Volvo Community Forum. The Forums of the Volvo Owners Club

Forum Rules Volvo Owners Club About VOC Volvo Gallery Links Volvo History Volvo Press
Go Back   Volvo Owners Club Forum > "Technical Topics" > Diesel Engines

Notices

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.

Information
  • VOC Members: There is no login facility using your VOC membership number or the details from page 3 of the club magazine. You need to register in the normal way
  • AOL Customers: Make sure you check the 'Remember me' check box otherwise the AOL system may log you out during the session. This is a known issue with AOL.
  • AOL, Yahoo and Plus.net users. Forum owners such as us are finding that AOL, Yahoo and Plus.net are blocking a lot of email generated from forums. This may mean your registration activation and other emails will not get to you, or they may appear in your spam mailbox

Thread Informations

ECM-26B0 Injector Power Signal too high

Views : 9088

Replies : 23

Users Viewing This Thread :  

Reply
 
Thread Tools Display Modes
Old Apr 21st, 2017, 14:18   #1
Joe H
Senior Member
 

Last Online: Yesterday 21:44
Join Date: Dec 2002
Location: London
Default 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
Joe H is offline   Reply With Quote
Old Apr 21st, 2017, 14:35   #2
Clan
Experienced Member
 
Clan's Avatar
 

Last Online: Today 14:09
Join Date: Jun 2007
Location: L/H side
Default

Quote:
Originally Posted by Joe H View Post
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
you need to fit a new Loom connector to the injector , You have started at the wrong end of the chain ...
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 .
__________________
My comments are only based on my opinions and vast experience .
Clan is offline   Reply With Quote
Old Apr 21st, 2017, 15:04   #3
Joe H
Senior Member
 

Last Online: Yesterday 21:44
Join Date: Dec 2002
Location: London
Default

Quote:
Originally Posted by Clan View Post
you need to fit a new Loom connector to the injector , You have started at the wrong end of the chain ...
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 .
Great, thanks, Clan.
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 15:10.
Joe H is offline   Reply With Quote
Old Apr 21st, 2017, 17:39   #4
Clan
Experienced Member
 
Clan's Avatar
 

Last Online: Today 14:09
Join Date: Jun 2007
Location: L/H side
Default

Quote:
Originally Posted by Joe H View Post
Great, thanks, Clan.
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
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 .
__________________
My comments are only based on my opinions and vast experience .
Clan is offline   Reply With Quote
The Following User Says Thank You to Clan For This Useful Post:
Old Apr 23rd, 2017, 10:23   #5
Ade2015
Junior Member
 

Last Online: Mar 12th, 2024 20:51
Join Date: Jun 2015
Location: Leeds
Default

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.
Attached Images
File Type: jpg IMG_1879.jpg (117.2 KB, 211 views)
File Type: jpg IMG_1885.jpg (346.7 KB, 196 views)
File Type: jpg IMG_1886.jpg (257.8 KB, 195 views)
Ade2015 is offline   Reply With Quote
The Following User Says Thank You to Ade2015 For This Useful Post:
Old May 25th, 2017, 10:42   #6
Joe H
Senior Member
 

Last Online: Yesterday 21:44
Join Date: Dec 2002
Location: London
Default

Quote:
Originally Posted by Clan View Post
you need to fit a new Loom connector to the injector , You have started at the wrong end of the chain ...
first item should have been connector , second the injector and third ECU ( ECU is always very last on the list ) .
Unfortunately the replacement connector made no difference, Clan.
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
Joe H is offline   Reply With Quote
Old May 25th, 2017, 14:18   #7
poiuytre111
Member
 

Last Online: Apr 15th, 2020 17:32
Join Date: Mar 2017
Location: Amersham
Default

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.
poiuytre111 is offline   Reply With Quote
Old May 25th, 2017, 15:19   #8
Joe H
Senior Member
 

Last Online: Yesterday 21:44
Join Date: Dec 2002
Location: London
Default

Quote:
Originally Posted by poiuytre111 View Post
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.
I don't *think* that would give this specific code. In fact my original 'old school' thinking was the same as yours and my first step was to do a compression test, but I struggled to find a tester with a small enough adapter for the 185 (which I think is a lot smaller than the 163?). Then I got diverted by Vida being able to do a pseudo-compression test, which showed no problem.
There may still be a mechanical fault when I get rid of the electrical ones....
Cheers
Joe
Joe H is offline   Reply With Quote
Old May 25th, 2017, 16:00   #9
Joe H
Senior Member
 

Last Online: Yesterday 21:44
Join Date: Dec 2002
Location: London
Default

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 !
Attached Images
File Type: jpg rsz_xc70_injector_wiring.jpg (108.6 KB, 252 views)
Joe H is offline   Reply With Quote
The Following User Says Thank You to Joe H For This Useful Post:
Old May 20th, 2019, 19:52   #10
guido
New Member
 

Last Online: Oct 25th, 2020 08:08
Join Date: Jul 2011
Location: Manchester
Default

I realise this is an old thread but just wanted to check if this was ever resolved? I'm getting error code ECM-2670 on a 2011 XC90 D5 (Injector power stage, cyl 1 - Signal too high). After an initial attempt to clean the old terminals I've replaced them (in injector 1). This has not resolved the issue but it is now intermittent.

I would like to completely rule out wiring before going down the injector replacement route.

(Long-winded background story below)
I've been trying to diagnose a slightly rough idle (causing intermittent steering wheel vibrations strong enough to make the keys jingle at times) After the first attempt to clean the old terminals it ran smoothly for a few glorious minutes and acceleration and power delivery was smoother...then whatever the problem is returned and it went rough again. After replacing the terminals it's now random, on my 40min commute I'll feel it change several times and the error code will come back (I have an ebay VIDA/Dice rig and clear the error code each time).

One other point of note is after spending a fair amount of time trouble-shooting this issue and not seeing any error codes at all in VIDA I bit the bullet and took it to a local Indie Volvo specialist and paid for a full CAN software update. It was only after the software update that this error code appeared. The mechanic took the car for a test drive but typically it was behaving itself and he said it felt and drove like a normal XC90.

It's run like this since I bought it 2 months ago and I would have believed him if I hadn't had the brief glimpses of what it should REALLY feel like. I've split the injector wiring loom about one third of the way along when I changed the terminals for injector one, the inner wire casing are slightly browned from the heat but no obvious damage. Any help appreciated :-)
guido is offline   Reply With Quote
Reply


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT +1. The time now is 19:31.


Powered by vBulletin
Copyright ©2000 - 2024, Jelsoft Enterprises Ltd.