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92dakotabasta
Dodge Dakota
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5/06/2009
18:42:03
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 Subject: 92 V6 PCM PROBS
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Message:
I have a 92 dakota 4x4 with a 3.9 V6 and a MANUAL
transmission.
The original V6 finally crapped out and I replaced it with a
junkyard 1996 V6 a month ago. The 96 motor did not have any
EGR system on it.....so I swapped the intake and exhaust
manifolds from the 92 to the 96 engine....the engine ran fine for
the month until PCM(ECU) failure....this is where it gets
messy.....
The PCM has a base number of 56028749, my local dodge
dealership has this PCM listed, but not for my truck, in fact, they
seemed very confused, as I am now.
I opened up my PCM and noticed stampings as to when it was
manufactured....it said 1996.
So my PCM was replaced at some point before I purchased the
truck.....???
What PCM do I use??????????
56028741
56028750
or should I still stay with PCM I got with truck??
HELP!!!!!!!!!!!!!!!!!!!!!
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?
Dodge Dakota
JOIN HERE
5/07/2009
08:09:14
| RE: 92 V6 PCM PROBS
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Message:
One = define 'failure' , what is happening ?
Two - have you checked that infamous splice
under the fuse/relay box ?
Three - If it really does need another ECM
try www.car-parts.com - get a used one for a V6
92 up to 95 , never mind the numbers..
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92dakotabasta
Dodge Dakota
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5/07/2009
19:40:00
| RE: 92 V6 PCM PROBS
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Message:
does this post???
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92dakotabasta
Dodge Dakota
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5/07/2009
20:21:20
| RE: 92 V6 PCM PROBS
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Message:
Last weekend as I driving back from the country, the motor just
cut out....i could not restart on the highway. it was towed home.
once in my driveway, i checked for spark at cyl 1 and the motor
started...and the motor started!!
the motor ran but poorly....and then after a few minutes it would
stall. the motor would start again and stall out. after restarting it
a few times, i would be bring the rpms to 1500 and hold it there
for a few minutes, and it ran ok.....as soon as the revs came
down it would stall again. the following day, it just didnt start
and hasnt all week.
i have tested the primary and secondary resistance of the ign
coil, and its in range. my cap rotor and wires are only 2 months
old. I have continuity from the asd relay to the coil and still no
spark...i have heard about the infamous splices....so i did rip up
all the wires under my relay box....i did see a few splices, i
checked for continuity between the splices, and i had continuity,
maybe i missed one????
after speaking with a mechanic, he recommended that i replace
the ecu......
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92 dakotabast
Dodge Dakota
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5/09/2009
19:19:36
| RE: 92 V6 PCM PROBS
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Message:
the bugger started after 3 days of tryn...???
runs fine with no check engine light on.....how long will this last??
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J and J Auto
GenII
5/12/2009
03:22:24
| RE: 92 V6 PCM PROBS
IP: Logged
Message:
here is how to check that
pin #'s 3 and 9 one has power all the time for
comp memory and one goes on off with key next
time it acts up just use a long sewing needle
and back probe these 2 pin's
Any 3.9 92 to 95 will run any 3.9 92 to 95 manual
or auto trans
Here is something to think about find a full size
ram 3.9 these computers offer better o/d and
lockup operation of the trans have more timing
and fuel added to offset the weight of the heavier
trucks
A very noticeable diff using these comps on the
smaller dakotas
Larry
J&J Auto
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92dakotabasta
Dodge Dakota
JOIN HERE
5/13/2009
03:23:32
| RE: 92 V6 PCM PROBS
IP: Logged
Message:
Thanks Larry....
i havent driven the truck this week...but i do started her up and
let her run for about 30 minutes everyday....yesterday the check
engine came on.....
kind of a sputter from the motor when accelerator is depressed
slowly, a few revs and the sputter kinda isnt there....
i did the key on off...and this is what i got..when the battery was
connected...
35 fan control relay curcuit (clutch fan??)
9...?????
27 Fault in injector driver interface circuit .
55 code display completion
i have a junkyard ecm coming in on Friday...and if this doesnt
work.....IM GONNA TAKE A FIT!!!!
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92dakotabasta
Dodge Dakota
JOIN HERE
5/13/2009
03:25:34
| RE: 92 V6 PCM PROBS
IP: Logged
Message:
Thanks Larry....
i havent driven the truck this week...but i do started her up and
let her run for about 30 minutes everyday....yesterday the check
engine came on.....
kind of a sputter from the motor when accelerator is depressed
slowly, a few revs and the sputter kinda isnt there....
i did the key on off...and this is what i got..when the battery was
connected...
35 fan control relay curcuit (clutch fan??)
9...?????
27 Fault in injector driver interface circuit .
55 code display completion
i have a junkyard ecm coming in on Friday...and if this doesnt
work.....IM GONNA TAKE A FIT!!!!
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Bob Lincoln
Dodge Dakota
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5/13/2009
08:33:10
| RE: 92 V6 PCM PROBS
IP: Logged
Message:
I'll bet you still have a bad splice, and nothing is wrong with the ECM. Monitor the 12V power to the ECM as Larry suggested.
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92dakotabasta
Dodge Dakota
JOIN HERE
5/15/2009
17:11:24
| RE: 92 V6 PCM PROBS
IP: Logged
Message:
ok....tested the 3 and 9 pins....voltage is there....jiggled the
wires around...everything seems to be in order....i did re-solder
some splices up where the relay box is....replaced the FI
connectors and now my ecm reads 12 and 55....yuppie!
gonna have to take her on good cruz this weekend to be sure....
hopefully, my next post will be when i swap to a 318....*s*
thanks guys!!
"real men drive mopar!"
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