Join Date: Jun 2010
Location: Olympia, Washington, USA
The control unit sends out a five volt reference signal from pin 29 to the tps. It's just a rheostat. It's grounded at pin 3, along with several other components as well as the ecm ground. Since you have injector click by opening and closing the throttle, we can safely assume you have a complete circuit. The third wire goes back to the ecm at terminal eleven. This is the one you want to pay attention to. This is the return voltage from the tps and tells the ecm what position the throttle switch is in. Generally speaking, with the ignition on, and the throttle at rest, the return voltage should be @ one half volt. (point 5 volts). As the throttle is opened, the return voltage should rise to around 4 to 4.5 volts. It should be linear and SMOOTH with NO drop outs. What happens over the years, is the tps develops open areas that the ecm can't read. Since it doesn't know what the throttle position is, it can't deliver the correct amount of fuel. I suspect you have a bad spot or two in your tps. Possible water in the connection(s). Notice there are two screws that can be loosened to adjust the tps, but in your case, a simple adjustment won't help. Verify your results and check back.
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