Chart #3 Message Diagnosis

Chart #3 Message Diagnosis (Battery No Charge Battery Volts High/Low Or Service Engine Soon Message):

The voltage regulator grounds the generator L terminal when it detects a fault. When the IPC (4.9L) or PCM (4.6L) detects the ground, the generator BATTERY NO CHARGE message is commanded ON. The message appears when one of the following conditions is detected.
^ Open rotor or field control circuit.
^ Output voltage too high or low.
^ Shorted positive or negative bridge diode at the regulator phase terminal.
^ Open internal phase connection at the regulator phase terminal.
The BATTERY VOLTS LOW, BATTERY VOLTS HIGH and SERVICE ENGINE SOON messages are turned on when abnormal system voltages are detected by the PCM or IPC. Refer to Diagnostic Codes. Testing and Inspection