DESCRIPTION
All models use a Nippondenso generator. Generator consists of a rotor, stator, rectifiers, front and rear covers and drive pulley. On 3.3 and 3.8L engines, generator uses a decoupler pulley. Decoupler pulley is a one-way clutch type pulley, which is designed to help reduce belt tension fluctuation, fatigue loads, noise and has a low sensitivity to electrical load. It is a non-servicable, non-lubricated pulley. If found faulty decoupler pulley must be replaced as an assembly. On all engines, generator is serviced as a complete unit only. Voltage regulation is controlled by Powertrain Control Module (PCM). Electronic Voltage Regulator (EVR) is not a separate component, but a circuit located within PCM. If EVR circuit is defective, PCM must be replaced.
OPERATION
Amperage produced by generator is controlled by Electronic Voltage Regulator (EVR) circuitry within Powertrain Control Module (PCM). EVR circuity is connected in series with generator field driver terminal and ground. A Battery Temperature Sensor (BTS), located on PCM printed circuit board, is used to sense battery temperature. BTS cannot be serviced separately. If BTS is found faulty, PCM must be replaced. Sensed battery temperature and data from monitored line voltage is used by PCM to adjust battery charging rate. This is accomplished by cycling ground path to control strength of generator rotor magnetic field. PCM compensates and regulates generator amperage output accordingly. PCM monitors critical input to control fuel injection, ignition, emission and other engine management functions. PCM is also programmed to monitor the following charging system-related circuits.
- Battery feed to PCM.
- Generator field control.
- Battery charging voltage (high and low).
Note. DTC is erased from memory if failure does not reoccur after 50 engine starts.
If a problem is sensed in a monitored circuit, a Diagnostic Trouble Code (DTC) will be stored in PCM memory. Malfunction Indicator Light (MIL) will illuminate, provided specific criteria have been met. DTCs can be retrieved by using Chrysler's Diagnostic Readout Box (DRB-III).