C25 XE into MK2 GTE Electrical issues

[GTE24v]

Engine all in and plumbed up yesterday. went to turn it over and the after market immobiliser had killed itself.

Spent this morning cutting it out.

Then attempted to wire it up after alot of people have told me its easy. Just put ECU to live (red wire ring conector on it ) negative (black wire ring connector) IGN Live solid black wire. Then fuel pump (red / blue) on mine its wired under passanger door sill protector this was best option as thats where it had been cut for alarm..

No spark or pump C25 was running before it was taken out and so was the old 8v. any help appreciated

Any one any help please!! Iv googled it for last few hours but just cant find a how 2 ill do one when iv worked it out lol

[Frisco]

MK2CAV.COM - Home of the MK2 Cavalier - HOW TO: XE wiring

That covers the connections needed to get a c25 running

[GTE24v]

Done all that mate and no luck. No power coming from ECU to pump etc no spark either

[Frisco]

Thats all there is to wiring it. Try another fuel pump relay for starters.
How are you checking the power at the ecu?

[GTE24v]

i think mate im out of luck when i had calibra stripped it was assumed by garage it was the non immobilised ECu but iv just looked at ECU and it is HE code which from my googerling i think its immobilsed. which will be a pig as iv scrapped calibra

[Frisco]

Yeah HE is immobilised, the ecu should still get power though but the eml will flash constantly.

You need either a matching HE ecu key and transponder or a PN ecu

[GTE24v]

Trying to sort it now mate.
Think problem has been some one has plugged the GTE Ecu in not sure if this was by accident....... so thats probably why iv had no luck ALL DAY. Just not happy lol

[vectra640]

I didn't think a GTE ecu would fit the 25XE plug?

[GTE24v]

ill check now lol

[GTE24v]

[vectra640]

I stand corrected sorry

[vectra640]

Having a VECTRA x25xe would make me think it won't fit cos nothing apart from vectras had my type of ecu whereas the omegas cavs and calibras shared the same plug pattern

[GTE24v]

Mate genuinly im that confused its not true.
Googerling as much as i can the Cover says ECO TEC (black top ) where as the pre 1995 ones are red tops (non immobilised) just cant work out if its classed as a X25XE or a C25 XE

[Frisco]

The plastic cover makes no difference at all nor does it saying ecotec on it. If its originally out of a calibra it will be a c25xe.

Does it look like this?


HE ecu is immobilised and needs the key and transponder to work
PN ecu is non immobilised (you can just plug a PN into the later loom)

[GTE24v]

yes mate thats exactly what it looks like except for that is alot prettier at moment lol. If and i dont think i can.. get a PN ecu will itclip straight in and work? Also is there any guides on wiring the Transponder in i can get a ECU Transponer and Chip of MCD vaux

[vectra640]

Is the transponder not matched to the ECU, I would assume you need chip, transponder and ECU

[vectra640]

Will dig through my garage, I'm sure I had a PN ecu in there amongst the others

[bucky]

speak to Mark at MCD. hes done plenty and knows his stuff.
much easier than 10 people replying to a thread with conflicting/in complete info.