Hi Fellows,
I am trying to do idle speed learn on Honda as per procedure but not able to do this. I read that EVAP connector has to be disconnected but it is not mentioned below. Is it really to do this because if do so then CEL comes up or it is only to know the current idle rpm.

Any help in this matter? Thanks.

PCM Idle Learn Procedure

The idle learn procedure must be done so the PCM can learn the engine idle characteristics.
Do the idle learn procedure whenever you do any of these actions:
• Replace PCM.
• Reset PCM.
• Update PCM.
• Replace or clean the throttle body.
NOTE: Erasing DTCs with the HDS does not require you to do the idle learn procedure.
1. Make sure all electrical items (A/C, audio, lights, etc.) are off.
2. Reset the PCM with the HDS.
3. Turn the ignition switch ON (II), and wait 2 seconds.
4. Start the engine. Hold the engine speed at 3,000 rpm without load (in Park or neutral) until the radiator fan comes on, or until the engine coolant temperature reaches 194 °F (90 °C).
5. Let the engine idle for about 5 minutes with the throttle fully closed.
NOTE: If the radiator fan comes on, do not include its running time in the 5 minutes.
6. Verify on the HDS data list that the idle learn procedure is complete.

Tags: Honda , Idle , Learn , rpm , up , down

 Thank you Ashraf for your reply.

On first Honda Civic 2006, idle rpm stays on 1000 and when the gas pedal is released after pushing, it does not come directly to 1000, it will come down to 1000 then 1500 and then slowly comes back to 1000 and engine continuously bumps (no fault code) at slow interval of approximately 10 seconds with low amplitude. Owner told that this problem was not there before. I checked the vehicle and it is without IAC valve and idle learn is not completed as got info from MaxiSys Pro. So, I was trying to do Idle Learn after resetting of PCM.

Second one is Honda Accord. Idle rpm goes down with AC load. I did not inspect the vehicle in detail, hopefully will do in next week.

As you mentioned the procedure after resetting of PCM... are you doing always after cold start or hot start? Because I was doing when the vehicle was hot and now I am planning to do with cold start.

Thanks.

 Thank you fellows for your suggestions. I will update when it will be done. Thanks.

The first Honda Civic Idle rpm (750) is fixed now with and without load. I did in the morning when ECT was around 38 degree celcius. Also cleaned the throttle and then followed the above procedure.

Thank you fellows for your usual cooperation and support.