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Home >> Chevrolet >> 1996 >> C3500 HD 6.5 F, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Tests W/Codes - Gasoline >> Diagnostic Trouble Code Tests >> DTC P0103 - MAF Sensor Circuit High Frequency >> Diagnostic Procedures

Diagnostic Procedures

  1. Perform On-Board Diagnostic (OBD) System Check. After performing OBD system check, go to next step.
  2. Install scan tool. Start engine. With engine idling, monitor MAF display on scan tool. If MAF display is greater than 20 gm/s, go to step 4). If MAF is not greater than 20 gm/s, go to next step.
  3. Turn ignition on, with engine off. Using scan tool, review and record FAILURE RECORDS data. Operate vehicle within FAILURE RECORDS conditions. Using scan tool, monitor SPECIFIC DTC for DTC P0103. If scan tool indicates DTC P0103 FAILED THIS IGN?, go to next step. If scan tool does not indicate DTC P0103 FAILED THIS IGN?, see DIAGNOSTIC AIDS.
  4. Turn ignition off. Disconnect MAF sensor connector. Start engine. With engine idling, monitor MAF display on scan tool. If scan tool display is zero gm/s, go to next step. If scan tool display is not zero gm/s, go to step 7).
  5. Check for poor connection at MAF sensor and repair as necessary. If poor connection is present, go to step 10). If poor connection is not present, go to next step.
  6. Replace MAF sensor. Go to step 10).
  7. Check MAF sensor harness for incorrect routing near secondary ignition wires or coils, or near other high voltage components such as solenoids, relays or motors. Repair as necessary. If a problem was found, go to step 10). If a problem was not found, go to next step.
  8. Check for poor connection at MAF signal circuit terminal of VCM and repair as necessary. If poor connection is present, go to step 10). If poor connection is not present, go to next step.
  9. Replace VCM. Program replacement VCM using required equipment. Go to next step.
  10. Using scan tool, select DTC, CLEAR INFO. Start and warm engine to normal operating temperature. Select DTC, SPECIFIC, then enter DTC P0103. Operate vehicle within the conditions for setting this DTC. If scan tool indicates that this test ran and passed, go to next step. If scan tool does not indicate that this test ran and passed, repeat step 2).
  11. Using scan tool, select CAPTURE INFO, REVIEW INFO. If any undiagnosed DTC(s) are displayed, go to applicable DTC test.
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