SAAB WIS ONLINE

DTC P0519 IDLE CONTROL SYSTEM MALFUNCTION (FAIL-SAFE)

DTC P0519 IDLE CONTROL SYSTEM MALFUNCTION (FAIL-SAFE)

OUTLINE OF DIAGNOSIS

Detect the malfunction that engine speed increases more than that in normal condition during idling.

ENABLE CONDITION

Secondary Parameters Enable Conditions
Battery voltage

≥ 10.9 V

Feedback in ISC

In operation

Vehicle speed

< 4 km/h (2.49 MPH)

After engine starting

1 seconds or more



GENERAL DRIVING CYCLE

Always perform diagnosis at less than 4 km/h (2.49 MPH) of vehicle speed.

DIAGNOSTIC METHOD

Judge NG when the continuous time until completing the all malfunction criteria below becomes more than the time needed for diagnosis (2 seconds).

Judgment Value

Malfunction Criteria Threshold Value
Engine speed − target eng. speed

> 2000 rpm

Feedback value for ISC

≤ 0

Engine speed change every 180 degree engine rev.

≥ −5 rpm



Time Needed for Diagnosis: 2 seconds

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

Normality Judgment

Judge OK and clear NG when the continuous time until completing the malfunction criteria below becomes more than the time needed for diagnosis (5 seconds).

Judgment Value

Malfunction Criteria Threshold Value
Engine speed − target eng. speed

< 200 rpm



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

Fuel shut-off: Shut-off fuel for only #1 and #2 cylinder, or for all cylinder in accordance with vehicle speed, engine speed, throttle position

ECM OPERATION AT DTC SETTING

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