discool
Well-Known Member
That pic was of my 1997 disco, with all the engine bay looms disappearing through the bulkhead and into the footwell.Yes, i was just clutchig at straws with that as i dont have anything pre-95
JDZ2
Member
OK, been out there cleaning earth terminals. Maybe a waste of time but I feel better for doing it.
I turned power off removed the plug to the ecu. Then dismantled ecu plug body to reveal wiring. Then reconnected power & tested with ignition on.
There is a group of black wires together. Voltage between them & 15 (brown) is 11.56
Voltage between them & 19 (white/red) is 11.35
I turned power off removed the plug to the ecu. Then dismantled ecu plug body to reveal wiring. Then reconnected power & tested with ignition on.
There is a group of black wires together. Voltage between them & 15 (brown) is 11.56
Voltage between them & 19 (white/red) is 11.35
JDZ2
Member
Here is a picture of the ecu..
sierrafery
Well-Known Member
Was that with plug connected to ECU or not? the battery voltage directly on the battery is also below 12V?
sierrafery
Well-Known Member
Then the ECU is very suspect, though you should measure with ECU connected too just to be 100% sure that the voltage doesnt drop due to a bad contact which is quite unlikely but possible. Good luck, at this point i can't help you more.
JDZ2
Member
Thanks for your help up to this point. I
I'm keen to understand the readings: which part of the readings make you think the ecu is very suspect?...& what should the readings be?
sierrafery
Well-Known Member
It's suspect cos it gets the necessary feed but it doesnt do it's job to trigger the relays and injectors, unless it's a wiring issue... it's explained in post #73
JDZ2
Member
Aah OK, thanks. So the power to it is OK, well that's something I guess.
I will get another ecu if I can then & try it. Cheers.
discool
Well-Known Member
Not to sad, if your battery
Not to sad a voltage drop if you battery is reading 11.60v + - depending how accurate your meter is, but is not that important in the scheme of things, as there is voltage available.
JDZ2
Member
Well, an update:
I sent the ecu to that company you put me on to. They just called to say that it is working as it should, no problem at all.
So, the mystery continues! On it's return, any pointers as to what I should try / test next?
sierrafery
Well-Known Member
I'm sorry that your saga continues but at least you know the ECU is OK. As i said in previous posts this kind of behaviour is specific for immobilised ECU but unfortunately i dont know how the immobiliser works on so early modells. Is the key fob working ?
Check voltage on the ECU plug while it's connected and ign. on across pin 19 positive(white/red) and pin 12 negative(blue/red)
Check voltage on the ECU plug while it's connected and ign. on across pin 19 positive(white/red) and pin 12 negative(blue/red)
JDZ2
Member
OK, thanks I will try that when the ecu arrives back. Yes, the key fob works OK, I only have the one but it works.
JDZ2
Member
SHE'S FINALLY RUNNING & SOUNDING SO SWEET
Firstly, my thanks to sierraferry, discool & the others who have taken the time & trouble to provide advice & help with trying to solve the problem.
The great news is a have just taken her for a first drive ( this is my first ever 4x4 ) & she drives really lovely, I am delighted.
So, the only issue is I don't know what I did to solve it! After getting the ecu back, putting back in, I decided to go through all the wiring again, took the loom apart, traced every wire I could & where I could cleaned up any dodgy, slightly discoloured terminal etc. I didn't find anything I can say was conclusive but I connected it all back up, secured the wiring, connected the recharged battery which is crap ( have ordered a new one ) & she fired up on the first turn....I can't tell you how pleased I am. I can now spend the next 12 weeks or whatever it is during this "lock down" cleaning her up to the standard I am used to......Stay well everyone & to those NHS workers on the forum, a big THANK YOU.
Firstly, my thanks to sierraferry, discool & the others who have taken the time & trouble to provide advice & help with trying to solve the problem.
The great news is a have just taken her for a first drive ( this is my first ever 4x4 ) & she drives really lovely, I am delighted.
So, the only issue is I don't know what I did to solve it! After getting the ecu back, putting back in, I decided to go through all the wiring again, took the loom apart, traced every wire I could & where I could cleaned up any dodgy, slightly discoloured terminal etc. I didn't find anything I can say was conclusive but I connected it all back up, secured the wiring, connected the recharged battery which is crap ( have ordered a new one ) & she fired up on the first turn....I can't tell you how pleased I am. I can now spend the next 12 weeks or whatever it is during this "lock down" cleaning her up to the standard I am used to......Stay well everyone & to those NHS workers on the forum, a big THANK YOU.
