SAAB WIS ONLINE

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)

  P1451 00


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:

Engine running.
Coolant temperature over 4°C.
Intake air temperature over 4°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.

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 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.

Functions in the diagnostic tool related to the fault:

Test value:
Fuel Level
Tank Pressure

(See also description of readings/activations in diagnostic tool)