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Circuit/System Testing

WARNING: This page is about a different car, the 2008 Cadillac CTS. However, it is still accessible from the selected car via links, so may be relevant.
  1. Disconnect the EVAP purge solenoid valve electrical harness connector.
  2. Start the engine.
  3. Command the EVAP vent closed.
  4. Increase the engine speed to 1,200-1,500 RPM.
  5. Observe the fuel tank pressure sensor inches H2O with a scan tool.
  6. Verify the scan tool FTP sensor H2O parameter is -0.5 to +0.5 inches H2O.
    • If the FTP sensor in H2O parameter is greater than the specified range, replace the EVAP purge solenoid valve.
  7. With the engine OFF and the ignition ON, disconnect the EVAP purge solenoid valve pipe.
  8. Observe the FTP sensor in H2O parameter with a scan tool.
  9. Verify the FTP sensor is -0.5 to +0.5 inches H2O.
    • If the FTP sensor parameter is greater than the specified range, replace the FTP sensor.
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