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Home >> Cadillac >> 2006 >> STS V >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - 4.4L - DTC P0506 To P2544 >> DTC P2227 >> Component Testing

Component Testing

IMPORTANT: You must perform the Circuit/System Testing before proceeding with the Component Test.
  1. Turn ON the ignition with the engine OFF and remove the BARO sensor.
  2. Install a 3A fused jumper wire between the 5-volt reference terminal C of the sensor and 5-volt reference.
  3. Install a jumper wire between the low reference terminal A of the sensor and ground.
  4. Install a jumper wire at the signal terminal B of the BARO sensor.
  5. Connect a DMM between the jumper wire from terminal B of the sensor and ground.
  6. Install the J 35555  to the BARO sensor vacuum port. Slowly apply vacuum to the sensor while monitoring the voltage on the DMM. The voltage should vary between 5.2-0 volts, without any spikes or dropouts.
    • If the voltage is not within the specified range or is erratic, replace the BARO sensor.
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