For 1990-2009 cars

(1) | The Service Port
(2) | The Purge Valve
(3) | The Vacuum Source Pipe
(4) | The Throttle Body
(5) | The Fuel Tank Pressure Sensor
(6) | The Fuel Tank
(7) | The Fuel Filler Cap
(8) | The Vapor Pipe
(9) | The Vent Valve
(10) | The Vent Pipe
(11) | The Purge Pipe
(12) | The Vapor Canister

Always start with the Powertrain On-Board Diagnostic (OBD) system check. This will reduce diagnostic time and prevent unnecessary parts replacement. The Enhanced Evaporative Emission (EVAP) control system diagnosis is covered in the following DTCs:

• | DTC P0440 -- EVAP System

• | DTC P0443 -- EVAP Purge Valve Control

• | DTC P0446 -- EVAP Vent Valve Control

• | DTC P0450 -- EVAP Fuel Tank Pressure Sensor Circuit

• | DTC P0455 -- EVAP System Large Leak Detected

### System Inspection and Cleaning

Important: Disconnect the hoses/pipes from the EVAP canister and the EVAP purge valve before applying compressed nitrogen.

Disconnect the vacuum source line at the purge valve and the manifold vacuum source. Remove the EVAP purge valve. Disconnect the purge line at the canister. Inspect all of the hoses/pipes/components for contamination. If a component is malfunctioning due to contamination, the component must be replaced. Contaminated of the hoses/pipes should be blown out with compressed nitrogen from the EVAP pressure/purge cart J 41413.

If carbon contamination of the system is evident, replace EVAP canister.

### Visual Check of EVAP Canister

If the canister is cracked, damaged, or carbon contamination of the system is evident, replace the EVAP canister.