Check engine light code 20 - Yamaha R6 Forum: YZF-R6 Forums
Reply
 
LinkBack Thread Tools Display Modes
post #1 of 12 (permalink) Old 06-02-2019, 09:14 AM Thread Starter
Zip ties and Duct tape
 
r6Ben00's Avatar
 
Join Date: Mar 2018
Posts: 155
Bike: 2008 yamaha R6
Garage
Check engine light code 20

So my bike is throwing code 20, it runs perfectly fine even with the code displayed. I have looked in the owners manual and it says, the atmospheric pressure sensor voltage, and intake air pressure sensor voltage differ greatly. I took it to a shop and they replaced the the intake pressure sensor. After about 100 miles, the code is now back, the shop told me if it comes back i more than likely need a new wiring harness, which they quoted me at 650$!!!! Here's where things get weird, if i start the bike cold from sitting over night, the code is displayed. If i let it warm up until it gets past 100 degrees, turn it off, then turn it back on, there's no more code. I'm really at a loss for what to do, could it really be the wiring harness?
r6Ben00 is offline  
Sponsored Links
Advertisement
 
post #2 of 12 (permalink) Old 06-02-2019, 10:26 AM
I eat my R6
 
Join Date: Dec 2014
Location: Southwest Ohio
Posts: 1,505
Bike: 2008 Yamaha YZF-R6s Stock
Re: Check engine light code 20

Could be the shop's way of saying, "if it comes back, don't come back because we don't know what it is". Could be labor to replace the harness. Could be that the harness is commonly damaged and/or hard to acquire.

An issue like that I'd think is more typical of an ECU with broken solder joint(s) versus wire harness or sensor.

Any changes to the intake? Has the intake been disassembled to check for restrictions or other?

The ECU likely checks them against one another in which case, you test both of them. The 2nd Gen diag mode includes a readout for the sensors. The manual may include voltage ranges or resistance readings for testing the sensors.

Everything prior to the sensors' connection to the jack can be tested via voltage drop testing.

To view links or images in this forum your post count must be 5 or greater. You currently have 0 posts.

A straight pin or safety pin through a select wire will make it easy to get a reading.
Intuit is offline  
post #3 of 12 (permalink) Old 06-02-2019, 11:04 AM Thread Starter
Zip ties and Duct tape
 
r6Ben00's Avatar
 
Join Date: Mar 2018
Posts: 155
Bike: 2008 yamaha R6
Garage
Re: Check engine light code 20

Quote:
Originally Posted by Intuit View Post
Could be the shop's way of saying, "if it comes back, don't come back because we don't know what it is". Could be labor to replace the harness. Could be that the harness is commonly damaged and/or hard to acquire.

An issue like that I'd think is more typical of an ECU with broken solder joint(s) versus wire harness or sensor.

Any changes to the intake? Has the intake been disassembled to check for restrictions or other?

The ECU likely checks them against one another in which case, you test both of them. The 2nd Gen diag mode includes a readout for the sensors. The manual may include voltage ranges or resistance readings for testing the sensors.

Everything prior to the sensors' connection to the jack can be tested via voltage drop testing.

To view links or images in this forum your post count must be 5 or greater. You currently have 0 posts.

A straight pin or safety pin through a select wire will make it easy to get a reading.
The shop actually said they swapped in a new ECU with the one in my bike to rule out if it might be the computer, it wasn't. No work has been done to the intake and the bike is basically stock except for appearance mods. I do have HID's which i have heard can cause some problems for some people.
r6Ben00 is offline  
 
post #4 of 12 (permalink) Old 06-02-2019, 02:01 PM
I eat my R6
 
Join Date: Dec 2014
Location: Southwest Ohio
Posts: 1,505
Bike: 2008 Yamaha YZF-R6s Stock
Re: Check engine light code 20

Quote:
Originally Posted by r6Ben00 View Post
................ do have HID's which i have heard can cause some problems for some people.
That theory is easy enough to test. Unplug them and/or remove the headlight fuse.

(note: sensors have solder joints too)
Intuit is offline  
post #5 of 12 (permalink) Old 06-02-2019, 08:03 PM Thread Starter
Zip ties and Duct tape
 
r6Ben00's Avatar
 
Join Date: Mar 2018
Posts: 155
Bike: 2008 yamaha R6
Garage
Re: Check engine light code 20

I also should add that the code only comes on when the bike is cold from sitting overnight. As soon as the bike warms up past 100 degrees, I can turn it off, turn it back on, and the code will be gone. It wont come on while riding, and i can park it for about 2 hours, come back and there be no code. But as soon as the bike gets below 110 degrees give or take from sitting, the code will come back on before starting. I should also mention that the bike has only 13k on the ODO.
r6Ben00 is offline  
post #6 of 12 (permalink) Old 06-03-2019, 07:59 PM
I eat my R6
 
Join Date: Jan 2016
Posts: 2,833
Bike: 2015 R1
Garage
Re: Check engine light code 20

if you have the service manual look at page 8-54(377). gives you instructions how to test this problem.
yamahacrazy is offline  
post #7 of 12 (permalink) Old 06-04-2019, 06:21 AM Thread Starter
Zip ties and Duct tape
 
r6Ben00's Avatar
 
Join Date: Mar 2018
Posts: 155
Bike: 2008 yamaha R6
Garage
Re: Check engine light code 20

Quote:
Originally Posted by yamahacrazy View Post
if you have the service manual look at page 8-54(377). gives you instructions how to test this problem.
This helped, where is the atmospheric air pressure sensor located? I thought I saw another thread that said it was somewhere near the tail?
r6Ben00 is offline  
post #8 of 12 (permalink) Old 06-04-2019, 02:31 PM
I eat my R6
 
Join Date: Dec 2014
Location: Southwest Ohio
Posts: 1,505
Bike: 2008 Yamaha YZF-R6s Stock
Re: Check engine light code 20

The manual tells you where they're located.
Intuit is offline  
post #9 of 12 (permalink) Old 06-09-2019, 06:07 PM Thread Starter
Zip ties and Duct tape
 
r6Ben00's Avatar
 
Join Date: Mar 2018
Posts: 155
Bike: 2008 yamaha R6
Garage
Re: Check engine light code 20

Finally figure it out, it was a clogged vacuum line. Blew compressed air through it and man was it full of crud. Bike threw no more code after everything was put back together.
r6Ben00 is offline  
post #10 of 12 (permalink) Old 06-09-2019, 08:11 PM
I eat my R6
 
Join Date: Dec 2014
Location: Southwest Ohio
Posts: 1,505
Bike: 2008 Yamaha YZF-R6s Stock
Re: Check engine light code 20

Interesting. If the vacuum line is deteriorated, you'll want to replace it as it will occur again. I'd also like to know, just what the "crud" was? Oil?
Intuit is offline  
Sponsored Links
Advertisement
 
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Yamaha R6 Forum: YZF-R6 Forums forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in











Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome