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Home >> Oldsmobile >> 1998 >> Regency >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control Systems Tests W/Codes >> Diagnostic Trouble Codes >> DTC P0103 - MAF Sensor Circuit High Frequency >> Diagnostic Procedures
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Diagnostic Procedures

  1. Perform POWERTRAIN ON-BOARD DIAGNOSTIC (OBD) SYSTEM CHECK . Read and record FREEZE FRAME and/or FAIL RECORDS data for each DTC set. After performing OBD system check, go to next step.
  2. Start engine. With engine at idle, use scan tool to read MAF FREQUENCY. If frequency is greater than 10,500 Hz on VIN K, or greater than 11,500 Hz on VIN 1, go to step 4). If frequency is less than specified, go to next step.
  3. Turn engine off. Turn ignition on, engine off. Using scan tool, read and record FAIL RECORDS data. Operate vehicle within conditions noted in FAIL RECORDS data. Using scan tool, read SPECIFIC DTC. If scan tool displays DTC P0103 FAILED THIS IGN, go to next step. If scan tool does not display DTC P0103 FAILED THIS IGN, go to DIAGNOSTIC AIDS.
  4. Turn ignition off. Disconnect MAF sensor harness connector. Turn engine on and allow it to idle. Using scan tool, read MAF FREQUENCY. If frequency is zero Hz, go to next step. If frequency is not as specified, go to step 7).
  5. Check for faulty connection at MAF sensor. Repair connection as necessary. After repairs, go to step 10). If connection is okay, go to next step.
  6. Replace MAF sensor. After replacing sensor, go to step 10).
  7. Ensure MAF sensor harness is not routed too close to high-voltage wires, such as spark plug cables, ignition coils or other high voltage components. Reroute harness if necessary. After repairs, go to step 10). If harness routing is okay, go to next step.
  8. Check MAF sensor signal circuit connection at PCM. Repair connection as necessary. After repairs, go to step 10). If connection is okay, go to next step.
  9. Replace PCM. Program replacement PCM using required equipment. After replacing PCM, go to next step.
  10. Turn ignition on, engine off. Using scan tool, read and record FAIL RECORDS DATA, and clear DTCs. Operate vehicle within conditions noted in FAIL RECORDS data. Using scan tool, select SPECIFIC DTC INFO for DTC P0103. If scan tool displays DTC P0103 FAILED THIS IGN, return to step 2). If scan tool does not display DTC P0103 FAILED THIS IGN, repair is complete.
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