PRE-RELEASE
EVAP shut-off control valve (588)
| EVAP shut-off control valve (588) |
The shut-off valve is connected to the air supply connection on the evaporative emission canister and is powered from the main relay.
The valve is normally open.
With the engine running, the valve will only close during the tank integrity check.
With the shut-off valve closed, it should be possible to create and retain a vacuum in the tank with the help of the EVAP purge valve. Otherwise, the system is leaking and a diagnostic trouble code will be generated.
The shut-off valve is used for the tank integrity diagnosis. (Does not apply to ORVR without tank integrity diagnosis. This variant does not have a shut-off valve.)
The shut-off valve is supplied with power from the main relay and is controlled from Trionic pin 37.
Diagnostics
An open circuit or short circuit generates DTC P1444.If there is a short circuit to B+, diagnostic trouble code P1445 will be generated.
