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Seroj
Dodge Dakota
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4/13/2005
12:25:57

Subject: Can I bypass the ECU?
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My '91 5.2 Dakota's check engine light is on and I'm getting a code 41. The alternator checked out good and is putting out 75 amps. But I'm not getting over 12 volts at the battery with it running, and my battery is dying. Tried a new battery, didn't help.

Finally took it to a shop and they said I need a new ECU. Or they said I could bypass the ECU, but they wouldn't do the work.

My question is, how do I bypass the ECU? Can I run a wire from the alternator output terminal (BAT) to the positive battery post? Couldn't be this simple could it?

I guess I could buy a new computer, but they're pretty expensive.

Please help if you know - I'm trying not to get stranded somewhere.



Seroj
Dodge Dakota
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4/13/2005
14:58:45

RE: Can I bypass the ECU?
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C'mon - anyone out there have any ideas?



jay
Dodge Dakota
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4/13/2005
15:10:18

RE: Can I bypass the ECU?
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go to a junkyard and buy an ecu. sometimes, they are really really cheap from a junkyard. then take it and get it tested. dont try to bypass anything in the one you have. you might end up overcharging your battery. ever think of checking the voltage regulator?



Seroj
Dodge Dakota
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4/13/2005
16:35:11

RE: Can I bypass the ECU?
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Well, the voltage reg is part of the ECU. I've tried junk yards and they don't have one. A new one is $164 from Napa.

I don't want to overcharge my battery either, but I was hoping the output is regulated on the alternator feed side as opposed to the alternator output side.

I'm really groping in the dark here. I'm no electronics wizard. Just looking for any help I can find. Thanks



Kowalski
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4/13/2005
17:58:27

RE: Can I bypass the ECU?
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Go to car-part.com for lots of salvage yards online. If you don't find it under ECU try PCM. You should find a cheap one there. Otherwise you're going to have to wire up a voltage regulator.

Lead, follow, or get out of the way

Seroj
Dodge Dakota
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4/14/2005
09:45:40

RE: Can I bypass the ECU?
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Thanks for the replies. I tried a new ECU yesterday and still had the problem. My alternator's ok, so how can I wire it up to a regulator and the battery?

This thing is driving my nuts!



Mike S.
Dodge Dakota
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4/14/2005
12:29:44

RE: Can I bypass the ECU?
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I have a carbed 91 and I still have the computer in place. To bypass the ECU (just the voltage regulator) you need a older style regulator. I use the Mopar race unit. You just need to run 1 wire from the alt. to the regulator. I will check tonight and tell you the exact connection needed.

Mike S.
91CC Carbed 390 w/nitrous



Seroj
Dodge Dakota
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4/14/2005
16:29:14

RE: Can I bypass the ECU?
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Thanks Mike! I look forward to hearing how you wired it.



Rob C
Dodge Dakota
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4/15/2005
02:21:44

RE: Can I bypass the ECU?
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Seroj, Aren't you going off on a tangent here? Your Alternator is good, you tried a new ECU and it didn't help, you tried a new battery and no help. Maybe you have something as simple as a corroded battery cable under the insulation. Have you cleaned and inspected the battery cables? Either way, good luck with that.



Kowalski
GenIII
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4/15/2005
17:14:19

RE: Can I bypass the ECU?
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I agree with Rob - I a known good ECU didn't fix the problem, look for a bad connection or a broken wire.

Lead, follow, or get out of the way

sachin
Dodge Dakota
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11/28/2010
02:42:57

RE: Can I bypass the ECU?
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dear

its altogether a black day for me when my tata 275cng engine not exceeding a speed of 40kms {top speed} we have diagnosed every sensor through the diagnostic tester provided by tata motors india , no code has there on the display. as a matter of fact we have installed a new e.c.u.and the top end was increased to 120kmpl.
kindly assist me how to flash a e.c.u or how to achieve the top speed on the old e.c.u which was installed firstly.
or else any other way to solve the problem

i, remain!

regards!
sachin mahajan
indore india



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