XJR (X308) V8-4.0L SC (AJ26) (1998)
Engine Control Module: Description and Operation
Voltage Monitoring Procedure
The ECM monitors battery and ignition supply voltages.
DTC P0560 will be logged should the ECM detect a continuous difference between battery and ignition voltage input. If a difference is detected, a
counter is started; should the counter exceed a predetermined value a failure judgement will be made.