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Fuel Fuel Delivery

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  • 2 Post By BRod
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June 18th, 2017, 12:20 AM   #1
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Alan's Avatar
Joined: Jul 2016
From: Australia, Beechworth, Vic.

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I Ride: when I can which isn't often enough. FX450, FE570
Tps adjustment

G'day all,

On my FX450 and FE570 I don't have an on/off ignition switch. Any ideas how I can check my TPS posiition like this?


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June 18th, 2017, 01:17 PM   #2
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From: Pacific Northwest

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I Ride: '10FX450-sold,'08KTM 690SMR(SOLD),'12KTM250SXF(SOLD) '16 Husky FC250 SMracebike,'14Triumph Thruxton
You have to do it with the engine running.
Put a "Y" jumper between the TPS and the plug and look at the voltage.
Tiny moves on the TPS make big differences in the voltage.
Search Google or YouTube for "how to adjust TPS" for KTMs. (Same as the Berg)

If you can't or don't want to make your own jumper, there's a Suzuki TPS jumper/mini harness/"Y" that works.
I found a guy online (the name escapes me at the moment) that makes them as well.
Good luck!
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June 19th, 2017, 07:33 AM   #3
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From: Somewhere in Minnesota

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I Ride: '10 FE570, '00 RC51
There is a way to have the ECU provide 5V to the TPS without the engine running. There is a 6 pin service plug located under the seat. Placing a jumper across (I believe) pins 5 and 6 will do this. I don't have the wiring manual handy but can verify tonight if you don't have access to the wiring diagram. I then put a sewing needle adjacent to the wire coming from the TPS, going into the ECU. Again the wiring diagram will be handy for verifying the wire. The sewing needle should be run adjacent to the wire going into the ECU plug, not needing to actually penetrate the wire insulation. Connecting a voltmeter to here and then to ground will give you the reading for the TPS. No additional harnesses are needed.

Update: the pins in the diagnostic connector to jumper are 5 and 6, or white-black and brown. The wire from the TPS output to the ECU is in position #5 and is yellow.
Thanks from jon andersson and Blutor

Last edited by BRod; June 19th, 2017 at 07:41 PM. Reason: Updated information
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