SAAB WIS ONLINE

DTC P1560 BACK-UP VOLTAGE CIRCUIT MALFUNCTION

DTC P1560 BACK-UP VOLTAGE CIRCUIT MALFUNCTION

OUTLINE OF DIAGNOSIS

Detect open or short circuit of the back-up voltage circuit.

Judge NG when the back-up voltage becomes smaller than the battery voltage.

ENABLE CONDITION

Secondary Parameter Enable Condition
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
Voltage of back-up power

Low

Battery voltage

≥ 10.9 V

Engine speed

≥ 500 rpm



Time Needed for Diagnosis: 2.5 seconds

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

Normality Judgment

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

Judgment Value

Malfunction Criteria Threshold Value
Voltage of back-up power supply

High

Battery voltage

≥ 10.9 V

Engine speed

≥ 500 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

None

ECM OPERATION AT DTC SETTING

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