Suspect ECU ?

Rover Bob · 20th February 2023, 13:17

Hi. I have ad a 55 plate 75 diesel manual for around three years which has run perfectly. Last week I went 7 miles to Tesco's with no problem but then wouldn't start again. The AA came out and noticed that there was no sounds from the in tank fuel pump and towed me home. I have made a direct connection to the fuel pump from another battery and it runs fine so I suspected the the ECU could be at fault. The plenam chamber was dry as was the ECU but there are some slight signs of corrosion on the heads of the lower screw heads so maybe in the past there was some damp around. I have taken the cover off the ECU and the inside looks dry. Therefore the question is am I right to suspect the ECU and where can I get it checked and repaired if required. Any help or suggestions would be gratefully received.

BigRuss · 20th February 2023, 13:24

It would be best to get the ECU tested and see if it is that or if the fault lies elsewhere.
I can test it for you if you wish, if it does require repair or replacement then can do this also
Please send me message and will be happy to help.

Russ

Rover Bob · 20th February 2023, 22:52

That's what I thought. Russ I'll PM you tomorrow

tony g · 21st February 2023, 13:47

I had the same problem with my first 75 diesel when i parked as asda years ago, turned out to be the ECU, sent it to the ECU Dr and they repaired it for £125. probably more now though !!!! but if bigruss can sort it all the better

Rover Bob · 27th February 2023, 09:27

Just to close this. BigRuss confirmed the the ECU was faulty and supplied a replacement at a very reasonable cost. Although there were signs of damp I also found that when I had the battery changed recently they had loosened the battery negative lead from the body earth point (the lead was short because at some time the original battery connector had been replaced with an ordinary clamp) but had not done it back up again. I think that there is a good chance that this bad connection could also have contributed the the ECU's demise. All sorted now and back on the road again.

20th February 2023, 13:17	#1
Rover Bob Newbie Rover 75 Saloon Join Date: Jul 2015 Location: Chichester Posts: 3 Thanks: 0 Thanked 0 Times in 0 Posts	Suspect ECU ? Hi. I have ad a 55 plate 75 diesel manual for around three years which has run perfectly. Last week I went 7 miles to Tesco's with no problem but then wouldn't start again. The AA came out and noticed that there was no sounds from the in tank fuel pump and towed me home. I have made a direct connection to the fuel pump from another battery and it runs fine so I suspected the the ECU could be at fault. The plenam chamber was dry as was the ECU but there are some slight signs of corrosion on the heads of the lower screw heads so maybe in the past there was some damp around. I have taken the cover off the ECU and the inside looks dry. Therefore the question is am I right to suspect the ECU and where can I get it checked and repaired if required. Any help or suggestions would be gratefully received.

20th February 2023, 13:24	#2
BigRuss Premium Trader 75 CDT Tourer,2.5 Launch Saloon, Omipro MG/Rover (T4) Join Date: Jul 2007 Location: Liversedge, West Yorkshire Posts: 5,419 Thanks: 1,105 Thanked 1,340 Times in 661 Posts	It would be best to get the ECU tested and see if it is that or if the fault lies elsewhere. I can test it for you if you wish, if it does require repair or replacement then can do this also Please send me message and will be happy to help. 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 "160", Rover 1.8T 150 to 160 MG 160 V6 to 177 upgrades available P.M. for details.

20th February 2023, 22:52	#3
Rover Bob Newbie Rover 75 Saloon Join Date: Jul 2015 Location: Chichester Posts: 3 Thanks: 0 Thanked 0 Times in 0 Posts	That's what I thought. Russ I'll PM you tomorrow

21st February 2023, 13:47	#4
tony g Posted a thing or two MG ZT Join Date: Dec 2006 Location: cumbria Posts: 1,238 Thanks: 8 Thanked 43 Times in 24 Posts	I had the same problem with my first 75 diesel when i parked as asda years ago, turned out to be the ECU, sent it to the ECU Dr and they repaired it for £125. probably more now though !!!! but if bigruss can sort it all the better

27th February 2023, 09:27	#5
Rover Bob Newbie Rover 75 Saloon Join Date: Jul 2015 Location: Chichester Posts: 3 Thanks: 0 Thanked 0 Times in 0 Posts	Just to close this. BigRuss confirmed the the ECU was faulty and supplied a replacement at a very reasonable cost. Although there were signs of damp I also found that when I had the battery changed recently they had loosened the battery negative lead from the body earth point (the lead was short because at some time the original battery connector had been replaced with an ordinary clamp) but had not done it back up again. I think that there is a good chance that this bad connection could also have contributed the the ECU's demise. All sorted now and back on the road again.