VVTi Fly-by-wire throttle position sensor calibration (การปรับ Sensor ลิ้นเร่งไฟฟ้าของตัว VVT-i เทอร์โบ)
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I've got an issue with my new car...
Basically when I'm driving at low speed the engine check light can come on and the throttle stops working!
It still idles fine so the Idle control is not at fault.
But I lose the Fly-by-wire controlled part of the throttle (about 80% of the travel does nothing and the last 20% is a quite uncontrollable as it then does the full range of throttle position in the last inch of pedal travel!
Anyway, I was told about this before I bought her, it's down to the calibration of the Throttle Sensor on the throttle body. The unit has been replaced and now throw's a wobbly - though less of one than it used to do.
So, does it need calibrating - if so how? Do I just need to reset the ECU (which couldn't hurt anyway)? I tried the full electrics, engine off, hold the throttle flat to the floor for 2mins calibration trick and that didn't help. Should I try that again after an ECU reset...the ex owner mentioned something about using a multimeter to calibrate it!
***UPDATE***
Throttle position sensor:
When not working:
Pin 1 = +5v
Pin 4 = gnd
Pin 2 - 0.66v closed throttle, only changes when the throttle is opened enough to mechanically move
Pin 3 - 2.36v @ closed, only changes when the throttle is opened enough to mechanically move
When working:
Pin 1 = +5v
Pin 4 = gnd
Pin 2 = 0.63v closed to 3.75v open
Pin 3 = 2.36v closed to 5v at mechanical link
Disconnecting either the TPS cable or the other one causes the failsafe mode. The engine doesn't have to be running for the problem to happen, no bumps or jolts or loose wires either.
Terry can you please check this against yours?
Also, on full electrics/engine off do you get any noise out of the throttle area? I'm getting a buzz/hum and a when you push the throttle open it clicks as it opens....
Ideas please! How do you get the error codes out of a VVTi? As it seems to be disabling the Fly-By-Wire and going into a failsafe/limp home mode.
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