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Home >> Pontiac >> 2003 >> Vibe Base, AWD >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - Self-Diagnostics >> Diagnostic Tests >> DTC P0101: MAF Sensor Performance >> Diagnostic Procedures
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Diagnostic Procedures

  1. Perform diagnostic system check - engine controls. If yes, go to next step. If no, go to DIAGNOSTIC SYSTEM CHECK - ENGINE CONTROLS  under SELF-DIAGNOSTIC SYSTEM.
  2. Install scan tool. Check for any other DTCs. Repair any other DTCs first. Are there any other DTCs set? If yes, go to DIAGNOSTIC TROUBLE CODE DEFINITIONS . If no, go to next step.
  3. Check for any of the following conditions:
    • Any objects blocking MAF sensor inlet.
    • Any intake manifold vacuum leaks.
    • Any throttle body vacuum leaks.
    • A faulty, missing, or incorrectly installed PCV valve.
    Repair as necessary. Was a repair necessary? If yes, go to step  7. If no, go to next step.
  4. Turn ignition switch to RUN position, engine OFF. Using scan tool, place control module into CHECK MODE. See SERVICE BAY TESTS  under SELF-DIAGNOSTIC SYSTEM. Operate vehicle within freeze frame conditions. Is DTC P0101 set? If yes, go to next step. If no, go to DIAGNOSTIC AIDS .
  5. Check for the following conditions:
    • Check for poor connections in MAF sensor circuits.
    • Check for high resistance in MAF sensor electrical circuits.
    • Check for at least 11 volts on ignition positive voltage circuit.
    Repair as necessary. Was a repair necessary? If yes, go to step  7. If no, go to next step.
  6. Replace MAF sensor. After repair, go to next step.
  7. Use scan tool to clear DTCs. Turn ignition OFF for 30 seconds. Start engine. Operate vehicle within CONDITIONS FOR RUNNING DTC . Does DTC run and pass? If yes, go to next step. If no, go to step  2.
  8. Using scan tool, observe stored information, CAPTURE INFO. Does scan tool display any DTCs that you have not diagnosed? If yes, go to DIAGNOSTIC TROUBLE CODE DEFINITIONS . If no, system is okay at this time.
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