Possible Causes

Malfunction is detected when an excessively high voltage signal from the sensor is sent to ECM. Possible causes are:

• Harness or connectors (sensor circuit is open or shorted).
• Defective EVAP control system pressure sensor.
• Defective EVAP canister vent control valve.
• Defective EVAP canister.
• Defective water separator.
• Defective rubber hose from EVAP canister vent control valve to water separator.