[Diy_efi] Problem with TPS on aftermarket ecu

[Damian Long]

Hello,

gee its quiet in here.

I have a problem with my TPS and I'm running out of ideas. Perhaps someone else on here knows whats going on.

The TPS is not reading correctly in the ecu. The ecu is a Walbro BIKE400. Probably haven't heard of it but thats not real important as it uses basically the same principals as most ecu's when it comes to TPS.

I have wired the TPS correctly. It is a standard GMH 3 wire TPS. +5v, GND, TPSsig.

The throttle movement is correct. I could calibrate the opening 0% and 100% without problems. In the datalogging software, the throttle movement works correctly. WOT logs 100% throttle etc. The problem is that the 'dthrottle' value does not change. It remains at 0 with the occasional movement to 1 or so. Just like little blips of interference (noise). Basically the ecu thinks that, although the throttle is moving, there is no change. The result is no accellerator enrichment. 

If anyone knows why it is doing this, it would be a great help.

thank you

Damian

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