3. Checking the Fuel Tank Pressure Sensor

ECM-4047 CANISTER PURGE (CP) VALVE/CANISTER SHUT OFF VALVE
LEAK DIAGNOSTIC

Checking the fuel tank pressure sensor



- Open the fuel tank filler cap.
- Start the engine and let it idle.
Read the fuel tank pressure.

Hint: The fuel tank pressure must be higher than -10 hPa. The normal value is close to 0 hpa. If uncertain of the function of the fuel tank pressure sensor, try connecting another fuel tank pressure sensor.

Remedy as necessary.

Is the fuel tank pressure OK?
Yes - Continue below.
No - Skip to "Verification information"


Checking the Canister Purge (CP) Valve



- Disconnect the hose between the canister purge (CP) valve and the EVAP canister from the canister purge (CP) valve.
- Start the engine and let it idle.

Hint: Listen to or feel the valve to ensure that it is not activated. The signal can be stopped in the event of uncertainty. Feel with fingers or connect a vacuum gauge to the valve connection to determine whether there is leakage when the canister purge (CP) valve is off. There must not be any leakage.

Other information:
- To access/replace the canister purge (CP) valve, Canister Purge (CP) Valve, Replacing

Is the canister purge (CP) valve OK?
Yes - Continue below.
No - Skip to "Verification information"


Checking hoses
Check whether the EVAP canister shut-off valve is not sealed.
Check whether the EVAP canister shut-off valve filter is not sealed.
Check the hose between the EVAP canister and the EVAP canister shut-off valve. Check the hose between the EVAP canister shut-off valve and its filter. Check whether these hoses are not sealed.
Check whether the EVAP canister shut-off valve terminal in the EVAP canister is not sealed.

Remedy as necessary.

Other information:
- To access/replace the EVAP canister shut-off valve, EVAP Canister Shut-Off Valve, Replacing


Verification information
Hint: After carrying out the check and the repair, check that the fault has been remedied.

Continue with "Starting the Quick Test" 2. Starting the Quick Test