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Home >> Saturn >> 1999 >> SW1 Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - Tests W/Codes - DTC P0100-P0134 >> DTC P0103 >> DTC P0103: MAF Sensor Circuit-High-Frequency (4.3L, 5.0L, 5.7L & 7.4L "C", "G", "K", "L", "M", "P","S" & "T" Series) >> Diagnostic Procedures

Diagnostic Procedures

  1. Perform On-Board Diagnostic (OBD) system check. See ON-BOARD DIAGNOSTIC (OBD) SYSTEM CHECK under SELF-DIAGNOSTIC SYSTEM in SELF-DIAGNOSTICS INTRODUCTION article. After performing OBD system check, go to next step.
  2. Install scan tool. Start engine. With engine at idle, 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 this DTC. If scan tool indicates that this DTC FAILED THIS IGN, go to next step. If scan tool does not indicate that this DTC FAILED THIS IGN, see DIAGNOSTIC AIDS .
  4. Turn ignition off. Disconnect MAF sensor connector. Start and operate engine at idle. Using scan tool, monitor MAF display. 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. Repair as necessary. After repairs, go to step  10. If connection is okay, go to next step.
  6. Replace MAF sensor. After repairs, go to step  10.
  7. Check MAF sensor harness for incorrect routing near secondary ignition wires or coils, or other high voltage components such as solenoids, relays or motors. Repair/reroute wiring as necessary. After repairs, go to step  10. If routing is okay, go to next step.
  8. Check for poor connection at MAF signal circuit terminal of VCM. Repair as necessary. After repairs, go to step  10. If connection is okay, go to next step.
  9. Replace VCM. Perform VCM, CKP and Passlock® system reprogramming procedures using required equipment. After repairs, go to next step.
  10. Using scan tool, clear DTCs. Start and warm engine to normal operating temperature. Select DTC, SPECIFIC, and then enter this DTC. 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, go to step  2.
  11. Using scan tool, select CAPTURE INFO, REVIEW INFO. If any undiagnosed DTCs are displayed, go to applicable DTC test. If no undiagnosed DTCs are displayed, system is okay.
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