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Post by banditken on Jan 30, 2022 20:20:10 GMT 1
Hi All, a strange one today with my daughters 2018 1.6 biturbo Trafic – if anyone can help??
The van was driving normally and when she put wipers on auto – around 20-30 secs later, the van went into limp mode. Engine light on, no response from accelerator pedal, light on stop/start switch, engine on tickover then revving to 2000rpm then back to tickover all by itself.
We got the van home in limp mode and I plugged in a cheap code reader but no codes.
Started the van and all is well with no lights so took it for a run and it ran as it should even with wipers on slow or fast speeds.
So tentatively we tried the wipers on auto but again the same symptoms as earlier. I had the code reader with me and plugged it in but no codes.
Switched engine off and waited a minute or two – it started fine like before and the van drove home with no problems.
It seems as though there’s a problem somewhere in the auto bit of the wiper circuit/module as there’s no problem when they’re in the usual slow and fast speeds. She's had the van 5 months now she tells me that the auto setting on the wipers has never worked but today this is the first time there's been a problem
Anyone had something similar? Thanks for any help folks.
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Post by Joepublic on Jan 30, 2022 22:10:54 GMT 1
Auto wipers would use a screen mounted sensor? Maybe the van has had a screen replacement in the past and that’s upset the auto function?
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Post by rhyds on Jan 30, 2022 22:17:45 GMT 1
I think you'll need to get someone with a decent scanner to have a look at the live data, especially regarding the auto wiper sensor.
My suspicion is (and this is a guess, so don't take it as gospel) the sensor for the automatic wipers is somehow feeding spurious data to the ECU that controls the wipers, and that in turn is causing the other issues. You'll need access to a code reader/scanner that can communicate with all of the van's modules to get an idea of what's putting the engine management light on.
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Post by remmington on Jan 30, 2022 22:21:49 GMT 1
I have changed plenty of "rain sensors" on these Renault vans (they need programming in).
Never had one that interferes with the engine running.
The ones I have seen - the wipers just don't work on auto.
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Post by banditken on Jan 31, 2022 11:23:35 GMT 1
Thanks all for the information. Rhyds - I'll see about getting it scanned properly at my local garage. Meantime, it started fine this morning and she drove to her work ok. I checked with my cheap scanner this morning before she left and it showed a pending code of P3208 which I cant find details of online. Any idea of what this might be? Looks like it might be a Renault specific code.
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Post by Joepublic on Jan 31, 2022 15:11:38 GMT 1
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Post by remmington on Jan 31, 2022 21:00:48 GMT 1
Personally - I don't think the engine management fault has anything to do with the wipers. You are just cycling the key and everything is being reset. "Put the low spec scanner down and take the van to a garage". Would be my advice....  |
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Post by valhalla on Feb 1, 2022 1:40:04 GMT 1
The only way I can see two totally-disparate systems interfering with each other like this, and it's a long shot;
The Auto function must require the wiper module to input or output data to/from the CANbus, and for some obscure reason, the CAN gateway module is being saturated with a faulty set of signals, such that the important high-speed CANbus items are being obscured from one-another (brakes, engine, airbags, etc. etc.) to cause them to go into a limp-home mode.
It seems almost unbelievable that a low-priority unit like a wiper-delay unit might be able to influence the important stuff (they ought not even be on the same CANbus, as the wiper-delay would logically be placed on the medium-speed bus), but there is just an outside chance that something that bridges the various networks on the Trafic is being fooled into passing eroneous information across. If so, this would make a fascinating subject for a proper diagnostic specialists, and possibly a subsequent safety-recall, should anything untoward be found with the logic.
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Post by banditken on Feb 1, 2022 13:16:27 GMT 1
A visit to our local garage with a decent scanner is definitely on the cards. As an update, she drove the van to and from work yesterday and it drove fine. So last night, took it for a short run while it was raining , and as an experiment (risky I know in case it damaged something) she put the wiper stalk onto on auto, the sensitivity on first setting, wipers gave one sweep, didn't restart though and the van still running fine. Did the same again this time with sensitivity on next setting and 20 secs later, van goes into limp mode, engine light on etc. Stopped van and switched everything off, put sensitivity back to first setting, waited for five minutes, restarted van and all is well !!! Valhalla looks to be right as with there being a delay before anything happens is it all possible that the module or circuit that controls the delay/sensitivity is causing the problem. I'm an old fashioned points/condenser/distributor/coil chap so don't really understand all this modern electrical malarky |
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Post by wightdiag on Feb 2, 2022 0:25:59 GMT 1
I'm with valhalla on this one. I think the wipers pull the vehicle speed off the network on level 2, a bad wiper module then crashes the HS CAN either directly or via the gateway - it would be pretty odd to have the wipers on the HS CAN but you never know! A proper scanner will probably find a pile of U codes. Keep us updated, it's an interesting one that's for sure.
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