuit to ground between volume air flow sensor connector B-14 terminal 3 and ECM connector C-60 terminal 90 (M/T) or PCM connector C-54 terminal 65 (A/T). See Figure, Figure or Figure . If the harness wire is in good condition, replace the ECM or PCM and go to step  13. If the harness wire is damaged, repair it and go to step  13.
  9. Disconnect the connector B-14 and measure at the harness side. Check for the continuity between terminal 5 and ground of volume air flow sensor harness side connector B-14. The resistance should be less than 2 ohm. If the continuity is normal, go to step  12, otherwise go to next step.
  10. Check connector C-53 at ECM (M/T) or connector C-50 at PCM (A/T) for damage. See Figure or Figure . If the connector is in good condition, go to next step. If the connector is damaged, repair or replace it and go to step  13.
  11. Check for open circuit and harness damage between volume air flow sensor connector B-14 terminal 5 and ECM connector C-53 terminal 40 (M/T) or PCM connector C-50 terminal 16 (A/T). See Figure, Figure or Figure . If the harness wire is in good condition, replace the ECM or PCM and go to step  13. If the harness wire is damaged, repair it and go to step  13.
  12. Check connector C-53 at ECM (M/T) or connector C-50 at PCM (A/T) for damage. If the connector is in good condition, replace the volume air flow sensor and go to next step. If the connector is damaged, repair or replace it and go to next step.
  13. Carry out a test drive with the drive cycle pattern, refer to OTHER MONITOR . Check for diagnostic trouble code P0102. If the code is showing, retry the troubleshooting. If the code is absent, the inspection is complete.
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