E39 / P0442 00
Read the instructions below then
start the fault diagnostic procedure.
Symptom: Check Engine
Possible smell of petrol.
EVAP. Small Leakage in System.
Fault symptom
Check Engine
Possible smell of petrol.
On-board diagnosis
Type of diagnosis:
| Once per driving cycle. Stopped when fault criteria are fulfilled or OK reported. |
| The diagnosis is cancelled if the ignition is turned on or if refuelling is carried out. |
| The diagnosis runs after engine shut off. |
Enable criteria:
| Engine running more than 10 minutes. |
| Fuel level between 10% and 90%. |
| Distance covered is more than 5 km in the last driving cycle. |
| Vehicle speed over 15 km/h |
| More than 17 hours since the last test was performed. |
| At least 10 hours must have passed if the last test is interrupted by e.g. ignition on or refuelling. |
| Ambient temperature between 0-34°C. |
| NONE of the following DTCs must be detected: |
| P0116, P0117, P0118, P0119 |
| P0451, P0452, P0453, P0454, P0455 |
| P2227, P2228, P2229, P2230 |
| ____________________________________ |
| • | The diagnosis is performed by closing the cut-off valve and the pressure will initially increase and then decrease as the fuel cools. When the pressure has dropped 62 Pa from the highest measured pressure, the cut-off valve opens for 60 s to pressure equalise the system. The valve is then closed. |
| • | The fuel continues to cool and a vacuum is formed. When the pressure has dropped 62 Pa from when pressure equalizing has occurred, the diagnosis is finished. |
Fault criteria:
| An insufficient pressure change corresponds to a small leak, a hole of a diameter of 0.5 and greater. |
System reaction to a fault:
OK report:
| Diagnostics carried out without fault reported. |
Fault handling:
| (See section Fault handling III, "Other emission-related components and functions" for more information.) |
Diagnostic help
Diagnosis regards:
| A small leakage of more than 0.5 mm. |
| An improperly screwed fuel cap is often the reason this diagnostic trouble code is generated. Before beginning fault diagnosis, check that the tank cap is properly fitted. |
Functions in the diagnostic tool related to the fault:
| (See also description of readings/activations in diagnostic tool) |
