Yellow Box Installed=Check Engine Light??
Community Organizer
Joined: Oct 2000
Posts: 8,646
Likes: 145
From: Chapel Hill, NC
It's some tight spaces under there so things can get confusing easily. I bet it's the same wires.
Rick: I would suggest that you give the picture above as the way of choice for most as it is the way I did it and as seen many others.
BTW: I am at ~19.75%. Though not running stock tires but rolling distance is supposed to be the same. GPS verified accurate.
Rick: I would suggest that you give the picture above as the way of choice for most as it is the way I did it and as seen many others.
BTW: I am at ~19.75%. Though not running stock tires but rolling distance is supposed to be the same. GPS verified accurate.
Former Moderator
Joined: Oct 2000
Posts: 3,826
Likes: 5
From: Denver CO
I just installed my yellow box. I followed Modifry's instructions exactly and used the third wire as Turbo_pwr and Defender recommended. I got the same results as Slick Rick. No speed correction and the lights on the yellow box continued to flash even when moving. I even disconnected the yellow box thinking that if I disrupt the signal to the speedo it would stop working. But the speedo works fine even if the third wire is an open. I then tried the yellow box using the fourth wire and it worked perfectly. So it's the fourth wire that should be used - this wire is blue with a white stripe as opposed to the third wire which is white with a blue stripe. Please don't anyone take this post the wrong way. I greatly appreciate the information I got from this thread. I just wanted to post this information for future users, especially since there are a lot of us who recently purchased the 4.57 gears.
Former Moderator
Joined: Oct 2000
Posts: 3,826
Likes: 5
From: Denver CO
Originally posted by gernby
Has anyone checked to see what the ECU thinks the speed is using an OBD-II scan tool after connecting the YB to C101?
Has anyone checked to see what the ECU thinks the speed is using an OBD-II scan tool after connecting the YB to C101?
Joined: Oct 2000
Posts: 9,033
Likes: 21
From: South of the pier, Huntington Beach, CA
I took mine out before installing the AEM EMS. Turns out the AEM EMS can't modify the speedo reading so I put it back in and after a few days it quit working. Long story short it was a poor power connection. It works fine with the AEM EMS now.
