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Voltage meter - Transmission slip NEED HELP


 
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tomynoks
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Joined: 11 Apr 2006
Location: Mesa, AZ

PostPosted: Wed Oct 24, 2007 2:15 pm    Post subject: Voltage meter - Transmission slip NEED HELP Reply with quote

'99 XJ- first symptom was that the voltage meter maxes out after running a few minutes... then the transmission slips.. won't move in D--- will move in lower gears. PCM threw code of P0715 Speed sensor-- replaced that.. same symptoms.. I assume it threw that code becasue the tranny is slipping....put in another PCM..(voltage reg is on PCM) no change. The transmission only slips when the voltage maxes out. It seems fine when it's at 14v. Also tested volage at battery w/ engine running.. it is at 19-20v.

Need some help badly...

Thanks,

Tom
_________________
'99 XJ Sport
AirAid Intake
PowerAid Throttle body spacer
RE6030 3.5"
1" T-case drop
31x10.5x15 BFG AT KO's
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Teriod
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Joined: 19 Jun 2007
Location: California

PostPosted: Wed Oct 24, 2007 3:00 pm    Post subject: Reply with quote

i dont believe you're supposed to be putting out that much voltage,,,, you might have a bad altenator

you should only be at 14 volts
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tomynoks
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Joined: 11 Apr 2006
Location: Mesa, AZ

PostPosted: Wed Oct 24, 2007 11:08 pm    Post subject: Reply with quote

I replaced the alternator, no change. I also have a new battery. The voltage regulator is in the PCM, not the alternator, but there must be something else that affects voltage since I have replaced the PCM as well.

Thanks,
_________________
'99 XJ Sport
AirAid Intake
PowerAid Throttle body spacer
RE6030 3.5"
1" T-case drop
31x10.5x15 BFG AT KO's
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tomynoks
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Joined: 11 Apr 2006
Location: Mesa, AZ

PostPosted: Thu Oct 25, 2007 1:27 pm    Post subject: Reply with quote

Also checked battery ground... Volt meter reads ZERO between neg term and block. Took off ground cable and brushed contacts to be sure.

Someone must know know something..... :o))





Thanks,



Tom
_________________
'99 XJ Sport
AirAid Intake
PowerAid Throttle body spacer
RE6030 3.5"
1" T-case drop
31x10.5x15 BFG AT KO's
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Teriod
Member


Joined: 19 Jun 2007
Location: California

PostPosted: Thu Oct 25, 2007 2:40 pm    Post subject: Reply with quote

are you getting 19-20 volts at your dash gauge???

as for trans slip heres a link that might help
http://www.autozone.com/servlet/UiBroker

all these things can cause a trans to slip,,if it were me, the first thing i would do is service the tranny with new fluid and filter and go from there

yes it could be as simple as that

I hope this helps
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tomynoks
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Joined: 11 Apr 2006
Location: Mesa, AZ

PostPosted: Thu Oct 25, 2007 3:31 pm    Post subject: Reply with quote

dash gauge is maxed after a running for a few minutes. Tests at 10-22v at battery.

Thanks,
_________________
'99 XJ Sport
AirAid Intake
PowerAid Throttle body spacer
RE6030 3.5"
1" T-case drop
31x10.5x15 BFG AT KO's
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Brad The Best
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Joined: 14 Jan 2007
Location: Kamloops B.C Canada

PostPosted: Thu Oct 25, 2007 8:55 pm    Post subject: Reply with quote

if you take a multimeter and check the voltage what is it ? don't trust the gage .

what year is your jeep ? is it externally voltage regulated? basically was it a delco alt or a nippondenso ?
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Brad The Best
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Joined: 14 Jan 2007
Location: Kamloops B.C Canada

PostPosted: Thu Oct 25, 2007 9:07 pm    Post subject: Reply with quote

tomynoks wrote:
Also checked battery ground... Volt meter reads ZERO between neg term and block. Took off ground cable and brushed contacts to be sure.



Tom


it should reed 0 between the neg terminal and the block using a volt meter .

another thing you can try is to replace your ground wire's and positive to your starter , they get messed up and your voltage goes all weird . i think its your regulator though , a new alt could be messed up as well
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Brad The Best
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Joined: 14 Jan 2007
Location: Kamloops B.C Canada

PostPosted: Thu Oct 25, 2007 9:10 pm    Post subject: Reply with quote

oh i see its a 99 so im guessing delco which is internally regulated
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tomynoks
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Joined: 11 Apr 2006
Location: Mesa, AZ

PostPosted: Fri Oct 26, 2007 11:17 pm    Post subject: Reply with quote

Ok..... It was the ground strap off the rear of the block to the firewall. I decided to clean anything that was grounded inside the engine compartment, one at a time and check to see if there is any change. The last one I checked was the rear ground strap and that was it. Simple huh? Didn't cost a dime. I also know that at least as of right now, my alternator, PCM and speed sensor are all working fine. Thanks for the help, I hope this will help someone down the road.

Tom Smith
_________________
'99 XJ Sport
AirAid Intake
PowerAid Throttle body spacer
RE6030 3.5"
1" T-case drop
31x10.5x15 BFG AT KO's
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