P0445

P0445
EVAP Canister Purge Valve- Short 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 control line for EVAP canister purge valve for short circuit to B+.
1. Remove connector at EVAP canister purge valve.
2. Remove ECM connector.
3. Connect voltmeter (positive) to EVAP canister purge valve connector pin 2 and ground.
4. Switch on ignition. Display: 0 Volt
- If battery voltage is displayed, check wiring harness for trapped locations and abrasions.

Check control line for EVAP canister purge valve for short circuit to ground.
1. Remove connector at EVAP canister purge valve.
2. Remove ECM connector.
3. Connect ohmmeter to EVAP canister purge valve connector pin 2 and ground.
- Display: infinite resistance
- If 0 to 5 ohms is displayed, check wiring harness for trapped locations and abrasions.