SAAB WIS ONLINE

DTC P0448 EVAPORATIVE EMISSION CONTROL SYSTEM VENT CONTROL CIRCUIT SHORTED

DTC P0448 EVAPORATIVE EMISSION CONTROL SYSTEM VENT CONTROL CIRCUIT SHORTED

OUTLINE OF DIAGNOSIS

Detect the open or short circuit of drain valve.

Judge NG when the ECM output level is different from the actual terminal level.

COMPONENT DESCRIPTION


(1)

Bobbin

(8)

Magnetic plate

(15)

Diaphragm

(2)

Coil

(9)

Shaft

(16)

Movable core

(3)

Diode

(10)

Plate

(17)

Spring

(4)

Stator core

(11)

Valve

(18)

Cover

(5)

End plate

(12)

Housing

(19)

O-ring

(6)

Body

(13)

Filter

(7)

Yoke

(14)

Retainer



ENABLE CONDITION

Secondary Parameters Enable Conditions
None



GENERAL DRIVING CYCLE

Always perform the diagnosis continuously.

DIAGNOSTIC METHOD

Abnormality Judgment

Judge NG when the continuous time of completing the malfunction criteria below becomes more than 2.5 seconds.

Judgment Value

Malfunction Criteria Threshold Value
Ignition switch

ON

Battery voltage

≥ 10.9 V

After engine starting

1 second or more

Terminal output voltage when ECM sends ON signal

High



Time Needed for Diagnosis: 2.5 seconds

Malfunction Indicator Light Illumination: Illuminates as soon as the malfunction occurs.

Normality Judgment

Judge OK and clear the NG when the malfunction criteria below are completed.

Judgment Value

Malfunction Criteria Threshold Value
Ignition switch

ON

Battery voltage

≥ 10.9 V

After engine starting

1 second or more

Terminal output voltage when ECM sends ON signal

Low



DTC CLEAR CONDITION


• When the OK idling cycle was completed 40 times in a row

• When “Clear Memory” was performed


MALFUNCTION INDICATOR LIGHT CLEAR CONDITION


• When the OK driving cycle was completed 3 times in a row

• When “Clear Memory” was performed


FAIL SAFE

PCV control: Open the PCV solenoid.

ECM OPERATION AT DTC SETTING

Memorize the freeze frame data. (For test mode $02)