Openthe throttle plate a little at a time while keeping an eye on how the multimeter's readings change. As you open the throttle, your multimeter should show an increasing value over time. The multimeter should also show 5 volts (or 3.5 volts in some TPS models) when the plate is fully open. Step3 - Remove the TPS sensor. Figure 5. TPS. Figure 6. TPS. Make sure to remove the TPS sensor and 2 screws that connect to bottom of throttle body. Once the old sensor is off, replace it with the new one. Clean the throttle body really well, then install it back by reversing the steps above. theday before that finding out that the codes were showing the bad throttle position sensor and egr valve (which i have already replaced with a new egr valve from advance auto parts) the oem ford one was way more expensive, i also changed the position sensor on top of the egr valve causing the check engine light to turn on, so i put the original one back on the new egr valve and it caused the 1 Throttle Position Sensor (TPS) - It's mounted on the end of the throttle shaft. It acts as a variable resistor (potentiometer)which varies the voltage to the ECU based on its position. This sensor transforms the throttle valve position into output voltage to the ECU, which then tells the injection circuit to supply the correct amount of fuel Ifollowed the steps by first disconnecting the linkage on the #1 throttle body, and check the voltage between the orange and pink wires. The voltage was reading low so I made the adjustment to read .5 volts. (spec .5 - 5 volts). Only my DVM at WOT was reading 4 volts. Thereare other bad throttle position sensor causes, though. Faulty wiring can cause your TPS to behave poorly. A short in your electrical system can, as well. Even vibration caused by a vehicle that needs alignment can affect your throttle position sensor and cause it to fail. The truth of the matter, however, is that it's uncommon for a TPS Firstyou need to find out what the resistance should be set at. Then hook up your multimeter to the pins going to the throttle position sensor and loosen the adjustment screws. Pivot the sensor on its mount until you get the required resistence. Pretty easy. throtlesensor how it works and bad common cause Takeoff the rocker panel on the driver's side of your cart. Lift up the floor mat and look for a cutout on the floorboard. Remove the cutout and take off the screws from the pedal box. Find the inductive throttle sensor and remove its connecting screws. Place a new sensor in its place and replace everything you removed. 1 Check Engine Light The Check Engine Light comes on when the TPS sends an incorrect reading to the computer. Because the TPS is monitoring the throttle plate, any malfunction will be registered. eYdi.