RE: 94 XJ6 TRANSMISSION PROBLEM

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RE: 94 XJ6 TRANSMISSION PROBLEM

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RE: 94 XJ6 TRANSMISSION PROBLEM - 9/11/2007 7:36:52 AM

estunum

Posts: 46
Joined: 7/16/2007
Status: offline

What is this limp mode I hear so much about? What exactly is it and why does it happen? I describe my problem in the "Overheating?" thread I posted. My local techinitian checked it for any overheating problems and everything was fine. He said the fan clutch was a little slow and replaced it. So I'm now pretty sure its a tranny problem but didn't have the time to leave it there so he can check it out. I don't remember exactly what he said, but he did mention this limp mode. I did notice that this only happens in Indio (I work in Oceanside and drive to Indio every weekend to visit) where the temperature is much hotter.

_____________________________

1989 XJ6 Vanden Plas

(in reply to ken@britishparts.com)

Post #: 11

RE: 94 XJ6 TRANSMISSION PROBLEM - 9/11/2007 10:03:12 AM

ken@britishparts.com

Posts: 1432
Joined: 5/11/2007
Status: offline

I will have to check into the 1989 model. You don't have the rotary switch on the side of the transmission. During 88 & 89 Jaguar used a linear switch in the j-gate housing of the shifter. Let me do some home work on this one.

_____________________________

Ken Karr
Motorcars, Ltd. 800 338 5238 x626
www.motorcarsltd.com

(in reply to estunum)

Post #: 12

RE: 94 XJ6 TRANSMISSION PROBLEM - 9/22/2007 11:30:02 AM

RUSS

Posts: 6
Joined: 9/5/2007
Status: offline

TRIED IT OVER THE WEEKEND,EVERYTHING IS STILL THE SAME. THANKS FOR THE TRY.

(in reply to ken@britishparts.com)

Post #: 13

RE: 94 XJ6 TRANSMISSION PROBLEM - 12/17/2007 2:29:53 PM

RUSS

Posts: 6
Joined: 9/5/2007
Status: offline

I'm finally getting to look at this problem again. You thought it may be a solenoid problem? I'm 3 hrs away from a Jag Dealer, at this time don't have a manual & a novice at best with autos. Which solenoid(s) would you be suggesting to check out? Thanks Russ

(in reply to cadillac)

Post #: 14

RE: 94 XJ6 TRANSMISSION PROBLEM - 3/28/2008 10:59:41 AM

Frankie

Posts: 17
Joined: 3/26/2008
Status: offline

Hey Russ...did you ever solve the limp mode problem? I'm chasing one on my '90 xj6 as we speak??? Replaced the TCU and cleaned the harness going into the trans. I'm going to try the rotary switch twist tomorrow.
Thanks Frank

(in reply to RUSS)

Post #: 15

RE: 94 XJ6 TRANSMISSION PROBLEM - 4/5/2008 4:32:37 PM

XjJagXjJeepDriver

Posts: 251
Joined: 1/9/2007
Status: offline

Is this limp mode/tranny problem more problematic for the 94 XJ40 or was it a common thing on all of them?? I only ask because I have a pretty serious buyer who wants my 93 XJ6 and the 94's are starting to grow on me although I still dont dig the "no glovebox" idea or the new seat style. Either way Ill have much better luck with a 94 as far as finding one with all the options (Heated seats especially) for me since its real hard to find the 93's with that option but I've seen them b4. I still like the closer line seat design in my 93 but if this tranny thing was more potential on the 94's I'll prolly rule that out!

_____________________________

One of a kind ''93 XJ6

"My year round 325ix is more rare than my summer Jag...something wrong with that picture...

R.I.P.
''85 380SE Benz
''00 XJR
(3) Jeep XJ Cherokees
''90 Caddy Deville

(in reply to Frankie)

Post #: 16

RE: 94 XJ6 TRANSMISSION PROBLEM - 4/5/2008 10:14:05 PM

JagtechOhio

Posts: 414
Joined: 3/12/2008
Status: offline

The most common reason for the transmission control module to default to "limp home" mode and illuminate the gearbox failure warning is a faulty throttle position sensor.

The throttle position sensor is located on the underside of the throttle body, and its' sliding cotact is rotated by throttle shaft and butterfly opening. That's how the electronically controlled transmission konws when to downshift (unless the full throttle kickdown switch is depresses). That transmission has no mechanical kickdown cable or vacuum modulator.

Normally, failure of the throttle position sensor will cause the 'check engine " light to come on. If it has already been illuminated for a while (uncorrected code 39 is a common example), then you will have to read each code and clear it to read the next one. The TPS may cause limp home without the check engine light, I'm not sure about that but I doubt it.

About the only other problem with these transmissions not shifting corrctly is when water gets inside the Transmission control unit (TCU). It is located behind the right side underdash panel. There are points of water ingress on the 1993 and 1994 cars that cause all sorts of problems, and this is one of them. There is an old factory bulletin that describes the installation of a water shield for the TCU to help with this problem. It doesn't happen often, but was common enough to inspire a factory band aid.

The only real knock against '93-'94 XJ6 is engine oil burning on start-up from oil leaking past the valve stem seals. Those cars, and their successors which used the same transmission and similar engine, are nearly indestructable. All of the problems are minor, only the expense and scarcity of some of the components is sometimes a nuisance.

(in reply to XjJagXjJeepDriver)

Post #: 17

RE: 94 XJ6 TRANSMISSION PROBLEM - 4/6/2008 5:15:47 PM

XjJagXjJeepDriver

Posts: 251
Joined: 1/9/2007
Status: offline

Thank you so much! That was extremely helpful info! And you know what's funny? About 3 years ago my check engine light came on and it was the THROTTLE POSITIONING SENSOR. haha can ya believe that one. It was early on in my ownership so I fixed it right away. It's the ONLY part I've ever had to order from my local Jag dealer because I couldnt find that sensor anywhere online!! Glad to know I fixed that problem long ago and now know a little background on that problem. I'll keep in mind that TCU unit and the water issue as well. Thanks so much again!

_____________________________

One of a kind ''93 XJ6

"My year round 325ix is more rare than my summer Jag...something wrong with that picture...

R.I.P.
''85 380SE Benz
''00 XJR
(3) Jeep XJ Cherokees
''90 Caddy Deville

(in reply to JagtechOhio)

Post #: 18

RE: 94 XJ6 TRANSMISSION PROBLEM - 4/6/2008 7:18:19 PM

JagtechOhio

Posts: 414
Joined: 3/12/2008
Status: offline

Hey Jeepster,

No problem, although I wouldn't be too concerned about the TCU, it's not really that common for it to get a shower.

One point along this thread to consider, there are the occasional items for XJ40 that might be a problem to get in the future. The TPS was hard to get for a while, I haven't tried lately. Once I had to buy an earlier style and change the plug 'cause I couldn't get the '94 item. The fuseboxes are discontinued, and those frequently corrode from getting wet due to the same water leaks. And I think the DBC10009 combined relay is no longer supplied, that's the one that fails and kills your parking lights.

Whether TaTa spins Jaguar off to a new owner or keeps it, the parts supply for older models is likely to be low on their priority list of customer satisfaction concerns. We might end up doing a little more hunting for used parts in the future. It's not a big enough issue to change my mind about the reliability of these cars, there just isn't that much that can kill them other than the rust. It's just an issue to keep in mind, in my opinion.

(in reply to XjJagXjJeepDriver)

Post #: 19

RE: 94 XJ6 TRANSMISSION PROBLEM - 4/8/2008 10:56:38 AM

ken@britishparts.com

Posts: 1432
Joined: 5/11/2007
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'94 has many unique parts as well. That's what will get really tough are the one year only items.

_____________________________

Ken Karr
Motorcars, Ltd. 800 338 5238 x626
www.motorcarsltd.com

(in reply to JagtechOhio)

Post #: 20