You are logged in as a guest. 
  Home Forums Home  Search our Forums Search our Forums    Log in to the Forums Log in to the Forums  register Register on the Forums  

 Forums ->  Motorhomes -> Motorhome Matters
Jump to page : FirstPrevious 1 2 3 4 5 Last
Format:  Go
3.0 comfort-matic gearbox failure
AuthorMessage
userBrambles
Posted: 30 April 2014 12:56 AM
Subject: RE: 3.0 comfort-matic gearbox failure
 


Forum master

Posts: 4157
200020001002525


arjxh56 - 2014-04-29 11:24 PM

OK, figured out the black canister is the starter motor.. (I'm learning!)
I will take the black wire off tomorrow and clean it up and re fit it.. just in case this isn't helping the situation.

I also noticed the gearbox to chassis earth strap sparked when putting it back on? Is this normal.. I assume this is because the tracker, immobiliser etc.. are drawing power even when the keys are out of the ignition?



I do not think cleaning the starter motor earth will make much difference, as the motor works fine.
Yes, normal for main gearbox earth to spark as various things power up again.
What I would do though based on past posts re this strap , is double up the earth strap from gear box to chassis, by this I mean add an extra strap from say the engine block to the chassis main earth point so you reduce the impedance ( resistance) of this connection. This appears to fix the problems often mentioned by Nick.

userarjxh56
Posted: 30 April 2014 1:20 AM
Subject: RE: 3.0 comfort-matic gearbox failure
 


Pops in from time to time

Posts: 105
100


Thanks for the quick reply. .. I assume you mean i have the usual gearbox to chassis earth strap as mentioned, and then attach another new earth strap to the same chassis point as the gearbox one, and then to a random bolt on the engine block somewhere?

Should i also put another one on the alternator as this has been mentioned somewhere before too??
I have also seen someone mention a new earth strap directly from the battery terminals to the chassis point. Should i add this whilst i am at it as well ??

Cheers
userCliveH
Posted: 30 April 2014 6:21 AM
Subject: RE: 3.0 comfort-matic gearbox failure
 
Lord of the posts

Posts: 6068
500010002525


Certainly the "belt and braces" school of thought would suggest this is sensible.

I will bow to others greater expertise in vehicle electrics - but when fitting things like spot lights I always run the earth lead to the battery earth rather than rely on earthing via the chassis.

I appreciate this is not so easy when you have substantial earth straps such as those you are dealing with.

But relying on a chassis earth can be bad news.

Also - how old is the battery? not sure if anyone has covered this??? - we had an intermittent problem on the Discovery with the Alarm and the immobiliser and it was because the battery was not holding its charge.

I mention it because the circumstances were very similar to those you state - i.e. try to restart after a short run - I assumed this was because the battery was "going wobbly" after being charged.

A new battery solved our issues.

userPampam
Posted: 30 April 2014 7:24 AM
Subject: RE: 3.0 comfort-matic gearbox failure
 
Treasured contributor

Posts: 843
50010010010025


Arjkx 56 if you are anywhere near doncaster stoneacre here are a fiat commercial garage who i discovered after our fiasco with our comfortmatic gearbox and the dealership who took TWO MONTHS and still couldnt find the fault in the clutch i only took it to dealership on breakdown lorry because i thought it would be under warranty ....what a joke ! We ended up trading it in and getting a new van with manual gearbox ......it was still on the ramp with gearbox out when we exchanged :in retrospect i would have asked relay to take to stoneacre but hindsight is a marvellous thing we had lost faith in van cos of gearbox anyhow but i would highly recommend the team at stoneacre (fiat commercial) even tho havent a van at all at moment good luck pp:)......... Oh yes the dealership was Brownhills
userBrambles
Posted: 30 April 2014 10:16 AM
Subject: RE: 3.0 comfort-matic gearbox failure
 


Forum master

Posts: 4157
200020001002525


Re engine earth strap from gearbox.

The simplest way is to use a bit of flexible welding cable and have tags with a 6mm hole? added to both ends. The lead should be approx 10 inches long and is added in addition to existing strap from the chassis earth point to another bolt on the gearbox end plate.

Check harnesses where they run past other equipment or flanges. I believe there is one harness whch runs under the headlight and in this area can be damaged...you need to refer back to Nick's posts s he has mentioned. There is also I believe a point on the harness where it is close to the wiper motor mechanism and can get damaged by the wiper mechanism so look for this. Connections to fuses boxes and Engine managemnet sytes can also be prone to damp getting in and corroded contacts so need checking, as well as damaged cables due to so many being in thr same proximity and some get stressed and can break. Treat all cabe cnnections with great care not to cause any damage, it very easy as so much force is needed to manipulate massive bunches of wires that one slightly shorter wire in the group ends up being pulled and damaged.

DO NOT, go adding odd earthing cables willy nilly from various engine items to the chassis or battery zero volts, it could add more problems than it is worth and also be dangerous should main earthing for engine fail for any reason. Even some mechanic, be it yourself or not, disconnects the gearbox strap and trying to start the engine means all the starter motor current goes through your addition added earthing thin lead so it burns out and could go on fire.

The chassis is used as the main earthing/zero volts point not the battery negative terminal. However make sure your battery earth connection is sound as well as all positive connections. Also make sure there are no items connected to the chassis also resting against the engine block gearbox or exhaust which could be adding an additional ground loop. For example a wire strap from exhaust to chassis, or say a heat shield for the exhaust is bent/detatched and resting against something connected to the engine.
usereuroserv
Posted: 30 April 2014 11:35 AM
Subject: RE: 3.0 comfort-matic gearbox failure
 
Epic contributor

Posts: 1685
1000500100252525
Location: Leicester


Hello,

Sorry for the delay. I have just read the updates and it looks like some of our other friends are steering you in the right direction.

I can say with some certainty that your problem is insufficient earthing. You need an additional earth strap, and here is how to prove it.....

If the problem is regular and predictable; meaning you know that if you go out to the vehicle in the morning and it behaves in a similar way each day, there is a simple test to perform:

Get a decent quality jump lead and attach one end to the earth stud under the bonnet. It sticks out above the grille on the nearside, close to the headlamp. Attach the other end to the engine. There should be a lifting eye visible at the gearbox end of the engine close to the end of the plastic cover or a metal hoop in much the same place; these are ideal. Make sure any excess cable is clear of any moving parts such as fans.

You should now switch on the ignition and start the vehicle. If you don't have any warning lights, your need for an additional earth is proven.

I should also say that normally when there is an earth problem the first sign is that the engine revs a couple of hundred revs higher than normal and gradually builds to this over about a minute, This is because the ECU is not getting enough earth (power) and believes that there must be something wrong with the alternator and tries to compensate by making it produce more power.

There are many symptoms that are cured by the same solution. The addition of a second earth strap will not provide world peace or an end to poverty but it may well solve all of your problems!

Good luck.
userCliveH
Posted: 30 April 2014 11:58 AM
Subject: RE: 3.0 comfort-matic gearbox failure
 
Lord of the posts

Posts: 6068
500010002525


euroserv - 2014-04-30 11:35 AM


I should also say that normally when there is an earth problem the first sign is that the engine revs a couple of hundred revs higher than normal and gradually builds to this over about a minute, This is because the ECU is not getting enough earth (power) and believes that there must be something wrong with the alternator and tries to compensate by making it produce more power.

.


Now that is interesting - The Discovery does this but mainly when it is wet. Over this winter it obviously did it a lot. It has been better of late tho.

Quick cure was manually flicking it over to LPG rather than the automatic transfer. But the tick over was still erratic which is a nuisance when reversing a trailer (the torque is so great we usually do this on tick over.


userarjxh56
Posted: 1 May 2014 9:50 AM
Subject: RE: 3.0 comfort-matic gearbox failure
 


Pops in from time to time

Posts: 105
100


Update....
There are a couple of conflicting snippets of advice so I'm not sure if what i have done is good, bad or ugly!

I have removed the original earth strap and thrown it away.

I could only get a 240A rated cable made up and i believe i needed at least 250Ah or more so i have added 2x brand new 240Ah (35mm2) rated cables from the original chassis point to the gearbox. Just out of curiosity i checked the resistance of the new earth cables and the old earth strap and the figure was identical.

I have also added 1x 240Ah rated cable from the battery earth to the lifting eye mountings on the engine block. (this is the part that i see conflicting information about)

I cleaned up the earth connection on the starter motor and sprayed all of the other chassis earth points under the wing with contact spray.

Next I started the engine, with the door open and interior light on.
As previously the engine starts, the interior light is average brightness, and the revs slowly creep from about 800 to 1100. When the revs hit about 1000 the interior light gets brighter as though the voltage has increased, the engine revs stop increasing at about 1100 and then drop slowly back to 800 and remain there. This all happens over a period of about 30 seconds. My friends Ducato of the same year does the same thing but is this actually normal???

I haven't seen the gearbox failure light come on since getting it home the other day. As you know i tried to recreate the issue before making any changes to the earth wiring and couldn't. I have since swapped the wires as described above and will use the vehicle and see if the problem comes back. I haven't seen any difference to anything after changing the earth wiring?

I have not yet had the time to take the covers off and check the connections under the passenger headlights as i tried to do it last night and the heavens opened! I didn't fancy doing it in the rain.
userBrambles
Posted: 1 May 2014 10:55 AM
Subject: RE: 3.0 comfort-matic gearbox failure
 


Forum master

Posts: 4157
200020001002525


You should not need to add a cable from battery negative to the engine mounting lug, I would remove it as could actually cause more problems that it is worth. It can cause undesirable ground loops. If it does cure the problem then it is because it is highlighting an issue elswhere so should be seen as a temp fix.

Now the two main earth straps. Connect both to chassis earth point as you have, but connect to two different points on gearbox. Again there is good reason for this as it wil reduce effective resistance and impedance a lot. For all anyone knows it may actualy work because of high resistace in the alloy around the bolt for the 1st cable, adding a second to same point will have little effect. Using a separate bolt reduces the resistance of the overall connections.
usereuroserv
Posted: 1 May 2014 3:54 PM
Subject: RE: 3.0 comfort-matic gearbox failure
 
Epic contributor

Posts: 1685
1000500100252525
Location: Leicester


Brambles is exactly right.

I did not (nor did anyone else) advise fitting any other earth leads between the battery and the engine. I don't think this would be a good idea.

What i did suggest was trying a jump lead between the under bonnet earth point and the engine for the purposes of testing; IF there was a fault present on starting on a regular basis.

In any case, what you have done (once the battery to engine cable is removed) is exactly what we have done in the past; what Fiat dealers were instructed to do and what we know works in almost all cases like yours.

Try it. It is probably ok now. If not it's time to hit the wiring paying particular attention to anything that has been disturbed or un-plugged recently.
userarjxh56
Posted: 2 May 2014 6:56 PM
Subject: RE: 3.0 comfort-matic gearbox failure
 


Pops in from time to time

Posts: 105
100


Thanks guys.. I didn't mean conflicting info just on here, I have read many other sites/posts and there appears to be a mix of those that said to leave the engine to battery earth on permenantly Vs those that say to remove it once tested.
I will leave it on for a while and see if I get a recurrence of my issues. If I get the problem back I know it's not earth related? If nothing occurs for a while I'm just not sure how long to leave it? It was about 800 miles between issues over the last 2 weeks so maybe 1000 miles may be a good test?

If I remove the lead from the battery and put it on the chassis next to the battery, where the battery first connects to the body.. Would that be a safer option than leaving it attached to the battery? Or is it the fact that there is another earth to the engine block in general that needs removing (putting it back to the original configuration of gearbox to chassis only)?

It was occurring to me last night that it was particularly wet at points between when it failed the first and second time. I was wondering if water spray from the road, or rain getting in from the windscreen scuttle etc that may have played a part? What do you think? Should I wrap parts of the engine wiring and connections in plastic as a precaution?

I appreciate all of your help. Hope I can return the favour some time.
userBrambles
Posted: 2 May 2014 10:53 PM
Subject: RE: 3.0 comfort-matic gearbox failure
 


Forum master

Posts: 4157
200020001002525


No, the lead to battery should be removed and not connected anywhere else.
Water getting into a connector is very much a possiblility.
userarjxh56
Posted: 5 May 2014 8:16 PM
Subject: RE: 3.0 comfort-matic gearbox failure
 


Pops in from time to time

Posts: 105
100


400 miles since the last occurrence .. No further faults but only driven in dry weather so far. Ill keep you posted.
userarjxh56
Posted: 6 May 2014 10:09 PM
Subject: RE: 3.0 comfort-matic gearbox failure
 


Pops in from time to time

Posts: 105
100


Now booked into Northern Commercials on thursday for diagnostics. I will let you know what they find.
userBrambles
Posted: 6 May 2014 11:34 PM
Subject: RE: 3.0 comfort-matic gearbox failure
 


Forum master

Posts: 4157
200020001002525


Be interesting to see what faut codes are logged. Good luck with it all.
userPampam
Posted: 7 May 2014 5:42 AM
Subject: RE: 3.0 comfort-matic gearbox failure
 
Treasured contributor

Posts: 843
50010010010025


Glad to hear you got it all sorted ,you certainly got plenty of good advice off the forum wish id been a forum member when our comfortmatic konked lol pp:) (turned grey overnight )
userarjxh56
Posted: 7 May 2014 8:25 AM
Subject: RE: 3.0 comfort-matic gearbox failure
 


Pops in from time to time

Posts: 105
100


Pampam - 2014-05-07 5:42 AM

Glad to hear you got it all sorted ,you certainly got plenty of good advice off the forum wish id been a forum member when our comfortmatic konked lol pp:) (turned grey overnight )


Its not sorted unfortunately, booked in for diagnostics tomorrow see if the fault can be found this time round.
I agree the advice on here is fantastic, i would have been lost without it.
userarjxh56
Posted: 8 May 2014 6:51 PM
Subject: 3.0 comfort-matic gearbox failure - And Alternator Issue?
 


Pops in from time to time

Posts: 105
100


Latest update....
Diagnostic check at NC today showed the error logged from when i had the recurrence of the gearbox failure light. It showed the same sensor fault as last time but this time it cleared when the technician reset everything. I was reassured the sensor was checked last time and it wasn't the cause but something else has caused this fault code to appear. If it was me, i would be tempted to swap the sensor but they are sure its fine.

The gearbox was re calibrated and there were no obvious faults for the technician to see, he could not re create the gearbox failure during the 1hr slot i had booked?
BUT he did mention the Alternator again.... As i described before, the engine on start up increases revs up to about 1100 rpm and then drops back and remains on idle permenantly. He says this is a charging issue and that the alternate needs changing to stop it revving up initially. The Alternator is showing 14.2v output at the battery, but he did connect another 'machine' and say that it was showing a charging fault and that it needs to be rectified via a new alternator?

The other really interesting thing he saw was.... at the time the gearbox failure light came on the voltage was recorded as 11.5v in the memory. This is really strange because the battery had been on mains overnight, showing over 13v on the panel in the morning. We then drove for 2hrs with the alternator presumable charging as normal. I then stopped in the services and turned the panel on and the panel showed over 13v on both Cab and Hab batteries... I then left the van for a sarny and coffee break returning to start it up to carry on which is when the fault occurred. An hour later and after another hour of faffing around trying to clear the fault, the AA man checked everything before declaring it wasn't fixable and the battery was still showing over 12.7v and passed his load test?? Where did the 11.5v come from??
The battery was also checked today by NC, who actually changed the battery less than 2 weeks ago, and they said it was perfectly fine but said the alternator is causing a charging fault (despite the output still showing 14.2v when the engine is running?)
I am confused?! Does this make sense to any of you guys?
I did see the charging error message on the machine and i cannot recall what message it said, although I would remember it should someone repeat it!
I am trying to think what could have pulled the voltage down that much at the time the failure occurred but its lost me. The technician was also stumped at this one?

I was also told that the small black wire that attaches to the alternator is the comms wire and during start up the ECU checks the signals to and from the alternator using this wire. I was told that if during start up the ECU detects an error in the charge circuit it may throw up errors such as the gearbox failure light? There are no guarentees the alternator fault has anything to do with the gearbox fault but they say it needs taking out of the equation anyway.
I have owned 2x Ducato 3.0 engines and both did the revving up and settling... My friend has the same van and his revs the same.. his previous van also revved the same.. Thats 4 different 3.0 ducato vehicles, all doing the same, but none of the other vehicles have had any issues or were ever flagged as being at fault? I have also done 9k miles with the revving always being present and had no issues until now. I did ask the service centre when it was in for service about it and they also said "they all do it, just ignore it"
Has anyone had this revving up at start up and had to change the alternator? Did it resolve it?

NC agreed that the next step, after the alternator is changed, is to drive it and use it until such time the fault re occurs with the gearbox.. i am just going to be on edge everywhere i go, parking only where i think a flat bed will be able to get in for recovery! Its sooooo frustrating!
userKeithl
Posted: 8 May 2014 7:22 PM
Subject: RE: 3.0 comfort-matic gearbox failure - And Alternator Issue?
 


Lord of the posts

Posts: 5678
5000500100252525
Location: Birmingham. 2004 Auto-Trail Cheyenne Mercedes 313.


Could the 11.5v reading have been during cranking?

If so it would be a sure fire sign of either a faulty earth somewhere between battery and starter OR on the live side of the 12v. The ECU will measure the voltage within its own circuitry so, say a faulty earth, would cause a low voltage at the ECU and hence your fault code and transmission fault.

The low voltage would only need to be for a fraction of a second for the ECU to flag the fault so almost impossible to trace without proper diagnostic equipment! I doubt very much if you would see it with a digital multimeter as the change would be far too fast.

I think you need to get a very fast recording voltage meter or oscilloscope connected to the ECU supply to trace the fault further. I would suggest a minimum sampling rate of 10 samples per second but ideally 100. You should be able to pick up the ECU voltage at the diagnostic socket as it has a supply for running diagnostic readers.

PS Have a look at this website for the sort of scope I am talking about... Link to Pico.

HTH,
Keith.

PPS OR it could be a faulty connection at the ECU as has been suggested earlier!

Edited by Keithl 2014-05-08 7:28 PM
userMuswell
Posted: 8 May 2014 7:45 PM
Subject: RE: 3.0 comfort-matic gearbox failure - And Alternator Issue?
 
Epic contributor

Posts: 1061
10002525
Location: North London


Keithl - 2014-05-08 7:22 PM


PS Have a look at this website for the sort of scope I am talking about... Link to Pico.



Did you have to? Luckily they are quite expensive so it was relatively easy to resist another fix for my tool acquisition habit.
userKeithl
Posted: 8 May 2014 7:59 PM
Subject: RE: 3.0 comfort-matic gearbox failure - And Alternator Issue?
 


Lord of the posts

Posts: 5678
5000500100252525
Location: Birmingham. 2004 Auto-Trail Cheyenne Mercedes 313.


Yes Muswell, I'd love one too but unfortunately outside my budget as well

I do use equipment like this at work so know it's uses and limitations but unfortunately can't afford my own. Although there could be a market to offer a service... Now that's got me thinking

Keith.
usereuroserv
Posted: 9 May 2014 10:34 AM
Subject: RE: 3.0 comfort-matic gearbox failure
 
Epic contributor

Posts: 1685
1000500100252525
Location: Leicester


I only have one 3.0 van on site at present and it just happens to be my comfort-matic. It started immediately and went straight to normal idle speed with no surge at all.

I have my doubts that there is anything wrong with the alternator on your vehicle; I still think this is a wiring problem but in your position I would say something like this to them;

" You are the experts regarding this vehicle. You have the training and continuing support of Fiat to call upon. If it is your considered opinion that the alternator should be replaced in order to cure this problem and to stop the surge in revs when the engine is started I will agree to pay for this on the understanding that should it not solve one or both of the issues that we have, I will expect you to replace the new alternator with my old one or to not have to pay for the incorrect diagnosis or repair".

To me; this is the price of being an expert. Why should a customer who has put his faith in you have to pay for your mistakes? The expert can write off the labour internally as 'training'. You should not be paying for their people to learn how to do their job.

As I said before; once the earth strap is sorted out, the next logical step is to examine the wiring loom in the area below and around the nearside headlamp. There are many small wires in a tightly packed bundle. One or more may be weakened and not passing the correct signals, there may be a short. It's where these problems hide on X250 vehicles. It happens a lot. Fiat know this and so do the dealers.

A long time ago I said it won't be the ECU or the control unit, that you don't need to remove the gearbox to change the control unit and that it would be the earth or a wiring fault. I am not the guy that says 'I told you so' but get the wiring checked.

While you are at it; GET THE WIRING CHECKED!
userCliveH
Posted: 9 May 2014 10:44 AM
Subject: RE: 3.0 comfort-matic gearbox failure
 
Lord of the posts

Posts: 6068
500010002525


Sound advice indeed - my only suggestion is that the excellent wording cited should be put in writing - not an email - but a good old fashioned snail mail letter sent via the post office so that it has to be signed for.

And then ring or call in a few days later to discuss what they intend to do.

If they say they have not received it - then send it via email - basically make sure you have a clear and demonstrable audit trail as to exactly what is going to happen if what they suggest does not work.


userSteve928
Posted: 9 May 2014 11:05 AM
Subject: RE: 3.0 comfort-matic gearbox failure
 


Epic contributor

Posts: 1223
1000100100
Location: Fife, Eura Mobil Profila T720EB


euroserv - 2014-05-09 10:34 AM

As I said before; once the earth strap is sorted out, the next logical step is to examine the wiring loom in the area below and around the nearside headlamp. There are many small wires in a tightly packed bundle. One or more may be weakened and not passing the correct signals, there may be a short. It's where these problems hide on X250 vehicles. It happens a lot.


This is probably a good point at which to show again my picture of just such a wiring fault in that exact location, from the earlier 'That X2/50 Earth Strap Again' thread.

This gave similar spurious faults to the OP's (though nothing to do with Comfortmatic) and in a period of dry weather we happily covered 700+ miles fully believing that a new earth strap had fixed the problem, until the next damp, cold spell brought the fault back.

If you don't fancy DIY cutting into the wiring looms yourself then find a specialist auto-electrician who can load test each individual wire. I believe that the good ones have special 'clips' to attach to all of the vaious plugs on the looms.




(PC040070.JPG)



Attachments
----------------
Attachments PC040070.JPG (49KB - 464 downloads)
userarjxh56
Posted: 9 May 2014 12:21 PM
Subject: RE: 3.0 comfort-matic gearbox failure
 


Pops in from time to time

Posts: 105
100



Northern Commercials assure me that they have checked the wiring and also load tested the loom (whatever that means) that was all part of the 10hrs labour I had to pay for last time. Fiat wouldn't cover the cost of diagnostics.
usereuroserv
Posted: 9 May 2014 4:21 PM
Subject: RE: 3.0 comfort-matic gearbox failure
 
Epic contributor

Posts: 1685
1000500100252525
Location: Leicester


So they say.

Do you trust them?

I have my doubts regarding their competence so far. The whole "Got to remove the gearbox to remove the control unit" thing would have had me in stitches if it were not so pitifully stupid.

Unless you want to spend months running around chasing your own tail you need to find someone independent that is good with electrics to go through the loom and make sure.

We work on these vehicles all day; every day. It's what we would do.
userarjxh56
Posted: 9 May 2014 5:49 PM
Subject: RE: 3.0 comfort-matic gearbox failure
 


Pops in from time to time

Posts: 105
100


Just had a call from Fiat to say they will cover the Alternator cost. I am now waiting for the part to arrive.
I also had a call from NC to say they will let me know when i can go for the fitting, likely to be next Tuesday. They also mentioned they don't think they will be able to fit it in the allocated time?

Its really good news that Fiat are still helping out and being efficient too. I am impressed with the after care from them so far. I just hope this resolves the revving and the charging issue that NC say it will.. Fingers crossed.

Once this is resolved there will hopefully be zero faults listed in the memory and so if/when the gearbox fails again the focus can be on finding the fault without distractions?
userPampam
Posted: 11 May 2014 7:38 AM
Subject: RE: 3.0 comfort-matic gearbox failure
 
Treasured contributor

Posts: 843
50010010010025


Phew good luck (yet again ) arjkx hope they sort it good job you werent away at moment with all the rain weve had pp:)
userarjxh56
Posted: 15 May 2014 4:50 PM
Subject: RE: 3.0 comfort-matic gearbox failure
 


Pops in from time to time

Posts: 105
100


Update.....

So the new alternator is on and NC are happy.
Im not so happy yet, I am a little confused! If you recall right back when i first went in, the garage said that my alternator voltage was not enough at 13.9v (idle speed) so i needed a new one. This view has changed dramatically and I'm not sure what is correct....

On the previous alternator the voltage was around 13.9 at idle and up to about 14.2 revved, but it did go up and down...With the new alternator the voltage being produced is now between 12.2v and 12.9v. (depending on the load). They told me it was due to the fully charged battery not needing any more voltage so i flattened it to under 12v (around 11.9 once settled down) Despite this, the alternator voltage still doesn't go any higher at idle or at 200rpm.

NC tell me that the engine ECU is smart and knows how much the battery needs and thats all it must need.
I am just a little worried that things are now worse than they were before and that i will end up with flat leisure / cab batteries due to lack of charge??? I did ask 3 different engineers at NC and all of them said the alternator was now working correctly.

Are they correct and is this normal? Should i just chill out and stop worrying??

Thanks

usereuroserv
Posted: 15 May 2014 5:24 PM
Subject: RE: 3.0 comfort-matic gearbox failure
 
Epic contributor

Posts: 1685
1000500100252525
Location: Leicester


The engine ECU is indeed smart but it cannot alter the output voltage of the alternator. If the alternator voltage regulator is working correctly it will be supplying between 14.2 and 14.4V at idle ; with or without headlights switched on etc.

I am at a loss as to what these people are talking about. They may be measuring the output at the alternator or through the ECU port and finding the correct voltage but you are measuring it somewhere else. If it is between the positive terminal and the earth point in the engine compartment I can see no reason why you should be getting a different reading to theirs. If they are getting less than 14v, something is wrong.

I would use it, test it and see if the other problems have gone away before worrying about this.
Does it still rev up after starting, or has this issue disappeared as they said it would? That was one of their reasons for changing the alternator, after all.
Jump to page : FirstPrevious 1 2 3 4 5 Last
Printer friendly version
E-mail a link to this thread
Jump to forum :


(Delete all cookies set by this site)(Return to Homepage)

Any problems? Contact the administrator