P0441

EVAP CANISTER PURGE VALVE, LOW FLOW





Fault Symptoms
CHECK ENGINE lamp (MIL) on.
Any other diagnostic trouble codes (closed loop system, misfiring).

Conditions.
P0441
^ Diagnosis not yet performed this driving cycle.
^ Front heated oxygen sensor (1) OK.
^ Speed = 0 km/h.
^ Idling.
^ Closed loop active.
^ Coolant temperature >60°C (>140°F).
^ No load changes
^ Steady idling speed.
Additional fuel from purging <10% of engine fuel needs and no change in closed loop or idle speed control when purging activated.





Diagnostic Help
The diagnostic trouble code indicates that the flow through the purge valve is too low.
Whether air or fuel vapour is sucked through the valve makes no difference.
It is important to ensure that no hoses are pinched or kinked. M97 has no diagnosis for the valve's electrical circuit. Diagnostic trouble code P0441 is generated for electrical faults also.
The purge valve can be activated with the diagnostics tool.
- Select "ACTIVATE".
- Select "EVAP VALVE".
The valve will be activated for 10 seconds at 8 Hz 50%. When activated, the valve will click.

Check The Wiring.
Intermittent faults may occur as a result of occasional short circuits and breaks in the wiring. Jiggle the leads and in-line connectors at several places and in different directions to reveal faults in the wiring harness. Observe the multimeter, diagnostics tool or test lamp while carrying out this check.





1. Check the valve and the leads connected to it.
- Unplug connector H6-5 (located behind the right-hand direction indicator).
- Take a resistance reading on the male connector across:
^ pins 5 and 6.
The nominal value is 26 ±3 ohms.

Is the reading OK?
YES
^ Continue with point 2.
NO
^ Repair or replace the lead or, if necessary, change the valve.
Continue with point 6.





2. Check the valve's power supply
- Start the engine and run it at idling speed.
- Connect the test lamp to the female connector between:
^ pin 6 and battery negative (B-).

Did the test lamp light up?
YES
^ Continue with point 3.
NO
^ Repair or replace the lead between pin 6 and the crimped connection (J37). Continue with point 6.





3. Check the valve's ground connection.
- Check the lead between pin 5 of the female
connector and pin 27 of the control module.

Is the wiring harness OK?
YES
^ Continue with point 4.
NO
^ Rectify the fault.
Continue with point 6.





4. Check the valve
- Ignition switch in the OFF position.
- Disconnect the purge valve hose from the intake manifold.
- Connect the pressure/vacuum pump and build up a vacuum. The pressure must not rise.

Is the pressure rising?
YES
^ Repair or replace the valve hose.
Continue with point 6.
NO
^ Ignition switch in OFF position.
Continue with point 5.





5. Check the air flow
- Start the engine and run it at idling speed until the temperature of the coolant rises above 60°C (140°F), or for at least 1 minute.
- Reconnect the pressure/vacuum pump and build up a vacuum.
A steady flow should now be obtained from the evaporative emission canister via the valve (the sound of the valve pulsating can also be heard in the hose).

Is a steady flow obtained?
YES
^ Connect the hose.
Continue with point 6.
NO
^ Repair or replace the hose. Change the valve or evaporative emission canister. Continue with point 6.

Note The EVAP canister purge valve is active for 4 1/2 minutes and is then at rest for 1/2 minute and so on.









6. Final check
- Clear the diagnostic trouble code.
- Implement a driving cycle:
^ Ignition switch in the ON position, turn off the A/C and unplug the temperature sensor connector from the EDU.
^ Connect a jumper lead so that the radiator fan runs continuously.
^ Start the engine and run it at idling speed until the temperature of the coolant rises above 60°C (140°F), or for at least 1 minute.
^ Floor the accelerator for a second or two and then let the engine run at idling speed for 30 seconds. Repeat this 3 more times.
- Evaluate the driving cycle:
^ Connect the diagnostics tool.
^ Select "READ ON/OFF".
^ Select "DIAGNOSTIC STATUS".
^ Select "EVAP".

Does the ISAT scan tool show "NOT READY"?
YES
^ Repeat the driving cycle.
NO
^ Check whether the diagnostic trouble code has recurred.

Has the diagnostic trouble code recurred?
YES
^ Continue with "Before Replacing A Control Module". Component Tests and General Diagnostics
No
^ The steps taken to rectify the fault were correct.
- Connect the temperature sensor to the EDU
- Clear the diagnostic trouble code for the temperature sensor in the EDU.