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Home >> Dodge and Ram >> 1996 >> Stealth Base, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Tests W/Codes >> Circuit Tests >> DTC P0100 - Volume Airflow (VAF) Sensor Circuit Failure

DTC P0100 - Volume Airflow (VAF) Sensor Circuit Failure

NOTE: For component terminal identification, see TERMINAL IDENTIFICATION  in this article. For wiring diagrams, see WIRING DIAGRAMS article.
NOTE: Procedures are provided by manufacturer for component testing using an engine analyzer with oscilloscope capability. Refer to manufacturer's operation manual for instructions in use of oscilloscope.
  1. If using scan tool, go to step 3). Disconnect VAF sensor connector. Install Test Harness (MB991348 ) between VAF sensor and connector. Using engine analyzer with oscilloscope capability, connect special patterns probe to VAF sensor connector terminal No. 3 or to PCM connector terminal No. 70 (No. 90 on Stealth and 3000GT).
  2. Start engine. Verify waveform high frequency and low frequency patterns are of about the same length (time). Verify wavelength decreases and frequency increases as engine RPM increases. If conditions are not as specified, replace VAF sensor. If conditions are as specified, go to step 4).
  3. Warm vehicle to normal operating temperature. Ensure headlights and accessories are off. Using scan tool, read VAF sensor value (frequency). See VOLUME AIRFLOW SENSOR VALUES  table. Frequency should increase when engine is raced. If values are not as specified, replace VAF sensor. If values are as specified, disconnect VAF sensor connector and go to next step.
    VOLUME AIRFLOW SENSOR VALUES

    Application Hz @ 700 RPM Hz @ 2000 RPM
    Diamante
    DOHC 24-50 71-111
    SOHC 24-50 68-108
    Stealth & 3000GT
    DOHC
    Non-Turbo 22-48 50-90
    Turbo 22-48 68-108
    SOHC 21-47 57-97
  4. On Stealth and 3000GT, go to next step. Disconnect MFI relay connector. Using DVOM, check for continuity between VAF sensor connector terminal No. 4 and MFI relay connector terminal No. 3 (No. 4 on Diamante). If continuity does not exist, repair wiring harness as necessary. If continuity exists, go to next step.
  5. Using DVOM, check for continuity between chassis ground and VAF sensor connector terminal No. 5. If continuity does not exist, repair wiring harness as necessary. If continuity exists, go to next step.
  6. Turn ignition switch to OFF position. Disconnect PCM connector. Ground PCM connector terminal No. 19. Using DVOM, check for continuity between chassis ground and VAF sensor connector terminal No. 7. If continuity does not exist, repair wiring harness as necessary. If continuity exists, go to next step.
  7. On Stealth and 3000GT, go to next step. Ground PCM connector terminal No. 70 (No. 90 on Diamante). Using DVOM, check for continuity between chassis ground and VAF sensor connector terminal No. 3. If continuity does not exist, repair wiring harness as necessary. If continuity exists, turn ignition switch to ON position and go to step 9).
  8. Turn ignition switch to ON position. Using DVOM, check voltage between chassis ground and VAF sensor connector terminal No. 4. If battery voltage does not exist, repair wiring harness as necessary. If battery voltage exists, go to next step.
  9. Using DVOM, check voltage between chassis ground and VAF sensor connector terminal No. 3. If voltage is not 4.8-5.2 volts, replace PCM. If voltage is as specified, condition required to set DTC is not present at this time. Go to next step.
  10. Test is complete. Intermittent problem may exist. Road test vehicle (if necessary) and attempt to duplicate conditions that caused original complaint. Recheck for DTCs. If no DTCs are displayed, go to INTERMITTENT DTCS  .
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