ASR Light on 2017 Partner Professional. BHY 6

[tpn]

Hi folks, New here; thank you for having me. I have tried another forum, without success.

. Basically the ASR light is on the above vehicle. No mil or ABS light on.

The ABS is working and all the wheels are reporting the same speed. On diagnosis it is showing a fault "brake pedal incoherence"(i have loaned my unit to a friend so cannot remember the code, something like C00400) I got a new 4 prong switch but no good. It also sometimes showing a U1213 code -fail to communicate wits ABS/ASR and states that the "electrovalve supply relay status is faulty, sometimes on the Electrovalve.

The brake lights are working as they should, though diagnostics does not show that the pedal is pressed. It is showing brake pressure though.

The ABS is working, as I have braked sharply on gravel to test it. The Cruise Control is not working. Hill assist is working.

It is just the ASR light that is showing. No MIL, no limp mode.
Anybody with experience of this issue to assist with this would be appreciated, as it is for test in a weeks time.
Edit: can any of you show where the electrovalve relay is located on this van?. It is not where it is shown on the earlier models

[tpn]

anybody?

[GiveMeABreak]

The ABS / ESP Hydraulic Block and ECU are behind the left wing area, behind the wheel arch splash shield if that's what you are referring to. If you can obtain the exact fault codes and pop the VIN up (please post your VIN in full without spaces - it will be automatically masked from public view after submitting your post & will only be visible to staff) I can take a look at what I have. But without the exact fault codes you'll be clutching at straws.

[tpn]

I have a fair amount of experience of diagnostics, mostly on Mercedes; Audi and VW, but this has me stumped. I would have checked the front right ABS sensor (often associated with a C0040 code) but it is showing the correct speed and the ABS is ok.
What is the sequence for resetting the BSI?


I checked the hydraulic block and checked all the connections. They appear in order.
I have changed the brake pedal switch, no difference.
I have checked every connection that I can find and cleaned them with Electrical Contact Spray.
I have checked the brake pedal coherence fuse that sits on top of the battery.
All the wheels are showing the same speed.
Diagnostics state that the steering angle is OK.

Everything works except the cruise control

I have checked the connectors for the brake switch and it is ok.
The brake lights work.

The van has just 36k miles done.

I have the codes just did not have them at 2.00am when posting.

Codes: C0040 incoherence of brake pedal sensor.
U1213 fault in communication with ABS/ESP ECU. Communication not valid.

Diagnostics also show the electrovalve relay is faulty. Only sometimes. This does not throw a code.
This relay was located in front of the battery on the older Peugeot, but not on this one. Apparently it was often the cause of the C0040 code.

Van does not have electronic parking brake etc, just reversing sensors and cruise control/limiter. Limiter works fine but that works on a different system. Cruise control does not work.

VIN number is VF3**************[VIN obfuscated, can be read by forum staff]

Thanks for your time

[GiveMeABreak]

Ok, as I suspected, these faults are not returning anything other than similar to what you have.

As for the brake switch, if you bought a cheap replacement or got it from ECP, then that could be the issue - they're useless and often dead on arrival.

As for the U fault, these are communication data faults. Vehicle speed is the clue, and won't be a wheels speed sensor necessarily, as they will provide their own fault codes, however if there is an issue with the connection / wiring or the ESP ECU itself then it won't be able to provide you with anything meaningful for the fact it can't communicate.

C0040: Brake pedal switch fault: Coherence with the pressure sensor.
U1213: Fault in communication with the ECU ESP: Vehicle speed information invalid

[tpn]

Had a full post ready to send and it disappeared. I guess there is not any autosave on this forum.
anyway a synopsis of what I had written.
Its an original switch. Appears to be working.

As well as showing the speed from each wheel the diagnostics show the speed separately also..and they correspond.

The brake lights work but I did notice that diagnostics show the brake pedal as "depressed" all the time.

It shows that brake pressure is being applied. ABS is working, so there is communication just the cruise control is not working.

when the brake pedal part of the switch is bridged the brake lights work also.

I will see if the pedal reading changes when it is depressed.

What I do not have is a wiring diagram that shows where the loom-each wire- from the brake pedal switch goes and what happens voltage wise and otherwise when the pedal is depressed.

I do not know where the various relays are hiding, in particular the electrovalve relay.(it was a double relay in front of the battery on the older Peugeot)
I have looked at fuse diagrams on the net but, whereas they mention the relays none of them show where they are.

I do not now where the canbus grounds are. In the Merc they were in the footwell and caused all sorts of lights to flicker when moisture got into them.

There is a large blue wire just hanging in the inside fusebox. I do not know its purpose.

As cruise controls are connected via canbus it is most likely that the fault is canbus, especially as no MIL etc comes on.

[RichardW]

The brake lights work but I did notice that diagnostics show the brake pedal as "depressed" all the time.

It shows that brake pressure is being applied. ABS is working, so there is communication just the cruise control is not working.

There's your problem - pedal switch is off, but the ABS unit is seeing pressure. There was an almost identical thread a couple of weeks ago, but I don't think it got resolved. My guess is the pressure sensor is internal to the ABS unit, and it is faulty....

[tpn]

The brake lights work but I did notice that diagnostics show the brake pedal as "depressed" all the time.

It shows that brake pressure is being applied. ABS is working, so there is communication just the cruise control is not working.

There's your problem - pedal switch is off, but the ABS unit is seeing pressure. There was an almost identical thread a couple of weeks ago, but I don't think it got resolved. My guess is the pressure sensor is internal to the ABS unit, and it is faulty....

I would expect that if the pressure sensor was faulty it would not show the various degrees applied to the brakes....and the ABS is working. I am open to persuasion though, as I am not familiar with Peugeot wiring, though it looks as if I will have to become familiar with it

[tpn]

OK, thank you for your efforts. I will continue diagnosing the problem. I will surely find something, sometime. If I had a diagram of the abs wiring it would be a help.

[Bmc]

Hi have you ever got this problem sorted I have the exact same problem

[gittmcguiness+23]

Hi did you ever solve this .I've the same problem on a 2017 berlingo. Exact same as you described

[melcom]

I have the same problem. I think that it will be a abs module or BSM.

[gittmcguiness+23]

Did u ever find this. Have same symptoms on 2017 berlingo