T8 / P0442 00
Read the instructions below then
start the fault diagnostic procedure.
Symptom: Fault indicator lamp (for further information see WIS Fault diagnosis, general)
Possible smell of petrol.
EVAP. Small Leakage in System.
Fault symptom
Fault indicator lamp (for further information see WIS Fault diagnosis, general)
Possible smell of petrol.
On-board diagnosis
Type of diagnosis:
| Once per driving cycle. Stopped when fault criteria are fulfilled or OK reported. |
Enable criteria:
| • | The diagnosis is performed by closing the shut-off valve and opening the evap canister purge valve while the tank pressure is being registered. The pressure should then drop. |
| • | Bleeder valve closed; pressure increase in Pa/s calculated. Pressure must not rise too much. |
| Diagnostics can be carried out under 4 different operating conditions: |
| • | After cold start while stationary. |
| • | After cold start while driving. |
| • | After warm start while stationary. |
| • | After warm start while driving. |
| NONE of the following DTCs must be detected: |
| Diagnostics uses different calibration data for various operating conditions. Starting from cold implies an intake and radiator temperature below 40°C during start. Criteria for starting from cold are valid during 15 minutes after start. Several conditions can interrupt diagnostics. After starting from cold, diagnostics restarts immediately if the vehicle speed exceeds 0 km/h. After warm start, a speed of over 44 km/h is required for a specific period of time before diagnostics restarts. |
| Normally, the diagnosis takes 5 minutes with the engine idling if the intake temperature is above +15°C. |
Fault criteria:
| Pressure increase during phase 2 has been calculated and compared with the fuel level in the tank. The pressure increase indicates a small leak; a hole with a diameter of 1.0 - 2.5 mm. |
Dependent:
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:
| Small leak, 1.0 - 2.5 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) |
