ECM not communicating with alternator's voltage regulator.

30

Asked by Mar 14, 2016 at 01:54 PM about the 1998 Dodge Grand Caravan

Question type: Maintenance & Repair

Battery is not charging.  Was told regulater bad.  Replaced alternator have same
problem. Suspected bad wire to ECM or ECM.

8 Answers

30

The ECM in some manner controls the voltage regulator, which charges the battery.

3 of 3 people found this helpful.
79,105

The voltage regulator works all on its own. The computer does not control it in any way.

40

rowefast is a MORON the voltage regulator driver is a chip built into the dodge PCM and can only be fixed by 3 methods 1 replace pcm 2 bypass internal pcm voltage regulator with an external one however this will have a check engine light on and a code and the battery guage will read zero 3 remove PCM and take it apart and replace or re solder the voltage regulator driver chip if issue is intermittent then re solder

4 of 4 people found this helpful.
79,105

Excuse Me Ass-Hole? Everybody has a bad day.

1 of 1 people found this helpful.
79,105

Yes the charging system goes through the pcm ,The Electronic Voltage Regulator (EVR) is not a separate component. It is actually a voltage regulating circuit located within the Powertrain Control Module (PCM) . The EVR is not serviced separately If replacement is necessary the PCM must be replaced.check the wiring fron the alternator for a bad fusible link ,also check the wire from the alt to the pcm(brown/grey wire) ,here are some diagram for that system . The pcm would have to be flashed if someone has the equiptment then it can be flashed at somewhere else than a dealer but if you dont know anyone that has the tools to do this (good scanner -snap-on etc)with the reflash capability then it has to be done at the dealer...

4 of 4 people found this helpful.
79,105

Charging Diagram...

6 of 6 people found this helpful.
79,105

Plugin and pin location...

2 of 2 people found this helpful.
79,105

And the Chart...

5 of 5 people found this helpful.

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