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Circuit/System Testing

  1. Ignition OFF, disconnect the harness connector at the BARO sensor.
  2. Ignition OFF for 90 seconds, test for less than 5 Ω between the low reference circuit terminal 2 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 4.8-5.2V between the 5V reference circuit terminal 1 and ground.
    • If less than the specified range, test the 5V 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 5V reference circuit for a short to voltage. If the circuit tests normal, replace the ECM.
  4. Verify the scan tool BARO sensor parameter is less than 5 kPa.
    • If greater than the specified range, tests the signal circuit terminal 3 for a short to voltage. If the circuit tests normal, replace the ECM.
  5. Install a 3A fused jumper wire between the signal circuit terminal 3 and the 5V reference circuit terminal 1. Verify the scan tool BARO sensor parameter is greater than 120 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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