LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Chevrolet >> 2007 >> Impala LTZ >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls And Fuel - 3.9L - DTC P0420 To DTC P3433 >> DTC P2227 >> Component Testing
April 5, 2026: LEMON Manuals is launched! Read the announcement.

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 3-amp 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 23738-A  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.
scientia non olet · About LEMON Manuals