Subaru 2009 IMPREZA Service Manual page 899

Diagnostic Trouble Code (DTC) Detecting Criteria
CX:DTC P1560 BACK-UP VOLTAGE CIRCUIT MALFUNCTION
1. OUTLINE OF DIAGNOSIS
Detect the open/short circuit of back-up power supply circuit.
Judge as NG when the backup power voltage is low.
2. ENABLE CONDITIONS
Secondary Parameters
None
3. GENERAL DRIVING CYCLE
Always perform the diagnosis continuously.
4. DIAGNOSTIC METHOD
• Abnormality Judgement
If the duration of time while the following conditions are met is longer than the time indicated, judge as NG.
Judgement Value
Malfunction Criteria
Voltage of back-up power supply
Battery voltage
Engine condition
Time Needed for Diagnosis: 2500 ms
Malfunction Indicator Light Illumination: Illuminates as soon as a malfunction occurs.
• Normality Judgement
Judge as OK and clear the NG if the continuous time while the following conditions are established is more
than the predetermined time.
Judgement Value
Malfunction Criteria
Voltage of back-up power supply
Battery voltage
Engine condition
Time Needed for Diagnosis: Less than 1 second
Enable Condition
Threshold Value
Low
10.9 V
After engine starting
Threshold Value
High
10.9 V
After engine starting
GD(H4SO)-175
GENERAL DESCRIPTION