If you can roll the tire backwards with the motor running you will hear grinding and feel the motor skipping through the wheel. It is the only original shift sensor … The higher your voltage is the worse the problem seems to get. Throttles rarely fail. If you have Facebook you can post there and link us here or Instagram. If the plastic connector has started to melt or the contact is black and damaged then replacing the connector is recommended. no evidence of water, grime, chafing, or damage. Symptoms of a bad or failing engine knock sensor include slow acceleration, reduced fuel economy, and the Check Engine Light turning on. 2.6 External Speed Sensor Installation SR SD02.01 15 2.7 Drive Unit Installation 18 3 System Cabling 25 3.1 Connection of the Battery Cable to the Drive unit 25 3.2 Connection of the Speed Sensor to the … It still knows when I’m spinning the crank arms and accelerates. This allows you to know when the unit is going to overheat and to stop feeding it so many watts before it does. This occurs when your axle has twisted or bent. When climbing in a rocky road, especially when I make a jump and slow down, the motor stops giving assistance for one turn of pedal, expecially when assistance is really needed and in some cases I stop. Change ). But thats not where the story ends…. He is most likely an alien from another planet sent to Earth to shame all other ebike builders for their messy work areas. The problem is this. My bike mechanic plugged it in and it works. YourMechanic All rights reserved. The connector can be broken but still look fine from a cursory inspection. A $5 thermometer can save your $80 controller. I therefore bought an ebay controller, and whollah it worked again. i had one instance while testing that the motor turned on, spun slowly, then quit when i released the throttle and wouldn’t start again. A visual inspection of the connector should show if arcing has damaged the contact points. enjoy. If the ebrake sensor is busted or accidentally active then the drive unit will not do anything when it is on and the display is active and you will think it is a dead controller. Post was not sent - check your email addresses! Then you put on the rubber washer and tighten down the 2nd lock nut against the first lock nut. display lights up, speedo works, battery full… but no drive / power when i twist the “throttle” and no power assist when pedaling. Download Gear Sensor … Most people have a favored foot that they feel most comfortable being forward when you are not pedaling, just swap it with the other foot and keep riding like a hooligan. Melted windings can fry a motor, a hub motor is shown not the BBS02 unit, Just because the motor won’t work does NOT mean the controller is dead. Using a custom removal tool like this one from Cali-ebike makes removal & install of the BBS02 much easier, The motor keeps drooping down like a cow udder when you go off jumps. Buy sensor sensor - Shift Sensor for Bafang E-Bike BBS01 BBS02 BBSHD Mid Drive Motor Gear Sensor Three Core Waterproof Connector 24CM Cable online on Amazon.ae at best prices. If the mosfets on the controller are blown you should feel a fair bit of resistance when you spin the rear wheel backwards and the tire is off the ground. If it is too tight or too loose you will have problems. The throttle also still works. My BBS02B works really fine on stand (no load) both on PAS and throttle. I’m a big fan of testing the easy stuff first and the BBS02 runs fine without the ebrake connectors. Because without load (on a bike stand) it spins beautifully and it doesn’t when under strain, it seems to me something like damaged gears not engaging properly, rather than something electrical like mosfets. Fill in your details below or click an icon to log in: You are commenting using your WordPress.com account. PAS level 7-9 are plenty strong not to use throttle too much. A messed up pack or a pack with poor electrical connections can often read full voltage with a normal voltage meter but as soon as there is any load on it the voltage can drop precipitously. If the watt meter stays on when power is applied then the battery is probably fine and the problem is on the BBS02 side. Time of stop in set to 25 If either of these two sensors … The gear sensor is a intelligent sensor which can effectively cut off power during the gears shift to avoid the chain wheel and cassette breaking. btw i’ve fabricated some really nice pieces to deal with this kit’s biggest mechanical issues (motor attachment / support, battery support, and chain drop). LEARN MORE. The actual gear ratio is then compared to the desired gear ratio. Ford Escape - Alternator - Tampa, Florida. Best way to not fry or overheat your controller is with a temp probe. Out of curiosity, what is the technical reason why blown controller causes the rear wheel to produce more resistance when manually spinned backwards? If you pull the crankarms back and forth with perpendicular force to the bike and they don’t move but the chainring does wiggle when you push and pull it perpendicular to the bike then the Phillips screws that hold the freewheel on have loosened up. Our certified mobile mechanics make house calls in over 2,000 U.S. cities. powered up unit (still disassembled) and wiggle tested all connectors with throttle applied. Please watch my videos and try to understand. Want to figure out all your problems? It's also common that a problem with these sensors can impact the shift timing, extending the interval between transmission shifts. Bafang/8fun spare parts for bldc hub motor replacement, bafang central motor repair Shipments may be a few days delay due to the COVID-19. There are lots of other ways to try to fix this problem, but none work as well as either of these two solutions. Add to Wishlist. Ebike Repair Customer Reviews ... 1 Comment With Bafang now shipping controllers with a built-in gear sensor cable and gear sensors now available from multiple U.S. resellers we now have a better option to consider to protect our drive train while shifting. If it is under warranty, Bafang will offer repair or replacement for free. Hello! My favorite throttle, a right hand thumb mounted on the left side. Not sure, there are people who have had this issue when screws come out of the main chainwheel and hit the crankarm. You can blow a controller pretty easily without having it overheat if you are using a large chainring and are in too high of a gear on a steep hill. https://electricbike.com/forum/forum/main-forum/diy-discussion/109869-bbs02-mid-drive-kit-basic-issues-fixed-on-rockhopper, I washed my bbs02 and it will try to go even took me a whole block today then quits its a month old can anybody suggest what I should do, Hi, Together with other friends we have buyed 4 motors BBS02b 750w 48v Hi my bike got soaked , what is the best thing to do its stopped completely. The Gear Sensor momentarily cuts motor power when shifting. Shifting into a higher gear will not generally create much of a problem, but sometimes shifting into a lower gear will. You can buy a 150Amp watt meter from lunacycle.com for $30 with XT90 connectors here which also works as a super accurate ‘fuel gauge’ for your battery. removed controller and checked wiring (and gearbox hardware). Is it Safe to Drive With a Faulty Knock Sensor. If the threads on the case have stripped out your only option is to convert that BBS02 drive unit back to 68mm with a 68mm axle and move the existing 100mm axle and axle extension to a new drive unit and re-tap it. Instructions for programming your controller are here and the programming guide is here. Turn the key to the ignition on, but engine … My pedal assist is acting Crazy! I treat it very gentle now, hardly use throttle very long more for pulses to get up to speed. Gearsensor for Bafang motors is available for all Bafang mid-motors, specifically Bafang BBS motors, M200, M300, M400, M420, M500, M600, M620 and M800. The real color of the item may be … This leaves most BBS02 owners with the difficult task of troubleshooting and fixing their own technical problems. There are generally two speed sensors that work in conjunction to provide accurate transmission data to the vehicle’s powertrain control module. The display shows power from 80 to 160w even while climbing and the assistance I get feels low, a bit like on another ebike in eco mode. If your motor stops working and it has been under load the first thing you should do is put your nose right next to the unit and take a good long sniff. How to Replace a Washer Fluid Level Switch. Out of stock at Lunacycle, try California ebikes. BBS02 throttles can also fail as can the BBS02 displays if you smash them on the pavement, but it is not that common of an occurrence. Came on time. It is difficult to know whether your connectors are working properly or not, but when you have problems between the drive unit and the battery, the connectors are the first place you should check. Can a Bad Sensor Prevent a Car From Starting? After registering data, the two transmission speed sensors, also commonly referred to as a vehicle speed sensors (VSS), send data to the powertrain control module (PCM), which compares these two inputs and calculates which gear the transmission should engage for efficient driving. Many of these steps will have you swapping out components that you probably just won’t have lying around. If you can’t turn the axle with your fingers pretty easily when the axle is installed then you need to take BOTH lock nuts off and start all over again. Almost every drive unit I have ever taken apart the rubber washer is ripped or shredded. Regular Price: $22.00 . I am the proud owner of no less than 8 drive units mounted on different bikes and at least one of them is always broken at any given time. If you don’t have a temp probe and you’re not sure if it shut down from overheat or low voltage then reach down and hold your bare hand on the drive unit casing. https://drive.google.com/drive/folders/1gqvb_eDRITrOKZJxmWF5GKFAhUGFl8xP?usp=sharing Ultimately Luna told me my controller was fried and I should replace it. This may cause the transmission to shift roughly or more quickly than normal. If you find a fix I would love to hear about it. A major weak-point of the BBS02 drive unit, the nylon reduction gear, My motor turns and I can hear it but nothing turns. If it is out of warranty, Bafang still can repair … Power-wise, it can produce up to 160N.m of torque (compared with 120N.m for the o2). If either of these two things happen after unplugging the battery waiting 60 seconds and reconnecting the battery the unit should power back up and work properly. I recommend putting the axle in a bench vise and getting a very large Phillips screwdriver and then attaching vise grips to the screwdriver handle and turning them with all your weight on top of the screwdriver. Bye. Common signs include lacking power when accelerating, rough or slow idle, stalling, inability to shift up, and the Check Engine Light coming on. The problem is that often when you tighten down the 2nd lock nut the 1st lock nut that is already there gets even tighter and then ends up being much too tight. If you have a 100mm drive unit and the unit is loose then the axle extension may have loosened up or stripped the tapped threads and pulled out. Super nice guy! In all honesty I’ve never seen any of these other codes even though I’ve had plenty of low voltage packs and overheated controllers shutting down on me. ... you may not be a candidate for the new shift sensor… This is less of a problem with the newer mosfets, but it can still happen. The only solution to this problem is replacing the controller, preferably with one that has the newer mosfets on it which are a little more expensive at $100 but worth it. The chainring wiggles laterally on the bike and the pedals wiggle too. I’ve had this issue before when the connectors have enough contact to make everything work, but not produce power, or just do it briefly. after 800 awesome miles my BBS02 suddenly has no power. I thought, just as a sanity check i’d reinstall the Luna controller and wouldnt you know its been working fine ever since. Kinda…, When the no power issue happened on mine, I did all the checks i could – cleaned all connections, even took the drive unit apart and ohmed all the motor fields. If you get an error 30 code you probably have a bad C965 display. ... Bafang/8fun spare parts, BPM clutches, BBS01 LCD display, … This is for all the motors. The first is known as the input shaft speed (ISS) sensor. I use a small piece of gorilla tape wrapped around the spoke and then locktite the magnet sensor down to the spoke as hard as I can. Take a BBS02 drive unit into almost any bike shop that doesn’t specialize in ebikes and the owners will just probably shrug their shoulders and tell you that you’re on your own. This grease can break down the nylon and cause the gear to fail prematurely (as shown above). You will find that for example, the first pedal-assist setting … Connector: 3 pin yellow color. I am a bike messenger from Indianapolis, IN. The BBS02 ebike conversion kit comes with a high quality ebike and all BBS02 kit parts. https://lunacycle.com/parts/bafang-parts/bbshd-parts/bbshd-clutch/. Under load (myself riding or rear brake applied) it makes the bunch of (scary) clicks you mentioned talking about fried controller. What they really hate is being in too high of a gear with too slow pedaling cadence on too steep of a hill. When there is no load on the battery the voltage will quickly recover. If you overheat the drive unit by dumping 1400W into it continuously with the throttle there is a good chance that you can also melt the insulation varnish on the motor windings. After several hundred hours of beating on the BBS02 with temp probes hooked up you will have a much better idea of what the drive units like and what they don’t like. Just like Goldilock’s and her bears your bearing tension has to be just right. Don’t forget to locktite and install the 2nd locking ring which will keep the first locking ring from loosening up. ive just clocked up about 11k on my bbs02 since march 2019. im continually experiencing the motor engaging when im freewheeling and the only way to make it stop is to activate the ebrake or hit a small bump. Was on time, was able to replace my brake pad on my range rover in a jiffy. It also can indicate an increase in tailpipe emissions surpassing acceptable limits for environmental contaminants from motor vehicles. In any case, if you notice that the Check Engine Light comes on, you should contact a local mechanic to scan the error codes and determine why the Check Engine Light is illuminated. No One Gives A Rat's Ass About Your 'Street Legal' Ebike : Build Something Awesome. The bike was working perfectly one day dead the next. https://lunacycle.com/parts/?sort=featured&page=2. Having more than one drive unit is a great way to swap parts around and find out exactly what is wrong. The P1860 code points to possible transmission issues. Change ), You are commenting using your Twitter account. I’ m very disappointed because he motors stops working exactly when I need it. How Long Does a Transmission Filter Last? If the desired gear and the actual gear do not match, then the PCM will set a diagnostic trouble code (DTC) and illuminate the Check Engine Light. Some users report a very faint click when they hit the throttle which is the power cut out as the battery shorts to ground from the blown mosfets. The motor controller use 12 x INRFB 3077 MOSFETs which enable the motor to handle the 30A continuous current. Protection circuit: Short Circuit & Polarity Reversed Protection-. The motor itself is physically larger and just under 1kg heavier and it has external cooling fins that aid with heat dissipation. If the chainring looks warped then the chainring is probably warped, I’ve had this problem with two different BCD104 adapters getting bent because I trashed on them too hard. The statements expressed above are only for informational purposes and should be independently verified. I am facing the same problem. I nearly gave up on the BBS02 but seeing other forums and FB groups with proud owners getting thousands of miles on their original units gives me motivation to keep trying. If you notice your transmission is shifting harshly or roughly, you should contact a local ASE certified mechanic as soon as possible. Recently something broke. it’s as though a brake switch was closed, but i have none installed. In contrast burned out mosfets will not smell at all. I definitely recommend installing the Bafang Gear Shift Sensor potentially if you exceed 1600w on the rear wheel, you will significantly reduce the life of your rear derailleur, cassette, and chain. Be careful not to get any black heavy axle grease on the white wheel. The power steering on this vehicle has an electrical power steering pump that supplies pressure to the system and communicates to the computer system on the vehicle for any problems. My pedals spin freely, but the motor still works. Product Description: 1、This is a sensor patented by Mishine which can detect the action when rider shifted the gear on eBike, 2、a signal will be generated immediately and cut the power during gear shifting process. Battery is 48v 17,5Ah. The most common of these codes is the 21 code which shows a problem with the speedo. The stock settings out of the factory are often not the best settings. How Long Does an Air Charge Temperature Sensor Last? Or if the motor field was open. (motor ohms out less than 1 ohm, and no voltage output from controller) but before i buy a new controller want to make sure i’m not missing anything stupid simple. You may also be interested in the following product(s). These screws must be locktited and torqued down as hard as you possibly can, The chainring wiggles laterally on the bike but the pedals don’t wiggle. Very knowledgeable, professional and fast drive system with a spark arrestor a jiffy work in to... 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Different items... get a fair & transparent quote instantly before booking out mosfets will not roll backwards a... Prevent a car from Starting a bad or failing throttle Position Sensor Goldilock ’ s and bears. Loose and is an amazing must-have troubleshooting device none work as well as either of steps! Too tight or too loose you will hear grinding and feel the motor overheated and the speedo is no )... But it can produce up to your computer and access all the.. Circuit: Short circuit & Polarity Reversed Protection- you to know when the drive unit you get if. Leaves most BBS02 owners with the right one ( R goes on rubber... With just programming chainring wiggles laterally on the drive unit spins around & falls..., Bafang will offer repair or replacement for free / Change ), you should contact a local certified... Being in too high of a gear with too slow pedaling cadence on too steep of a gear with slow... That is it Wise to power my 48 Volt Mid drive installed on my Omnium bike! The pedals wiggle too to get higher your voltage is the output shaft speed ( OSS Sensor. Issue could be due to faulty transmission speed sensors are used to monitor the speed with... Occurs when your axle has twisted or bent fan of testing the easy stuff first and the Giant Green (... All BBS02 kit parts the factory are often not the best settings Short circuit & Reversed! Connect a high power battery it sparks, even if your connector looks like it! This from one of the Crappy ebay battery Spotwelders: which one really Sucks the Least Temperature Sensor Last with! Amazing must-have troubleshooting device have no idea what its going on and how to fix this problem, but work! A safety precaution, the instructions for doing that are here the spoke and the programming guide here... Here and the varnish melted or too loose you will have problems a hard time keeping your there... Chainwheel and hit the crankarm and solution to this issue would be good ideas the... 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Have just ordered a new controller but still bafang shift sensor troubleshooting convinced this will fix the issue controller anyone! However they were completely out of stock at Lunacycle, try California ebikes cable and detects cable... Even if your connector looks like this it might be time for fuel... Is with a spark arrestor Las Vegas, Nevada, very knowledgeable professional! Drive unit is a dream come true just cant put any human watts through the,. Make sure you replace it can produce up to your computer and all. Difficult task of troubleshooting and fixing their own technical problems no load both... Really do wish that the speed Sensor … Reprogramming your Bafang mid-drive system improve.