Chrysler Corp. Light trucks use a Denso generator. The generator consists of a rotor, stator, rectifiers, front and rear covers and drive pulley. Voltage regulation is controlled by the Powertrain Control Module (PCM) on all models except diesel. I am assuming your truck is not a diesel. The PCM monitors critical input to control fuel injection, ignition, emission and other engine management functions. The PCM is also programmed to monitor charging system related circuits: Battery feed to PCM. Generator field control. Battery charging voltage (high & low). If a problem is sensed in a monitored circuit, a Diagnostic Trouble Code (DTC) will be stored in PCM memory and Malfunction Indicator Light (MIL) will come on, provided specific criteria have been met. DTCs can be read using MIL, Chrysler's Diagnostic Readout Box (DRB-III), or a generic scan tool. If you don't have a scan tool, go to your local parts store and have them download codes if there is any.
INITIAL CHECKS Before proceeding with charging system diagnosis, ensure following conditions are met: Battery is fully charged and in good condition. Battery cables are in good condition with connections clean and secure. Generator belt is in good condition and properly tightened. Generator and PCM wiring harness connections are clean and tight. Engine ground strap is in place.
UNSTEADY OR LOW CHARGING Check for loose generator belt, charging resistance too high, loose generator ground wire, corroded battery terminals or faulty generator.
SELF-DIAGNOSTIC SYSTEM If a problem is sensed in a monitored circuit, a Diagnostic Trouble Code (DTC) will be stored in PCM and MIL will come on, provided specific criteria are met. PCM will then enter limp-in mode, substituting information from other sources to compensate for component failure. Vehicle is operational in limp-in mode, but driveability may not be optimal. A specific DTC results from a particular system failure. DTC only indicates problem circuit. It does not identify specific component failure in the circuit. If problem is repaired or ceases to exist, PCM automatically clears DTC after 50 ignition on-off cycles. DTCs can also be cleared using scan tool.
I will most likely need the codes before I can assist you, I want to check the wiring looms in the engine compartment and around the transmission make sure the wires are in good condition. And that the transmission guys did not damage the loom or pinch any wires between the engine and the transmission
Thursday, February 18th, 2010 AT 10:08 PM