Chevy throttle body relearn procedure

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Transcript: Congratulations on installing your brand-new Spectra Premium electronic throttle body. Firstly, check the vehicle for any pre-existing trouble codes and make the appropriate repairs. Inspect the PCB system. Inspect the engine for any damaged hoses that could cause a vacuum leak. Special attention should be given to the PCV system, oil dipstick, and filler cap seals for damage. Disconnect the negative battery terminal for 30 seconds to reset the onboard computer.

Do not perform the relearn if the service engine soon light is on and codes related to the mass airflow sensor, manifold absolute pressure, or incorrect idle speed are found. If everything is in order, we can begin.

Third, turn off all accessories such as the air conditioning, rear window defogger, radio, and heater blower to prevent a load on the engine which would cause erroneous positioning of the throttle plate. Finally, make sure the front wheels of the vehicle are in the neutral position pointing straight ahead. We are now ready to perform the required relearn procedure.

Make sure the accelerator pedal is fully released. Turn the ignition switch on without starting the engine for at least 2 seconds. Turn the ignition switch off for at least 10 seconds.

Again, turn the ignition on for at least 2 seconds. Turn the ignition off for at least 10 seconds. This action will inform the computer on the new release position of the accelerator pedal and the closed position. Now that this is done, we can move on to the next step.

Please make sure to follow these next instructions precisely as every action is performed within a few seconds. Turn the ignition switch on and wait 3 seconds. Immediately after the 3 seconds, the accelerator pedal must be pressed and released 5 times within 5 seconds. Wait 7 seconds and fully press the accelerator pedal and hold for approximately 20 seconds until the check engine light stops blinking and stays on. Within 3 seconds after the check engine light stays constantly on, release the accelerator pedal.

Now start the engine and let it idle. After 20 seconds, rev up the engine a couple of times to ensure idle speed is within specifications. If the relearn was unsuccessful, turn the key to the off position wait 60 seconds and restart the process. Thank you for watching.

For more instructional videos, please remember to subscribe to the channel. You can also follow us on Facebook and Twitter. They are like the nerve endings of the vehicle. Related Information. Read More. Watch Video. Quality Brands. Send this to friend Your email Recipient email Send Cancel.Automotive Forums. Under most circumstances, it will relearn after just driving the car for a while, but if your car continues to experience an abnormal idle, or you just don't want to wait for it to relearn on its own, you can try this procedure.

While The negative cable is dissconnected, pump the brake pedal a few times to clear out any voltage in the system. Re-connect the negative cable after this is complete. Turn off air conditioning controls and all other accessories. Allow engine to run for at least 5 minutes. With engine stabilized and in closed loop, the IAC motor values should be between nine to 12 counts. If not, the adjustments may be tailored by adjusting the minimum air rate screw.

More throttle valve opening equals lower IAC counts. Less throttle opening equals higher IAC counts. That's a good thing to know. Here's something I found in my Haynes to help provide some more guidance. Instead of typing a long paragraph, I'm going to put into steps. Start the engine and run it as close to idle speed as possible until it reaches its normal operating temperature.

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Run it for approximately 2 minutes at RPM. Drive the vehicle as far as necessary, approximately 5 miles of varied driving conditions is usually sufficient to complete the relearning process. Robert A. Can you please tell me how to check the counts of the IAC? Pull ECM fuse for about 30 sec.

chevy throttle body relearn procedure

So far for the last 3 years I have never had a problem doing it this way. The problem I have, after the car warms up, you can hear, and see on the tach, it doing a periodic "bounce" down from rpm, or whatever it's supossed to be idling at all the time when warm. The car never stalls, because it recovers very quickly, but I didn't know if this was an indication of a failing IAC motor? The car never does this when given gas I have replaced the Ignition Module a year ago, as this did go bad tach would bounce all over the place at times, and stall the engine when really warm, etc How can I Trouble shoot this, or is this a classic sign of a failing IAC motor?

It's easy enough to replace, but I don't want to do it, unless it is what is causing the problem for sure. If all else fails, go to the gm garage and have the idle reset. I have learned that cleaning the throttle body before starting up after a battery disconnect helps tremendously!!! No creeping idleView Cart Checkout. Unless these procedures are correctly performed the vehicle will not start after the PCM has been replaced.

The three systems are:.

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How do you know what system your vehicle has? Just look at the keys see page 4. The sections that follow will help you identify the system and describe how to do the relearn. No relearn is required on a Passkey equipped vehicle when replacing the PCM. To perform a relearn on a Passkey II system, make sure there is a fully charged battery in the vehicle. The battery will be used for 30 minutes without the alternator available for charging.

Connect a battery charger to the battery to ensure power is available while programming. The Passlock anti-theft system requires the presence of a key in the lock cylinder to enable starting. The lock cylinder contains a stationary Hall effect sensor and a rotating magnet.

chevy throttle body relearn procedure

When the key is turned in the lock cylinder, the magnet creates a signal on the Hall effect sensor. To perform a relearn on a Passlock system, make sure there is a fully charged battery in the vehicle.

NOTE: For most cars, one minute cycle will be enough for the vehicle to learn the new password. Perform all 3 cycles if the car will not start after 1 cycle. Most trucks will require all 3 cycles for learning the password. The Passkey III anti-theft system uses a transponder inside the head of the ignition key.

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The exciter inside the ignition lock cylinder energizes this transponder when the ignition switch is turned on.

The transponder transmits a unique signature to the theft deterrent control module. If the key signature transmitted is acceptable to the theft deterrent control module, the theft deterrent control module will transmit fuel enable password to the PCM. If the fuel enable password is correct, the PCM will start the vehicle. To perform a relearn on a Passkey III system, make sure there is a fully charged battery in the vehicle.

When performing this relearn, all previously learned keys will be erased.Unlike a port fuel injection system, that sprays fuel into the intake manifold runner just above the intake valve, the injectors in this system spray fuel directly into the throttle body above the throttle plate.

The air gap between the throttle body and the throttle plate is calibrated to allow enough air to pass by it for the engine to run at base idle speed.

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The IAC Idle Air Control valve utilizes the on-board computer to fine tune the idle speed according to engine conditions. Remove the wing nut on top of the air cleaner and lift the air cleaner off the throttle body to access the vacuum lines. These are attached to the bottom of the air cleaner. Twist and pull the vacuum off of the bottom of the air cleaner and lay the air cleaner aside. Plug the vacuum lines with golf tees or other suitable item. Remove plug over the idle screw located on the right front of the throttle body by using a hammer to drive a punch into the plug and then using the punch to pry the plug out of the throttle body.

Discard the plug. Start the engine and let it run until it warms up. Turn off the engine and leave the ignition key in the "Off" position. Unfold a paper clip and bend it into a "U" shape. In GM vehicles that use this TBI injection, the connector is a black plastic rectangular connector located under the driver side of the dash. The "A" and "B" terminals are located on the top right of the connector. Unplug the IAC valve located on the passenger side, rear of the throttle body.

Start the engine.

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Insert a T size Torx driver into the Idle adjustment screw that is located behind the plug removed earlier. Turn off the engine and disconnect the negative battery terminal from the battery using a wrench. Reconnect the IAC valve. Reinstall the air cleaner and remove the paper clip from the ALDL connector. Reconnect the battery terminal after 5 minutes and test drive the vehicle.

This article was written by the It Still Works team, copy edited and fact checked through a multi-point auditing system, in efforts to ensure our readers only receive the best information. To submit your questions or ideas, or to simply learn more about It Still Works, contact us. Step 1 Remove the wing nut on top of the air cleaner and lift the air cleaner off the throttle body to access the vacuum lines.

Step 2 Remove plug over the idle screw located on the right front of the throttle body by using a hammer to drive a punch into the plug and then using the punch to pry the plug out of the throttle body. Step 3 Turn off the engine and leave the ignition key in the "Off" position. Step 4 Unplug the IAC valve located on the passenger side, rear of the throttle body.

Warning Wear safety glasses and work gloves when working around a running engine to prevent serious injuries. About the Author This article was written by the It Still Works team, copy edited and fact checked through a multi-point auditing system, in efforts to ensure our readers only receive the best information.Modern vehicles, such as those manufactured by Chevy, work in unison with computer modules within the engine compartment. An idle relearn procedure must be performed if a computer, or chip, is replaced in the vehicle.

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An idle relearn procedure is a way to reprogram the vehicle's computer memory to idle at a specified RPM, or revolutions per minute. Without the programmed idle, the vehicle can run arbitrarily, resulting in unnecessary engine wear. Chevy uses a simple idle relearn process.

After you replace the computer chip, it will automatically reset itself when you turn the ignition key from the "on" position to the "off" position. Blue Streak Electronics recommends to warm the engine after the idle relearn procedure, without use of the air conditioner. After the engine is warm, switch the air conditioning on and off, and then put the transmission into the "drive" position.

These actions complete the full idle relearn procedure. It is imperative that a technician verifies that the car's battery is fully charged. If power fails during a relearn procedure, the technician must reprogram the computer chip.

This article was written by the It Still Works team, copy edited and fact checked through a multi-point auditing system, in efforts to ensure our readers only receive the best information. To submit your questions or ideas, or to simply learn more about It Still Works, contact us.

Considerations It is imperative that a technician verifies that the car's battery is fully charged. About the Author This article was written by the It Still Works team, copy edited and fact checked through a multi-point auditing system, in efforts to ensure our readers only receive the best information.Many car makers including GM started installing fly by wire electronic throttle bodies.

A motor and gear reduction set inside the throttle body opens and closes the throttle plate to accomplish your request. It will eventually learn it on its own, but it may take over a week of driving, during which time you will experience high and low idle speeds and possibly rough idle.

During that period the idle may be higher idle than normal. During these run periods you may see a check engine light. Scan for codes and if you get throttle body related codes, clear them. Then repeat step 3 one last time. Unlike the cheaper Haynes and Chilton manuals that cover multiple year models, leaving the exact information you need to fix your car, these professional manuals cover your exact year, make, model.

chevy throttle body relearn procedure

Plus, they contain full trouble code descriptions and troubleshooting instructions. Pricing: Eautorepair.

chevy throttle body relearn procedure

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. However, Alldatadiy. If you need to dig into your doors, dash or console, Alldatadiy. Find this article useful? Share it! Tags GM throttle body relearn.

Prominent words 3 minutes body relearn body relearn procedure do a gm throttle do a gm throttle body gm throttle body gm throttle body relearn home position idle idle in park idle in park for 3 let it idle in park new baseline idle park for 3 park for 3 minutes relearn procedure start the engine throttle body throttle body relearn throttle body relearn procedure.When the crank sensor is replaced, it must be resynced to the PCM.

Without resyncing, the PCM cannot properly determine the position of the crankshaft. The proper procedure for resyncing or relearning the crankshaft position is called the "CKP Variation Learn. Shift the GMC vehicle's transmission into park, or first gear for a manual transmission. Apply the parking brake and leave the engine running.

Plug an automotive scan tool's data connector into the vehicle's diagnostic data port. This port is situated underneath the dashboard on the driver's side of the vehicle, to the right of the steering column.

Power on the scan tool and select "PCM" from the main welcome menu. Allow the scan tool to perform the CKP Variation learn procedure. This can take up to 10 minutes. Do not turn off the engine or disconnect the scan tool during this procedure. Remove the scan tool. Turn the engine off, then back on again.

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Verify that the engine runs smoothly. This article was written by the It Still Works team, copy edited and fact checked through a multi-point auditing system, in efforts to ensure our readers only receive the best information.

To submit your questions or ideas, or to simply learn more about It Still Works, contact us. Step 1 Shift the GMC vehicle's transmission into park, or first gear for a manual transmission. Step 2 Plug an automotive scan tool's data connector into the vehicle's diagnostic data port. Step 3 Power on the scan tool and select "PCM" from the main welcome menu. Items you will need Automotive scan tool with relearn capabilities. About the Author This article was written by the It Still Works team, copy edited and fact checked through a multi-point auditing system, in efforts to ensure our readers only receive the best information.


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