P1451

P1451 00

EVAP System. Fuel Level Sensor Failure and Pressure Sensor Performance Problem







Fault symptom
Check Engine

On-board diagnosis

Type of diagnosis:
Once per driving cycle. Stopped when fault criteria are fulfilled or OK reported.

Enable criteria:
Engine running.
Coolant temperature over 4 degree C.
Intake air temperature over 4 degree C.
NONE of the following DTCs must be detected:
- P0444, P0445
- P0452, P0453
- P0498, P0499

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
None

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:
Type III
(See Description of On-Board Diagnostics/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
Fault in connector H42-2 is often a cause of this DTC.