Swapping out transmission ECU to overcome EP problem??

paulh260260 · 3rd August 2022, 16:55

Guys

I've had an EP problem for a while which comes on as soon as I put in the key however, it goes away with the removal and reinsertion of fuse 4 and the car then drives fine.

Having spent ages and ages trying to find a wiring fault but to no avail I took her in for a T4 session and was told "it could be anything" and it was suggested I try swapping things out to try to isolate the problem.

So based on fuse 4 eliminating EP my first swap out will be the transmission ECU, however before I try this I've a few questions.

1. I have an identical ecu in a donor car so is it possible to swap out, turn the key to II to see if EP has gone.

2. If this works what is the next step, what if anything will need re coding?

Cheers

Paul

BigRuss · 3rd August 2022, 17:56

Yes you can swap the ECU over without issues, best way of finding faults sometimes is to substitute with a known good one.

If it does work you can continue driving on the replacement, there will be a Vin mismatch but that can be sorted on T4.

Note:if you're using someone with a "virtual" T4 they can't do it without making the Autobox ECU unusable, it needs to be a proper one

Russ

paulh260260 · 3rd August 2022, 18:30

Quote:

Originally Posted by BigRuss

Yes you can swap the ECU over without issues, best way of finding faults sometimes is to substitute with a known good one.

If it does work you can continue driving on the replacement, there will be a Vin mismatch but that can be sorted on T4.

Note:if you're using someone with a "virtual" T4 they can't do it without making the Autobox ECU unusable, it needs to be a proper one

Russ

Cheers Russ

If I cannot solve this annoying EP fault I suspect I may be travelling over the border to Yorkshire for your help!!!!

Paul

3rd August 2022, 16:55	#1
paulh260260 Still learning... Gold 04 75 Connie SE 2.5 V6 Petrol, Silver 52 Connie SE 2.5 V6 Petrol, 04 BRG Connie 2.5 V6 Petrol Join Date: Sep 2009 Location: MANCHESTER Posts: 231 Thanks: 129 Thanked 40 Times in 27 Posts	Swapping out transmission ECU to overcome EP problem?? Guys I've had an EP problem for a while which comes on as soon as I put in the key however, it goes away with the removal and reinsertion of fuse 4 and the car then drives fine. Having spent ages and ages trying to find a wiring fault but to no avail I took her in for a T4 session and was told "it could be anything" and it was suggested I try swapping things out to try to isolate the problem. So based on fuse 4 eliminating EP my first swap out will be the transmission ECU, however before I try this I've a few questions. 1. I have an identical ecu in a donor car so is it possible to swap out, turn the key to II to see if EP has gone. 2. If this works what is the next step, what if anything will need re coding? Cheers Paul __________________ Still figuring out where this last nut goes...

3rd August 2022, 17:56	#2
BigRuss Premium Trader 75 CDT Tourer,2.5 Launch Saloon, Omipro MG/Rover (T4) Join Date: Jul 2007 Location: Liversedge, West Yorkshire Posts: 5,405 Thanks: 1,105 Thanked 1,340 Times in 661 Posts	Yes you can swap the ECU over without issues, best way of finding faults sometimes is to substitute with a known good one. If it does work you can continue driving on the replacement, there will be a Vin mismatch but that can be sorted on T4. Note:if you're using someone with a "virtual" T4 they can't do it without making the Autobox ECU unusable, it needs to be a proper one Russ __________________ Replacement Key Service http://https://the75andztclub.co.uk/...d.php?t=244732 Full T4 Testbook diagnostics available. Diesel ECU repair and replacement. Options enabled or disabled as required. Diesel X-Power 135 and 160bhp, Rover 1.8T 150 to 160 MG 160 V6 to 177 upgrades available P.M. for details.