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Home › Hummer › 2009 › H3 Alpha › Repair and Diagnosis › Engine Performance › System › Engine Controls And Fuel - 5.3L - DTC P0016 To DTC P0308 › DTC P0107 or P0108 › Circuit/System Testing

Circuit/System Testing

IMPORTANT: All electrical components and accessories must be turned OFF and allowed to power down.
  1. Ignition OFF, disconnect the MAP harness connector at the MAP sensor.
  2. Ignition OFF for 90 seconds, test for less than 5 ohms between the low reference circuit pin A and ground.
    • If greater than the specified range, test the low reference circuit pin A for an open/high resistance. If the circuit tests normal, replace the ECM.
  3. Ignition ON, test for 4.8-5.2 volts between the 5-volt reference circuit pin C and ground.
    • If less than the specified range, test the 5-volt reference circuit pin C 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 pin C for a short to voltage. If the circuit tests normal, replace the ECM.
  4. Verify the scan tool MAP Sensor parameter is less than 12 kPa.
    • If greater than the specified range, test the signal circuit pin B for a short to voltage. If the circuit tests normal, replace the ECM.
  5. Install a 3A fused jumper wire between the signal circuit pin B and the 5-volt reference circuit. Verify the scan tool MAP Sensor parameter is greater than 103 kPa.
    • If less than the specified range, test the signal circuit pin B for a short to ground or an open/high resistance. If the circuit tests normal, replace the ECM.
  6. If all circuits test normal, test or replace the MAP sensor.
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