[xj] Trip computer

XJ
21

My trip computer works sometimes.but don’t work when
pushing buttons. Is this a common problem. Is this unit
connected to main ECU?

Assuming you have display, Daniel - the unit has power, and the fault
depends on what functions are missing…

The computer has two power feeds; constant, ‘standby’, power (car brown,
computer purple) and green, power with ign ‘on’. Actually, there is also
a third; red/blue to dim the display with lights on…:slight_smile:

‘Time’ is run by the internal clock - pushed, it initially shows driving
time, then switch to normal clock function. "avspd’ is computed using the
clock and the speed transducer on the gearbox. "dist’ is computed from the
transducer directly. ‘ave’ is computed from transducer and ECU for average
fuel consumption. ‘inst’ uses the transducer and the ECU to compute instant
fuel consumption. And ‘fuel’ uses ECU give total fuel consumed…so…?

All data, except clock and some transducer data, goes through an interface
unit…

Adventures souls have accessed the computers internals for repairs - which
requires some nous, referred

Frank
xj6 85 Sov Europe (UK/NZ) to in the Archives…:slight_smile:

Is there a trick to fix connector
shorts, ETc any input anyone cheers-----Original Message-----
From: sawyer10702
Sent: Thursday, January 01, 2015 2:23 PM
To: xj@jag-lovers.org
Subject: [xj] Trip computer

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22

In reply to a message from Frank sent Wed 31 Dec 2014:

Had the trip computer out today took it out checked
voltages all voltages coming from plugs check out to
12.58v on full time #6 power supply, # 7 lights on power
11.54v, ign on power #8 11.87v engine off…I opened the
unit up took a soldering iron to all solder joints no
differance still 8888 on display last week it decided to
work for a while until I pushed reset then 8888 again so I
will let it have battery power over nite to I guess
rethink about what it’s doing…so next if that gives no
joy will adventure into the boot to check connections to 2
and 3 interface unit and speed transducer and see if they
are making good connections…speedo works fine so I know
signal is working from tranmission…any thoughts I tried
to check out www.backglass website buy no page
displaying…is there anything on this site please direct
me with info please and cheers and happy New Year everyone
be safe–
Daniel Sawyer
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23

In reply to a message from Frank sent Wed 31 Dec 2014:

Had the trip computer out today took it out checked
voltages all voltages coming from plugs check out to
12.58v on full time #6 power supply, # 7 lights on power
11.54v, ign on power #8 11.87v engine off…I opened the
unit up took a soldering iron to all solder joints no
differance still 8888 on display last week it decided to
work for a while until I pushed reset then 8888

Which is the brief display at start-up, before the computer starts
computing…:slight_smile:

In principle, in ‘time’ a working computer should show the clock - this does
not rely on any external inputs. If it refuses to show the clock, stays in
8888 when ‘time’ is selected; it implies the fault is entirely internal -
excluding the very faint possibility that the ‘time’ button itself does not
connect/switch…

Nominally, the standard procedure for computer malfunctions is to disconnect
all power for some seconds - which you have already tried. This is ancient
technology and I have been unable to locate a wiring diagram - but a guess
is that the computer microchip has failed…just a guess mind you.

That the thing works occasionally implies an intermittent fault - which does
not make things easier. Being handy with a soldering iron; you may locate a
replacement chip - I don’t think that seeking external fault sources will
lead anywhere - but no harm will come of that either…

Frank
xj6 85 Sov Europe (UK/NZ)

again so I
will let it have battery power over nite to I guess
rethink about what it’s doing…so next if that gives no
joy will adventure into the boot to check connections to 2
and 3 interface unit and speed transducer and see if they
are making good connections…speedo works fine so I know
signal is working from tranmission…any thoughts I tried
to check out www.backglass website buy no page
displaying…is there anything on this site please direct
me with info please and cheers and happy New Year everyone
be safe-----Original Message-----
From: sawyer10702
Sent: Friday, January 02, 2015 6:14 PM
To: xj@jag-lovers.org
Subject: Re: [xj] Trip computer

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24

In reply to a message from Frank sent Fri 2 Jan 2015:

please keep this updated as I am having this very same problem
. I drive a '84 xj6 III. all I can find on this subject is –
disconnect power and wait … bla bla bla. doesn’t seem to me
that jaguar, or anyone would make such a faluty designed
product right out of the gate … seems to be a problem with
every unit ever made.
if could just get the clock to work, I could care less about
the actual trip computer.
anyways … hope to hear something good here soon.
also … there is a mention of some wiring in the boot that I
should check … first I’ve heard of this ??–
philipE
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25

philipE,

"seems to be a problem with every unit ever made"?   I have properly

functioning trip computers in 3 Series III XJs and an XJ-S convertible and
have found them to be very accurate and reliable. Over the past 15 years I
have never seen the 8888 problem in any of my Jaguars and all my trip
computers function properly (although I did have to disassemble the one in
my 1990 V12 VdP to replace a burned out bulb and adjust it for US gallons
instead of Imperial gallons). I have seen the 8888 problem mentioned
occasionally on this list, but not very often. Replacement trip computers
can usually be purchased on ebay for about $50 with shipping included, in
case you needed one.

   The interface unit between the EFI and trip computer is located in

the boot just beneath the sliding roof motor. It’s the black box with “XK
4.2L 6 cylinder” printed on it. This is shown in Figures 18.1 and 18.2 of
the Jaguar Series III Electrical Guide (S-57) manual. This is how the
fueling signal is provided to the trip computer.

Regards,

Paul M. Novak

1990 Series III V12 Vanden Plas
1990 XJ-S Classic Collection convertible
1987 XJ6 Vanden Plas
1984 XJ6 Vanden Plas
1969 E-Type FHC
1957 MK VIII Saloon
Ramona, CA
P.M.Novak7@gmail.com-----Original Message-----
From: owner-xj@jag-lovers.org [mailto:owner-xj@jag-lovers.org] On Behalf Of
philipE
Sent: Friday, January 02, 2015 6:52 PM
To: xj@jag-lovers.org
Subject: Re: [xj] Trip computer

In reply to a message from Frank sent Fri 2 Jan 2015:

please keep this updated as I am having this very same problem . I drive a
'84 xj6 III. all I can find on this subject is – disconnect power and wait
… bla bla bla. doesn’t seem to me that jaguar, or anyone would make such a
faluty designed product right out of the gate … seems to be a problem with
every unit ever made.
if could just get the clock to work, I could care less about the actual trip
computer.
anyways … hope to hear something good here soon.
also … there is a mention of some wiring in the boot that I should check …
first I’ve heard of this ??

philipE

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26

Paul:
I also found the comment about the trip computers to be a b it strange -
having owned 21 Series III cars with the trip computers, I never had a
single problem with them. We should remember, in this age of electronic
marvels that are sometimes also called automobiles, that the trip computer
in the 1983-onwards Jaguar was advanced technology!

Gregory
Victoria, Canada-----Original Message-----
From: Paul M. Novak
Sent: Friday, January 02, 2015 11:06 PM
To: xj@jag-lovers.org
Subject: RE: [xj] Trip computer

philipE,

“seems to be a problem with every unit ever made”? I have properly
functioning trip computers in 3 Series III XJs and an XJ-S convertible and
have found them to be very accurate and reliable.

-----Original Message-----
From: owner-xj@jag-lovers.org [mailto:owner-xj@jag-lovers.org] On Behalf Of
philipE
Sent: Friday, January 02, 2015 6:52 PM
To: xj@jag-lovers.org
Subject: Re: [xj] Trip computer

. doesn’t seem to me that jaguar, or anyone would make such a
faluty designed product right out of the gate … seems to be a problem with
every unit ever made.

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27

In reply to a message from Dr. Gregory Andrachuk sent Sat 3 Jan 2015:

Odd little critters, but interesting. Mine tells time and
does some other d stuff. where it gets any fuel data is a
mystery to me as the original EFI unit went to Texas a few
years ago to help a guy get his car running.

And, yes, it does the 8888 thing on booting up then goes to
the time of day display.

Hot booting is old tech for reluctant electronic critters.
I managed to get a few more months out of an od ACER that
had boot issues by that process.

Crude but at times, effective. And, not to forget
percussion maintenance, cruder, but often works.

My daughter told me her '‘experienced’ Apple lap top went
dark. Hot boots to no avail. I forgot to advise the ‘‘give
it a whack’’ technique!

The trip computer in my Jeep s a decade newer. It does lots
of neat stuff and in much bigger and brighter fonts!!!

Carl–
The original message included these comments:

I also found the comment about the trip computers to be a b it strange -
having owned 21 Series III cars with the trip computers, I never had a
single problem with them. We should remember, in this age of electronic
marvels that are sometimes also called automobiles, that the trip computer
in the 1983-onwards Jaguar was advanced technology!

–
Carl Hutchins 1983 Jaguar XJ6 with LT1 and 1994 Jeep Grand
Walnut Creek, California, United States
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28

In reply to a message from cadjag sent Sat 3 Jan 2015:

My trip computer does on occasion give me the 888-generally
that is a sign to put the battery on a charger. I had the
same problems. no information on mpg, but it did tell me how
far i had gone… I replaced the interface in the boot-and
it worked like a champ ever since.–
The original message included these comments:

And, yes, it does the 8888 thing on booting up then goes to

–
1986 Daimler Sovereign Laundette.
London, United Kingdom
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29

In reply to a message from Dr. Gregory Andrachuk sent Sat 3 Jan 2015:

Odd little critters, but interesting. Mine tells time and
does some other d stuff. where it gets any fuel data is a
mystery to me as the original EFI unit went to Texas a few
years ago to help a guy get his car running.

It would certainly tell correct time, Carl - the clock data are internal to
the unit. But ‘…does some other stuff…’ probably means that transducer
data distance and time related should be correct. All fuel data should be
missing and incorrect …?

And a happy new year to you!

Frank

And, yes, it does the 8888 thing on booting up then goes to
the time of day display.

Hot booting is old tech for reluctant electronic critters.
I managed to get a few more months out of an od ACER that
had boot issues by that process.

Crude but at times, effective. And, not to forget
percussion maintenance, cruder, but often works.

My daughter told me her '‘experienced’ Apple lap top went
dark. Hot boots to no avail. I forgot to advise the ‘‘give
it a whack’’ technique!

The trip computer in my Jeep s a decade newer. It does lots
of neat stuff and in much bigger and brighter fonts!!!-----Original Message-----
From: cadjag
Sent: Sunday, January 04, 2015 6:02 AM
To: xj@jag-lovers.org
Subject: Re: [xj] Trip computer

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30

In reply to a message from Frank sent Sat 3 Jan 2015:

Frank:

Thanks and Happy New Year to you and yours!!

The transducer on the BW 66 is long gone. so, where it gets
distance, if it does is a mystery!!

I could mess with it and get fuel data from tapping an
injector. And dampen the pulses from the VSS output of the
transmission presently in place.

Way down the list of todo’s!!

Tis colder in the garage than outside!!!

Carl–
The original message included these comments:

It would certainly tell correct time, Carl - the clock data are internal to
the unit. But ‘…does some other stuff…’ probably means that transducer
data distance and time related should be correct. All fuel data should be
missing and incorrect …?

–
Carl Hutchins 1983 Jaguar XJ6 with LT1 and 1994 Jeep Grand
Walnut Creek, California, United States
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31

In reply to a message from Frank sent Sat 3 Jan 2015:

Frank:

Thanks and Happy New Year to you and yours!!

The transducer on the BW 66 is long gone. so, where it gets
distance, if it does is a mystery!!

I could mess with it and get fuel data from tapping an
injector. And dampen the pulses from the VSS output of the
transmission presently in place.

Way down the list of todo’s!!

Wisely so, Carl…

I do assume that you have a correct speedo reading - and the original Jag
speedo needs very specific inputs for ‘some’ speedo transducer, data which
is shares with the driving computer. Fuel data is computed from adding
injector opening times - but while initiated by the ECU it is converted by
the interface unit, specific to each ECU/engine type…

So without either, the fuel data given by the driving computer must be
purely random, if any at all. You don’t elucidate as to what you are reading
on the computer…?

Bu using the injector signal directly is an interesting thought…:slight_smile:

Frank

Tis colder in the garage than outside!!!

The original message included these comments:-----Original Message-----
From: cadjag
Sent: Monday, January 05, 2015 4:44 AM
To: xj@jag-lovers.org
Subject: Re: [xj] Trip computer

It would certainly tell correct time, Carl - the clock data are internal
to
the unit. But ‘…does some other stuff…’ probably means that transducer
data distance and time related should be correct. All fuel data should be
missing and incorrect …?

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32

In reply to a message from philipE sent Fri 2 Jan 2015:

I took mine apart and played around checking diodes,
capacitors etc re soldering all parts again around board,
checked all the wires that connect to other board…hook it
straight up to my 12v supply in garage, disconnected it
for a whole day…so my conclusion is one of the chips is
bad but which one??? I think I will find another…don’t
bother checking in boot those wires messing won’t do
anything…has I said it’s out connected to power
supply…the only site with any clue is from
duncan@backglass.com he has info and also on this site
jaguar documentation…so Philip that’s all I got mate
let me know if you find anything cheers I will post
anything else I find :)–
The original message included these comments:

disconnect power and wait … bla bla bla. doesn’t seem to me
every unit ever made.
also … there is a mention of some wiring in the boot that I
philipE

–
Daniel Sawyer
–Posted using Jag-lovers JagFORUM [forums.jag-lovers.org]–
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33

In reply to a message from philipE sent Fri 2 Jan 2015:

I took mine apart and played around checking diodes,
capacitors etc re soldering all parts again around board,
checked all the wires that connect to other board…hook it
straight up to my 12v supply in garage, disconnected it
for a whole day…so my conclusion is one of the chips is
bad but which one???

Without a wiring diagram it is a hopeless task, Daniel - even with one it
requires some nous…and luck…:slight_smile:

Most driving computer repairs, if ‘most’ is the right word for an occasional
fix, relates to something obvious. However, it would be nice if somebody
could find a source, or even an identification, of those old chips. Though
getting a replacement for the whole unit seems easier…:slight_smile:

Frank
xj6 85 Sov Europe (UK/NZ)

I think I will find another…don’t
bother checking in boot those wires messing won’t do
anything…has I said it’s out connected to power
supply…the only site with any clue is from
duncan@backglass.com he has info and also on this site
jaguar documentation…so Philip that’s all I got mate
let me know if you find anything cheers I will post
anything else I find :slight_smile:

The original message included these comments:-----Original Message-----
From: sawyer10702
Sent: Wednesday, January 07, 2015 2:09 PM
To: xj@jag-lovers.org
Subject: Re: [xj] Trip computer

disconnect power and wait … bla bla bla. doesn’t seem to me
every unit ever made.
also … there is a mention of some wiring in the boot that I
philipE

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34

In reply to a message from philipE sent Fri 2 Jan 2015:

Don’t know if this helps but try this link

http://www.backglass.org/duncan/jag/ifu/--
Alyn
Seattle WA, United States
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35

In reply to a message from Alyn sent Fri 9 Jan 2015:

The interface in the boot is the next item for me to check.
I have been through a number of trip units, but I still
keep getting low instant / avg numbers.

Lou
San Diego, Calif
'83 xj6–
Louie
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36

In reply to a message from Alyn sent Fri 9 Jan 2015:

The interface in the boot is the next item for me to check.
I have been through a number of trip units, but I still
keep getting low instant / avg numbers.

The interface unit is arguably specific to the ECU and the diff ratio/tyre
size, Lou - though nominally the tyre rotations is supposedly taken care of
by the transducer…

The driving computer is normally very precise, but comparing computer
read-out with actual mileage/fuel fill has some pitfalls. Obviously, if the
odometer is at variance with the actual distance it will give wrong
information to the computer. Another factor is fuel pressure; the ECU
delivers injector opening times as a basis for the computer’s fuel
consumption computations.

If the fuel pressure is wrong, the actual consumption will be at variance
with the computed data. And strangely enough, if fuel pressure is low,
increased petrol consumption may result as more pedal is used - and
excessive pressure may also increase consumption as fuel is not completely
combusted. And as hot fuel has less density than cold , more opening times
are required for the same power output…:slight_smile:

The computer is also a good diagnostic tool for detecting leaks - external
or within the injectors themselves. I assume that the ‘fuel’ readings, fuel
actually used, is also wrong…?

In addition to the interface unit - have a look at other factors
mentioned…

Frank
xj6 85 Sov Europe (UK/NZ)-----Original Message-----
From: Louie
Sent: Saturday, January 10, 2015 7:47 AM
To: xj@jag-lovers.org
Subject: Re: [xj] Trip computer

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37

In reply to a message from Frank sent Fri 9 Jan 2015:

If you want a variety of info about the workings of the TC
and Interface unit, go to the ‘‘Search Forums’’ on this site
and search the LUMPS section for ‘‘trip computer’’.

A lot of ‘‘lumpers’’, in the course of swapping a GM V8 into
the beast, come to the issue of making the TC and Inteface
talk to the new computer and determine its fuel flow
characteristics, and display the proper info… A fellow
named Lockheed has posted some really good explanations of
how they all work together and what adjustments can be made
if you are handy with a soldering iron.

I came across this info during the course of my own swap.–
Alyn
Seattle WA, United States
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38

In reply to a message from sawyer10702 sent Thu 1 Jan 2015:

Happy Spring to all Jag Folks. I have not though much about
driving the English Car-- 83 XJ6-- since today we are
enjoying -12 Centigrade.!!! That’s about 100 miles North
of Toronto Ontario----------------Canada.
I was browsing the Forum and smiled at entries in mid
January from some of our regulars regarding the Trip
Computer. Unlike some— I owned 3 Series III and all
the TC failed and were replaced by used – almost as bad
bits. Its hard to accept a person having 20 plus S III with
no issues. So when I crawl out of the snow bank----- soon—
I will be on the look out for ANOTHER TC. What is the
latest supply of said item?

The current one works – then there is blank. for weeks.
Then a miracle— you start car and time is there-- and
various other digits-- who knows if reliable. It gets old
explaining to others what use the TC is. LOL–
The original message included these comments:

In reply to a message from Frank sent Wed 31 Dec 2014:
be safe

–
wpw
ontario, Canada
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39

In reply to a message from wrigs sent Fri 27 Mar 2015:

eBay provide the easiest source, no real way to check
though. It’s just s case of paying your money and taking
your chances. However if the functionality is
intermittent- it would most likely be a wiring issue.
There is a lot of info in the archives.–
1986 Daimler Sovereign Laundette.
London, United Kingdom
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===================================================
The archives and FAQ will answer many queries on the XJ series…
FAQs: http://www.jag-lovers.org/xjlovers/xjfaq/index.html
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40

In reply to a message from wrigs sent Fri 27 Mar 2015:

I since did away with the meter and put in a clock so if
anyone wants p�rts or old trip meter with a display unit
that works but only when it wants to it all yours loo–
Daniel Sawyer
–Posted using Jag-lovers JagFORUM [forums.jag-lovers.org]–
–Support Jag-lovers - Donate at http://www.jag-lovers.org/donate04.php –

===================================================
The archives and FAQ will answer many queries on the XJ series…
FAQs: http://www.jag-lovers.org/xjlovers/xjfaq/index.html
Archives: http://www.jag-lovers.org/lists/search.html

To remove yourself from this list, go to http://www.jag-lovers.org/cgi-bin/majordomo.

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