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ECM-26B0 Injector Power Signal too high

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Old May 20th, 2019, 21:25   #11
seanc
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I think if you look at where Joe started and got to, he ended up replacing and splicing the new connectors on and had the same problem. Then pulled the loom cover off until he got further down and found those damaged wires. Wouldn't hurt for you to do the same in case it might be that simple.
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Old May 22nd, 2019, 10:45   #12
Joe H
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Quote:
Originally Posted by seanc View Post
I think if you look at where Joe started and got to, he ended up replacing and splicing the new connectors on and had the same problem. Then pulled the loom cover off until he got further down and found those damaged wires. Wouldn't hurt for you to do the same in case it might be that simple.
Yes, in my case the wiring damage was obvious once the covering was stripped off. It is easy enough to remove all along it's length to the ECU so worth doing that. (getting it covered up neatly again is more difficult :-) )
In my case that almost solved the problem, the last part was getting the replacement (used) injector coded by Volvo.

Hope you get it sorted, it is very frustrating with an intermittent problem like yours.

Joe
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Old May 22nd, 2019, 20:10   #13
guido
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Thanks for the reply. I've since removed the connector block from the ECU and cleaned the contacts with contact cleaner spray. While I was there I measured the resistance between the ECU connector block pins the injector plug pins and both read 0.15ohms which was the same reading as the plug on injector 2 so I assume that's normal? I did find a point where the main harness had been rubbing against the edge of the engine block, no wires are broken but one or two look a bit stretched so I'll investigate that further and as you suggested I'll check the whole length of the wiring harness.

At the moment it seemd to be pointing towards the injector though. I added some injector cleaner to the last tank of fuel (I know this isn't recommended and most of them are snake oil but I thought it was worth a try) and it may be coincidence but the issue seems to be a bit less frequent and the DTC code isn't being generated as often. On yesterday's commute I gave it a good revving once it had warmed up and after that it behaved itself for the rest of the journey. I'm inclined to leave it for a bit to see if it sorts itself out, if not I'll replace the injector.

Did having the injector coded make any noticeable difference? I was quoted about 130 from a local dealer just to do the coding, I've read other posts where people have just swapped them over with no apparent issues.
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Old May 23rd, 2019, 18:22   #14
Devonsteve
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I had something similar on my bmw 3 series 3.0 diesel a few years back. I used bmws software on my laptop to diagnose a misfire. Initially it said injector 5 not firing properly. So my first thought was faulty injector. I used the software more and dug deeper and got more info. The final message was resistance too high. When I checked the injection harness, the wires were all completely stiff. A new loom was only 45 so replaced it and it cured the problem and ran better than ever.
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Old May 24th, 2019, 07:25   #15
KBB
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Originally Posted by guido View Post
Thanks for the reply. I've since removed the connector block from the ECU and cleaned the contacts with contact cleaner spray. While I was there I measured the resistance between the ECU connector block pins the injector plug pins and both read 0.15ohms which was the same reading as the plug on injector 2 so I assume that's normal?.
I'm afraid that your resistance test proves only one thing and that it has not got an open circuit. Injector circuits five with 120v at around 20 amps. If your harness was held together by only one single strand it would show a very low and acceptable resistance reading but could that one remaining strand handle 120v at 20 amps?

Best test on injector circuits is with an oscilloscope measuring voltage at the ECU and at the injector connector, that will show any loaded circuit dynamic voltage drop along with inductive current clamp to establish the amps flowing as low amps means circuit resistance if supply voltage is correct.
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