850 T5 ECU Location

**ncfooty** · Monday 16th July 2012, 13:31

Hi all, Can anyone tell me the location of the E.C.U on my 1996 Volvo 850 T5 please.
pretty sure it needs replacing all that remains to be done is to test the feeds in and out to confirm but ive had the plenum cover off and theres no E.C.U there....
Any feedback would be greatly appreciated

Cheer
Neil

**oblark** · Monday 16th July 2012, 13:46

Originally Posted by ncfooty

Hi all, Can anyone tell me the location of the E.C.U on my 1996 Volvo 850 T5 please.
pretty sure it needs replacing all that remains to be done is to test the feeds in and out to confirm but ive had the plenum cover off and theres no E.C.U there....
Any feedback would be greatly appreciated

Cheer
Neil

Hi, it`s in here....

**ncfooty** · Monday 16th July 2012, 14:00

Originally Posted by oblark

Hi, it`s in here....

Superb... many thanks for the help....So will have to remove that security bolt....
Are you aware of any problems in replacing the ECU? Will i need the same part number as the old one or are they pretty much standard and interchangeable between most T5's?

**oblark** · Monday 16th July 2012, 14:05

Originally Posted by ncfooty

Superb... many thanks for the help....So will have to remove that security bolt....
Are you aware of any problems in replacing the ECU? Will i need the same part number as the old one or are they pretty much standard and interchangeable between most T5's?

I think only the 96 ECU will fit as the early ones dont have the OBD2 socket.

**Wally Dog** · Monday 16th July 2012, 14:33

I've got an old one from a manual car if you want/need another. Older ones have the diagnostics socket under the bonnet near the fuse box somewhere, wheras newer ones (OBD II) have the socket under the coin holder in front of the gear stick.

Also, is your car manual or auto - as autos have an extra ECU for the auto box in the same location, so you have to change the correct one.

**Jimmie** · Monday 16th July 2012, 18:46

[QUOTE=Wally Dog;524506]I've got an old one from a manual car if you want/need another. Older ones have the diagnostics socket under the bonnet near the fuse box somewhere, wheras newer ones (OBD II) have the socket under the coin holder in front of the gear stick.

QUOTE]

Diagnostic socket beside coin holder from 96 model year N reg.

**p fandango** · Monday 16th July 2012, 18:50

inside the box there are 3 ecu slots moulded into the base, the engine ecu is in the middle slot

**claymore** · Monday 16th July 2012, 18:51

[QUOTE=Jimmie;524638]

Originally Posted by Wally Dog

I've got an old one from a manual car if you want/need another. Older ones have the diagnostics socket under the bonnet near the fuse box somewhere, wheras newer ones (OBD II) have the socket under the coin holder in front of the gear stick.

QUOTE]

Diagnostic socket beside coin holder from 96 model year N reg.

Are you sure about that?

**Wally Dog** · Monday 16th July 2012, 19:12

Yep, I have 2 N reg 855 T5's - one is older type and one is newer type. Older type also has an extra ECU bolted to the right hand turret - something to do with the ABS I think. And the OBD II socket is UNDER, not beside the coin holder.

**oblark** · Monday 16th July 2012, 19:39

Originally Posted by Wally Dog

Yep, I have 2 N reg 855 T5's - one is older type and one is newer type. Older type also has an extra ECU bolted to the right hand turret - something to do with the ABS I think. And the OBD II socket is UNDER, not beside the coin holder.

Check the Bosch numbers

**Jimmie** · Monday 16th July 2012, 19:48

Yes you are correct you remove (lift it out)the coin holder.

**t5 pete** · Monday 16th July 2012, 20:11

Hello what problems are you having to make you thing the ecu need replacing

**ncfooty** · Sunday 22nd July 2012, 10:22

Hi all, many thanks for the help.....the car is a non starter, the engine cranks but wont catch, i changed the coil pack as there is no spark, new coil pack doesnt produce a spark either, checked cam shaft position sensor, no signal from that so replaced that, still no joy, took it to work (Volkswagen dealer) and the techy there says that after probing and testing it can only be the ECU but now we need to get hold of a reliable flow diagram for the inputs e.t.c for the ecu. Ive downloaded one off the net but its not the right one for my car, it says its for a 1996 t5 but its not right....can anyone supply a reliable current flow diagram for my car??

**ncfooty** · Sunday 22nd July 2012, 10:24

Originally Posted by Wally Dog

I've got an old one from a manual car if you want/need another. Older ones have the diagnostics socket under the bonnet near the fuse box somewhere, wheras newer ones (OBD II) have the socket under the coin holder in front of the gear stick.

Also, is your car manual or auto - as autos have an extra ECU for the auto box in the same location, so you have to change the correct one.

Hi, yeah its the newer 'n' reg 1996, the ODB plug is under the coin tray, its an auto....

**woz** · Sunday 22nd July 2012, 16:34

Originally Posted by ncfooty

Hi all, many thanks for the help.....the car is a non starter, the engine cranks but wont catch, i changed the coil pack as there is no spark, new coil pack doesnt produce a spark either, checked cam shaft position sensor, no signal from that so replaced that, still no joy, took it to work (Volkswagen dealer) and the techy there says that after probing and testing it can only be the ECU but now we need to get hold of a reliable flow diagram for the inputs e.t.c for the ecu. Ive downloaded one off the net but its not the right one for my car, it says its for a 1996 t5 but its not right....can anyone supply a reliable current flow diagram for my car??

For £35 I would just go and get the codes read. They will tell you if there is a sensor or wiring fault, or indeed if the ECu has gone AWOL.

You could spend that in replacing perfectly good parts, and how much value would you put on your time?

Woz

**ncfooty** · Tuesday 24th July 2012, 10:30

Originally Posted by woz

For £35 I would just go and get the codes read. They will tell you if there is a sensor or wiring fault, or indeed if the ECu has gone AWOL.

You could spend that in replacing perfectly good parts, and how much value would you put on your time?

Woz

Codes were read, the only fault stored was for the throttle position sensor......

**nobananas** · Tuesday 24th July 2012, 21:23

Check for broken wires going to the relay under the top radiator plastic cover (four wires I think) these are bent back on themselves as they enter the relay plug and rot through. What you are describing (no cam signal, no spark) is exactly what I had when the wiring to that relay rotted through and stranded me in The Lakes !