T8 / P1451 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 Pressure Sensor Performance Problem
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:
| Coolant temperature over 4°C. |
| Intake air temperature over 4°C. |
| NONE of the following DTCs must be detected: |
Fault criteria:
| Tank pressure alternates more quickly than that which can be caused by sloshing of the petrol. More than 15 pressure changes of more than 25 Pa for 5 s. |
| A fuel level sensor fault has been detected at the same time, which makes the EVAP diagnosis unreliable. |
Dependent:
System reaction to a fault:
| The control module uses a substitute value of 0 kPa. |
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. |
| Fault in connector H42-2 is often a cause of this DTC. |
Functions in the diagnostic tool related to the fault:
| (See also description of readings/activations in diagnostic tool) |
