TPS swap

[Aidjay]

After my recent annual service, the TPS is not being detected by the diagnostics check. It has been suggested I replace it.

Is replacing the Throttle Position Sensor as simple as removing the old one and putting in the new one? Does there need to be any post-installation diagnostics done to it?

 

[Welshman]

After my recent annual service, the TPS is not being detected by the diagnostics check. It has been suggested I replace it.

Is replacing the Throttle Position Sensor as simple as removing the old one and putting in the new one? Does there need to be any post-installation diagnostics done to it?

Just reset the voltage, dead easy...

 

[Aidjay]

Just reset the voltage, dead easy...

Can you elaborate?

 

[Timolgra]

Use a paper clip slid up the wire on terminal 1 and 4 to make a contact and with a volt meter (ignition on, throttle closed) set the voltage to .371 by turning the tps, it will alter as you nip the two screws so recheck.

 

[GARAGE HERMIT X2]

is the bike running ok,?

 

[Aidjay]

The bike is running *mostly* ok, just generally a bit rough and very occasionally cuts out at low revs. Took it to Steptoe for an annual service and he recommended replacing the TPS when his diagnostics tool could not read the TPS at all. I'm considering replacing it, but just want to know if it's a simple plug-and-pray exercise, or if further diagnostics and settings need to be applied once this is changed over.

 

[Welshman]

Use a paper clip slid up the wire on terminal 1 and 4 to make a contact and with a volt meter (ignition on, throttle closed) set the voltage to .371 by turning the tps, it will alter as you nip the two screws so recheck.

Mine has self amalgamating tape stopping me going this route i slip in a couple of single core wires to terminals 1 and 4 and close it up to set.

 

[GARAGE HERMIT X2]

i'd check the connection's to and from it first, check the wiring for break's, and check the TPS with an avo meter to see that the resistance change's smoothly through it's full sweep (un-plug it to check), befor i'd pay for a new one i'd make sure it was dead,

 

[Fanum]

i'd check the connection's to and from it first, check the wiring for break's, and check the TPS with an avo meter to see that the resistance change's smoothly through it's full sweep (un-plug it to check), befor i'd pay for a new one i'd make sure it was dead,

....and check slack in the throttle cables, the little rubber caps under the throttle bodies that you take a vacuum reading from, the balance and your spark plugs, ESPECIALLY if you have a later twin spark model.

PS if and ONLY if you decide you need a replacement TPS unit, I still have one spare from the big box of assorted crap that I used to lug around Morocco for people

 

[Nick591]

Adding to this thread, when adjusting TPS recently one of the bolts was v tight and ultimately the pesky head snapped off :-(. I removed the other adjustment bolt to remove tps and get some grips on the thread of the old bolt but for some reason I couldn't pull the tps off the throttle body. Am I missing something? How do I get the tps off? Thanks for any advice, Haynes manual no help on this.

 

[cele0001]

You probably have corrosion or trash in between the bolt (whatever is left of it) and the body of the TPS. Probably the reason that bolt head broke in the first place.
Gentle touch and penetrating oil are your friends.

 

[Nick591]

Thanks cele but the problem is not between bolts and Tps. The Tps doesn't seem to want to come off the throttle body no matter how much I twist and pull. I'll try some wd40 on the joint -it could be a stuck o ring. I found a post by Timolgra that said it just pulls off.

 

[hops]

Thanks cele but the problem is not between bolts and Tps. The Tps doesn't seem to want to come off the throttle body no matter how much I twist and pull. I'll try some wd40 on the joint -it could be a stuck o ring. I found a post by Timolgra that said it just pulls off.

It's definately just a push fit, I swapped mine some time ago, it was fairly tight though if memory serves me.

 

[Nick591]

Thanks hops