Omega Owners Forum
Omega Help Area => Omega General Help => Topic started by: DrAndyB on 25 May 2017, 21:47:27
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Come to get in the car to come home this evening and speedo has stopped :'(
Fuel and temp guage OK, cluster lights OK, and trip computer OK but:
- No Speedo
- No Odometer or Trip counters
- No Cruise control
- No Distance related functions in trip computer
Any thoughts ?
I don't have any warning lights (TC or ABS). Just Speedo not move when drive off. When car is started you see needle flicker slightly (as I think it has always done).
Car is a 2.5CDX V5 Manual (Mini Face Lift).
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Sounds like the speed signal out put from the ecu has a break in it. Which is probably the only ABS fault which won't raise a code ::)
This is the Blue/Red wire which runs everywhere... radio/sunroof/speedo/cruise/suspension level control/xenon ecu/engine ecu...
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Sounds like the speed signal out put from the ecu has a break in it. Which is probably the only ABS fault which won't raise a code ::)
This is the Blue/Red wire which runs everywhere... radio/sunroof/speedo/cruise/suspension level control/xenon ecu/engine ecu...
Sounds like a nightmare. Where would one start ? :-\
I was going to make sure Speedo was seated right by popping it out and in and go from there. It has been warm, so it maybe that ? I do hope this is not the start of the end for my poor baby :'(. 62k on the clock she is too young to hang her boots up :o
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I would start by checking the continuity from the abs ecu to the engine and cruise ecu plugs and between the engine and cruise ecu plugs.
The second will tell you if the wiring is intact to the speedo as this spurs off the cruise feed (or vice versa)
If both of these check out as unbroken, then your fault is most likely the abs ecu. It is a rare failure mode, so don't be disheartened by it ;)
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I would start by checking the continuity from the abs ecu to the engine and cruise ecu plugs and between the engine and cruise ecu plugs.
The second will tell you if the wiring is intact to the speedo as this spurs off the cruise feed (or vice versa)
If both of these check out as unbroken, then your fault is most likely the abs ecu. It is a rare failure mode, so don't be disheartened by it ;)
Ok will do. Where are the ABS, Engine and Cruse ECU's located ? And are they ok to unplug ?
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Abs to rear of power steering reservoir, engine ecu in triangular fuse box, and cruise ecu is unit with short cable to throttle body.
Only need to test the blue wire with the red tracer. :y
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Abs to rear of power steering reservoir, engine ecu in triangular fuse box, and cruise ecu is unit with short cable to throttle body.
Only need to test the blue wire with the red tracer. :y
Cheers. Will check over weekend. I am hoping it was just the sun and heat just enough for one of them connections to be iffy. They have remained plugged in and not touched since car came out of factory ::)
Fingers crossed. Will report back.
Thanks.
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It's also possible this signal has shorted to ground somewhere so might be worth checking for that.
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It's also possible this signal has shorted to ground somewhere so might be worth checking for that.
Continuity from any of the three plugs above to battery negative will test this :y
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Abs to rear of power steering reservoir, engine ecu in triangular fuse box, and cruise ecu is unit with short cable to throttle body.
Only need to test the blue wire with the red tracer. :y
Just to check, assume its OK to unplug the ECU. Key it not in the car !
The ABS and Cruise plugs look a pain to access :'(
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Disconnect the battery if in doubt, but it will be fine. Just don't turn the key past 0 ;)
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Sounds like the speed signal out put from the ecu has a break in it. Which is probably the only ABS fault which won't raise a code ::)
This is the Blue/Red wire which runs everywhere... radio/sunroof/speedo/cruise/suspension level control/xenon ecu/engine ecu...
Sounds like a nightmare. Where would one start ? :-\
I was going to make sure Speedo was seated right by popping it out and in and go from there. It has been warm, so it maybe that ? I do hope this is not the start of the end for my poor baby :'(. 62k on the clock she is too young to hang her boots up :o
I have only had that happen to me once after taking out the dash unit for maintenance. I had not seated it in correctly, so once I had done that all was ok.
Your comment about warm weather could be a clue; yes things expand when they get hot, so it is possible the unit has moved just off away from its connection. ;)
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That would only knock out the speedo and trip ;)
Cruise and fuel computer also not working suggests a more fundamental issue...
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Disconnect the battery if in doubt, but it will be fine. Just don't turn the key past 0 ;)
OK, so I disconnected battery to be sure. I have NO Continuity from Pin 9 on the ECU Plug to the Blue with Red Tracer wire on the Cruise control Plug. Pin 9 seems to be the one from the ECU (according to the wiring diagram) but I checked all the ECU pins and none ring through to the Cruise wire plug.
I've attached a few pics.
I've not checked ECU Plug to ABS unit plug yet, is it the rectangular plug on the back of the ABS Unit???? (Which looks a pig to get at ! - 2nd to last pic) or can access any wires in the other round looking connectors revealed when I took battery out ? (last pic ?)
Pin 9 ECU
(http://i1189.photobucket.com/albums/z436/andybeddoes/IMG_20170527_110718.jpg)
BLRT wire on Cruise unit
(http://i1189.photobucket.com/albums/z436/andybeddoes/IMG_20170527_110739.jpg)
Diagram
(http://i1189.photobucket.com/albums/z436/andybeddoes/2cada102-1054-48bb-a638-fb05e7726298.jpg)
ABS Plug ?
(http://i1189.photobucket.com/albums/z436/andybeddoes/IMG_20170527_105356.jpg)
Any use ?
(http://i1189.photobucket.com/albums/z436/andybeddoes/IMG_20170527_105305.jpg)
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OK, so I have continuity from ECU Pin 9 to the BLRT Wire in the more accessible plug !! (I assume this is Plug X3 in the Diagram).
(http://i1189.photobucket.com/albums/z436/andybeddoes/IMG_20170527_120738.jpg)
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It is. You have confirmed that the length of wire between plug and ecu is sound ;)
You need to check the opposite pin in the plug still attached to the battery tray and the cruise plug :y
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Ok, no continuity from plug still on battery tray to cruise :'(
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Ok, no continuity from plug still on battery tray to cruise :'(
Ok, time to get dismantling...
Passenger kick panel out, also sill trim for access... Only a few screws, so not the end of the world... Behind is a pair of large multiplugs, relevant one should be noted on the diagram. Check continuity from round socket to this plug and also from this plug to cruise and report back ;)
If easier first, pull radio and check for continuity between radio plug and battery socket and also radio and cruise.
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Ok, no continuity from plug still on battery tray to cruise :'(
Ok, time to get dismantling...
Passenger kick panel out, also sill trim for access... Only a few screws, so not the end of the world... Behind is a pair of large multiplugs, relevant one should be noted on the diagram. Check continuity from round socket to this plug and also from this plug to cruise and report back ;)
If easier first, pull radio and check for continuity between radio plug and battery socket and also radio and cruise.
Cheers. I shall tackle again tomorrow. Thanks very much for your help so far. I hope your about tomorrow :y
Hopefully i can get to the bottom of it. Is there a knack to removing the kick panel - it's never been off :D
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Just taken her for a spin and:
- Radio Speed Auto Volume I don't think works - I dont know what speed I was doing - LOL - But I wasn't hangin about !
- ABS Definitely works ;D
- Traction control Definitely works - as the 2 small black lines out of my Garage proove before the orange TC light flicked on ;D
Will reconvene tomorrow and hopefully the culprit is behind the passenger kick panel (It was Passenger and not Drivers ?).
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No worries. The more points you can check between, the better isolated the culprit. My money is sadly on the Abs ecu, but it's a very rare failure mode, and prudence dictates ruling out the wiring first :y
Ideally you need the Abs plug off in order to rule out that section of loom as well... Access improves if you unstrap the power steering reservoir and hoik it to one side ;)
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Is the ABS ECU inside the ABS unit where the plug and brake pipes are ?
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Yup. Stands to reason that if the wire is intact to the cruise from there, then the problem lies within the ecu. Equally if the wiring is NOT intact, then you'll need to establish where it is broken/damaged ;)
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No worries. The more points you can check between, the better isolated the culprit. My money is sadly on the Abs ecu, but it's a very rare failure mode, and prudence dictates ruling out the wiring first :y
Ideally you need the Abs plug off in order to rule out that section of loom as well... Access improves if you unstrap the power steering reservoir and hoik it to one side ;)
Are there any clips on the ABS Plug to push, pull, squeeze or swear at to get it off as I am sure there is Knack :y
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Hopefully someone else can answer that as I have never unplugged one :-[
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You should see a purple section sticking out of the right hand side of the plug.this slides out sideways and raises the plug off its pins. Just lifts off then
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You should see a purple section sticking out of the right hand side of the plug.this slides out sideways and raises the plug off its pins. Just lifts off then
Makes sense :y
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I thought that the pulses originated in the ABS ECU, & then fed them around using the red/blue wire?
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You should see a purple section sticking out of the right hand side of the plug.this slides out sideways and raises the plug off its pins. Just lifts off then
Pic Courtesy of another OOF'er - Ta :y
(http://i1189.photobucket.com/albums/z436/andybeddoes/ABS.jpg)
Fingers crossed tomorrow will be a better day and I can find the Fault :'( I'll be installing a new wire at this rate from the main plug to Cruise Control :D
To top it all, the Hot Water boiler is on the blink, fault code = 'New PCB' :'(
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I hope you will be putting a wire in too cos replacing the abs Ecu is a pain in the arxx !
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I hope you will be putting a wire in too cos replacing the abs Ecu is a pain in the arxx !
;D
Fingers crossed. It all happened in the sun then car was parked :D Hopefully as Doctor Gollum has indicated there are some connectors passenger footwell so its hopefully one of them.
I dont want this to be the reason I have to get rig of the old girl :'( She only has 62k on clock :D :D :D :D
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I thought that the pulses originated in the ABS ECU, & then fed them around using the red/blue wire?
This is so... Need to establish if it the loom or ecu... Loom is easier to test at home ;)
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if you need any parts to try for elimination purposes feel free to come on over to Wallasey
John :y
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If no continuity between main loom plugs (by battery) and cruise, that would suggest loom issue, not ABS ECU?
Or have a missed something?
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If no continuity between main loom plugs (by battery) and cruise, that would suggest loom issue, not ABS ECU?
Or have a missed something?
That's my conclusion too.
I have no continuity from the bottom of the RH round plug by the battery tray (as in my pics) to the Cruise contol plug / unit (both BLRT wire.) I DO have continuity from the pin on the ECU (pin 9) to the top of the round plug (the BLRT wire) so it's connected that short distance at least :y
Hopefully I can test the continuity to the plugs behind passenger kick panel and see where we go as I believe from word of earlier wisdom there are some connectors there where I expect it then should go onto the radio/Speedo and cruise plug so I hope it's from down in the kick panel is the issue.
Fingers crossed and hopefully I can report better news tomorrow. :y
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If no continuity between main loom plugs (by battery) and cruise, that would suggest loom issue, not ABS ECU?
Or have a missed something?
It would indeed. But as yet the loom between the ecu and said round plug remains untested. Basically the break, if indeed the cause, could be anywhere between the round plug and the cruise. Radio is a convenient mid point. Continuity here to cruise would suggest the problem is literally to the left of the car. Kick panel plug to radio and sunroof would then narrow it down to the stretch between kick panel and abs ecu/round plug. This would be relatively straightforward to repair by running a fresh wire between the kick panel and the Abs ecu. That the TC works suggests that the engine ecu is seeing a signal... A good sign if small consolation ;)
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If no continuity between main loom plugs (by battery) and cruise, that would suggest loom issue, not ABS ECU?
Or have a missed something?
It would indeed. But as yet the loom between the ecu and said round plug remains untested. Basically the break, if indeed the cause, could be anywhere between the round plug and the cruise. Radio is a convenient mid point. Continuity here to cruise would suggest the problem is literally to the left of the car. Kick panel plug to radio and sunroof would then narrow it down to the stretch between kick panel and abs ecu/round plug. This would be relatively straightforward to repair by running a fresh wire between the kick panel and the Abs ecu. That the TC works suggests that the engine ecu is seeing a signal... A good sign if small consolation ;)
And most importantly that the signal is actually being generated - ECU should be ok