Rear TPS no feedback

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MDIORIO01

Joined
Jun 19, 2023
Messages
7
Location
PHILLY
Hello:
Posting in hear as no one had a feedback in the 899 section. I have owned this 899 for 5 years and have 10K on it. The bike started acting up rough idle, jerk down low in the revs, gut less over 5k. I purchased new Map sensor and replaced both. and still having the same problem. I can unplug the front MAP sensor for the rear cylinder and the bike remains unchanged. I swapped around sensors and still same problem. I checked line going to the map sensor and it looks and feels fine. The bike feels like the timing is retarded on it.

I than went deeper into the bike. I am not getting any feedback from the rear TPS sensor. I purchased a whole used setup and Throttles bodies and installed that TPS still same problem. The ECU is only picking up the FR TPS. I have power to the rear TPS. any ideas?

Thanks,
 
you havent pulled tank recently? disconnect both throttle motors and reconnect, check for broken down wires/connections in that area. do the throttles cycle when you key on? Key on with tank off and observe...

good luck buddy
JAG
 
everything was find till it started running rough. I took the tank off once years ago. yes the throttles blades do move. I wonder if the Tuneboy tune only picks up the Front TPS.
 
ah..so you have fuel controller....i'd disconnect that, and disconnect your battery for a few min, then try and start up with stock mapping. (i'm not familiar with tune boy myself, i use a handheld to flash my 1299...

how many miles you put a year buddy?

JAG
 
I am using the Tuneboy software to get feedback about the TPS position using my laptop. When I open the throttle I can see the blades open. The blade never go more than 37% open at Full throttle. I turn the bike off and see both TB blades open to 100%. I unhooked the rear TPS and used my hand to open and close the FR TPS and see it reading a steady 0-100% ranger. I than discounted the FR TPS and hooked up the rear TPS and I get no feedback from the sensor. It has two 5 volts power going to it. I replaced the REAR TPS with a used one. Still same problem. I emailed Tune Boy to confirm that his map would not disable the Rear TPS. I have the same tune for 5 years.
 
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When the bike is off both the front and rear TPS will go to 100%?

I think the 37% thing may be because the bike isn’t moving, it’s in neutral or if it is in gear the clutch is pulled in. Can you log or setup a screen recorder and see what it’s position is on a ride?
 
I'd be checking for continuity in the sensor wire. I haven't looked specifically for feedback, but I'm sure I was getting readings for front and rear. Run a multimeter for resistance between the ECU and TPS connector. If you've changed the throttle and no change, it only leaves the wiring loom.
 
Unless you saw a reading, in Tuneboy, from the rear TPS before your problem started your method is flawed.

Do you have another diagnostic tool which can read it?
 

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