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Home › Chevrolet › 2011 › Camaro LS, Automatic › Repair and Diagnosis › Engine Performance › System › Engine Controls And Fuel - 3.6L - DTC P0008 Through P0191 › DTC P0101 › Circuit/System Testing

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, if equipped, in the air cleaner assembly for ruptures or deterioration.
    • 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 B75B MAF sensor.
  3. Ignition OFF, all vehicle systems OFF, this may take up to 2 min, test for less than 5 Ω between the ground circuit terminal 2 and 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, verify that a test lamp illuminates between the ignition circuit terminal 4 and ground.
    • If the test lamp does not illuminate, test the ignition circuit for a short to ground or an open/high resistance. If the circuit tests normal and the ignition circuit fuse is open, test all the components connected to the ignition circuit and replace as necessary.
  5. Test for 4.8-5.2 V between the signal circuit terminal 5 and the ground circuit terminal 2.
    • 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 K20 ECM.
    • If greater than the specified range, test the signal circuit for a short to voltage. If the circuit/connections test normal, replace the K20 ECM.
  6. Ignition OFF, connect the red lead of the J 38522:  Variable Signal Generator to the signal circuit terminal 5 at the B75 MAF sensor harness connector. Connect the battery voltage supply to B+, and ground the black lead.
  7. Set the J 38522:  Variable Signal Generator Signal switch to 5 V, the Frequency switch to 5K, and the Duty Cycle switch to Normal.
    8. NOTE: If the engine stalls, connect the red lead of the J 38522:  Variable Signal Generator to the signal circuit terminal 5 at the B75B MAF sensor harness connector after the engine is already at idle.
  8. Engine at idle, observe the scan tool MAF Sensor frequency parameter. The parameter should be between 4,950-5,050 Hz.
    • If not within the specified range, replace the K20 ECM.
  9. If all circuits/connections test normal, replace the B75B MAF sensor.
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