my speedometer works intermittently!.. at times works fine,
then stops… it seems random.
the only other problem I have with the car is the ABS light is
always on… is there a way to change a fuse, connector or
something by myself to keep the speedometer working?
lastly, the front brakes are new the rear brakes work fine…
can I drive my car without the ABS?–
555randolph
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In reply to a message from 555randolph sent Mon 20 Jun 2011:
To help troubleshoot� See if the cruise control still works
when the speedo is malfunctioning. If it does, then your
speedo transducer (on differential) and the interface unit
(in trunk) are OK since speedo and cruise are feed off the
same circuit. In that case, you may simply have a bad
connection at the instrument cluster. If cruise is
inoperative when speedo goes out, then you may have an issue
with one of those two components (transducer or interface).
The former was the case with my �90 XJS � intermittent
speedo outage but cruise still worked. I removed the
instrument cluster (5 screws I believe, 2 of them hidden in
the top corners behind small plastic covers), removed the
ribbon connectors, and thoroughly cleaned all connections.
For the past year, all was well. Recently it�s started
happening again though not as much. I read here that adding
another ground connection to the instrument cluster can help
with this as well. I plan to do that soon (as well as
cleaning connections again).
Hope this helps.
Regards,
Dave–
Dave - '86 XJ6, '90 XJS,
Huntsville, AL, United States
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Yes, you can safely drive the car with the ABS disabled (“Anti-Lock”
light on), as you have boosted conventional braking, just no ABS
protection.
However, there is an onboard diagnostic (blink codes) that you can use
to identify the ABS fault. Do the following to record the blink codes,
and then post the code(s) here and someone can tell you what they mean,
or if you have the Service Manual, you can find the procedure and codes
at Section 70, Brakes:
Carry out on-board fault diagnosis procedure as follows:
1 Ensure that the ignition is OFF.
2 Locate the 3-way Econoseal diagnostic connector in the left rear
wheel arch, close to the ABS ECU.
3 Insert a ‘short’ (JDS Reference lead) across the black lead (ground)
and the Brown/Pink lead (trigger line
to pin 26 of the ECU).
4 Turn the ignition ON (position 2) and observe the warning lamp.
5 After six seconds the blink sequence of the first code begins.
6 Count the blink pulses and vvrite down the resulting two digit
number. After a (3.5 seconds pause the next
code begins, and so on, until all the failure codes are read out and
the warning light remains off.
7 Remove the ‘short’ lead and switch the ignition OFF.
George Balthrop, Clifton, VA USA
89 and 85 XJ-S Coupes; 89 XJ40 VDP-----Original Message-----
From: 555randolph rerprobst@yahoo.com
the ABS light is
always on…
lastly, the front brakes are new the rear brakes work fine…
can I drive my car without the ABS?
// please trim quoted text to context only
In reply to a message from 555randolph sent Mon 20 Jun 2011:
update on abs & speedometer problem…
I found the front left wire/connector to the sensor had been
frayed (apparently by the hood cover closing on the wire as
it must have worked its way up over the lip of the engine
compartment and smashed as the hood was closed)… I
repaired the wire aas best I could (connected the inner wire
together and wove in new outer wire around it and taped it
up… the abs light now is OFF!.. but, the
speedometer does not work…
I was told that model 1994 does not have a transducer on the
transmission, but rather relies on information from the
sensors on the wheels…
am I looking at the same problems and the solutions posted
to fix the speedometer? or, are there other solutions since
the abs light is now OFF?
thank you guys so much for the posts!–
The original message included these comments:
my speedometer works intermittently!.. at times works fine,
the only other problem I have with the car is the ABS light is
always on… is there a way to change a fuse, connector or
–
555randolph
–Posted using Jag-lovers JagFORUM [forums.jag-lovers.org]–
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The “transducer” on the transmission was used until ~1988 when a change
was made to the speed sensor mounted on the right rear face of the
differential, and a speed interface unit on the left side of the boot.
That same setup is used on your 94 model. The ABS wheel sensors, or
anything else at any wheel, have NOTHING to do with the speed signal to
(1) the speedometer, (2) the cruise control, or (3) the trip computer
distance function, ALL of which get their signals from the speed sensor
and speed interface unit descirbed above.
If either your cruise control or your trip computer distance function
are working when the speedo quits, then the problem is at the speedo.
If you don’t have the JDHT Electrical Technical Guides (highly
recommended) then go to this site, download the Electrical Guide for
your 94 model, and refer to the circuit diagrams Fig.9, Instrument
Pack, and Fig.10, Trip Computer:
http://www.captainjaguarscathouse.com/Electrical_Reference.htm
George Balthrop, Clifton, VA USA
89 and 85 XJ-S Coupes; 89 XJ40 VDP-----Original Message-----
From: 555randolph rerprobst@yahoo.com
speedometer does not work…
I was told that model 1994 does not have a transducer on the
transmission, but rather relies on information from the
sensors on the wheels.
// please trim quoted text to context only
In reply to a message from George Balthrop sent Wed 22 Jun 2011:
thanks so much George for the info… will download and study
the system…–
555randolph
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In reply to a message from Sparky-88 sent Tue 21 Jun 2011:
thanks Dave for the info… I am reading the schematics and
will attempt to try and solve the problem w speedo–
555randolph
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555randolph wrote:
lastly, the front brakes are new the rear brakes work fine…
can I drive my car without the ABS?
If this is a Teves system, depends on how you disable it. If you
shut off the pump, you’ll have no assist and no rear brakes.
– Kirbert
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I have a 1988 XJS with a TH400 but have converted to a 5 speed and am trying to get the speedo to work with the rear end of a 1994. The 5 speed Tremec does not support the DAC4569 impulse sender. I can make the speedo spin when I twist the small paddle at the end of the DAC4569 with it wired up in my hand. Now I am trying to use the pulse signal from the differential. Unfortunately I missed the cut off In 1988, the pulse generator DAC4569 on the transmission was eliminated. The speedo interface and diff mounted speedo transducer began with VIN 144263, about half way thru the '88 model year.
I can see the diff signal in the trunk across the red and blue wires looking at resistance an voltage changes with wheel spinning by hand. I have been sending the output from the trunk to where the DAC4569 was connected.
I have a used speed interface that should send a signal to the speedo connections but the speedo does not move.
Any help would be great.
Thanks for your help.
Chris
And don’t forget - while you have the cluster out put a few extra earth points in. Worked wonders with my '87 coupe…
My 88 went through that for awhile … seemed like it did it on hot days??? … Anyway I thought it might have been loose wire under car…it would jump speedo needle up and down… this lasted off and on a few weeks…but it never did it again