98 ES 2.5 V6 Idle Surging Code P0122 Low TPS Voltage

[blkvet95]

PCM was only $120 including shipping on Ebay. I needed to change the other parts due to age of car anyway..... Hopefully this will fix it

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[blkvet95]

Still NG!

Put in a rebuilt alternator from Rockauto.com yesterday, also put in a new battery.

Still have P0122 low TPS voltage and still have pulsating electrical system and SES light.

When I turn on the dome lights they pulse too.

If I turn on headlights and then highbeams, and dome lights then put on rear defroster I get a battery light!

Turn everything off and battery light goes off in about 20 seconds.

I think I'll surrender to the dealer's $4,500 computer, maybe threy can fix it.

And changing the alternator was one Royal PITA!

Took me about 6 hours, and I have a lift!

I've got both service manuals and now this has gotten a little out of hand...checked for another voltage regulator, but it seeems like the PCM does that and that's been changed too.

Totally stumped on this one!

[bad venge]

Sounds like a bad regulator ... did you ever get it checked /tested ??? sounds like the regulator is bad , not in the alternator

[blkvet95]

The PCM modulates the field in the alternator which acts as a voltage regulator....that is what shows in the service manual volume 2 circuit diagram. I changed the PCM also, so there is no other component to replace. There is probably a bad ground somewhere...

[bad venge]

I'm saying "take it to autozone advanced ect " they do a free charging system check ...
Your rebuilt unit could be bad ... better then spending hours checking wiring for a part that was bad from the start

[blkvet95]

Autozone? Why would I want to take it to them?

So I checked for loose grounds....

Turns out the main grounding cable on the driver side of the engine was totally loose!

Had to tighten the 12MM socket head bolt 2 turns just to get it snug.

Restarted the car and it ran perfectly!

Shut it off, hooked up my code scanner, deleted all codes, resterted and took it for a test drive....no more codes and it purs like a tiger!

All repaired

Thanks for your help though

Everyone should learn from this that checking grounds is an essential part of diagnosing an electrical problem....I learned my lesson

[Killa200]

omg... yes that makes me want to recheck all of my grounding on my avenger.... i am pretty much following this thread because i am word for word in the exact same boat as you symptom wise... rough idle, flashing lights, occasional can trying to kill itself.

[Tiddy427]

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