High Idle After Relearn

Phillip Diagnostician Anchorage, Alaska Posted   Latest   Edited  
Question
Driveability
2007 Chevrolet Equinox LS 3.4L (F) 5-spd (AF33)—2CNDL23F676224892
C0561 - Vacuum Sensor "A/B" Correlation
Idles At 1800 Rpms
High Idle

I cleaned the throttle body and performed idle reset with Matco maxgo-A AKA launch scan tool. After letting vehicle idle to full operating temperature with no loads on I shut the key off and checked over my work. All looked okay. I restarted the vehicle and vehicle started idling at 1800 RPM's. I thought I had kicked the carpet on to the pedal but nope pedal was fine. Thaught to myself is the throttle just stuck? So I performed a snap throttle and throttle would not kick down. I ended up having to put the vehicle in gear in order to get throttle to drop down. Shut vehicle off and vehicle idled fine. Test drove vehicle and shut off for 10 minutes, then restarted and vehicle started idling high again. Monitored TAC pids and found the all accelerator pedal PIDS was showing 0% and sensor 1 & 2 both agree. Saw the desired TPS was at 16% as opposed to 5% and actual was at 16% also. Desired idle was 650 RPM's and actual engine RPMS showing 1820 RPM's. I looked overall the work I had done and nothing seems out of place. Next morning I allowed engine to reach operating temperature again with no loads on. I shut off for 3 minutes and allowed vehicle to idle high at 1820 RPM's for 5 minutes and then put vehicle in drive. Idle dropped down to about 700 RPM's. I then drove the vehicle in town for over 10 miles seeing if I could learn the idle that way. Doing stop and go. I then parked the vehicle let it sit for 5 minutes and restarted. Vehicle idled at 650-700 RPM's. I then dove the vehicle around the block for good measure and brought back to shop once more. I parked the vehicle let it idle for a few minutes and then I snap throttled the vehicle and guess what? Idle picked back up to 1800 RPM's again. With the same pids before. Now I am stumped. I did have a code for C0561 - System Disabled Information in the ABS. I assumed this was due to the high Idle so I erased it to see if it would come back and it has not come back yet. This is the first time something like this has happened to me after servicing the electronic throttle body. The reason I serviced the throttle was because the customer had complained that the vehicle had sat for a long time and had to be jumped. After jumping the vehicle. The vehicle ran rough and then would not restart. When I got it the battery was dead. I jumped started the vehicle and vehicle started right up and drove it in the shop. Vehicle ran fine. Charged the battery and ended up diagnosing a bad rear wiper motor/module that was pulling an amp when the vehicle was shut off. I also noticed the throttle was sitting at 16-19% at idle which could explain the drive ability problems after the battery went dead. I then test drove the vehicle and noticed the heat output for the HVAC was low. The customer declined the module repair and had use flush the cooling system and clean the throttle body. Then after that the problems started. (yes the heat output is so much better now. Yes I made sure that all areas where dry before starting the vehicle and performing the throttle reset.)Any help be greatly appreciated.

UPDATE: So I tired do the Manuel reset and no go. Tried doing the one model year newer and still no go. ( Used both maxgo and snap on verus) It still high idles after I snap throttle the vehicle and wont come back down. Obviously that is not right. The next attempt I was going to make was try and reflash the ECM but I found that it has the latest calibration. I heard you could flash the wrong VIN , then reflash the right VIN and do the relearns that are necessary. I am not sure how I would do that as I have not done that before on a GM. Any help would be much appreciated. 

LAST UPDATE: I performed a module replace and program. Then reprogrammed the same VIN and performed the necessary relearns for that vehicle. Even though I got a message saying that it's not recommend to reprogram a module that already has the latest calibrations, I did any ways and I was able get the idle to learn and test drove it for a week and the problem has stayed gone. I want to thank you all for your help and I hope I can help some also some day.

+2
Chris Technician
Bryans Road, Maryland
Chris Default
 

I would try to complete the idle relearn under a 2008 Equinox and see if that helps I have had this work a few times on GMs. If that doesn't work from what I found in my searching it seems like some people have had luck reflashing the ECM and then doing the idle relearn. Hope this helps

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Tim Technician
Reading, Pennsylvania
Tim Default
 

I cant say for sure that it applies to this but I have had a few GM vehicles that would not idle after throttle cleaning or throttle replacement. The solution thus far has been to reflash the PCM to the latest calibration. After the software update the module is basically forced to learn idle. Dont know for sure that this will fix your issue but it is worth a shot. I have fixed probably a half

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Rusty Owner/Technician
Oakham, Massachusetts
Rusty Default
 

Can I assume that you did the throttle learn procedure at KOEO?

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Phillip Diagnostician
Anchorage, Alaska
Phillip Default
   

yes. As of now i have tried with the snap on verus and matco max go

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Matt Diagnostician
Red Wing, Minnesota
Matt Default
 

diag​.​net/msg/mxin1kqepl…

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Phillip Diagnostician
Anchorage, Alaska
Phillip Default
 

I'm not understanding what this one has to do with the ford. If you are asking about fuel times they were +/- 5%. long & short terms

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Matt Diagnostician
Red Wing, Minnesota
Matt Default
 

Oh shoot, sorry about that. diag​.​net/msg/m4gmsw4z9h…

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Sherwood Owner/Technician
St. Marys, Georgia
Sherwood Default
 

The first thing I would do it disconnect the battery and connect the terminals together for at least 10minutes to 1 hour. Some people use a resistor when doing this but I never have had a problem (knock on wood). The battery was low then was jump started then charged (the PCM might just need to be completely cleared). Then do the relearn using the correct year. If that doesn't work then I would

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Jim Owner/Technician
Charlotte, North Carolina
Jim Default
 

I have run into this with several GM models, it even effects transmission shifting, we use the Tech II, so not sure if other scan tools will have the ability. It's odd that is is under "module configuration" instead of service functions. But you'll see that TB Idle Airflow Compensation will be around 30-40 and will reset to zero. This is the procedure taken from Alldata, Throttle Learn

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Phillip Diagnostician
Anchorage, Alaska
Phillip Default
   

For what ever reason I do not have a TB Idle Airflow Compensation parameter. I normally look at that but the matco and snap on tool does not have that pid for this vehicle. Other ones it does. . I will go though all the other pids later to double check.

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Geoff Diagnostician
Lahaina, Hawaii
Geoff Default
 

" It's odd that is is under "module configuration" instead of service functions." is a GOLDEN nugget right there Jim. I bought my own Tech2 just recently and barely have any experience so far. (No shop has any OE tools except the dealers, here on Maui.)

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Martin Diagnostician
Burleson, Texas
Martin Default
   

OE tools are awesome. I have always used a snap on scanner and I always thought that the gm vehicles had really good coverage (and they do), but as I've used our tech2 (and other manufacturers), I keep finding new data, even on older vehicles that are not in my snapon tool. Makes you feel like you've been missing out this while time!

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Geoff Diagnostician
Lahaina, Hawaii
Geoff Default
   

What I noticed, Martin, the first few times I used my Tech2 was , "wow! the order of the data list MAKES SENSE!!!!" :-) Doubly-so when you go into special functions and it jumps down the list to where you need to look.

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Phillip Diagnostician
Anchorage, Alaska
Phillip Default
 

Problem is I have to work on all vehicles and can't afford all the OE tools. It took me years of saving and a really great deal to get into the Matco and Snap-On tool. If I owned my own business i could probably do it. One day I will start getting OE scan tools due to the security gateways and such, but for now I have to make doe with I can reasonably obtain.

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Geoff Diagnostician
Lahaina, Hawaii
Geoff Default
 

I can certainly understand that PZ. No shop here has any OE stuff. Luckily the Tech2 is usually available used for a good price (It's officially obsolete at dealers now) and is not a subscription, it just is. I own two modern GM and bought the tool for myself as "present". GW

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Martin Diagnostician
Burleson, Texas
Martin Default
 

Shoot, if I had to buy all the oe tools we have, there's no way I'd be able to afford it. The owner of your shop needs to pony up the bucks if he wants to keep running a business. It's only gonna get worse. I know it's probably like talking to a brick wall but if you're gonna service everything that rolls in the door, the shops gotta be tooled up. Depending on your clientel, ford IDS and gm gds

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Phillip Diagnostician
Anchorage, Alaska
Phillip Default
 

LOL!!!!!!!!!!!!!! if I left it up to the owner. I would only be doing brakes and throwing parts at vehicles. Yes I have looked at other shops but they are all the same that I have interviews with. I bought my own diagnostic equipment cause I wanted t be more then just a parts changer. And I was tired of waiting on empty promises.

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Martin Diagnostician
Burleson, Texas
Martin Default
   

I hear you brother. Been there. I don't know where you're at but find a Christian Brother's if there's one near you. Changed my career. And good for you for stepping up YOUR game!

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Todd Mobile Technician
Morinville, Alberta
Todd Default
 

Hi, Todd here. I second the suggestion to reflash the PCM. I have encountered this with many G.M.'s and especially Saturn.

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Brian Owner
Parma, Ohio
Brian Default
 

3rd , I have done literally 100's of re flashes for idle issues after shops performed throttle body cleaning and replacement on GM's , Note that if the vehicle has the latest calibrations GM may not allow a update ( depends on the year older works sometimes), In the past i just found another vin that would fit the vehicle program it , then program it back to the proper vin and the idle problem

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Phillip Diagnostician
Anchorage, Alaska
Phillip Default
 

Not sure how to get another GM VIN for this vehicle.

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Paul Owner/Technician
Los Angeles, California
Paul Default
 

This happened to me too using the Tech 2 there is no idle relearn or module config. A reflash solved the problem

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Phillip Diagnostician
Anchorage, Alaska
Phillip Update
 

I have updated my story. The problem is fixed and this one can be archived for the next person that has this problem.

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