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Home >> GMC >> 2006 >> Sierra 1500 HD, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1046 (Engine Controls And Fuel - 6.6L - DTC P0016 To DTC P02E0) >> DTC P0106 >> 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.
IMPORTANT: You must perform the Circuit/System Verification before proceeding with the circuit/system testing.
IMPORTANT: You must perform the Repair Verification after completing the circuit/system testing.
  1. Verify the integrity of the entire air induction system by inspecting for the following conditions:
    • Damaged components
    • Loose or improper installation
    • An air flow restriction or leak
    • Any snow or ice build-up in the air cleaner or MAF Sensor
    • Any ice, water, coking, or restrictions at the MAP Sensor Port
  2. Ignition ON, engine OFF, observe the scan tool BARO parameter. Compare the BARO parameter to the range specified in the Altitude Vs. Barometric Pressure table. Refer to Altitude Versus Barometric Pressure .
    • If the BARO parameter is outside the range specified, replace the ECM.
  3. Ignition OFF, disconnect the harness connector at the MAP sensor.
  4. Ignition OFF for 90 seconds, test for less than 5 ohms between the low reference circuit terminal A and ground.
    • If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the ECM.
  5. Ignition ON, test for the 4.8-5.2 volts between the 5-volt reference circuit terminal C and ground.
    • If less than the specified range, test the 5-volt reference 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 5-volt reference circuit for a short to voltage. If the circuit tests normal, replace the ECM.
  6. Verify the scan tool MAP parameter is less than 45 kPa.
    • If greater than the specified range, test the signal circuit terminal B for a short to voltage. If the circuit tests normal, replace the ECM.
  7. Install a 3A fused jumper wire between the signal circuit terminal B and the 5-volt reference circuit terminal C. Verify the scan tool MAP parameter is greater than 253 kPa.
    • 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.
  8. If all circuits test normal, test or replace the MAP sensor.
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