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Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1046 (Engine Controls And Fuel - 6.6L - DTC P0016 To DTC P02E0) >> DTC P0102 or P0103 >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2008 GMC Sierra, 2008 GMC Cab & Chassis Sierra, 2008 Chevrolet Silverado, and 2008 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
  1. Verify the integrity of the entire air induction system by inspecting for the following conditions:
    • Damaged components
    • Loose or improper installation
    • Restrictions or leaks in the air induction system
    • Water intrusion
    • In cold climates, inspect for any snow or ice build-up at the air cleaner and MAF sensor.
  2. Ignition OFF, disconnect the harness connector at the MAF/IAT sensor.
  3. Ignition OFF and scan tool disconnected for 90 seconds, test for less than 5 ohms between the MAF low reference circuit terminal 2 and ground.
    • If greater than the specified range, test the MAF low reference circuit for an open/high resistance. If the circuit tests normal, replace the ECM.
  4. Ignition OFF and scan tool disconnected for 90 seconds, test for less than 5 ohms between the IAT sensor 1 low reference circuit terminal 4 and ground.
    • If greater than the specified range, test the IAT sensor 1 low reference circuit for an open/high resistance. If the circuit tests normal, replace the ECM.
  5. Ignition ON, verify that a test lamp illuminates between the ignition 1 voltage circuit terminal 3 and ground.
    • If the test lamp does not illuminate, test the ignition 1 voltage circuit for a short to ground or an open/high resistance.
  6. Ignition ON, test for 4.8-5.2 volts between the MAF signal circuit and ground.
    • If less than the specified range, test the MAF signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the ECM.
    • If greater than the specified range, test the MAF signal circuit for a short to voltage. If the circuit tests normal, replace the ECM.
  7. Remove the Intake Manifold Tube. Refer to Intake Manifold Tube Replacement .
  8. Visually inspect the EGR valve and verify the valve is in the closed position.
    • If the EGR valve is not in the closed position, replace the EGR valve.
    • If the EGR valve inspection is normal, replace the MAF/IAT sensor.
  9. Ignition OFF, connect the red lead of the J 38522  to the signal circuit terminal A at the MAF/IAT sensor harness connector. Connect the battery voltage supply to B+, and ground the black lead.
  10. Set the J 38522  signal to 5 volts, the frequency to 5K, and the Duty Cycle to Normal.
  11. Engine idling, observe the scan tool MAP sensor parameter. The scan tool MAF Sensor parameter should be between 4,950-5,025 Hz.
    • If the MAF Sensor parameter is not within the specified range, replace the ECM.
    • If the MAF Sensor parameter is within the specified range, replace the MAF/IAT sensor.
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