by the ecu in my 88 there is a long pigtail with two red
connectors on it…one connector has a jumper connecting it
and the other is larger with many places to plug
in…exactly what is this ???–
scrimbo
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In reply to a message from scrimbo sent Mon 15 Aug 2016:
Probably the ‘‘feedback monitor socket’’.
From the book page 294:
FEEDBACK MONITOR SOCKET: Near the ECU within the trunk is a
4-connector socket on the end of a harness
with a dummy plug in it. Two connectors are a black ground
wire and a KB wire with battery voltage on it. The other
two connectors provide a voltage between 0 and +5V (relative
to the black ground wire) that corresponds to the amount
of correction the ECU is providing in its attempts to
maintain the proper Lambda feedback. The GW wire (pin 4 on the
ECU) is for the A bank and the GK wire (pin 10) is for the B
bank.–
David Christensen, Tucson, 13 XJ, 91 XJS Conv, 65 Etype OTS
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In reply to a message from davchr sent Tue 16 Aug 2016:
Most likely, but the OP continues to post without telling us
exactly what car he has ('88 and '89 saw many running
changes). Don’t know why – I urged him twice in the last
week to add this to his signature line.
Anyhow, there are a number of modules in the boot. Not to
mention the fuse/relay panels on each side. Late cars have
there security modules and the TCM units as well.
As far as the diagnostic sockets go – not all cars have
them and they appear to be model-year/market specific (the
quote text applies to Kirby’s car, presumably?).
This is for example what one finds in the boot (right-hand
side) of a 6.0L V12 car:
http://www.jag-lovers.org/v.htm?id=1435190676
Steve–
The original message included these comments:
Probably the ‘‘feedback monitor socket’’.
From the book page 294:
FEEDBACK MONITOR SOCKET: Near the ECU within the trunk is a
4-connector socket on the end of a harness
with a dummy plug in it. Two connectors are a black ground
wire and a KB wire with battery voltage on it. The other
two connectors provide a voltage between 0 and +5V (relative
to the black ground wire) that corresponds to the amount
of correction the ECU is providing in its attempts to
maintain the proper Lambda feedback. The GW wire (pin 4 on the
ECU) is for the A bank and the GK wire (pin 10) is for the B
–
'95 XJS convertible - V12 6.0L
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In reply to a message from sbobev sent Tue 16 Aug 2016:
I don’t know what you mean by signature line–
scrimbo
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In reply to a message from davchr sent Tue 16 Aug 2016:
this is on a pigtail with about 14 ‘’ of wire hooked to
nothing at the red connectors…I said on my 88 coupe. and
still don’t know what someone said is a '‘signature line’'for
posting???–
The original message included these comments:
4-connector socket on the end of a harness
–
scrimbo
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In reply to a message from scrimbo sent Tue 16 Aug 2016:
Log onto jag lovers and then use edit profile button. A
little down page is optional info section, you will see
mention of signature. List your relevant vehicles in the
box provided.–
The original message included these comments:
still don’t know what someone said is a '‘signature line’'for
posting???
–
stephen davis 1976 XJ-S, 1989 XJR-S, Sl SWB XJ12 x 3
gorae, Australia
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this is on a pigtail with about 14 ‘’ of wire hooked to
nothing at the red connectors…I said on my 88 coupe.
Sounds exactly like the feedback jumper. When checking the proper operation of the O2 sensors, you’re supposed to unplug the jumper and plug in the high-dollar special Jaguar diagnostic contraption, which uses the other two connectors for something – perhaps just 12V power.
The only problem with all that is that I didn’t think the XJ-S came with that diagnostic connector as late as your car. Did your car come with single-wire oxygen sensors or 3-wire?
– Kirbert
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