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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 379 (Engine Controls Self-Diagnostics - 3.4L) >> Diagnostic Tests >> DTC P0103: MAF Sensor Circuit - High Frequency >> Diagnostic Procedures

Diagnostic Procedures

WARNING: This page is about a different car, the 2003 Pontiac Grand Am, 2003 Oldsmobile Alero, 2003 Chevrolet Monte Carlo, and 2003 Chevrolet Impala. However, it is still accessible from the selected car via links, so may be relevant.
  1. Perform diagnostic system check - engine controls. See DIAGNOSTIC SYSTEM CHECK - ENGINE CONTROLS  under SELF-DIAGNOSTIC SYSTEM. After performing diagnostic system check - engine controls, go to next step.
  2. Observe the Freeze Frame/Failure Records data for this DTC. Turn ignition switch to OFF position for 30 seconds. Start the engine. Operate the vehicle within the Conditions For Running or as close to the Freeze Frame/Failure Records data that you observed. See CONDITIONS FOR RUNNING . Does the DTC fail this ignition? If yes, go to next step. If no, see DIAGNOSTIC AIDS .
  3. Turn ignition switch to OFF position. Disconnect the MAF sensor harness connector. Start the engine. Observe the MAF sensor parameter using a scan tool. Does the scan tool display zero Hz? If yes, go to next step. If no, go to step  5.
  4. Inspect the harness of the MAF sensor for incorrect routing that is too close to the secondary ignition wires or coils, any solenoids, relays or motors. Did you find and correct the condition? If yes, go to step  10. If no, go to step  7.
  5. Turn ignition switch to OFF position. Inspect the air induction system for any water intrusion. Did you find and correct the condition? If yes, go to step  10. If no, go to next step.
  6. Check for an intermittent and poor connections at the MAF sensor. Did you find and correct the condition? If yes, go to step  10. If no, go to step  8.
  7. Check for an intermittent and poor connections at the PCM. Did you find and correct the condition? If yes, go to step  10. If no, go to step  9.
  8. Replace MAF sensor. After replacing sensor, go to step  10.
  9. Replace PCM. Perform PCM relearn procedure. See POWERTRAIN CONTROL MODULE  under PROGRAMMING. After replacing PCM, go to next step.
  10. Use the scan tool to clear the DTCs. Turn ignition off for 30 seconds. Start the engine. Operate the vehicle within the Conditions For Running. See CONDITIONS FOR RUNNING . Did the DTC fail this ignition? If yes, go to step  2. If no, go to next step.
  11. Using the scan tool, observe the stored information in CAPTURE INFO. Does the scan tool display any DTCs that you have not diagnosed? If yes, see DIAGNOSTIC TROUBLE CODE DEFINITIONS . If no, system is okay at this time.
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