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Diesel Engines A forum dedicated to diesel engines fitted to Volvo cars. See the first post in this forum for a list of the diesel engines. |
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ECM-26B0 Injector Power Signal too highViews : 10955 Replies : 24Users Viewing This Thread : |
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Apr 21st, 2017, 13:18 | #1 |
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ECM-26B0 Injector Power Signal too high
Guys - I need some help in fault finding this problem on cyl 5.
The previous owner had a misfire ( 2006 XC70 D5 185 ). The dealer spent some time investigating; cleaned the injector, checked connections, finally thought the ECM was faulty. The PO got an ECM cloned and fitted and it made no difference. I have changed the injector itself and done a leakback test which is OK, so is fuel correction. No other codes in VIDA and it passed the MOT emissions with no problem. The misfire seems to be there only when cold, seems fine when hot. There IS a problem with the DPF clogging but that may be caused by this problem, not the other way around? The swirl mechanism was broken so I have replaced that and cleaned the EGR. VIDA only says possible source is 'Internal fault in ECM' but as I say the clone is the same. Where do I go next? Cheers Joe |
Apr 21st, 2017, 13:35 | #2 | |
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Quote:
first item should have been connector , second the injector and third ECU ( ECU is always very last on the list ) Two of these 30765319 you will need a very thin tool/screwdriver to release the terminals from the housing .
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Apr 21st, 2017, 14:04 | #3 | |
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What is the logic to a 'Signal too high' message being caused by a dodgy connector, which I normally associate with low voltage being passed. Is the ECM having to pump out more electrons to overcome high resistance? Cheers Joe Last edited by Joe H; Apr 21st, 2017 at 14:10. |
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Apr 21st, 2017, 16:39 | #4 |
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signal too high means the injector is showing high resistance to the ECU so less load therefore higher signal voltage than if the injector was getting it's full quota of power . You might be able to reproduce the fault by wiggling the connector . A lot of vibration there on a diesel .
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Apr 23rd, 2017, 09:23 | #5 |
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I had similar misfire / poor running issues on my 2007 185 D5 xc90 recently, also related to cylinder 5. See this thread: http://www.volvoforums.org.uk/showthread.php?t=266079
I had already tried to check wire & terminal resistances and all appeared fine, it only showed up as a fault on mine after everything was thoroughly warmed up. Totally resolved now after replacing the terminals with part number 30765321, listed as a 'repair terminal' and which contains 2 terminals pre-crimped to lengths of wire. About £8.40 from the dealer. I used a safety pin to release the old terminals from the plug. Could be that cylinder 5 is a bit susceptible as the loom is tight in this area - I left some extra length on it when I soldered in the repair terminals. |
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May 25th, 2017, 09:42 | #6 | |
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Quote:
So it now has : Replacement injector Replacement connector Cloned ECU (by PO) With no change, so the next logical thing to check is the wiring from ECU to injector. Can anyone point me at wiring diagrams and pin outs in Vida? Must be in there somewhere but I can't see them. Thanks Joe |
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May 25th, 2017, 13:18 | #7 |
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While not disagreeing that wiring is a likely issue, could it be a burnt valve seat ? Back in the day on more agricultural petrol engines, I would check by listening to an open carb when cranking over - or you could do a compression test.
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May 25th, 2017, 14:19 | #8 | |
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There may still be a mechanical fault when I get rid of the electrical ones.... Cheers Joe |
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May 25th, 2017, 15:00 | #9 |
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Spend a few minutes looking at how difficult it will be to get into the loom and when I removed the tape around the very first junction and pulled the wires out this is what I found.....hopefully an easier fix than I expected !
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