Checking and Clearing DTCs

Hey, welcome to fix my hog. My name is Steve Noble. Today we've got our M eight soft tail low rider ST up on the lift. This is a 2022 model. And what we're gonna do today is we're gonna take a look at codes. Uh These are codes that come on when you get some type of a warning light, whether it be an engine light, A BS light, something like that, these can randomly come on and sometimes your bike seems to run fine even though there's engine light on, but you don't have to send it right to the dealership to find out what the problem is. There's a procedure you can use on the handlebar controls that will show you exactly what code it is. And uh you can then take that code, put it into your phone and you should be able to find out what the problem is. Then from there, you can decide the best route for repair. So to get a code to happen on this bike first, I unplugged the front 02 sensor. Now, the bike wasn't up to temp yet. So it didn't, it wasn't in what's called closed loop and it wasn't actually reading on the 02 sensor yet. So I didn't actually get a code then. So then I went to the map sensor, which is the manifold absolute pressure sensor I believe is what map stands for. Either way it's measuring the amount of vacuum in your intake, but it's right on top of the intake. It's right about here. So I unplug that and lo and behold, that gave me a code or at least it gave me an engine light. So now from there, we're going to move into the hand of our controls and I'll show you how to read the code and then we will get online and we'll determine what exactly the code is. So let's take a closer look. So the low rider ST model and the street Bob have the gauges here in the dashboard or in the top clamp here. It doesn't have like a typical gauge or typical dashboard mount like in the tank or mount up here. So in order to do it on this bike or really any other bike, but we're gonna demonstrate on this one. What you wanna do is hold the trip button, then turn your bike on. So I'm gonna hold the trip button with my left thumb. You'll even see the thing lights up or the dash lights up, then we're gonna turn the bike on, just turn the ignition switch on. We're not hitting the start button yet. Uh let off the trip button. Now we're in diagnostics so I can then cycle the trip button and it's gonna go through and like right here it says Ecmy. That means yes, there is an ECM code, hit it. But again, BC M is a no Speedo no A BS unit is also no. So my ECM is the one that is giving me the code right now. So what I'm gonna do to actually read the code is then hold down the trip button. Yeah, and there my first code is P 0113 C. I'm gonna take a picture of that so I can remember it. So if you're like me, you'll forget that in seconds. Now we're gonna hit the trip button again and we're going to see if there's other codes. Ah P 0108 C and then it says end. So that's the end of the codes from there. We can turn the bike off, get on the search engine and find out what those codes are to look up your codes. You wanna refer back to your service manual. I have part of my service manual downloaded to a PDF and I put it on my phone that way, I always have it on hand when traveling. It's pretty handy. So let's look at our two codes that came up. First one was P 0113. That is the IAT voltage open high, I believe that's intake air temperature. I think that's what IAT stands for. Uh Either way, that's probably a product of the unplugged map sensor. And of course P 0108 that is a map sensor and it's listed as map sensor failed high slash open port. Also being known as I unplug the map sensor. Hopefully you can see this, that is the map sensor and it is unplugged. So we are going to plug it back in. I'm sure you can't see much with my hand in the way, but push it back in there till it clicks. There's a little black, a little gray plastic piece on top, push that down till it clicks. Give the plug a push up, make sure it stays on there. All right, we have now reset the problem or repaired the problem that caused the codes. So let's take a look at how to reset the codes. So the map sensor is plugged back in. So now we have two options for resetting the engine light. You can either a do absolutely nothing since the problem has been repaired. When you start the bike up and ride it, it should run as it did before because it's reading that info from the map sensor. However, the engine light is gonna stay on for three full heat cycles of the engine. So that's from when you start it up cold and it heats up and goes from open loop to closed loop where it's run on all the sensors. It's gonna want you to do that three times before the ECU is satisfied that the problem has been repaired. That's the easiest way to do it. If it really bugs you that it's on, there is a way to reset it uh with the buttons on the handlebars. So let's move in a little bit closer and we'll look at that procedure. So to reset this engine light using the handlebar controls, we're gonna do it the same procedure as we did initially to check it out. We're gonna hold down the trip function and see it lights up. We're gonna turn the condition on, still holding the trip function. You're gonna get to diagnostics so we can let off press the button again. ECM Yes, because there's a code because the code's still there. Hold down the trip button. P 0113. So we are going to hold down the trip button and it should clear out the code. It says clear. Now when we press the trip button again, switches to ECMN as in there's no codes, BC M no Speedo, no A BS, no all is well and good. You can turn it off to get out of diagnostics and then we turn the bike back on, make sure it's a neutral, start the bike up. As you can see the engine light is off. We're ready to go ride there. You have it, codes are reset. And we're ready to go ride. As you can see, you don't need the dealership. You don't need any special tools to do this. You just need to know the proper technique or the proper procedure and having a service manual available is always handy. So that's all I have for you today. My name is Steve Noble. This is Fix My hog and thank you for watching.