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HOMESERVICE MANUALSCHEVROLET2001CAVALIER LS, 2.4 TREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 59 (ENGINE CONTROL SYSTEM - SELF-DIAGNOSTICS)DIAGNOSTIC TESTSDTC P0101: MAF SENSOR PERFORMANCEDIAGNOSTIC PROCEDURES
2001 Chevrolet Cavalier LS, 2.4 T

Diagnostic Procedures

2001 Chevrolet Cavalier LS, 2.4 TSECTION Diagnostic Procedures
WARNING: This page is about a different car, the 2003 Pontiac Vibe. However, it is still accessible from the selected car via links, so may be relevant.
  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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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.