Important Safety Notice
Appropriate repair methods and procedures are essential for the safe, reliable operation of all motor vehicles, as well as the personal safety of the individual doing the work. This article provides general directions for repairing vehicles with tested, effective techniques. Following them will help ensure reliability. There are numerous variations in procedures, techniques, tools, and parts for repairing vehicles, as well as in the skill of the individual doing the work. This article cannot possibly anticipate all such variations and provide advice or cautions as to each. Accordingly, anyone who departs from the instructions provided in this article must first establish that they compromise neither their personal safety nor the vehicle integrity by their choice of methods, tools, or parts.
The use of a soap solution around the fuel filler cap or the use of the hydrocarbon emission analyzer to determine an evaporative emission system leak is not recommended. The mandatory Rotunda Evaporative Emission System Leak Tester for OBD II (including the ultra-sonic tester) and the Rotunda Vacutec 522 Leak Detector Smoke Machine are the only devices to be used at this time for evaporative emission system leak detection.
This pinpoint test is intended to diagnose the following:
- Canister vent (CV) solenoid (9F945).
- Fuel filler cap (9030).
- Fuel tank pressure (FTP) sensor (9C052).
- EVAP canister purge (EVAPCP) valve (9C915). Also known as the vapor management valve (VMV).
- Fuel tank isolation valve (FTIV) (9G712).
- EVAP system leaks using the Rotunda Vacutec Leak Detector Smoke Machine.
- Harness circuits: CV, EVAPCP, FTP, FTIV, SIGRTN, VPWR, VREF, and PWRGND.
- Powertrain control module (PCM) (12A650).