T8 / P0451 00
Read the instructions below then
start the fault diagnostic procedure.
Symptom: Fault indicator lamp (for further information see WIS Fault diagnosis, general)
Tank pressure sensor malfunction.
Fault symptom
Fault indicator lamp (for further information see WIS Fault diagnosis, general)
On-board diagnosis
Type of diagnosis:
Enable criteria:
| Battery voltage must be between 11 - 16 V. |
| 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. |
Dependent:
System reaction to a fault:
| The control module uses a substitute value of 0 kPa. |
OK report:
| Fault criteria NOT fulfilled for 6 s. |
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:
| Electrical fault in connecting leads or component. |
| 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) |
