Set your meter to 10kΩ. As you open the throttle plate, the digital multimeter should increase to 5 volts. After that I was able to hook up the multimeter with the TPS connector cable and adjust the TPS to .650-.660 volts as described in many forums (and by the cable manufacturer). What you will need: 1. This feature is dependent on the throttle valve. The voltage should fluctuate between 0.1 and 5v depending on the engine load. Still, I now have some reference figures.) You basically screw the sensor enough so that you can still move it around. The contents of this tutorial at a glance: Symptoms of a Bad Throttle Position Sensor. Then use the idle adjustment screw to adjust idle voltage. Here are the contents of this tutorial at a glance: Symptoms of a Bad Throttle Position Sensor (TPS). Should be about 0.49v @ idle, and 4.5v @ WOT. If the multimeter displays a negative number, for example, the probes are most likely in the wrong place. Open and close the throttle a few times to check the idle setting is stable and adjust if required. The FSM procedure is to set where the IPS opens and closed in relation to throttle shaft opening. I then was able to reset it to approx. Wire Colour & Purpose P= +5V reference Y= TPS position signal to ECU BR= TPS idle switch BK/DB= sensor ground. TPS is a fancy new name for the old three-terminal potentiometer that is commonly known by many different names. If you are lucky enough to have a scanner (Auto XRay Scanner) and know how to incorporate this into this adjustment, by all means … go right ahead! TPS adjustment. ... You can adjust the position of the TPS with a multimeter but you need to know what value is stored in the ECU to set it up correctly. - Tighten tps sensor down & adjust idle setting screw shown in the pic below. The multimeter range has to be set to the correct maximum voltage for the circuit in order to get the most accurate result possible. Set this reading to exactly .700 , this is done by loosening the 2 screws on the TPS sensor which is on the MAG side throttle body. In this tutorial, we're gonna' test the throttle position sensor part of the TPS assembly. You either have to get k-pro, or spend $20 and buy a multimeter. When you press down on the gas pedal, your throttle body unit's valve opens. To hook the multimeter up you will have to pierce the green wire (red arrows) with a pin so you can check how much voltage is going through it. Using the TPS test tool, verify the TPS is set to 0.70 +/- 0.01 Vdc. Connect ohmeter to 2 bottom pins (BR and BK/DB) and you should get continuity. Minimum differences in TPS position make big changes on TPS tool readings. Disconnect 3 wire harness. If you have a logger that will show the actual value of the idle position switch then you can use it to replace the multimeter for measuring continuity. The TPS set up routine reads the mv value of the TPS with the throttle closed and stores this value in the ECU as the baseline for the fuelling. There's really no other way to do it without the multimeter. How the Throttle Position Sensor (TPS) Works. Let's take a look at what your test results mean: CASE 1: The multimeter registered 4.5 to 5 Volts.This is the correct test result and confirms that the fuel injection computer and the circuit is supplying the TPS with power. Car does not have to be running, but ignition needs to be on to get 5v feed going to tps connector. This is a very touchy adjustment and your reading will likely change slightly when you tighten the screws back up, you need to compensate for this change when adjusting, it needs to be .700 when tight. If you removed the throttle linkage rod (6), refit it now. First set airbypass screws to 0 by screwing all the way in. ... All you need from the tools is a multimeter. Tighten 2 screws. The multimeter should display 4.5 to 5 Volts on its screen. TPS Adjustment Procedure and Testing Procedure - Coming soon IAC Test Procedure This is the Throttle Position Sensor Adjustment Procedure. Carefully tighten the screws to 31 In.Lbs. How to Diagnose a Throttle Position Sensor with a Multimeter Using a multimeter one of the best ways to determine if a TPS is defective, and even a inexpensive multimeter will do. To make your voltage adjustment, loosen 2 small screws that hold clamps that hold the tps. Screw Driver (Philips) 3. TPS Adjustment procedure Short Version.....adjusting the idle voltage (1) Find the yellow wire leading to the TPS and carefully pierce the insullation with the positive lead of your multimeter (make sure that you seal that bare spot when finished). To adjust the TPS base-line, slightly loosen the screws, then slowly turn the TPS clockwise or counter-clockwise to adjust the voltage. The red or positive (+) wire on your multimeter will go to the pin in the green wire. As long as the connector is attached to the TPS during measurement. Picture 2 To hook the multimeter up you will have to pierce the green wire with a pin so you can check how much voltage is going through it. Either my multimeter is off, or there's some additional resistance in there. 6. How to Adjust the Throttle Position Sensor Before adjusting the TPS make sure that you do a carb sync and set the idle speed beforehand as this could effect the reading. And even a malfunction of the smallest of them can lead to very serious consequences. go back to the engine bay and loosen the two philip screws that hold the TPS on the throttle body then and tighten until snugish, turn the TPS left to right while waching the multimeter you want it to be .50v. Circuit (Wire) Descriptions of the TPS. This is a pretty simple test that can be easily be done with a multimeter. The throttle position sensor (TPS) can be tested using a simple multimeter and in this tutorial I'll show you how in a step-by-step way. Dave Ex HVUK, Aug 10, 2011 #6 I fired it up basically cold and the idle was much better and smoother than before but seemed like it was just a tad too fast. You need a good digital multimeter to set TPS ( Throttle position Sensor) and a good set of Vacuum balancer guages or carbtune sticks. It is nothing more than a variable resistor and can be checked with Digital Multimeter (DMM). Maybe enlarging slightly sidewards the original Duke 390 TPS fixing holes with a Dremel or a drill (carefully) should provide more than enough room to do the adjustment. Throttle position sensor. TPS Adjust (mechanical) Engine off. To test the TPS you don't need a scan tool (although having one is major plus). If the digital multimeter reads between .2 to 1.5 volts, then the throttle position sensor is working correctly. 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