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Circuit/System Verification

  1. If DTCs P0641 or P0651 are set, refer to Diagnostic Trouble Code (DTC) List - Vehicle for further diagnosis.
  2. With the engine running, observe and record the AIR Pressure Sensor voltage parameter. With the engine running, enable the AIR pump relay with a scan tool and observe that the AIR Pressure Sensor voltage parameter increases more than 0.4 volt during AIR pump operation.
  3. With the engine running, enable the AIR pump relay with a scan tool and observe that the AIR Pressure Sensor parameter equals approximately 10-15 kPa above BARO.
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