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Home >> Pontiac >> 2007 >> Grand Prix GXP >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 6 (Engine Controls & Fuel - 3.8L - DTC P0601 To U0107) >> DTC P2228 or P2229 >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different variant/trim than selected.
  1. Ignition OFF, disconnect the harness connector at the BARO sensor.
  2. Ignition OFF, allow sufficient time for the control module to power down. Measure for less than 5 ohms of resistance between the low reference circuit of the connector and a good 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.
  3. Ignition ON, test for 4.8-5.2 volts between the 5-volt reference circuit 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.
  4. Verify the scan tool BARO sensor voltage parameter is less than 10 kPa.
    • If greater than the specified range, tests the signal circuit for a short to voltage. If the circuit tests normal, replace the ECM.
  5. Install a 3-amp fused jumper wire between the signal circuit and the 5-volt reference circuit. Verify the scan tool BARO sensor parameter is greater than 199 kPa.
    • If less than the specified range, test the sensor signal circuit for an open/high resistance or a short to ground.
  6. If all circuits test normal, test or replace the BARO sensor.
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