Although the code has the same frame of reference, it is worded slightly different on some brands, such as "Throttle position sensor circuit range/performance" on an Infiniti or "Electronic throttle control system malfunction power management" on a Hyundai. Possible bare wire on pigtail shorting to ground. It's been my experience that the wiring connector or "pig tail" on the throttle body gives problems in the form of a poor connection.The female terminals on the pigtail corrode or pull out of the connector. This is the “throttle valve closed position learn” procedure: 1. Something you can try yourself is an ETCS relearn procedure, which “teaches” the throttle body where its zero point is. The accelerator pedal sensor or its wiring failed. 7)  Wait 7 seconds, fully depress the accelerator pedal and keep it down for approx. In addition, it lets you to access the most commonly required service features such as oil service light reset, throttle body adjustment, DPF regeneration and much more. Symptoms of a P2138 code can range from stalling when you come to a stop, total lack of power, no acceleration, sudden loss of power at cruise speeds or stuck throttle at current rpm. Foxwell NT510 Elite Multi-System Scanner with 1 Free Car Brand Software +OBD is the most cost-effective professional scan tool of the industry. This procedure tells the ECU what voltages to expect when your foot is off the pedal. Photo of a throttle body, throttle body position (TPS) sensor is the black part to the lower right: The computer monitors the correlation of both voltages. You should see all the dash lights come on. 3)  Start the engine and let it run under the temp gauge is in the normal range. by Timothy Charlet. Pull the electrical connector out of the throttle body. Get the BEST auto repair information Alldatadiy.com and Eautorepair.net are professional-grade shop manuals—period. If the terminal connector has bent or missing pins you can pick up a new "pigtail" at most auto parts stores or from the dealer. The TPS sensors were not correlating for a few seconds and the computer needs to be cycled through its relearn phase to restore active response to the throttle body, or the computer needs reprogramming at the dealer. Cool Automotive Products and Tool Recommendations, Read AUTO REPAIR ARTICLES sorted by topic, Toyota Camry dies while driving — U0101, Custom Wordpress Website created by Wizzy Wig Web Design, Minneapolis MN. Idle speed = 650 ± 50 rpm (in P or N position). How to Buy a Good Quality Throttle Position Sensor. This houses the gears to actuate the throttle plate. The position sensor has a variable resistance potentiometer (or contact points, depending on model) that sends a varying voltage signal to the Power Control Module (PCM, your car's engine computer) according to the position of the throttle plate. Contact Us The top cover on the throttle body distorted preventing the gears from turning properly. It's mission is to afford greater control over the emissions, fuel economy, traction and stability control, cruise control and transmission responses. by Valerie Johnston. Check online or in a service manual for a possible relearn procedure to reset the computer. A throttle position sensor (TPS) is situated opposite the throttle linkage connection on the throttle plate. The automotive trouble code P2138 throttle/pedal position sensor/switch D/E voltage correlation refers to a problem related to the throttle's ability to open and close properly. The bottom line is, it can be a dangerous situation when control over the throttle is lost. GM throttle body relearn procedure How to do a GM throttle body relearn procedure. Alldatadiy.com, on the other hand, uses the factory diagrams. Inspect it closely for missing or bent female terminals. Procedure Reset Transmission Adaptive Learning DIY. It is not intended as repair advice and we are not responsible for any actions Each of these conditions must be met before attempting a Nissan Throttle Body Relearn Procedure: Battery voltage must be above 12.9V with engine running at idle Engine coolant temperature must be within 158 – 212 F Vehicle must be in Park or Neutral All electrical accessories OFF (Air conditioner, headlamp, rear window defogger) The steering wheel must be in the straight ahead position. Place a small amount of electrical grease on the terminals and reconnect it. In response the computer sends a voltage to the electric motor to open the throttle plate. Repeat the following procedure quickly five times within 5 seconds. ... You will need to have the throttle relearn procedure performed using a factory level scanner or the codes will return. Apart from the accelerator pedal sensor, the remainder of the components are in the throttle body. This is needed anytime the throttle has … 2018 Silverado DTC P2138 - Stranded 3 times so far... 2006 Acura TL Error Codes P0134 P2251 P2138 P0134, Pilot 2005 - P0137, P2138, P0300 & P0302 to P0306, 06 Pontiac Grand Prix Base Model Codes P1125, P2138, P2125, post Do not start the engine. Failing to do so can result in the vehicle entering Reduced Engine Power Mode. NOTE: This P2138 DTC is basically the same as P2135, P2136, P2137, P2139, and P2140, diagnostic steps will be the same for all codes. Foot is off the accelerator pedal Turn ignition switch ON and wait at least 2 seconds Turn ignition switch OFF and wait at least 10 seconds Turn ignition switch ON and wait at least 2 seconds Turn ignition switch OFF and wait at least 10 seconds. Replace it if the voltage spikes or it has no voltage at the signal wire. Vehicle speed must be 0 Transmission must be warmed up (driven for at least 10 minutes. This diagnostic trouble code (DTC) is a generic powertrain code. On many GM vehicles, an idle relearn procedure is required whenever the throttle body is cleaned or replaced. The first thing to do is go online and get the TSBs (technical service bulletins) for you vehicle relating to the code. If you’ve replaced your GM electronic throttle body or you’ve disconnected the battery, you must do a GM throttle body relearn to establish a new baseline idle. Turn the ignition off. Nissan Throttle Body Relearn Procedure. 4) Turn ignition switch OFF and wait at least 10 seconds. Finally, make sure the front wheels of the vehicle are in the neutral position pointing straight ahead. If there is power the throttle body is malfunctioning. If any are present, call the dealer and ask if they sell just the top cover. On inspection, you will notice a flat plastic cover on the top of the throttle body. The pin that centers and supports the gear fits into the throttle body housing and the top pin fits into the "thin" plastic cover. So you have to refer to the factory legends to learn the identification symbols and then refer back to circuit diagrams to find the splice and ground locations. When the check engine light begins to blink, release the pedal. Run the vehicle until the engine and trans are at full operating temp. The motor has a small metal gear protruding up through the housing under the cover. 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. NOTE: IF the theft deterrent relearn procedure does not work, please try the procedure again, before calling Technical Services. It is considered generic because it applies to all makes and models of vehicles (1996-newer), although specific repair steps may be slightly different depending on the model. When a camshaft sensor fails, the check engine light will illuminate and a fault code will be stored. I have seen faulty sensors cause engine stalling and poor engine drivability. The voltage should climb from .5 to 5.0 smoothly. When both voltages agree, the system is functioning properly. Turn the ignition … 11) Rev up the engine two or three times and make sure that idle speed and ignition timing are within the specifications. Within the next 5 seconds depress and release the pedal 5 … Fully depress the accelerator pedal Fully release the accelerator pedal. Throttle/Pedal Pos Sensor/Switch D / E Voltage Correlation. Wait 7 seconds, press, and hold the pedal for 10 seconds. If you still need help regarding the P2138 trouble code, please post If you own a 2002-2011 Nissan Altima and clean or replace the throttle body or replace the ECU, you must do a Nissan Throttle Body Relearn Procedure to get a proper idle speed. It will have 5 volts for reference and next to it a varying signal. Eautorepair.net redraws factory wiring diagrams in color and includes the component, splice and ground locations right in their diagrams. Position II: You should hear two clicks and all your dash lights should turn on. Turn the ignition switch on without starting the engine for at least 2 seconds. your question in our FREE car repair forums. Look online for wire terminal identification on the throttle body of your vehicle. you take on any vehicle. One drop or rough handling and it's history. Make sure the accelerator pedal is fully released. For example, on a Nissan, turn the ignition on and wait 3 seconds. If you’re tracking down a wiring issue, Eautorepair.net is the better choice. Look for corrosion. Handle it and its components with extreme care. Turn the key on and slowly depress the pedal. ), 1) Perform the Accelerator Pedal Released Learning procedure. However, Alldatadiy.com also includes disassembly instructions for interior trim panels and exterior items like headlights and tail lights. This procedure tells the ECU what voltages to … Inspect the top cover on the throttle body for cracks or warping. It drives a large "plastic" gear attached to the throttle plate. If no power is present, the computer is at fault. The TPS converts throttle movement and position to a voltage signal and sends it to the engine management computer, which uses the varying voltage signal to form engine management strategy. We are now ready to perform the required relearn procedure. If the cover is distorted in any way, the gear will be compromised requiring total replacement of the throttle body. When they deviate for two seconds, the code P2138 is set indicating a malfunction somewhere in the system. A few points about the electronically controlled throttle. Additional trouble codes may accompany this code which further identify the problem. NOTE: This information is presented for information purposes only. With a voltmeter, probe the accelerator pedal sensor. That saves a lot of time because you don’t have to refer back to the component locator or circuit locations. Prior to this, the vehicle's throttle was controlled by a simple cable with a direct connection between the gas pedal and the throttle. When you depress the accelerator pedal you are pushing down on a sensor indicating the desired amount of throttle opening which is sent to the engine management computer. Check online or in a service manual for a possible relearn procedure to reset the computer. All information on this site is copyright protected. The camshaft position sensor is used to synchronize fuel injection and as a feedback device for VANOS (variable camshaft timing) control. Clean any corrosion using a small pocket screwdriver. your question in our FREE car repair forums. ... P2135 Throttle/Pedal Position Sensor/Switch “A”/”B” Battery Correlation ; The new "electronic throttle control" technology consists of a accelerator pedal position sensor, an electronically controlled throttle body complete with an internal motor, two embedded throttle position sensors for correlation factors and the engine management computer. Other throttle related DTCs: P0068, P0120, P0121, P0122, P0123, P0124, P0510, & others. Idle Relearn Procedure Needed . Press the gas pedal all the way. 20 seconds until the MIL stops blinking and turned ON. (adsbygoogle = window.adsbygoogle || []).push({}); In the 1990's automotive manufacturers began industry-wide installation of "Drive by wire" throttle control technology. The steering wheel must be in the straight ahead position. 5) With your foot off the accelerator pedal, turn the ignition switch ON and wait 3 seconds. Do NOT start the car. Probe the throttle body connector for power to the throttle motor. 1) Perform the Accelerator Pedal Released Learning procedure. For example, on a Nissan, turn the ignition on and wait 3 seconds. 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? Check online or in a service manual for a possible relearn procedure to reset the computer. Turn the key to position 2. GM Crankshaft Position Sensor Relearn The PCM needs to learn the variability of the Crankshaft Position Sensor to better detect misfire conditions. Have a helper turn the key on and slightly depress the pedal. Within the next 5 seconds depress and release the pedal 5 … For example, on a Nissan, turn the ignition on and wait 3 seconds. Vehicle speed must be 0 Transmission must be warmed up (driven for at least 10 minutes.) These TSBs result from customer complaints or recognized problems and the factory recommended repair procedure. Within the next 5 seconds depress and release the pedal 5 times. You can also perform this procedure if you feel the idle speed it out of spec. 6) Then perform this procedure with the engine off, key in ON position. The engine management computer has failed. In most cases, their diagrams are right from the factory manuals. Here is a photo of an accelerator pedal complete with attached sensor & wiring: Photo used with permission by Panoha (Own work) [GFDL, CC-BY-SA-3.0 or FAL], via Wikimedia Commons. 8) Fully release the accelerator pedal within 3 seconds after the MIL turned ON. 9) Start engine and let it idle. 10) Wait 20 seconds. Wait 10 seconds and depress the pedal again for 10 seconds and release. Nissan calls this an Idle Air Volume Learning Procedure. 2) Perform the Throttle Valve Closed Position Learning Procedure Foot off the accelerator pedal Turn ignition switch ON. This system is incredibly sensitive and vulnerable to damage, more than any other system. If not, replace the throttle body. Additionally, the check engine light will illuminate and the code will be set. Symptoms of a Bad or Failing Throttle Controller. Turn ignition switch OFF and wait at least 10 seconds During the last 10-second period, listen to the throttle body to make sure you hear it moving. All content © 2004-2021 OBD-Codes.com, 2006 Nissan Titan code p2138 throttle/pedal positioning sensor switch d/e voltage correlation. Two throttle position sensors imbedded in the throttle body convert the amount of throttle opening to a voltage signal to the computer. Many car makers including GM started installing fly by wire electronic throttle … They include wiring diagrams and technical service bulletins.
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