SAAB WIS ONLINE

T8 / P0446 00

Read the instructions below then start the fault diagnostic procedure.

Symptom: Fault indicator lamp (for further information see WIS Fault diagnosis, general)

  P0446 00


Canister Close Valve Circuit, Malfunction

Fault symptom

Fault indicator lamp (for further information see WIS Fault diagnosis, general)

On-board diagnosis

Type of diagnosis:

Continuous. But ceases when fault criteria fulfilled and does not restart until next driving cycle.

Enable criteria:

Battery voltage must be between 11 - 16 V.
Engine running.
Intake air temperature is higher than +4°C.
Tank pressure lower than -0.8kPa.
Tank purge diagnostics inactive.
NONE of the following DTCs must be detected:
P0444, P0445
P0451, P0452, P0453
P0498, P0499
P0686, P0687

When these conditions are met, the valve opens. Afterwards, diagnostics checks if the tank pressure has risen to the desired level within a calibrated time period.

Fault criteria:

The tank pressure has not increased 0.4 kPa within 8 seconds after the valve has opened.

Dependent:

None

System reaction to a fault:

Fuel adaption is blocked and reset.
Purge blocked.

OK report:

Tank pressure has increased more than 0.4 kPa within 8 seconds after the valve has opened.

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:

Blockage of fresh air intake via shut-off valve to evaporative emission canister or from the evaporative emission canister to the tank.

Functions in the diagnostic tool related to the fault:

Activation:
Canister Close Valve

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