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Home >> Hummer >> 2008 >> H3 Base, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 230 (Engine Controls And Fuel - 4.4L - DTC P0010 To DTC P0158) >> DTC P0107 or P0108 >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2008 Cadillac STS. However, it is still accessible from the selected car via links, so may be relevant.
  1. Verify the integrity of the MAP sensor system by inspecting for the following conditions:
    • Any damage to the MAP sensor housing
    • Any damage to the MAP sensor seal
    • A loose or improperly installed MAP sensor
    • A restriction in the vacuum source of the MAP sensor
  2. Ignition OFF, disconnect the harness connector at the MAP sensor.
  3. 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.
  4. Ignition ON, test for 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 an open/high resistance or a short to ground. 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.
  5. Verify the scan tool MAP sensor voltage parameter is less than 13 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.
  6. Install a 3A fused jumper wire between the signal circuit terminal B and the 5-volt reference circuit. Verify the scan tool MAP sensor parameter is greater than 253 kPa.
    • If less than the specified range, test the sensor signal circuit for high resistance.
  7. If all circuits test normal, test or replace the MAP sensor.
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