Show More. The easiest way to reset your throttle position sensor is to unhook the negative cable from your battery for up to five minutes or to remove the fuse for your engine control module. Tighten the bolts just enough to allow the new sensor to slightly move back and forth for final adjustment. The display shows the current calibration status. The proper procedure for resyncing or relearning the crankshaft position is called the "CKP Variation Learn." If the sensor fails, the computer has no precise control over the engine fuel delivery. This picture shows a typical carburetor with throttle cable (upper cable) and transmission TV cable (lower cable). Turn on the ignition and set the voltmeter to the 12-volt scale. Allow the scan tool to perform the CKP Variation learn procedure. These are locked in with thread lock compound, so be careful to keep steady pressure and not strip the bolt heads. IMPORTANT: The throttle position sensor, on your 2.4L Quad 4 engine, has to remain connected to its electrical connector for this test. Replacing the sensor is essential for good performance. Select "Special Functions" from the secondary screen, then choose "CKP Variation Learn" from the "Special Functions" menu. Share this conversation. GMC vehicles started using throttle position sensors in the mid 1980s when computerized engine controls were introduced. The crankshaft sensor on GMC vehicles is synced to the powertrain control module, or PCM. You have five seconds to do this. GM Mechanic: Dave Nova, GMC Technician replied 9 years ago. Without resyncing, the PCM cannot properly determine the position of the crankshaft. But when your battery goes dead or you disconnect it to work on your vehicle, the PCM “forgets” the adapative home position. 2) After 3 minutes, turn the engine off and leave it off for 60- seconds. Just opposite the throttle lever, on the opposite side of the throttle body, the throttle position sensor is located. In most cases, their diagrams are right from the factory manuals. As the throttle moves, a voltage signal ranging from 0.5 volts to 5.0 volts is sent to the engine computer. If the calibration has been performed properly, “CAL GOOD” should remain on the screen. Do not turn off the engine or disconnect the scan tool during this procedure. Show Less. Once set, those positions are used to calculate the actual throttle percentage. The proper procedure for resyncing or relearning the crankshaft position is called the "CKP Variation Learn." Your multimeter, if all is OK with the TPS, should register 0.5 to 0.7 Volts DC. Resetting is sometimes all that is required to restore your sensor. When the crank sensor is replaced, it must be resynced to the PCM. Just opposite the throttle lever, on the opposite side of the throttle body, the throttle position sensor is located. During that period the idle may be higher idle than normal. Locate the accelerator linkage. Many car makers including GM started installing fly by wire electronic throttle bodies. Pull the TV cable smoothly as far as it will easily travel, hold it for a second, then release it smoothly. Over time, carbon buildup can accumulate around the throttle plate, changing it’s “home” position. [])), +((!+[]+(!![])+!![]+!![]+!![]+!![]+!![]+!![]+!![]+[])+(!+[]+(!![])+!![]+!![])+(+!![])+(!+[]-(!![]))+(!+[]+(!![])+!![]+!![]+!![]+!![]+!![]+!![])+(!+[]+(!![])+!![])+(!+[]+(!![])+!![]+!![]+!![]+!![]+!![]+!![]+!![])+(!+[]+(!![])+!![]+!![]+!![]+!![]+!![]+!![])+(+!![]))/+((!+[]+(!![])+!![]+!![]+!![]+[])+(!+[]+(!![])+!![]+!![]+!![])+(!+[]+(!![])-[])+(!+[]+(!![])+!![])+(!+[]+(!![])+!![]+!![]+!![]+!![]+!![]+!![])+(!+[]+(!![])+!![]+!![])+(!+[]+(!![])-[])+(!+[]+(!![])-[])+(+!! They include wiring diagrams and technical service bulletins. When the throttle pedal moves, the throttle sensor also moves in direct response to the driver commands. Begin by starting the vehicle in park. Leave the battery connected. 3) Start the engine again and let it idle in park for 3 minutes one more time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ubmitted: 9 years ago. That saves a lot of time because you don’t have to refer back to the component locator or circuit locations. This corresponds to about 1.25 volts in pressure sensor output. Ground the black multimeter test lead on the battery negative terminal and then have your helper turn the Key On but don't start the engine. GMC vehicles started using throttle position sensors in the mid 1980s when computerized engine controls were introduced. Scan for codes and if you get throttle body related codes, clear them. [])), +((!+[]+(!![])+!![]+!![]+!![]+!![]+!![]+!![]+[])+(!+[]+(!![])+!![])+(!+[]+(!![])+!![]+!![]+!![]+!![]+!![]+!![])+(!+[]-(!![]))+(!+[]+(!![])+!![]+!![])+(+!![])+(!+[]+(!![])+!![]+!![]+!![]+!![])+(!+[]+(!![])+!![]+!![])+(+!![]))/+((!+[]+(!![])+!![]+!![]+!![]+[])+(!+[]+(!![])+!![]+!![]+!![]+!![]+!![]+!![]+!![])+(!+[]+(!![])+!![]+!![])+(!+[]+(!![])+!![]+!![]+!![]+!![])+(!+[]+(!![])+!![]+!![])+(+!![])+(!+[]+(!![])+!![])+(!+[]+(!![])+!![]+!![]+!![]+!![]+!![]+!![]+!![])+(!+[]-(!! Start and run the engine in PARK for 3 minutes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rab the end of the TV cable with your fingers or a pair of pliers. Put SAFETY FIRST. It bolts over the throttle plate shaft and has three wires connected with a snap-in plug. You should not attempt the throttle sensor calibration unless you are thoroughly familiar working around engines. Turn the engine off, then back on again. THROTTLE PLATE IDLE POSITION. Here a few common calibration problems and recommendations on how to solve them. If you need to dig into your doors, dash or console, Alldatadiy.com is the better choice because Eautorepair.net doesn’t any interior or exterior trim or body part removal. To submit your questions or ideas, or to simply learn more about It Still Works, contact us. In most cases, remove the air cleaner that covers the throttle body. In most cases, remove the air cleaner that covers the throttle body. Don’t attempt this if you’re uncomfortable working with electricity, as removing the wrong fuse or cable from your battery could be dangerous. The pedal simply provides an electronic signal, telling the throttle body how much acceleration you’re requesting. Be sure that the TV cable can move freely. []))). Copyright 2020 Leaf Group Ltd. / Leaf Group Media, "Truck and Van Repair Manual," Chilton's: 1991 to 1995. Disconnect the throttle position sensor from its electrical connector. In most cases, the TV cable is on a slip joint or can be unclipped from the throttle linkage. Category: GM. Power on the scan tool and select "PCM" from the main welcome menu. Turn off the engine and raise the hood of the GMC vehicle. The pressure variation in each transmission is different depending on the make, model, and customization of the transmission. In some circumstances, a low engine idle speed will prevent the transmission pump from developing full line pressure during calibration. If you replace the throttle body, the PCM won’t know and will continue to use the adaptive settings as if the carbon buildup is still in place. Running the calibration with the engine on a fast idle or at 1000 RPM may resolve this. However, Alldatadiy.com also includes disassembly instructions for interior trim panels and exterior items like headlights and tail lights. Get the BEST auto repair information Alldatadiy.com and Eautorepair.net are professional-grade shop manuals—period. Pricing: ---Eautorepair.net--- 1 month subscription $19.95 per vehicle 1-year subscription $29.95 per vehicle 4-year subscription $44.95 per vehicle ---Alldatadiy.com--- 1-year $29.95 subscription: additional vehicles $19/95 each 5-year $49.95 subscription: additional vehicles $34.95 each Which one should YOU choose? 3. Note: These procedures are a little tricky to do. Precise sensor voltage … 4. This is how the COMPUSHIFT Mini uses a pressure sensor to determine the throttle position. The throttle position sensor calibration process measures the lowest and highest line pressures as the TV cable is moved, and internally associates those pressures with the 0% and 100% throttle positions. 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A motor and gear reduction set inside the throttle body opens and closes the throttle plate to accomplish your request.