How to do a GM throttle body relearn procedure

I have the Matco maxgo, which is a rebranded launch, and it is pretty darn impressive. It is much faster then my snap on scanner and more closely mimics the factory scan tool for each brand. My only complaint is that it doesn’t graph quite as well as the snap on.

Mac soup. 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. Many car makers including GM started installing fly by wire electronic throttle bodies. In those vehicles, the “gas” pedal isn’t connected to the throttle body by a cable. The pedal simply provides an electronic signal, telling the throttle body how much acceleration you’re requesting. A motor and gear reduction set inside the throttle body opens and closes the throttle plate to accomplish your request.

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Over time, carbon buildup can accumulate around the throttle plate, changing it’s “home” position. If the buildup occurs gradually, the PCM “learns” the new home position. But when your battery goes dead or you disconnect it to work on your vehicle, the PCM “forgets” the adapative home position. 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. If you don’t do a relearn procedure, the PCM will “hunt” for a new baseline idle. 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.

Matco Maximus 2.0 Hack

Here’s the throttle body relearn procedure

1) Start the engine and let it idle in park for 3 minutes. During that period the idle may be higher idle than normal.
2) After 3 minutes, turn the engine off and leave it off for 60- seconds.
3) Start the engine again and let it idle in park for 3 minutes one more time. During these run periods you may see a check engine light. Scan for codes and if you get throttle body related codes, clear them.
4) If the idle speed is still off, drive the vehicle at speeds above 44-mph and operate several acceleration and deceleration cycles. Then repeat step #3 one last time.

Maximus 2.0 Software


The idle should now be normal

©, 2015 Rick Muscoplat


Posted on by Rick Muscoplat


Matco Maximus 2.0 Problems

The Matco Maximus 2.0A Tablet Scan Tool, No. MDMAX2A, features ultra-fast graphing with the ability to display 15 graphs at once on the full-color 10.1' 1920x1200 IPS capacitive touchscreen. Designed to work with all current add-on boxes, it offers immediate bi-directional access to all available controllers for trouble codes, live data, actuations and more. The tool provides one-click commonly used resets, including brake reset, oil light reset, SAS reset, battery reset, electronic throttle relearn, TPMS reset, among others. The MDMAX2A is drop-tested, dustproof and waterproof to IP65 specifications, and it features a true docking station with VGA, audio out, Ethernet, two USB ports and connector storage. With a high resolution 2 MP front and 8 MP rear cameras with still and video capabilities, the tool includes a Class-2 Bluetooth 4.0 connector for optimum wireless connectivity. Capable of providing one-click Wi-Fi updates, the MDMAX2A also supports Identifix.

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