Still deep in my complete underbonnet (underhood) detailing
programme, I notice that there is a great deal of back-lash in the
drive to the throttle position rheostat below the pulley- the drive
pin diameter is much smaller than the plastic link it passes
through. Does anyone know why?
On another issue, I have had a new injector harness made by The
Wiring Harness Co. here in England, not cheap at almost $500, but
the wire is high-temp, and is the correct colour; also the original
multi-plug is re-used and new correct-style injector plugs fitted.
The same company also did a great job of refurbishing the main
electrical harness (the one that goes back to the foot-well ECU on
later cars) which was badly frayed and scruffy where it runs along
the fuel rail to the front crossmember. Looks like new now.
Michael Marsh 1990 XJ-S V12 convertible.–
Michael Marsh
–Posted using Jag-lovers JagFORUM [forums.jag-lovers.org]–
My 93 4.0 XJS 5-speed TPS just failed. I believe it was a DBC2626
that is apparently no longer available and was used on the late
93s and all 94s. I searched the net and our archives and have not
yet discovered a viable replacement. Soooo…My question is: Can I
use the TH-413 sensor that is so common on ebay if I splice my
black square plug to the sensor? (the red sensor seems to be
identical) If so, does ANYONE know the wires to splice? I cant
tell if the color codes are the same for both plugs. Your help is
GREATLY appreciated!!!–
The Boneman
–Posted using Jag-lovers JagFORUM [forums.jag-lovers.org]–
In reply to a message from The Boneman sent Mon 3 Oct 2016:
I don’t know if this will work, but I found this…
''The TPS units are the same from 1990 to 1994 XJ6 but the
HARNESS CONNECTORS ARE DIFFERENT. There are round ones
and ‘squarish’ ones. The earlier 1988/89 have only 3 wires
because the gearbox is completely hydro-mechanical and does no
not need the throttle input.
You can get a Blue round plug TPS and splice the black
connector to make it work. They were for the 1990 to 1992
XJ6 but as long as it has 6 wires (3 for the engine and 3
for the gearbox) it will function.’’–
1996 XJS 2+2 Convertible with 4.0L AJ16
–Posted using Jag-lovers JagFORUM [forums.jag-lovers.org]–
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In reply to a message from Veekay sent Tue 4 Oct 2016:
TH413 is presumably just that unit. Since your car is 5-
speed manual, you don’t need six wires coming out of the
TPS. Soldering the Sumitomo 6-pin connector in place of the
round connector should do it.
The 6.0L V12 uses the same TPS and I’ve been contemplating
doing the same. The ONLY thing I am not sure is the idle
voltage. Older V12’s require the TPS to be set at 0.32V for
proper idle, the 6.0L V12 calls for 0.6V.
Do you guys know what is the specified idle voltage from the
TPS on the AJ6 engines?
Steve–
The original message included these comments:
I don’t know if this will work, but I found this…
‘‘The TPS units are the same from 1990 to 1994 XJ6 but the
HARNESS CONNECTORS ARE DIFFERENT. There are round ones
and ‘squarish’ ones. The earlier 1988/89 have only 3 wires
because the gearbox is completely hydro-mechanical and does no
not need the throttle input.
You can get a Blue round plug TPS and splice the black
connector to make it work. They were for the 1990 to 1992
XJ6 but as long as it has 6 wires (3 for the engine and 3
for the gearbox) it will function.’’
Kirbert
(Author of the Book, former owner of an '83 XJ-S H.E.)
5
The earlier 1988/89 have only 3 wires
because the gearbox is completely hydro-mechanical and does no
not need the throttle input.
It sounds like the 6-cyl went the same way as the V12’s did around the same
time, going from a single-track TPS (3 wires) to a dual-track TPS (six wires)
with the second set used for a signal to the newfangled electronically
controlled transmission.
I have no idea why there’d be two different 6-wire TPS’s that differ only in the
plug, unless the older style plug was found to cause a problem of some sort.
It certainly sounds, though, like you could buy the TPS that’s available, cut
the plug off, and splice on the plug from your old TPS. Or, perhaps even
better, you could find a suitable car in the junkyard, cut the socket off the
harness, take it home and splice it together with the plug off your old TPS to
create an adapter to allow you to plug in the new TPS as-is. From then on,
you could use EITHER style of TPS by choosing to use your adapter as
needed.
– Kirbert
// please trim quoted text to context onlyOn 4 Oct 2016 at 7:04, Veekay wrote:
Kirbert
(Author of the Book, former owner of an '83 XJ-S H.E.)
6
Since your car is 5-
speed manual, you don’t need six wires coming out of the
TPS.
Hey, you might not need a new TPS at all! If it’s got six wires and you’ve got
a stick, three of those wires (one track) aren’t being used. You could swap
those three for the other three to use the other track, which might be in good
shape.
– Kirbert
// please trim quoted text to context onlyOn 4 Oct 2016 at 10:48, sbobev wrote:
In reply to a message from Kirbert sent Tue 4 Oct 2016:
Jaguar issued a PARTS TSB (XJS C-11) in 05/01 stating that…
The Bourne (black) throttle potentiometer (EAC 2670) used on
engines from engine no. 8S16400-8S61794 is no longer
available. Vehicles requiring a new potentiometer should be
updated to the later Lucas (red) throttle potentiomer. This
modification requires all the parts listed below.
A EBC 3566 Spindle
B EBC 3568 Coupling
C PA 103161/J Spring Pin
D EAC 9567 Adapter Housing
E EAC 9634 Potentiometer
I don’t know if any of these are still available.
I posted the TSB on the internet so it should be available
for reading. Maybe GUS has it on his site?
I’m sure people have modified the throttle quadrant to
accept a compatible TPS.
In reply to a message from Kirbert sent Tue 4 Oct 2016:
I’m not sure why the wiper wire was not simply
piggybacked for gearbox purposes rather than a
dedicated track. Works for me with aftermarket
TCU.–
The original message included these comments:
It sounds like the 6-cyl went the same way as the V12’s did around the same
time, going from a single-track TPS (3 wires) to a dual-track TPS (six wires)
with the second set used for a signal to the newfangled electronically
controlled transmission.
In reply to a message from The Boneman sent Mon 3 Oct 2016:
Thanks everyone fo your input! I just purchased a TH-413, also
known as the DBC2889 with the blue connector. I will splice it on
to my original connector (square black) and will report back on
how that works out to settle this issue once and for all. FYI, I
got a new unit on eBay for $125.00. Several are available for
$340+ but there are a few that are more reasonably priced. There
were even a couple of used ones in the $80 range. Anyway, stay
tuned and I’ll report back as soon as the unit arrives and I get
it installed. Thanks again!–
The Boneman
–Posted using Jag-lovers JagFORUM [forums.jag-lovers.org]–
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// please trim quoted text to context only
Kirbert
(Author of the Book, former owner of an '83 XJ-S H.E.)
10
I’m not sure why the wiper wire was not simply
piggybacked for gearbox purposes rather than a
dedicated track. Works for me with aftermarket
TCU.
I think it’s because the EFI system and the gearbox each have their own 5V
power supplies for energizing such senders, so taking the signal voltage off
one to send to the other might not work properly. If they had all used the same 5V power supply, it probably would have worked fine. It might work
fine anyway if both 5V power supplies are grounded to the chassis and they
both produce pretty close to the same 5V.
– Kirbert
// please trim quoted text to context onlyOn 5 Oct 2016 at 5:14, baxtor wrote: