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Home >> Pontiac >> 2009 >> G3 Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls And Fuel - 1.6L (LXV) >> Diagnostic Information and Procedures >> DTC P0101 >> Circuit/System Testing
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Circuit/System Testing

  1. Ignition OFF, disconnect the harness connector at the MAF/IAT sensor.
  2. Ignition OFF, test for less than 5 ohms between the ground circuit terminal B and ground.
    • If greater than the specified range, repair the ground circuit for an open/high resistance.
  3. Ignition ON, load test for B+ between the ignition voltage circuit terminal C and ground.
    • If less than the specified range, test the ignition voltage circuit for a short to ground or an open/high resistance.
  4. Ignition ON, test for 4.8-5.2 volts between the signal circuit terminal A and ground.
    • If less than the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the ECM.
    • If greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the ECM.
  5. Ignition OFF, connect the red lead of the J 38522  to the signal circuit terminal A at the MAF/IAT sensor harness connector. Connect the battery voltage supply to B+, and ground the black lead.
  6. Set the J 38522  to the following specifications:
    • Signal switch to 5 volts
    • Frequency switch to 5K
    • Duty Cycle switch to Normal
  7. Engine idling, observe the scan tool MAF Sensor parameter. The scan tool MAF Sensor parameter should be between 4,950-5,025 Hz.
    • If not within the specified range, replace the ECM.
  8. If the circuits test normal, replace the MAF/IAT sensor.
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