A couple of years ago, whilst riding on the autoroute just north west of Tulon on the way back from Corsica, I had the dash light up like a Christmas tree accompanied by a stutter in power. Somewhat alarmed I pulled over at the next available service area. On cycling the ignition the dash calmed down and was just showing the orange engine management light. Everything mechanical seemed OK so we continued on our homeward journey, the bike was now running as well as ever. Later that day, after a few ignition cycles between riding the engine management light went out. Once home I plugged in the OBDStar and noted that there seemed to have been an issue with the rear speed sensor. Removing the sensor I could see some slight damage to the plastic surface although the sensor seemed to still be working so I refitted it. A few months later I stripped the rear hub to clean and grease the outer bearings and free up the eccentric adjuster. At that time I noticed a score across the rear calliper carrier bracket that also locates the speed sensor, the probable cause of the issue in the South of France I thought, road debris trapped between the rear phonic wheel disc, the aluminium carrier and across the face of the sensor. Fast forward to yesterday and a ride with some mates; riding shortly after lunch and the dash lit up in the same manner but this time the error seems to be more persistent. It went way for a short while on an ignition cycle but came back about 5 minutes later. Quite a few of the electronic aids seemed disabled (DQS, DTC, ABS and DWC all said ERR), the speedo failed to work, the quick shifter (DQS) no longer functions and the yellow DSS indicator along with the ABS fault, engine management light and alert triangle all illuminated. Manged to ride the 50 miles home. Plugged in the OBDStar and ran the diagnostics which came up with the following: Looks like a more permanent version of the previous issue and down to me not replacing the sensor last time around. Removing the sensor confirmed this as what was the scored face previously is now in a far worse condition. Cleaned it up, reinstalled and cleared the error codes. Will try riding it in the next day or two and see but if it works again, I accept that, if it does, it'll be only a brief respite and replacement is necessary. The sensor and attached cable is £115+VAT new. There are a few on eBay with one in Lithuania at £29 though there may well be VAT and duty payable. There are a couple from V4 PP Multis as well on eBay, they appear to have the same part number. Common part, from Bosch, across a few models it seems. Looking at the workshop manual the cable routing will be the biggest part of the job.
Not sure if it means anything, but your battery reading is a little low. Reckon it could be influencing the issue, causing what's reading as sensor fault when it could just be patchy juice? Doubtful, but it's all I can add. Fingers crossed it's a simple one
Thanks, the OBDStar tends to post a low reading compared to my tracker which is showing 13.3v. However, battery is over 5 years old now. Planning to replace it ahead of next tour.
By the end of next week my bike will have an identity crisis as it'll be part V4 Pikes Peak... That's what I'm trying to convince myself anyway The sensor from Lithuania was too much of an unknown, poor pictures and from what I could see wasn't in great condition. Added to which, despite there being the option to place an offer on eBay they weren't willing to let it go for anything but the posted price (why bother then?) and long shipping time... Also VAT added to price... So a pretty pristine one from a V4PP is on the way from a breakers in Kent who accepted a reduced offer of £45.
Speed sensor now fitted. A ten minute job at most to unbolt the sensor and then a couple of hours to strip off the hugger, an additional inner cover, the right side panel and the silencer. Still a struggle to feed the able through, especially given the relatively bulky connector. Wound up cutting the old cable, splicing that to the end of the new one with gaffer tape which got me most of the way there. Lots of swearing and flexing plastic parts to get it through. Then reassembly... My best mate meanwhile was on a tour of the factory in Bologna. I asked if he could find the person responsible for the cable routing and give him a good slap for me Same mate had suggested cutting the cables, soldering and using heat shrink and self amalgamating tape... In retrospect he was probably right. Anyway, job is done though I've yet to test ride, read and clear codes.
