P0441
Symptom: CHECK ENGINE lamp (MIL) on. Any other diagnostic trouble codes
(closed loop, misfiring)
EVAP canister purge valve, low flow
Symptom of fault
CHECK ENGINE lamp (MIL) on. Any other diagnostic trouble codes
(closed loop, misfiring)
Conditions
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Diagnosis not yet performed this
drive cycle
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Front heated oxygen sensor OK
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Coolant temperature >60°C (>140°F)
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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 is of no importance. Since a fault in the
purge valve's electrical circuit is indicated by a different diagnostic trouble code, fault
diagnosis concerns a mechanical fault. It is important to ensure that no hoses are pinched or
kinked.
Checking 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, ISAT scan
tool or test lamp while carrying out this check.
Diagnostic procedure
1. Check the air flow
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Unplug the purge valve's 2-
pin connector.
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Disconnect the hose on the
evaporative emission canister side of the valve.
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Start the engine and use the
pressure gauge on the pressure/vacuum pump to check that no air is sucked into the
valve.
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Is air sucked in?
Change the valve and proceed to point 4.
Continue with point 2.
2. Check the valve
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Switch off the engine and plug in
the purge valve's 2-pin connector.
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Start the engine and run it until the
temperature of the coolant exceeds
60°C (140°F), or for at least 1 minute if this temperature is reached earlier.
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Check that air is sucked into the
valve in pulses.
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Does the valve pulsate?
Continue with point 3.
Change the valve and proceed to point
4.
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Note
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The EVAP canister purge valve is active for 4 1/2 minutes and is then at rest for 1/2
minute and so on.
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3. Check the flow from the evaporative emission
canister
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Connect the pressure/vacuum
pump to the hose from the evaporative emission canister.
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Check that a steady flow is
obtained from the evaporative emission canister.
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Is a steady flow obtained?
Change the EVAP canister purge valve and continue with point
4.
Repair or replace the hose, change the evaporative emission canister if
necessary, and continue with point 4.
4. Final check
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Clear the diagnostic trouble
code.
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Perform a driving
cycle:
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Ignition switch in ON position, A/C
switched off and temperature sensor unplugged from the ICE so that the radiator fan runs
continuously
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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.
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Depress the accelerator a second
or two and then run the engine at idling speed for 30 seconds. Repeat three
times.
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Evaluation of the driving
cycle:
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Connect an ISAT scan
tool.
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Select
"DIAGNOSTIC STATUS".
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Does the ISAT scan tool show "NOT READY"?
Repeat the driving cycle.
Check whether the diagnostic trouble code has recurred.
Has the diagnostic trouble code recurred?
Proceed to
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The remedial measure taken was correct.
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Connect the temperature
sensor to the ICE.
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Clear the diagnostic trouble code
for the temperature sensor in the ICE.
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