T8 / P1492 00
Read the instructions below then
start the fault diagnostic procedure.
Symptom: Fault indicator lamp (for further information see WIS Fault diagnosis, general)
EVAP System, Fuel Level Sensor Failure and Tank Pressure Sensor Value too Low
Fault symptom
Fault indicator lamp (for further information see WIS Fault diagnosis, general)
On-board diagnosis
Type of diagnosis:
| Once per driving cycle. Stopped when fault criteria are fulfilled or OK reported. |
Enable criteria:
| Intake air temperature higher than 0°C. |
| Atmospheric pressure between 75 and 106 kPa. |
| Tank level lower than 50 litres. |
| Current tank pressure sensor value is adapted. |
Fault criteria:
| Adapted value is more than 750 Pa lower than atmospheric pressure. |
| A fuel level sensor fault has been detected at the same time, which makes the EVAP diagnosis unreliable. |
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.) |
Checking the wiring harness
Move the wiring harness at several spots and in several directions to reveal intermittent breaks and short-circuits. Check switches, connectors and crimp connections for oxidation, retracted pins and pin clamping force.
Diagnostic help
Diagnosis regards:
| Faulty fuel level sensor and tank pressure sensor. |
| Resistance in cable and connectors to tank pressure sensor and fuel level sensor. |
Functions in the diagnostic tool related to the fault:
| Pressure must be around 0 pa with ignition on. |
| (See also description of readings/activations in diagnostic tool) |
