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Home >> Chevrolet >> 2012 >> Orlando LS, Automatic Trans >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls/Fuel - 2.4L - Diagnostic Information And Procedures >> Diagnostic Information and Procedures >> DTC P0101 >> Circuit/System Testing
July 1: So it begins. Don't worry, this is not in the correct legal jurisdiction!

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 B75B mass air flow /intake air temperature sensor element for contamination.
  2. Ignition OFF, disconnect the harness connector at the B75B mass air flow /intake air temperature 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. 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 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 5 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.
    • 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 red lead of the J 38522  variable signal generator to the signal circuit terminal 5 at the harness connector. Connect the battery voltage supply to B+, and the black lead to ground.
  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 B75B mass air flow /intake air temperature sensor.
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