P0444

P0444
EVAP Canister Purge Valve - Open Circuit

Function
The fuel vapors from the fuel tank must not escape into the open air. For this reason, the ventilation line of the fuel tank is routed to an evaporative emission filter that retains the fuel vapors. When driving, air is drawn in through the evaporative emission filter which picks up the accumulated fuel vapors and feeds them to the combustion process. The EVAP canister purge valve is installed between the evaporative emission (EVAP) canister and intake system. The flow direction through the valve is indicated by an arrow on the plastic housing. The end stage that controls the EVAP canister purge valve is monitored.

Diagnosis conditions
A fault is detected and stored if the engine speed is over 80 1/min and if the battery voltage is between 7.5 Volt and 17 Volt.





Wiring diagram





Diagnostic procedure

Check voltage supply for EVAP canister purge valve.
1. Remove connector on EVAP canister purge valve.
2. Connect voltmeter (positive) to connector pin 1 of EVAP canister purge valve and ground.
3. Switch on ignition. Display: Battery voltage

Check EVAP canister purge valve.
1. Remove connector on EVAP canister purge valve.
2. Connect ohmmeter to EVAP canister purge valve pins 1 and 2.
- Display: 26 +/- 4 ohms at 20°C.

Check control line for EVAP canister purge valve.
1. Remove connector on EVAP canister purge valve.
2. Remove ECM connector.
3. Connect ohmmeter to EVAP canister purge valve pin 2 and ECM connector pin 61.
- Display: 0 - 5 ohms

NOTE: The line is routed via connector X 60 pin 19.