John W
New member
- Joined
- Oct 20, 2004
- Messages
- 38
Well I put a new TPS in and the local dealer said to look at your other SRX and adjust it to about the same spot on the carb rack. That sounds a little lame but I did it, and I'm getting a error alert 2 long and 1 short. Thats the TPS, the error code says that the TPS is either disconnected or shorted out. this sensor is brand new from Yamaha. Is it just an adjustment? Can anyone help me on this one? I along with seven others are leaving tomorrow morning for Canada for a five day trip. Thanks in advance
Sounds like you have a bad connection or a broken wire. What caused you to get a new TPS? Was it the same error code?
Procedure for Adjusting TPS on SRX or Viper
Procedure for Adjusting TPS on SRX or Viper
- Make sure your idle speed is set first.
- Disconnect the TPS connector (Wiring plug that connects to TPS)
- Connect 3 - 1.5V batteries (C cells or D cells work great) in series (roughly 4.5 V) as follows . . . connect (-) lead to Terminal 1 (the terminal that normally connects to the Grey/Black wire when connector is plugged in), connect (+) lead to Terminal 2 (connects to Red/Yellow when connector plugged in).
- Measure the DC Voltage between Terminal 1 (-) & Terminal 2 (+). This will be the base voltage that the desired voltage is calculated from.
- Calculate the desired voltage by simply multiplying the base voltage in step 4 by 0.136. This will be the voltage that the TPS is set to.
- Loosen the TPS screws so that it can be turned but stays when you let it go.
- Measure the DC Voltage between Terminal 1 (-) & Terminal 3 (+) (terminal 3 is the terminal in the middle on the TPS).
- Turn the TPS until the voltage matches the desired voltage calculated in Step 5.
- Without moving the TPS, tighten the holding screws.
Last edited:
John W
New member
- Joined
- Oct 20, 2004
- Messages
- 38
I replaced the TPS because the one on the motor was broken due to a wrench falling on it. However, I also should have told you that if I hold the throttle open between 2500 and 3000 the error code goes off and stays off. Well we'll have to give that a try, the book (Yamaha) tells me that on that particular error code there is either a short in the wire or that the TPS is disconnected. Thanks for your help
Yamablue
Member
The TPS code will flash when the idle value is set below the valid range. I have this problem when I was setting my polaris 38mm carbs for the viper. I have mine set to just not flash. I think I may have to set it lower though and let the light flash at idle. I think the greater range of the polaris TPS is giving the EDU a higher WOT voltage causing it to advance the timing to much. I have had a problem burning down motors.
John W
New member
- Joined
- Oct 20, 2004
- Messages
- 38
Yamablu: That's what I did, started the engine and rotated the TPS slowly until it stopped flashing. And now it doesn't flash anywhere through the throttle range. Before it would flash at idle and high throttle, but it wouldn't flash between 2500 and 3000 rpm. I've got to get a little deeper into this. I just don't believe that Yamaha tells you to set it up with 3 D cell batteries, but it's in the service book, the guys at three Yamaha shops don't know anything about these . Even the Yamaha tech guy said to follow the directions in the book. Apparently he doesn't know either. Thanks for the info
Don't make this more complicated than it is . . .
There is a test connector that dealers equipped with the right power supply equipment are suppossed to use. All you are doing with the 3 batteries is creating a consistent and repeatable voltage supply that can be used as a reference point. Using simple ohm's law you can then calculate what voltage will give the desired total resistance of the tps. That is all this process is doing, and there are other ways to accomplish it as well. The 3 battery method is simply suggested by Yamaha if you do not have the test connector and other required test equipment because it is just that "simple".
There is a test connector that dealers equipped with the right power supply equipment are suppossed to use. All you are doing with the 3 batteries is creating a consistent and repeatable voltage supply that can be used as a reference point. Using simple ohm's law you can then calculate what voltage will give the desired total resistance of the tps. That is all this process is doing, and there are other ways to accomplish it as well. The 3 battery method is simply suggested by Yamaha if you do not have the test connector and other required test equipment because it is just that "simple".
vipertripplexxx
New member
yamablue,
I Think that the timming curve is most advanced at 1/2 throttle position (for mileage). after that it starts to retard the timming. With the bigger carbs 1/2 throttle is more like 3/4 throttle on the old carbs. So technically your running maximum advance with the motor loaded down more. 1/2 throttle with 38's will give alot more air, than 1/2 throttle with 33's. Maybe you want to go the other direction, so the maximum advance is at a lower throttle opening. This means you would need to turn up the position sensor voltage at idle, so you achieve maximum timming at about 3/8 throttle position,with the new carbs. Are you burning down at what throttle position? I'm not positive of this info on the curve, but I'm currentlly looking into a way of checking it. I'll keep you posted.
I Think that the timming curve is most advanced at 1/2 throttle position (for mileage). after that it starts to retard the timming. With the bigger carbs 1/2 throttle is more like 3/4 throttle on the old carbs. So technically your running maximum advance with the motor loaded down more. 1/2 throttle with 38's will give alot more air, than 1/2 throttle with 33's. Maybe you want to go the other direction, so the maximum advance is at a lower throttle opening. This means you would need to turn up the position sensor voltage at idle, so you achieve maximum timming at about 3/8 throttle position,with the new carbs. Are you burning down at what throttle position? I'm not positive of this info on the curve, but I'm currentlly looking into a way of checking it. I'll keep you posted.
John W
New member
- Joined
- Oct 20, 2004
- Messages
- 38
OK here it is directly from the horses mouth (Yamaha Tech Guru)
All ya need is your volt meter.
With the sled running at approx 1600+- rpm, There are three wires that come out of the plug that connects to the TPS. You tap the grey and black with the negative from your volt meter. Tap the green and yellow with the positive from the volt meter, with the sled running just turn the TPS switch to whichever direction you need to get to 0.75-0.80 volts. I needed to turn my TPS to the rear of the sled, mine was reading 0.41. That is the factory setting. When I asked about the D cell battery deal, well lets just say when he got off the floor from laughing he told me to save the batteries for my flashlight. My sled is a 2001 SRX, I'm not sure if it is the same for a Viper as I believe the timing is different than an SRX. And I'm not sure here but I believe that this TPS does change timing as you throttle up.
Hope this helps
All ya need is your volt meter.
With the sled running at approx 1600+- rpm, There are three wires that come out of the plug that connects to the TPS. You tap the grey and black with the negative from your volt meter. Tap the green and yellow with the positive from the volt meter, with the sled running just turn the TPS switch to whichever direction you need to get to 0.75-0.80 volts. I needed to turn my TPS to the rear of the sled, mine was reading 0.41. That is the factory setting. When I asked about the D cell battery deal, well lets just say when he got off the floor from laughing he told me to save the batteries for my flashlight. My sled is a 2001 SRX, I'm not sure if it is the same for a Viper as I believe the timing is different than an SRX. And I'm not sure here but I believe that this TPS does change timing as you throttle up.
Hope this helps