ZR-1 Net Registry Forums - View Single Post

Franke · 07-23-2013

Schrade, since the TPS is a potentiometer it has 5 volts and ground from the ecm on the outside leads with the center lead as the signal wire. TPS signal voltage varies from about .54 volt at idle to approx 5 Volts at WOT.
According to the FSM the Blk wire is sensor ground from the ECM, the Dk Blu is the TPS signal, and the GRY wire is the 5 volt reference from the ECM. As you know the resitance should be linear so any spike/dip in Ohms is a problem as the voltage back to the ECM will fluctuate with the resistance. The solution is to replace the TPS as you probably cannot replace the guts of the TPS potentiometer. This is all from my 1990 FSM. Wire colors may be different on later years. Hope this helps.

07-23-2013	#2
Franke Join Date: May 2013 Location: Beaver, PA Posts: 515	Re: TPS response... Schrade, since the TPS is a potentiometer it has 5 volts and ground from the ecm on the outside leads with the center lead as the signal wire. TPS signal voltage varies from about .54 volt at idle to approx 5 Volts at WOT. According to the FSM the Blk wire is sensor ground from the ECM, the Dk Blu is the TPS signal, and the GRY wire is the 5 volt reference from the ECM. As you know the resitance should be linear so any spike/dip in Ohms is a problem as the voltage back to the ECM will fluctuate with the resistance. The solution is to replace the TPS as you probably cannot replace the guts of the TPS potentiometer. This is all from my 1990 FSM. Wire colors may be different on later years. Hope this helps.