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Old June 2nd, 2014, 07:52 PM   #1
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Throttle Body Relearn

To my relief I found the solution to mine if not many others problems relating to fluctuating idle, throttle bucking/jerking, and random DTC's along with it including:

• DTC P2279 (intake air system leak)
• DTC P0507 (idle control system RPM higher than expected)

If you have ever done any of the following and have any of the symptoms listed above keep reading!

• Hondata Tune or ECU replacement
• Throttle Body Replacement or modification
• Throttle Body Cleaning or maintenance

If you replaced an ECU, that ECU has its memory/setting locked onto to its original throttle body. Now if you put that into a new car with a "foreign" throttle body or vice versa, the calibration in some cases will not be correct. The throttle plate can be barely cracked open, but the ECU thinks its at an idle setting, which will flag codes or cause idle problems. This also applies for cleaning the throttle body because you will more than likely move the plate by hand to access the grim build up, which can mess up the calibration. The ECU needs to relearn its closed plate position.

THE SOLUTION: Quite a simple one.

All you need is the HDS (Honda Diagnostic Software).

For those who don't have access, you can ask a Honda dealership to do this for you.

1. Load the HDS and put in vehicle information.
2. Go to PGM-FI.
3. Select ETCS.
4. Select TP POSITION CHECK, and clear the original throttle position learned value, and follow the steps to relearn.
5. Turn off the ignition, then, turn it back on. WALLAH.

If this does not fix your problem, then it's something else causing it, a leak, a bad or stuck IAC, low coolant, etc.
Sonnick, thisaznboi88 and jiga21 like this.

Last edited by pa1nt13aller; June 2nd, 2014 at 08:24 PM..
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Old June 2nd, 2014, 07:57 PM   #2
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Does the TB have to be off the vehicle ? Nice thread BTW, lol
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Old June 2nd, 2014, 07:57 PM   #3
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Sticky please!! One of the best post for the new guy.
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Old June 2nd, 2014, 07:59 PM   #4
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Your too quick, you answered in the Flash pro thread. Thanks

Answer, TB stays on the vehicle during the process and it's quick.
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Old June 2nd, 2014, 09:19 PM   #5
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Yeah I should have said something earlier but it's been a long time since I've performed a "throttle body service" on a car with drive by wire. If you get those sypmtoms of poor idle or idle fluctuation then it needs to be reset with the hds. Also there is no idle air control valve "iacv" on our cars. The throttle body is solely responsible for the proper idle. The throttle plate opens accordingly depending on the engine's temperature. It's like a controlled vacuum leak letting just enough air into the engine to idle properly. You can hear the throttle plate click open when you turn the key to the run position.
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