Symptom Chart

WARNING: This page is about a different car, the 2007 Mercury Mariner and 2007 Ford Escape. 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	Battery Generator High key-off current drain(s) Engine, generator and battery grounds Positive battery cable	Go to Pinpoint Test A . For Escape Hybrid, REFER to HIGH VOLTAGE CONVERTER/INVERTER article to diagnose the DC/DC converter.
The charging system warning indicator is on with the engine running (the charging system voltage does not increase)	Circuitry Generator PCM	Go to Pinpoint Test B .
The charging system overcharges (battery voltage is greater than 15.5 volts)	Circuitry Generator PCM	Go to Pinpoint Test C .
The charging system warning indicator is on with the engine running and the battery increases voltage	Generator Instrument cluster (IC) PCM	Go to Pinpoint Test D .
The charging system warning indicator is off with the ignition switch in the RUN position and the engine off	IC PCM	Go to Pinpoint Test E .
The charging system warning indicator flickers or is intermittent	IC	INSTALL a new IC. REFER to INSTRUMENT CLUSTER article.
The generator is noisy	Loose bolts/brackets Accessory drive belt Generator/pulley	Go to Pinpoint Test F .
Radio interference	Generator In-vehicle entertainment system	Go to Pinpoint Test G .