Question about 1993 Jaguar XJ6

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XJ40 1992 Need schematic/logic inside the ECU

Where can I free download the schematic/logic inside the ECU?
I have already a lots of manuals/CD but not showing the ECU logic..!
LUCAS 15CU, 3.2L DBC 9632 or superseedings.
For troubleshooting my car. I have not ECU Ground output for the Fuel Pump relay.
Thierry

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  • Jaguar Master
  • 22,156 Answers

Your joking ,ECU diagram ,now thats like asking the queen for the keys to the crown jewels,If no grnd for the fuel pump then you have a problem with the alarm system

Posted on Dec 14, 2009

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1 Answer

Can't find turn signal flasher unit


Older vehicles can and often did have the flasher unit almost anywhere - behind the speedo, inside the steering column shroud, under the dashboard, behind the glovebox... Then there was a lengthy period when the fusebox was the logical place to find the electronic relay that often shared duty as the hazard flasher unit.

Lots of modern cars do not have a separate flasher unit but are fitted instead with a single ECU dedicated to controlling all those things on a car needing timing - flashers and hazard flashers, interior lights screenwipers and so forth.

Mar 13, 2016 | Cars & Trucks

1 Answer

2005 honda civic daylight are not working fuse are ok


DRL, are you in Canada?
Daytime, running lights.
did you pull the module to see the very common burned up pins?
plastic all ugly and burnt?

DRL module is just LOGIC.
it has inputs that must be good for it to work.
one hand brake, it must be off
the other is on many cars, Alternator not bad, it cuts DRL
so the battery charge is saved so you can drive with EFI not going dead so soon. (ECU/PCM needs DC power to run engine)

the fsm covers this
as does alldata.com
use the schematic of DRL to see what pins need what logic state to work. if confused ask questions.

Jan 26, 2014 | Honda Cars & Trucks

1 Answer

Fuel injection fuse keeps blowing


can be lots of things, top reasons are.
is this the 16valve.>? or 8?
shorted ECU, caps shorted out , inside, (1 time event)
shorted injectors 1 of 4
shorted fuel pump very common. and overloads ECU 12v power lines
16v only:
http://www.fixkick.com/ECU/92-95MPI-eng-schematic_files/92-95mpi-eng-full-size-huge.png

ecu shorting is vary common 89 to 95, and never newer years.

http://www.fixkick.com/ECU/ECU.html

more schematics, if not 16v see em, here.
http://www.fixkick.com/schematics-run.html


i use and DC amp clamp meter to find who is shorted (acid test way)

Dec 22, 2013 | 1995 Geo Tracker

1 Answer

I have a 1992 Honda civic lx with a 1.5 four cylinder, and Ive replaced the ignition switch the fuel pump relay and the fueled pump itself however, the fuel pump still doesn't prime when I turn the key...


no start , crank perfectly
so , got spark?
the ECU has programming (ROM) and in fact kills all fueling with no spark , (even if it thinks there is no spark, even if spark is ok)
all ECU use a way to read back spark quality, (ALL){LAWS}
how honda does it in code, i don't know , see C R O M E forum)
turn the key over means nothing to me.?? sorry, it doent/
try saying what postion? cranking? or just keyon.
now some more EFI rules.
The EFI (some) do not activate the pump relay until cranking.
some do just key on for 3 seconds, read the FSM, its free.
need a link to the free manual? read the ECU logic on that.?
and prime has a special meaning, it means purge air,
its not for fuel. some system send a fast prime pulse. to clear air from the pressure lines, this plus does not inject.
that is how EFI works,

the flow
1: key on, ECU sends prime pulse, (air purge)
2: some ecu, run pump for 3 seconds, and pressure hits 35psi? RTM.
3: all ecu activate pump cranking and running.
4: now check pressure. !" 36 psi FSM stated spec"
5: now crank, if the ECU sees no spark errors, it injects
6: if the ECU sees WOT. it stops injection to clear a flood, cranking.
those rules cover most ECU made.

honda this year has a special feature called,
Fuel Cut-Off Control'
if this messes up, it i can cut fuel
does this help?
even better is this site, (has all the facts..)
http://honda-tech.com/showthread.php?t=810101

Oct 07, 2013 | 1992 Honda Civic

1 Answer

Need Complete Schematics. Can't find online and don't want to buy factory shop manual for $150. Know where I can get a printable download? Thanks.


depending on the car, there are lots of diagrams at autozone.com. It's free to get an account, but I don't guarantee they have what you need. If you tell me car model/year/engine, I can check and let you know.

Dec 11, 2010 | Chevrolet C1500 Cars & Trucks

1 Answer

1995 Jeep YJ with a new engine. No power going to coils.


sounds like you are working on a car FSM free?
why do that?
95 YJ
early wrangler
i have 95 yj fsm and 93, the 93-95 are a year class range.
very simular.
here is a free 93 fsm with full schematics in chapter 8w
wiring chapter, clik
pdf 76 is page YJ 19 actual
and as you can see its cave man simple 2 wires.
minus to ECU ignitor driver. transistor (inside ecu)
and
+ goes to
a142 sheet 5 (pdf 62)

im not sure what part A<B<C is, a fuseable link, is my guess
and is blown. but that be a bingo spot for sure.
the full manual is there.
see spark chapter.
http://www.jeep4x4center.com/knowledge-base/index.htm?utm_source=cj#service

posted over 100 times, this link, its not new.

Feb 13, 2010 | 1995 Jeep Wrangler

2 Answers

99 ford f250 truck 5.4 need vacuum line schematics


Try ebaymotors they have repair manuals on cd that are inexpensive and have electrical schematics as well as vacuum diagrams. $15.00 - $20.00

Aug 06, 2009 | 1999 Ford F250 Regular Cab

1 Answer

Ground short causing check light to stay on


Hey check this site out , manuals online , you can download a lot for free, should have something on wiring schematics. Hope this helps you out.

Jul 27, 2009 | 1999 Ford Escort

3 Answers

ECU location


If it is in there check also on the drivers side of the engine block. Often , on new models the ECU is mounted behind the fuel filter housing.
Another way to find the ECU is following the wiring that are coming from the fuse box, on one way they go toward the device, on the other they go to the car computer

Here is the ECU:
1f4bce1.jpg

If you need replacement you can buy here :
Dodge Sprinter Auto Parts & More
Here you can also buy the Chilton repair manual with illustrations for all car parts and all step-by-step iillustrated procedures, this is a must if you want to DIY your vehicle.
Dodge Sprinter Repair Manual - Partstrain.com
Here is a cheaper manual, with immediate download, I do not know if it is good: MANUAL, SERVICE - Downloads

I see If I can find a precise schematic, or a picture, in case I will post it tomorrow, as now I am going offline.

Sep 07, 2008 | 2006 Dodge Sprinter

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