SAAB WIS ONLINE

DTC P0103 MASS OR VOLUME AIR FLOW CIRCUIT HIGH INPUT

DTC P0103 MASS OR VOLUME AIR FLOW CIRCUIT HIGH INPUT

OUTLINE OF DIAGNOSIS

Detect the open or short circuit of air flow sensor. Judge NG when out of the standard value.

COMPONENT DESCRIPTION


(1)

Air flow sensor

(3)

Voltage (V)

(A)

Air

(2)

Intake air temperature sensor

(4)

Intake air volume (kg/s)



ENABLE CONDITION

Secondary Parameters Enable Conditions
None



GENERAL DRIVING CYCLE

Always perform the diagnosis continuously.

DIAGNOSTIC METHOD

Judge NG when the continuous time until completing the malfunction criteria below becomes more than 0.5 seconds. Judge OK and clear the NG when the malfunction criteria below are not completed.

Judgment Value

Malfunction Criteria Threshold Value
Output voltage

≥ 4.985 V



Time Needed for Diagnosis: 0.5 seconds

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

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


Air flow meter: Engine load is normally calculated by manifold pressure and engine speed; however, calculated only by manifold pressure.

EVAP conc. learning (fuel): Not allowed to learn.

Knock compensation:

- At normal: learned ignition timing value = knock F/B timing value + whole learning timing value + partial learning timing value

- At trouble: learned ignition timing value = −3°CA (retard 3°CA)

Knock F/B timing value = 0°CA

Whole learning is not allowed.

Partial learning is not allowed.

ISC control: Make the open loop compensation to be the given value (1 g (0.04 oz)/s). Stop calculating the throttle sensor temperature compensation. (Hold the previous value.)


ECM OPERATING AT DTC SETTING

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