Back-Up Voltage Circuit Malfunction
1997-2001 Subaru Impreza 2.2L H4
Description
The PCM has detected a malfunction in the back-up voltage circuit. This circuit provides battery voltage to the PCM memory to preserve adaptive learning values and stored data when the ignition is off.
Symptoms
- Check Engine Light
- Loss of PCM adaptive memory on each key-off
- Slightly rough idle after restart
- Fuel trim relearning each drive cycle
Common Causes
- Blown back-up power fuse
- Corroded battery cable or terminal
- Wiring open in back-up voltage circuit
- Faulty back-up power relay
- Battery in poor condition
Diagnostic Steps
- Check back-up voltage fuse
- Measure back-up circuit voltage at PCM connector with key off
- Inspect battery terminals for corrosion
- Test back-up power relay
- Check wiring continuity
Repair Notes
Replace the blown fuse or repair wiring in the PCM back-up voltage circuit.
Related Codes
Other Powertrain Codes
- P0001Fuel Volume Regulator Control Circuit/Open
- P0002Fuel Volume Regulator Control Circuit Range/Performance
- P0003Fuel Volume Regulator Control Circuit Low
- P0004Fuel Volume Regulator Control Circuit High
- P0010Intake Camshaft Position Actuator Circuit/Open Bank 1
- P0011Intake Camshaft Position Timing Over-Advanced Bank 1
- P0012Intake Camshaft Position Timing Over-Retarded Bank 1
- P0013Exhaust Camshaft Position Actuator Circuit/Open Bank 1
- P0014Exhaust Camshaft Position Timing Over-Advanced Bank 1
- P0015Exhaust Camshaft Position Timing Over-Retarded Bank 1
P1560 on Other Vehicles
Common Questions
What does code P1560 mean on a 1997-2001 Subaru Impreza?
P1560 stands for "Back-Up Voltage Circuit Malfunction". The PCM has detected a malfunction in the back-up voltage circuit. This circuit provides battery voltage to the PCM memory to preserve adaptive learning values and stored data when the ignition is off.
What are the symptoms of P1560 on a Subaru Impreza?
Common symptoms of P1560 include: Check Engine Light, Loss of PCM adaptive memory on each key-off, Slightly rough idle after restart, Fuel trim relearning each drive cycle.
What causes P1560 on a 1997-2001 Subaru Impreza?
Common causes of P1560 include: Blown back-up power fuse, Corroded battery cable or terminal, Wiring open in back-up voltage circuit, Faulty back-up power relay, Battery in poor condition.