Circuit/System Testing
WARNING: This page is about a different car, the 2010 Chevrolet Cobalt. However, it is still accessible from the selected car via links, so may be relevant.
IMPORTANT:
Perform the Circuit/System Verification before proceeding with the Circuit/System Testing.
- Start the engine.
- Seal the EVAP system using the Purge/Seal function with a scan tool.
- Command the EVAP canister purge solenoid valve to 50 percent.
- Observe the FTP sensor with a scan tool. The Fuel Tank Pressure Sensor parameter should be more than 2 volts within 60 seconds.
- If the Fuel Tank Pressure Sensor parameter is less than the specified range, repair the blocked purge path or replace the EVAP canister purge solenoid valve.