R

Redditch

Active Member
i dont really know where to post this but will start here as its a range rover
ive bought a cheap year 2000 4.6 auto P38 it all seems to run and work as its supposed to now i want the engine and box for another project non landrover, ive also bought a non embolized P38 thor ecu as i imagine trying to get this running in an iveco is going to be trouble enough with out the ecu looking for codes from keys or body control units or what ever they normally talk to in their everyday operation,
so what im after is help with the wiring such as a pin out for the ecu or anyone who know their way round this wiring malarky who has run a gems engine out of its natural environment,

thumbnail - 2023-08-11T180246.219.jpg


the ecu seems to have 5 plugs 3 with itty bitty little pins which i would assume to be the engine sensors and links to the dashboard and ode2 port
and the 2 more plugs with bigger pins which im assuming would be a permeant live a switched live an earth and fuel pump relay control etc
if l post up pics of each plug is there anyone who can help me identify what does what ?
thumbnail - 2023-08-14T111324.356.jpg



and this is the ecu thats still in the car
thumbnail - 2023-08-14T111340.604.jpg

im going to call the left hand plug A since thats the way you would read from the left, any clever sole know which wire does what in plug A ?

im planning on leaving the engine and box in the car and getting running on the standalone loom/ecu before i pull it out

thanks Andy
 
2000 is Thor, not GEMS. The key codes are handled by the BECM, I suspect the only thing the engine management system needs is the signal from the BECM that is given once the BECM has matched the code stored in it to the EMS one.
 
Grrrrrr said:
2000 is Thor, not GEMS. The key codes are handled by the BECM, I suspect the only thing the engine management system needs is the signal from the BECM that is given once the BECM has matched the code stored in it to the EMS one.
Click to expand...
I think the ECU uses a rolling code for mobilisation sent from the BECM so some way of producing or bypassing the code will be required.
 
Datatek said:
I think the ECU uses a rolling code for mobilisation sent from the BECM so some way of producing or bypassing the code will be required.
Click to expand...

GEMS does. Not sure about the Thor. I think the Motronic ECU is a bit of a hack conpared to the Lucas system.
 
Datatek said:
I think the ECU uses a rolling code for mobilisation sent from the BECM so some way of producing or bypassing the code will be required.
Click to expand...

Grrrrrr said:
GEMS does. Not sure about the Thor. I think the Motronic ECU is a bit of a hack conpared to the Lucas system.
Click to expand...

The Thor ecu is similar to the diesel in that it’s a fixed number in BECM and ecu that need to match.
The Gems is a differ rolling code.

But as OP has a “free run imbo removed” it doesn’t need the BECM .

and besides he was only asking about pin outs ;) .

J
 
aj1954 said:
Why not a stage 2 4.6 with Weber or Edelbrock carb, of course you would need the front cover off a 3.5!
Click to expand...
i see nothing wrong with carbs i have a 4.6 on su's it works just fine but the world moves on im sure manufactures dident move over to fuel injection because its worse than carbs but if i stay with carbs i learn nothing i did some bedtime reading lastnight and i see the ecu has lots more inputs than i had realized, it knows when you are on a rough road from pin 34 on connector 4 l think it only disables the misfire monitor/logging, pin 18 on connector 3 is more interesting though its an input from the low range switch so it knows when you select low but whats it do with this information ? i could see the merrits in knocking the timing back momentarily to protect the halfshafts when climbing over obstacles but im guessing there, so this is a learning exercise as much as anything
 
To be fair it was a lot simpler for the main dealers too. No more messing about with carbs or points. If it failed you just shove a new board in and chuck the old one.
 
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