Diagnostic Test

WARNING: This page is about a different variant/trim than selected.

CHECK THE EXHAUST GAS PRESSURE SENSOR TUBE AND PRESSURE SENSING PORTS
1. Make sure the pressure hose is connected to the sensor and exhaust manifold. If it is found to be disconnect, connect the hose and retest.
2. Remove the steel tube between the Exhaust Manifold and the Exhaust Gas Pressure Sensor port.
  Is the pressure hose and pressure sensor ports located in the manifold free from debris?
  
  Yes
  - Go To 2.
  No
  - Clean the hose and pressure sensing port.
  - Go To 2.
CHECK THE EXHAUST GAS PRESSURE SENSOR
1. Turn ignition switch on.
2. Wait five seconds after ignition switch is turned on.
3. With the scan tool, read DTCs.
  Is P0471 stored?
  
  Yes
  - Go To 3.
  No
  - Replace the Exhaust Gas Pressure Sensor in accordance with the Service Information. Refer to SENSOR, DIFFERENTIAL PRESSURE, REMOVAL .
  - Refer to STANDARD PROCEDURE and perform the POWERTRAIN VERIFICATION.
CHECK THE EXHAUST GAS PRESSURE SENSOR OPERATION
1. With the scan tool, erase DTCs.
2. Start the engine and let it idle for one minute.
3. With the scan tool, monitor the Exhaust Gas Pressure Sensor reading.
  Does the value fluctuate slightly, indicating the sensor is not stuck?
  
  Yes
  - Repair complete.
  - Refer to STANDARD PROCEDURE and perform the POWERTRAIN VERIFICATION.
  No
  - Replace the Exhaust Gas Pressure Sensor in accordance with the Service Information. Refer to SENSOR, DIFFERENTIAL PRESSURE, REMOVAL .
  - Refer to STANDARD PROCEDURE and perform the POWERTRAIN VERIFICATION.