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Home >> Cadillac >> 2009 >> STS V >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls And Fuel - 4.4L - DTC P0010 To DTC P0158 >> DTC P0107 or P0108 >> Circuit/System Testing

Circuit/System Testing

  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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