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Home >> Chevrolet >> 2012 >> Traverse LS, AWD >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls/Fuel - 3.6L - DTC P0010 To DTC P0338 >> Diagnostic Information and Procedures >> DTC P0101 >> Circuit/System Testing
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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 leaks
    • Water intrusion
    • In cold climates, inspect for any snow or ice buildup
    • Inspect the B75C Multifunction Intake Air Sensor element for contamination.
  2. Ignition OFF, disconnect the harness connector at the B75C Multifunction Intake Air 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 7 and ground.
    • If greater than the specified range, test the ground circuit for an open/high resistance.
  4. Ignition ON, verify that a test lamp illuminates between the ignition circuit terminal 5 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 fuse is open, test all the components connected to the circuit and repair or replace as necessary.
  5. Ignition ON, test for 4.8-5.2 V between the signal circuit terminal 6 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 K20 engine control module.
      • NOTE:

      If the signal circuit is shorted to a voltage the ECM or the sensor may be damaged.

    • If greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the K20 engine control module.
  6. Ignition OFF, connect the leads of the J 38522  Variable Signal Generator as follows:
    • Red lead to the signal circuit terminal 6 at the harness connector
    • Black lead to ground
    • Battery voltage supply lead to B+
  7. Set the J 38522  Variable Signal Generator to the following specifications.
    • Signal switch to 5 V
    • Duty Cycle switch to 50 % (Normal)
    • Frequency switch to 5 KHz
  8. Engine idling, observe the scan tool MAF Sensor parameter. The scan tool MAF Sensor parameter should be between 4,950-5,050 Hz.
    • If the parameter is not within the specified range, replace the K20 engine control module.
  9. If all other circuits test normal, test or replace the B75C Multifunction Intake Air Sensor.
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