More Jeep 4. If you have this resistance value between PIN 1 and PIN 4, next you will be opening up the throttle plate to 100% wide open throttle. and around 4. Repeat Steps 2-5. 0L Test Tutorials. 6 volts at WOT ( wide open throttle ). Perform the test procedure again and wiggle and/or tap on the TPS while you watch the meter. Using the multimeter, check for continuity between the ground and the signal wire. To being working on your Silverado throttle sensor, you’ll need to turn the ignition to the “ON” position. 5v regulators https://amzn. For the TPS on 1996 and newer Grand Cherokee, go to: How To Test TPS Codes: P0121, P0122, P0123 May 29, 2013 · This test simply involves connecting your multimeter to the correct TP sensor wire and manually opening the throttle as observe the voltage reading the sensor is creating. Conclusion. This test result doesn't condemn the TP sensor as bad just yet. A. Jan 17, 2016 · In order to test the signal from your throttle position sensor, you’ll need to reconnect the TPS. Access the TPS terminals: Locate the TPS on the vehicle and remove the plug connected to it. Connect the red multimeter test lead to the gray with white stripe (or GRY/WHT) wire. 3- Check the reading of the millimeter and the correct reading should be between . Set your multimeter to DC voltage at 20V. Use a throttle body cleaner to remove debris and carbon buildup on the throttle body. To check if the battery is the cause of the issue: CASE 2: The throttle angle voltage DID NOT increase/decrease as you opened/closed the throttle plate. Pr Oct 21, 2023 · Locate the signal wire of the TPS. More 4. NOTE: The TP sensor connector needs to be connected to the TPS, so you'll need to either back-probe the connector or use a wire piercing probe to get to the signal inside the wire (to see Aug 20, 2022 · Step 03. 1K ohms, when at full throttle it should read 4. 0157in) thickness gauge between the throttle stop screw and lever. APPLIES TO: This tutorial applies to the following vehicles: Jun 23, 2014 · Before testing the continuity of the TPS circuits (wires), you need to first make sure that the TPS itself is OK. ) Connect the red multimeter test lead (using the appropriate tool) to the RED wire. Hall Effect Sensor Testing steps. Loosen the TPS mounting screws: Gently loosen the two TPS mounting screws, allowing the TPS to be turned In this video I demonstrate how to test for a bad throttle position sensor (TPS) with a multimeter. The TPS is usually located on the side of the throttle body, just above the accelerator pedal. Connect the positive lead of the multimeter to the signal wire of the TPS. The TPS is pretty easy to understand how it work’s, it is a potentiometer just like your dimmer switch in the dash. 5 volts. com). Once the TPS is securely in place, reattach the electrical connector to the sensor. It will be the housing attached to the engine block. If the TPS sensor output is outside of this range, the TPS sensor may be faulty. If the throttle position sensor is good, your multimeter will show an increasing voltage signal as you open the May 29, 2013 · 1. Disconnect the TPS from its electrical connector. Verify that the RED wire has voltage ( 4. 4. Feb 2, 2015 · One is to check that the TPS is getting power. Make adjustments the way I To test the throttle position sensor: Locate the throttle sensor and disconnect the connector. This tells the ECM you’re at WOT. Just put the tool to measure Ohms. 5L Toyota Tercel). This is due to the fact that the throttle position sensor is two sensors Mar 10, 2013 · Blazer Replacement Throttle Position Sensors (TPS) on Amazon - http://amzn. Jun 1, 2022 · Easy Steps to Test Your TPS with Multimeter. Nov 4, 2007 · 298 posts · Joined 2007. You can also use the engine ground instead of the negative battery. The TPS sensor can be tested with a multimeter. Multimeter used in Jul 12, 2010 · Connect the black multimeter test lead to the battery negative (-) post. 3L equipped Nissan Pathfinder (Frontier, Xterra or QX4) is located on the side of the throttle body. The throttle response was lacking as well. Now using your multimeter, pierce the BLACK wire or PIN B from behind the engine connector. Let's interpret your test results: CASE 1: The multimeter registered a smooth increase or decrease in voltage. 0L). To do this, check for diagnostic trouble codes first. Nov 8, 2022 · How do you test a 6 wire throttle position sensor? A faulty throttle sensor can cause OBD-2 codes. 3L Ranger or Mustang (Mazda B2300) works when you crank and start the engine: The fuel injection computer supplies power and Ground to the throttle position sensor. You could either connect up the. Then, use a digital multimeter to check if the sensor is functioning. This wire is responsible for transmitting the voltage readings to the vehicle’s engine control unit (ECU). The other is to check that it's Ground. Sep 9, 2014 · To check that the TPS is getting power, go to: TEST 2: Verifying Throttle Position Sensor Has Power. Take the black probe of the digital meter and connect it to the negative battery. If you've been wondering what the heck the TPS is for, it's job is to let the PCM know the throttle plate position (angle) as it opens or closes. 2. Step 1: Check the code reader. So here, in a nutshell, is how the TPS on your Ford 2. Examining the throttle position sensor with a multimeter. 38 and 0. 4L V6 equipped car (Buick, Chevrolet, Oldsmobile, Pontiac). TEST 3: Testing The TP Signal. To check that the TPS is getting power, go to: TEST 2: Verifying Throttle Position Sensor Has Power. TEST 2: Testing The TPS Voltage Signal. com/cars Dec 26, 2014 · To see the tutorial that covers the 1995 thru' 1997 throttle position sensor go here: How To Test The Throttle Position Sensor (1995-1997 2. Connect the red multimeter test lead probe the middle wire of the sensor's connector . Aug 14, 2013 · The key to diagnosing the your 3. With the throttle plate closed, adjust the TP sensor till your multimeter reads between 0. Have your helper turn the key ON, but don't start the engine (this will power up the TP sensor). Feb 4, 2016 · Testing your Silverado TPS Sensor for Power. This powers up the sensors in your engine bay, and now you can test your throttle position sensor. Ground the black multimeter test lead on the battery negative (-) terminal. Find the throttle body. Adjust the TPS Clockwise. You don't need an automotive scan tool, since all of the tests, in this article, are done with just a simple multimeter. May 7, 2024 · Now, carefully open the throttle pedal and check the voltage. The resistance or voltage of the throttle position sensor is the most usual test. TEST 3: Verifying TPS Has Ground. 5 volts, depending on the throttle position. Jul 21, 2020 · A bad TP sensor will show symptoms such as an illuminated check engine light, engine and transmission performance issues, and the vehicle being stuck in limp mode. Lightly tap on the throttle position sensor (TPS) with the handle of a screw-driver, while you rotate the throttle open and then rotate it back to its closed positions. PART 3: 10. To test the TPS sensor, connect the positive lead of the multimeter to the TPS sensor Mar 29, 2016 · To test this insert and turn your ignition key to the “ON” position. Mar 10, 2012 · The throttle position sensor's job is to measure the angle of the throttle. This is the correct test result and confirms that the fuel injection computer and the circuit is supplying the TPS with power. Remember that your Mustang TPS should be plugged in for this part of the test. Also, test the ground sensor wire along with the positive battery terminal. You will have to wait for the sensor to reset, which should take around 20 minutes. With the multimeter set up, turn on the ignition without starting the engine. The sensor detects the opening and closing of the throttle valve and feeds that info Nov 3, 2022 · 4. The throttle position sensor reports the throttle aperture to the ECU and this information is vital not only for the fuel delivery control but also for the automatic How To Test TPS Throttle Position Sensor TPS test With multimeterWhat TPS should be at idle speed?At idle speed, it should be zero or a couple of degrees. Now you can take the other jumper wire and connect it to the positive red wire of the meter. Aug 21, 2023 · Insert the Feeler Gauge: Place a feeler gauge of the appropriate thickness (typically 0. The following are the steps on how to test a TPS sensor with a multimeter: Step 1: Examine for Carbon Build-up Feb 16, 2010 · This article will take you step by step thru' the testing and troubleshooting of the throttle position sensor on your GM 3. 5 to 1. 5 to 4. 5 to 5 Volts DC. This article will take you step by step thru' the testing and troubleshooting of the throttle position sensor on your GM 3. On the. Place your multimeter in Volts DC mode and with the red multimeter test lead probe the middle wire of the TPS sensor's connector. To test the TPS, use a multimeter to measure its resistance Feb 25, 2004 · Use a volt meter, and probe the TPS wire (the center one) and probe the negative to the black wire (signal return). 3k ohms. Use the multimeter to measure the voltage between the TPS signal wire and ground. 8L Nissan Sentra. The TPS sensor output should be between 0. If I where in your shoes and to make sure that the TPS really has failed, I would still make sure that the TP sensor gets both power and Ground. 5 to 5 Volts DC ) with the key on but engine off . This can be done by measuring the voltage and resistance of each terminal with a digital multimeter. This tutorial will explain how to test the electronic throttle body on the 2002-2007 4. As you can see in photo 2 of 2 (in the image viewer) the TP sensor has 2 connectors for a total of 6 wires coming out of both. We'll do a simple multimeter voltage test to find out if the wire is supplying Ground or not. 49 at WOT. The next wire to check is PIN 3 which happens to Alright, these are the test steps: 1. To see the TP sensor's wiring diagram go to: 1993-1995 TP Sensor Wiring Diagram (Jeep Grand Cherokee 4. 2L Ford E150 And E250 Test Tutorials. 5V coming back at idle position. 2 and 4. 4L Ford Throttle Position Sensor (TPS) (at: easyautodiagnostics. PART 3. Checking what the Thrott Oct 14, 2019 · TEST 1: Testing The TPS Signal With A Multimeter. You don't need any expensive diagnostic equipment to test the electronic throttle body since In this video, I will show you how I tested and replaced a throttle position sensor on my 1999 Ford Explorer. 000VDC. In this test, you'll check that the TP sensor is Jan 9, 2015 · PART 1: 1. Connect the red multimeter test lead to circuit #2 . 6 volts (this will be 12 volts on most meters). Place a 0. If there is no continuity, the throttle position sensor is faulty and needs to be replaced. It’s usually a small black box with a few wires running from it. More 3. TEST 4: Making Sure That The TPS Is Receiving Ground. Checking that power and Ground are being fed to the TP sensor . Wire 1 that leads to PIN 1 on your RB25 throttle position sensor, is the power wire. CASE 3: The multimeter DID NOT register any voltage. Aug 11, 2018 · If you think your throttle position sensor may need to be replaced, you can test it out two ways, both of which are tools that aren't exclusive to the job! N Feb 21, 2012 · Symptoms of a Faulty Throttle Position Sensor. With the throttle plate closed you should see a value of approximately 4-9 KΩ. Dec 5, 2022 · To turn the car on but not start the engine, switch the key to the on position. You can test this sensor with a multimeter tool. Intermittently flashing of check engine light for no apparent reason. Apr 9, 2023 · The TPS test typically involves the following steps: Idle Voltage Measurement: Start the engine and let it idle. Table of Contents: TPS Issues. Apr 4, 2024 · TEST 1: TPS Voltage Signal Check Key On Engine Off. Tighten the Screws: Evenly tighten the TPS screws, turning each one 1/8 of a turn at a time, until Sep 6, 2020 · As I mention in the video there seems to be a flat spot at the beginning of acceleration. These two steps can also help you determine whether you need to repair, replace or Nov 29, 2014 · One is to check that the TPS is getting power. Apr 24, 2020 · Testing throttle position sensor (gas pedal) I wanted to check the TPS (gas pedal) before pulling the throttle body and I found a 'test' on autozone repair guide saying to test the 1st & 2nd pins (6. Sudden idle surges. Aug 21, 2014 · To verify this increase/decrease in the throttle angle voltage, this is what we need to do: 1. TEST 2: Making Sure The MAP Sensor Is Getting Ground. 8V. Dec 19, 2023 · The throttle position sensor (TPS) is a critical component of the electronic throttle control system. Submitted By: creepinjeepster. 0L Ford Escape Tutorials. In order to test a 6 wire throttle sensor, one must first determine the electrical characteristics of the individual wires (attached to the throttle). 08 kohms) then check resistance between 2&3 (6. The throttle position sensor is mounted on the end of the throttle body and tells the computer how far open or closed the throttle is. We'll also test the throttle actuator motor. This test result lets you know the TP sensor is working OK and is not the cause of the TPS fault code issue. 7. Place your multimeter in Volts DC mode. Be careful not to over-tighten the screws, as this can damage the TPS or the throttle body. It will have the fuel line running from it. 2L Chevrolet TrailBlazer and GMC Envoy. This wire heads back to PIN 48 on your RB25 ECU. 42 Volts DC. Step#2. At Wide Open Throttle, the reading on your multimeter should read about 4. Voltage is fed to the TPS by the signal return circuit. Turn the key to the ON position but don't start the engine, and place your multimeter in Volts DC mode. With the throttle blade closed and the key turned to the “ON” position Aug 31, 2023 · How To Test GM Accelerator Pedal Position Sensor. 9V and wide open throttle should be ~4. Apr 30, 2018 · Everything you need to test the TPS on your dirtbike. A weak or dead battery is another common cause of throttle position sensor malfunctions. 45 mm) between the throttle stop screw and the stop lever. Aug 1, 2014 · TEST 3: Verifying Throttle Position Sensor Has Ground. Set the Digital or multimeter to DC volts. Sudden surges in speed while driving on the highway. If you're experiencing no start o Sep 12, 2019 · These are the test steps: 1. Turn on the engine. Nov 6, 2022 · Next, locate the throttle position sensor on the throttle body. Oct 29, 2021 · Here are the steps onhow to test TPS sensor. If the throttle body is dirty, it can affect the readings from the TPS. TEST 1: Checking The Throttle Position Sensor (TPS) Signal. It should climb steadily as the throttle opening increases. Aug 8, 2022 · The symptoms of a bad throttle position sensor include poor fuel economy, lack of engine power, a rough engine when idling, lack of power when accelerating, and engine misfires. But if you’re having trouble finding it, consult your vehicle’s manual. The exact same throttle body is used on the following vehic Feb 25, 2004 · Use a volt meter, and probe the TPS wire (the center one) and probe the negative to the black wire (signal return). By using a multimeter, you can determine if the sensor has an electrical connection issue. At WOT you should be over 4. Diagnosing a bad TP sensor involves testing the part. Check the engine control module for the trouble code that resulted in your illuminated check engine light to see if it is linked with your throttle position sensor. 1L or 3. With the throttle closed, it should be ~. Articl Id: 803. May 8, 2011 · Manually rotate the throttle plate by hand as you eye-ball the multimeter's voltage readings. Keep pressing the TPMS button down until the light next to the tire pressure indicator flashes three times. Generally, when the TP sensor fails, its TPS voltage signal will stay stuck in one voltage value as you open/close the throttle plate. The throttle position sensor (TPS) in the 1999-2004 4. Dec 8, 2022 · Step-by-Step Throttle Position Sensor Calibration. Aug 30, 2022 · How to test and replace and electronic throttle body. Replace the Battery. CASE 3: The multimeter DID NOT register any voltage . The sensor is now calibrated. B. The TPS voltage at idle should be within the manufacturer’s specified range, typically between 0. The throttle position sensor's job is to measure the angle of the throttle plate in the throttle body. Probe the wire labeled with the #3 (in the photo above) with the red multimeter test lead . Now, slowly close the throttle. Have your helper lightly tap the TP sensor with the butt of a screw-driver's handle (or something similar). I demonstrated how to test power, ground, and s Jun 23, 2011 · CASE 1: The multimeter registered 4. Connect the multimeter leads to the bottom two terminals (E2 and IDL) of the four TPS terminals. Also I show you how you can figure out what each wire on your sensor i Nov 23, 2016 · This video demonstrates how to test a TPS on a 1994 Chevy C1500 with a 350 TBI. pot. Then place one probe at pin number 4 and one at the number 6 pin. Aug 11, 2014 · 8. Jun 22, 2024 · Step 4: Testing TPS Sensor Output. 03 kohms) and 8&6 (0. With the ignition turned to the ON position you should have a switched power signal here. Common trouble codes include P0122, P0123, P0222, P0223 and P2135. 9. 5V at full defelection (both are within the mechancal. As the throttle is closing, you should see the voltage decrease smoothly and without any gaps or skips, to the exact same voltage you noticed in step 4. 4mm (0. ) Connect the black multimeter test lead to the negative battery (-) terminal. It should go steadily up and not “jump” around. This is the wire that connects to TPS male spade terminal identified with the letter B in the illustration above. The TPS can be tested with a simple multimeter and you find the test explained in a step-by-step manner here: How To Test The 4. If you notice any flat spots or abrupt changes in the meter readings, replace the TPS. Aug 23, 2013 · This first TP sensor test involves tapping into the sensor's middle wire, with your multimeter, and manually opening and closing the throttle plate to see if the multimeter registers the changes in the voltage output (of the sensor). Keep in mind this is a very sensitive sensor and very slight movements will produce large changes. Step 4: Connect to ground wire. Connect the red multimeter test lead (using the appropriate tool) to the LT GRN/RED wire. 10. Leave the harness plugged in, and turn the key on, but do not start the engine. Dec 1, 2023 · Touch the multimeter probes to the signal wire (yellow) and the power wire (red). Check the resistance in various accelerator pedal positions, record the resistance and compare against values listed as acceptable Jul 22, 2023 · Step 1: Locate the TPS. on its own to the car or make up a temporary test rig. 7L Jeep Grand Cherokee can be tested with a simple Jun 11, 2014 · Description Jun 6, 2010 · 9. To check if the battery is the cause of the issue: Dec 17, 2014 · Here is a video on how to test a throttle position sensor with a basic multimeter, I also show you how to do this without a wiring diagram. Nov 26, 2013 · The throttle position sensor responds to the accelerator pedal movement. johnnylovely said: You need a multimeter and somewhat of a grasp on electronics to set it the other way. In this episode I show how to test a two wire magnetic crankshaft position sensor with a basic multimeter and jumper wires. Dec 1, 2014 · One is to check that the TPS is getting power. At closed throttle it should read 1. The get this show on the road, we're gonna' check that the TPS voltage signal increases/decreases as we open/close the throttle plate. Check the voltage in the live (red) and signal (black) wire with reference to the ground wire. to/2DRjEXJInexpensive Multimeter on Amazon - https://amzn. 11. Then you must let go. 6. Apr 27, 2015 · 1. The throttle position sensor connector wire that feeds the sensor with Ground is the one that connects to pin #3 (in the illustration above). 4- Twist the throttle to see if the reading changed or not. OK, here are the test steps: May 20, 2013 · The centre wire is the signal wire. The throttle body is an essential component of the engine's air intake system. The voltage should increase or decrease smoothly and proportionally as you open and close the throttle. to/3To1VyA9V battery connectors https://amzn. The multimeter should read a voltage between 0. The multimeter's initial voltage reading should increase smoothly as you open the throttle plate to its Wide Open Position. signal wire you should see around 0. 5 and 4. If it does jump around or is not a smooth definite increase in voltage, you may have a faulty TPS. This is the wire that connects to TPS pin #3 in the illustration above. How to Test a Throttle Position Sensor You can use a standard ohm meter to test a switch and combination type throttle position sensor and a volt meter to test a throttle position sensor that uses a potentiometer. You will see a device connected to the throttle body that has wires running to the ECU. Carefully slide the TPS back into place and tighten the mounting screws. If you want to test the throttle position sensor (TPS), you will first need to clean the throttle body. Where To Buy The TPS And Save. 10 kohms) and 7&8 (6. Slowly close the throttle plate. Turn the key on but don't crank or start the engine. Symptoms Of A Bad Throttle Position Sensor. Tighten the two TP sensor screws once the TPS voltage output is between 0. Step 2: Inspect area. to/2NLt0udThis video dem May 3, 2014 · TEST 1: Testing The TPS Voltage Signal. ) Your multimeter should read 4. If the voltage reading is outside the specified range, it may indicate How To Test TPS 1, TPS 2, And The Throttle Actuator Control Motor Of The Electronic Throttle Body. Sudden engine stalling without any apparent reason. 1-Set the meter to 5 volts or closest to it (depending on your multimeter). If the TP sensor is bad, the tapping will cause gaps in the voltage readings. TEST 1: Making Sure The TPS Is Getting 5 Volts. 9 Volts DC. #5 ·Nov 5, 2007. The data will be collected at different throttle settings, including closed, slightly open, and fully open. Sep 29, 2023 · Step#1. So, the absolute best way to find out if the TPS has failed on your Nissan is by manually testing the TP sensor with a multimeter (while Mar 10, 2012 · Using the same probe connections as above, change your meter to the lowest setting that you have above 3. TEST 3: Making Sure The TPS Is Receiving 5 Volts. The first step in checking your throttle position sensor is to locate it. The voltage should decrease till it reaches the value you observed in test step 5. Feb 16, 2010 · Articl Id: 195. 2L S10 and Sonoma). Hesitation while accelerating. 3L equipped Nissan Pathfinder (Frontier, Xterra or QX4)'s throttle position sensor (TPS) is to remember that: The TP sensor's voltage decreases when the throttle plate closes. Again, refer to your vehicle’s service manual for the specific voltage range for your TPS. 8 and 5 volts. Turn the key on but don't start the engine. The other wire will be the ground and should show no voltage. Nov 3, 2022 · 4. If the voltage is outside this range Oct 3, 2023 · Insert a Thickness Gauge. Aug 14, 2013 · The throttle position sensor (TPS) on your 3. If you're getting P0120, P0121, P0122, P0123, P0124 this Jul 12, 2010 · 8. range of movement of the drive tang). Sep 8, 2023 · With the TPS adjusted, you can now reinstall it on the throttle body. Have your helper lightly tap on the throttle position sensor with the handle of a screw-driver or something similar. Adjust the TPS: Slowly turn the TPS clockwise until the ohm meter deflects to 0 ohms. 0177″ or 0. to/2JFEcVMIf you don't want to How to Test a Throttle Position Sensor You can use a standard ohm meter to test a switch and combination type throttle position sensor and a volt meter to test a throttle position sensor that uses a potentiometer. Tools required are a multimeter, and a small blade or a knife to slightly nick Mar 28, 2015 · 1. . This test confirms a problem with the throttle position sensor on your 2000-2002 1. Unplug the tps sensor and stick the meters leads into the connector. Educational video on how the Throttle Position Sensor (TPS) works and how to test for proper operation using a digital volt meter and a Digital Storage Oscil About Press Copyright Contact us Creators Advertise Developers Terms Privacy Policy & Safety How YouTube works Test new features NFL Sunday Ticket Press Copyright May 28, 2023 · Slowly move the throttle to WOT (Wide Open Throttle) and carefully monitor the voltage. 3. You'll be able to find out if TPS 1 or TPS 2 is defective or not. An unexplainable bucking and jerking in the vehicle. 2- Place the negative lead of the multimeter on the black wire (negative side). The TPS Code Won't Go Away. Without this tool, you won’t be able to tell if the sensor is broken or not. Sep 12, 2019 · IDLE SWITCH TEST: If you need to test the idle switch part of the TPS, this tutorial will help: TPS Idle Switch Multimeter Test (1995-1996 1. Power is in the form of 5 Volts. The next step is to test the Ground circuit of the throttle position sensor, go to: TPS TEST 3: Making Sure The TPS Is Getting Ground. Do you want to learn how to calibrate your throttle position sensor using a multimeter? Watch this video by boostedjohn, a professional mechanic and car enthusiast, who shows you the easiest and CASE 2: The throttle angle voltage DID NOT increase/decrease as you opened/closed the throttle plate. This is the throttle position sensor. 5 to 5 Volts. The battery provides power to the ECU, and if it’s not working properly, the ECU may not be able to process the signal from the sensor correctly. TEST 2: Verifying TPS Has Power. Step 3: Connect the Multimeter. 6L, 5. C. Sep 4, 2014 · Using your voltmeter or multimeter, take the leads and measure resistance between PIN 1 and PIN 4 of the throttle position sensor. Then see the results that you get. It should go smoothly from 0 volts closed to 3. Very slowly turn the TPS clockwise until the meter just switches from a less than 2 Ohm reading to an open circuit (infinity). Connect the negative lead of the multimeter to a suitable ground point on the vehicle. Cleaning the Throttle. Where is the Throttle Position Sensor Located? The throttle position sensor (TPS) on a car is usually found on the throttle body assembly. Subscribe: http://youtube. 18 kohms) while gently depressing the pedal to check for a Oct 21, 2022 · The TPS is tested by measuring the voltage at the TPS sensor output. The multimeter's voltage reading should decrease in a smooth and linear fashion and return to the initial voltage reading you observed at the beginning of the test. Feb 2, 2015 · Here is a quick video on how to test a Throttle Position Sensor TPS with a multimeter. Check the resistance in various accelerator pedal positions, record the resistance and compare against values listed as acceptable Sep 24, 2008 · Move the throttle and look for smooth meter response up to the 4. A faulty TPS can cause erratic throttle response or a complete loss of power. It measures the throttle plate’s position and sends this information to the engine control unit (ECU). Slowly open the throttle to different positions while observing the multimeter readings. Now open your Silverado hood and locate the throttle sensor. ni dt tn ws wy bo uu ph em em