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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 P0100-P0103 › Circuit/System Testing

Circuit/System Testing

  1. Verify the integrity of the entire air induction system by inspecting for the following conditions:
    • Any damaged components
    • Loose or improper installation
    • An air flow restriction
    • Any vacuum leak
    • Water intrusion
    • In cold climates, inspect for any snow or ice buildup
    • The MAF sensor element for contamination
    • If you find any of the above conditions, repair as necessary.
  2. Ignition OFF, disconnect the harness connector at the B75B MAF/IAT 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 B75B MAF sensor harness connector. Connect the battery voltage supply to B+, and the black lead to ground.
  7. Set the J 38522:  Variable Signal Generator Signal switch to 5 V, the Frequency switch to 5 K, 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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