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Home >> Pontiac >> 2001 >> Aztek Base, AWD >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls Self-Diagnostics >> Diagnostic Tests >> DTC P0103: Mass Airflow Sensor Circuit - High Frequency >> Diagnostic Procedures
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Diagnostic Procedures

  1. Perform powertrain diagnostic system check. See POWERTRAIN DIAGNOSTIC SYSTEM CHECK  under SELF-DIAGNOSTIC SYSTEM. After performing diagnostic system check, go to next step.
  2. Observe FREEZE FRAME/FAILURE RECORDS data for this DTC. Turn ignition off for 30 seconds. Operate vehicle within conditions for running this DTC or as close to FREEZE FRAME/FAILURE RECORDS data observed. See CODE ENABLE CRITERIA . If DTC fails this ignition, go to next step. If DTC does not fail this ignition, see DIAGNOSTIC AIDS .
  3. Turn ignition off. Disconnect MAF sensor harness connector. Start engine. Using scan tool, observe frequency parameter of MAF sensor. If scan tool displays zero Hz, go to step  5. If scan tool does not display zero Hz, go to next step.
  4. Turn ignition off. Check MAF sensor harness for incorrect routing at secondary ignition wires or coils, solenoids, relays or motors. Repair as necessary. After repairs, go to step  9. If no problem is found, go to next step.
  5. Turn ignition off. Check for poor connections at MAF sensor harness connector. Repair as necessary. After repairs, go to step  9. If connections are okay, go to step  7.
  6. Check PCM harness connector for poor connections. Repair as necessary. After repairs, go to step  9. If connections are okay, go to step  8.
  7. Replace MAF sensor. After replacing sensor, go to step  9.
  8. Replace PCM. Perform PCM relearn procedure. See POWERTRAIN CONTROL MODULE  under PROGRAMMING. After repairs, go to next step.
  9. Turn ignition on, with engine off. Using scan tool, clear DTCs. Turn ignition off for 30 seconds. Operate vehicle within conditions for running this DTC. See CODE ENABLE CRITERIA . If DTC runs and passes, go to next step. If DTC resets, go to step  2.
  10. Using scan tool, observe stored information and CAPTURE INFO. If scan tool displays any undiagnosed DTCs, diagnose affected DTCs. See DIAGNOSTIC TROUBLE CODE DEFINITIONS . If no DTCs are displayed, system is okay.
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