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Home >> Chevrolet >> 2009 >> Traverse LS, FWD >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System & Fuel System - 3.6L - DTC P0008 To DTC P0191 >> DTC P0101 >> Circuit/System Testing
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Circuit/System Testing

  1. Inspect for the following conditions:
    • An engine vacuum leak
    • An air leak in the intake air duct between the mass air flow (MAF) sensor and the throttle body
    • A plugged or collapsed intake air duct
    • Objects that block the MAF sensor air inlet
    • An air filter element that is restricted
    • The hydro-carbon absorber in the air cleaner assembly for ruptures or deterioration, if equipped.
    • A restricted throttle plate or for carbon build-up around the throttle plate
    • An unseated engine oil dip stick
    • A loose or missing engine oil fill cap
    • An over filled crankcase
    • If you find any of the above conditions, repair as necessary.
  2. Ignition OFF, disconnect the harness connector at the MAF sensor.
  3. Ignition OFF, test for less than 5 Ω between the ground circuit terminal C and the battery ground.
    • If greater than the specified range, test the ground circuit for an open/high resistance.
    4. CAUTION: Do NOT use the low reference circuit in the component harness connector for this test. Damage to the control module may occur due to excessive current draw.
  4. Ignition ON, load test the ignition circuit for B+ between terminal B and ground.
    • If less than the specified value, test the ignition circuit for an open/high resistance.
  5. Test for 4.8-5.2 V between the signal circuit terminal A and the ground circuit terminal C.
    • If less than the specified range, test the signal circuit for an open/high resistance or a short to ground. If the circuit/connections test normal, replace the ECM.
    • If greater than the specified range, test the signal circuit for a short to voltage. If the circuit/connections test normal, replace the ECM.
  6. Ignition OFF, connect the red lead of the J 38522  to the signal circuit terminal A at the MAF/IAT sensor harness connector. See Special Tools . Connect the battery voltage supply to B+, and ground the black lead.
  7. Set the J 38522  Signal switch to 5 V, the Frequency switch to 5K, and the Duty Cycle switch to Normal. See Special Tools .
  8. Ignition ON, observe the scan tool MAF Sensor frequency parameter. The parameter should be between 4, 950-5, 025 Hz.
    • If the parameter is not within the specified range, replace the ECM.
  9. If all circuits/connections test normal, replace the MAF sensor.
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