[XJNick]

Originally Posted by akorna

Signal voltage form the TPS with the ignition off is 0.78 votls (within the 0.26-0.95 volt range.

This doesn't make sense -- there should be no power present at the TPS if the ignition switch is OFF.

The correct working range of the sensor is 0.8 - 4.8 volts.
This means with the throttle CLOSED you should read 0.8 volts.
This means with the throttle WIDE OPEN you should read ~4.8 volts.

You need to adjust the resistance of the sensor at closed throttle so it outputs as close to 0.8 volts as possible. This is done by loosing the bolts and pivoting the sensor until the voltage is correct. ALWAYS do this adjustment with the engine OFF, but the ignition switch in RUN.

-Nick

	Throttle position sensor A throttle position sensor (TPS) is a sensor used to monitor the position of the throttle in an internal combustion engine. The sensor is usually located on the butterfly spindle so that it can directly monitor the position of the butterfly throttle valve. The sensor is usually a potentiometer and therefore provides a variable resistance dependent upon the position of the butterfly valve (and hence throttle position). The sensor signal is used by the Engine Control Unit (ECU) as an input to its control system. The ignition timing and fuel injection timing (and potentially other parameters) are altered depending upon the position of the throttle, and also depending on the rate of change of that position. For example, in fuel injected engines, in order to avoid stalling, extra fuel may be injected if the throttle is opened rapidly (mimicking the accelerator pump of carburetor systems).