Circuit/System Testing
WARNING: This page is about a different car, the 2006 Chevrolet Monte Carlo and 2006 Chevrolet Impala. However, it is still accessible from the selected car via links, so may be relevant.
- Start the engine.
- Seal the EVAP system using the Purge/Seal function with a scan tool.
- Observe the FTP sensor with a scan tool. The Fuel Tank Pressure Sensor parameter should be within -1 to +1 inch H2O.
- If the Fuel Tank Pressure Sensor parameter is within -1 to +1 inch H2O, the condition is intermittent.
- Disconnect the EVAP purge pipe from the EVAP canister purge solenoid valve.
- If the Fuel Tank Pressure Sensor is between -1 to +1 inch H2O, replace the EVAP canister purge solenoid valve.
- If the Fuel Tank Pressure Sensor parameter is NOT between -1 to +1 inch H2O, replace the FTP sensor.