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Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> External Pages >> Different car >> Section 370 (Engine Controls And Fuel - Hybrid (LZ1) - DTC P0010 Through DTC P0341) >> Diagnostic Information and Procedures >> DTC P0102 or P0103 >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2011 GMC Yukon, 2011 Chevrolet Tahoe, and 2011 Cadillac Escalade. However, it is still accessible from the selected car via links, so may be relevant.
IMPORTANT:

All electrical components and accessories must be turned OFF and allowed to power down.

  1. Ignition OFF, disconnect the harness connector at the MAF/IAT sensor.
  2. Ignition OFF and all vehicle systems OFF. It may take up to 2 minutes for all vehicle systems to power down. Test for less than 5 Ω between the ground circuit terminal E and ground.
    • If greater than the specified range, test the ground circuit for an open/high resistance.
  3. Ignition ON, verify that a test lamp illuminates between the ignition circuit terminal D and ground.
    • If the test lamp does not illuminate, test the ignition circuit for a short to ground or an open/high resistance.
  4. Ignition ON, test for 4.8-5.2 V between the signal circuit terminal C 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 ECM.
    • If greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the ECM.
  5. Ignition OFF, connect the red lead of the J 38522 to the signal circuit terminal C at the MAF/IAT sensor harness connector. Connect the battery voltage supply to B+, and the black lead to ground.
  6. Set the J 38522 signal to 5 V, the Frequency to 5K, and the Duty Cycle to Normal.
  7. Engine idling, observe the scan tool MAF Sensor parameter. The reading should be between 4, 950-5, 050 Hz.
    • If not within the specified range, replace the ECM.
  8. If all circuits test normal, test or replace the MAF/IAT sensor.
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