Symptom Chart

WARNING: This page is about a different car, the 2007 Lincoln MKX and 2007 Ford Edge. However, it is still accessible from the selected car via links, so may be relevant.

Symptom Chart

Condition	Possible Sources	Action
The battery is discharged or battery voltage is low	High key-off current drain(s) Engine, generator and battery grounds Positive battery cable Circuitry Battery Generator	Go to Pinpoint Test A .
DTC P0563 - Charging system voltage was higher than 15.9 volts	Bad battery ground High resistance A sense circuit Generator Battery PCM	Go to Pinpoint Test B .
DTC P0620 - Generator control circuit malfunction	Regulator connector not fully inserted Open 2-way harness connector Open GEN COM circuit Shorted GEN COM circuit to ground Shorted GEN COM circuit to B+ Open A sense circuit or fuse Bad PCM ground Generator PCM	Go to Pinpoint Test B .
DTC P0625 - GENMON input to PCM was stuck low	Shorted GENMON circuit to ground Loose connection to B+ circuit Open A sense circuit or fuse Generator PCM Broken front end accessory drive (FEAD) belt	Go to Pinpoint Test B .
DTC P0626 - GENMON input to PCM was stuck high	Open GENMON circuit Shorted GENMON circuit to B+ circuit Open B+ circuit Bad engine ground Generator PCM	Go to Pinpoint Test B .
DTC P065B - GENMON input frequency was continuously less than 80 Hz or continuously more than 200 Hz	Wiring short to GENMON circuit Generator PCM	Go to Pinpoint Test B .
The charging system warning indicator is on with the engine running and no charging system DTCs present	Circuitry PCM Generator Instrument cluster	Go to Pinpoint Test C .
The generator is noisy	Accessory drive belt Loose bolts/brackets Generator/pulley	Go to Pinpoint Test D .
Radio interference	Generator Circuitry In-vehicle entertainment system	Go to Pinpoint Test E .