Cruise & Speed Limiter Fault C5 X7

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Re: Cruise & Speed Limiter Fault C5 X7

Post by uglybanana »

GiveMeABreak wrote:That clutch switch issue doesn't sound right at all - would explain why the cruise won't engage on a manual - but not on an auto - I wonder if a setting has been changed in the depths of Diagbox by the previous owner / mech., that is causing it to behave like this. At the end of the day they are computers and are logical - if an incorrect value or parameter has been entered accidentally or otherwise it would certainly help explain why it won't engage. The question is what though? One way to help eliminate any anomalies would be to undertake a Diagbox comparison with another X7 owner with an Auto box, either via the phone or using printouts of each screen - a bit arduous, but if you were to look at the most obvious places first, that might be one way. Citroen would have to charge the labour to do this and there probably won't be any guarantee they would know what to look for - it's not the same as following a fault diagnostic tree! If you were to say focus on the transmission area that might at least eliminate any inconsistencies. I would help, but don't have an auto, but if there are any other settings you want me to compare, just shout.

Thanks I'll dig into those areas, see if anything looks strange and take a few screenshots. One other odd thing I have found while removing the trim under the glove box (not the one in the glovebox) to get at the brake switch are 3 loose wires on the very left hand side directly where all the relays are. They have been cleanly cut and are wrapped in like a thin protective foam but they're not connected to anything so I'm not sure if it was like that from the factory. Seems odd that snipped bare wires would be left exposed like that from new but you never know. It's close to where a clutch pedal would be on a left hand drive so wonder if that could be connected.
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Re: Cruise & Speed Limiter Fault C5 X7

Post by GiveMeABreak »

Interesting - I've just quick look at the wiring diagrams and in the picture below:
2120 is the Brake Twin Function Switch
1261 is the accelerator pedal position sensor
Cruise.png
On the wiring diagram, I can see that both 2120 & 1261 are connected to the Engine ECU (1320), which is linked to the Auto Box ECU (1630) and these are linked to the ESP ECU via the CAN. So maybe looking at the parameters for these ECUs may help for a comparison.
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Re: Cruise & Speed Limiter Fault C5 X7

Post by uglybanana »

Ok so I've just had another look. There is only one menu option for the cruise under the driving assistance section which is on. I've taken some pictures of the loose wires I found and screenshots of various ECU's.

In the Ignition ECU miscellaneous section it shows both brake switches as released but in the ESP ECU brake switches and relays section it shows secondary stop lamp switch pressed but stop lamps switch released. That seems like one possible inconsistency. In the images in the album I've linked to there is one image in the Ignition ECU miscellaneous section that shows one released one pressed but that was me pressing very slightly on the pedal finding the balance before both changed. With my foot off the pedal it says both released but in the ESP ECU the secondary stop lamp always says pressed.

The DCM3.4 Misc image also shows the clutch pedal pressed issue. Hope this all makes sense and thanks for all the help.

http://imgur.com/a/uTHGT
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Re: Cruise & Speed Limiter Fault C5 X7

Post by Maki »

Hi everyone, I have exactly the same problem with my cruise control as described here, was it solved?
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Re: Cruise & Speed Limiter Fault C5 X7

Post by Maki »

Anyone? how could I reach the author of this topic? I wrote him PM, but I see the message in the outbox, but not in the sent folder :(
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Re: Cruise & Speed Limiter Fault C5 X7

Post by GiveMeABreak »

You will have to be patient, the message has been sent and will stay in the outbox until the recipient reads it. When it goes from the outbox you know it has been read. Try sending an email instead if the member has allowed it. Remember not all the members are active on the Forum all the time.
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Re: Cruise & Speed Limiter Fault C5 X7

Post by myglaren »

He hasn't been on here since last June.
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Re: Cruise & Speed Limiter Fault C5 X7

Post by Maki »

Pity :( I'll have to wait then if no one has any Ideas on the problem itself. Thanks
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Re: Cruise & Speed Limiter Fault C5 X7

Post by GiveMeABreak »

That's why we always encourage people to try and update the topic so others can see the resolution.
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Re: Cruise & Speed Limiter Fault C5 X7

Post by ADY-ULTRAS »

Hi! I have the same problem. I was driving on cruise control and suddenly it went off and show only dashes instead of the speed value. If I press off button and on again, speed limiter comes first but I can't activate neither one. No ECM light or errors. Any ideas?!?
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Re: Cruise & Speed Limiter Fault C5 X7

Post by GiveMeABreak »

Better get a diagnostic on the vehicle. Speed assistance functions are the first to be deactivated in the event of an engine or ABS / ESP fault. It may be a temporary fault. Stop the car, switch the ignition off, wait a minute and restart, then activate cruise and set a speed and see if that fixes it. If not, then further investigation is needed and ideally Diagbox hooked up to see what if any faults are recorded there.

As in the other posts, this could be a brake switch issue too.
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Re: Cruise & Speed Limiter Fault C5 X7

Post by admiral51 »

Are any of the last 2 owner posts 1.6 HDi by any chance.?
Only asking as the symptoms are similar to the issues i ignored with the Devil Car.
Not heard from Mike T for a long time but it is still running and passed its MOT last month but the main culprits were the Air Doser (double butterfly) and the turbo vacuum valve.
The Cruise and speed limit would work and then suddenly drop out and not be able to re engage until switch off and restart. At the time i did post the fault codes so if you can get it on a Diagbox then pretty sure the codes would be logged.

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Re: Cruise & Speed Limiter Fault C5 X7

Post by GiveMeABreak »

Yes, ADY-ULRTRAS is a 1.6 HDi 110 Colin.
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Re: Cruise & Speed Limiter Fault C5 X7

Post by admiral51 »

Here is what i call the Devil Car Thread
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Re: Cruise & Speed Limiter Fault C5 X7

Post by ADY-ULTRAS »

Quick update! In the morning when I left to work the cruise control came back on, all working fine but after a while came off again. Basically when it's accelerating to rich the set speed. On diagnosis it's P0299. I change the solenoid turbo valve but surprise, still the same issue. Someone said to change the one way vacuum valve but I can't find the location. Can someone give me a hint where it might be? Thanks!
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