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P0441

Read the instructions below then start the fault diagnostic procedure.

Symptom: CHECK ENGINE.

P0441


EVAP Purge Valve. Malfunction.


Fault symptoms


• CHECK ENGINE.


On-Board Diagnostics

Type of diagnosis:


- Once per driving cycle. Interrupted when fault criteria fulfilled or OK reported. Restarts next driving cycle.


Test 1

Enable criteria


- Coolant temperature when starting between 5-40°C. Purging is not active. Idling speed. Max. one change of status of the brake light switch. Volume of fuel in tank between 9-54 litres. The vehicle at a standstill for 5 sec.

When the above conditions are fulfilled for more than 5 sec. the diagnosis will start. Should the diagnosis be interrupted the speed must exceed 0 on one occasion before the diagnosis is allowed to be restarted. The diagnosis continues then as follows: The shut-off valve is activated at the same time as the purging is interrupted for 3 sec. During this time the tank pressure is being observed.


Test 2

Enable criteria


- Coolant Temperature when starting between 5-40°C. The difference between the coolant temperature and intake air temperature is less than 5°C. If the above conditions are not fulfilled a special test (warm start) will be carried out instead. (Test 3). Idling speed. Max. one change of status of the brake light switch. The volume of fuel in tank between 9-54 litres. Purging adaptation greater than -15%. Intake air pressure at least 20 kPa lower than the atmospheric pressure. The vehicle at a standstill for 5 sec. Battery voltage between 10-16 Volts. Tank pressure between -300 and 100 Pa.

The diagnosis will start once the above conditions have been fulfilled. If the diagnosis is interrupted then the speed must exceed 0 on one occasion before it is allowed to restart. The diagnosis continues then as follows: The shut-off valve is activated (closed) at the same time as any purging is interrupted for 4.5 sec. The tank pressure is observed, decreasing pressure reveals a leaking canister purge valve. Increasing pressure by more than 3 Pa/s indicates fuel evaporation, in these cases the diagnosis is repeated. If the pressure continues to rise by more than 3 Pa/s the diagnosis ceases. When the pressure increases less then 3 Pa/s Test 2 is complete.


Fault criteria

Test 1


- If the pressure drops more than 40 Pa/s then an internal leakage in the canister purge valve has been detected.


Fault criteria

Test 2:


- If the pressure drops more than 27.5 Pa/s then an internal leakage in the canister purge valve has been detected. If the pressure increases by more than 3 Pa/s then there is major fuel evaporation, Test 2 will then be repeated. If it then continues to rise by more than 3 Pa/s the diagnosis ceases. To enable the diagnosis to be restarted the vehicle must be put in motion. When the pressure increases less than 3 Pa/s the diagnosis is complete.


Generating diagnostic trouble codes


- Diagnostic trouble codes P0441 and P1441 are generated when the fault criteria are fulfilled in Test 1 or Test 2 within the same driving cycle and dependents are OK.


Dependents


- P0444, P0445, P0501, P0502, P0506, P0507, P1444, P1445, P1576 and P1577.


System reaction to a fault


- None


OK report


- Test 1 or Test 2 performed once and fault criteria not fulfilled.


Fault handling: (For more information, see Fault handling III, other emission-related components and functions )


- Type III.


Diagnostic help

Fault diagnosis concerns a valve fault.

Functions in the diagnostic tool related to the fault:


• Diagnostic status for the diagnosis.

• Activating EVAP diagnosis.


For more information, see Menu "Read Values" .

Note

During the final check of a rectified fault, the diagnostic tool activation command must be used so that Test 1 is initiated irrespective of starting temperature.