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Circuit/System Testing

WARNING: This page is about a different car, the 2008 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.
  1. Start the engine.
  2. Seal the EVAP system using the Purge/Seal function with a scan tool.
  3. Command the EVAP canister purge solenoid valve to 50 percent.
  4. Observe the FTP sensor with a scan tool. The Fuel Tank Pressure Sensor parameter should be more than 2 volts after 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.
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