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Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1638 (Engine Control System & Fuel System - 4.3L - DTC P0016 To P0336) >> DTC P0102 or P0103 >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2010 GMC Sierra and 2010 Chevrolet Silverado. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, disconnect the harness connector at the MAF/IAT sensor.
  2. Ignition OFF, all vehicle systems OFF, this may take up to 2 min, 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 MAF signal circuit terminal C 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.
  5. Ignition OFF, connect the red lead of the J 38522  to the MAF 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, replace the MAF/IAT sensor.
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