I have a problem with my TPS. I checked the voltage and resistor values according to the service manual and this looks good so far (Voltage coming from the ECU, resistor values of TPS when moving the throttle are also were they should be), but I get no voltage on Pin 2 (the TPS signal itself). I'm "a bit" confused about that. I mean the TPS is working (changing resistor voltage), but there is just 0 V as output signal. I have a spare TPS (bought as working) which shows the same behaviour.

 

Had anyone similar problems or an idea what could be wrong?

Do you have a 3 wire or 4 wire type?

 

On a 3 wire, most of the time one of the ends is 5V, the other end is ground. Middle pin is signal varies from about 0.5v at closed throttle to about 4.5v at wide open. There can be exceptions where the pins are mixed around.

 

If you have a 3 wire make sure you have 5v at the sensor.

Also, do all testing with the meter grounded to the battery -.

 

 

On the 4 wire type the extra pin is a switch contact and will read 5v when the throttle is closed. This pin could be on one end, or could be in the middle, depending on who made the sensor. If the sensor is not adjusted properly you will not get voltage on this pin because the contacts never close when the throttle closes.

The other 3 pins act the same as a 3 wire unit.