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A90 Toyota Supra Traction Control Issue Resolved

RS-R EDC Canceller is the mod all A90 owners need in order to hit the track.

Sam Du
Aug 24, 2020

One month after I picked up my 2020 A90 Toyota Supra Launch Edition, I teamed up with Evasive Motorsports and Dai Yoshihara to see what sort of lap times we could put down with one of the first modified MK5s. Equipped with a prototype set of Clubsport coilovers from KW (basically borrowed from one of their race cars in Germany), 18" Titan 7 wheels and stickier Yokohama A052 tires, we had high hopes for our quick shakedown at Buttonwillow Raceway. To our surprise, we ran into issues with disengaging the traction control and vehicle stability control (VSC). Each lap we took the Supra out on, the traction control and VSC would relentlessly come back on no matter how many times we tried and disengage it. This made it impossible to throw down a hot lap.

2020 Toyota Supra EVS Tuning Front Splitter Photo 15/15   |   A90 Toyota Supra Traction Control Issue Resolved

The root of the problem could only be traced back to the fault codes you get when you modify a new Supra (which, at the time was foreign territory to everyone). There could've been a number of codes which triggered this, from the broken ride height sensor (which is a common issue when lowering the Mk5) to missing TPMS sensors, having aftermarket seats and removing the stock adaptive suspension, which, in the end, was the main culprit. Come time for Super Lap Battle, we remedied some of the codes and swapped to KW V3 coilovers; however, we suffered the same problem again having not fixed all of the electronics issues.

2020 Toyota Supra RSR Electronic Damper Cancellers Photo 15/15   |   A90 Toyota Supra Traction Control Issue Resolved

After SLB, I decided to give my friends at RS-R a call and sure enough, they've been selling hundreds of their EDC cancellers which have been tested on mild-to-wild modified Supras from around the world running various coilover setups. Auto Tuned in Monrovia, California, helped install the new RS-R modules which didn't take long once the car was lifted and the wheels were off. The RS-R cancellers come with mounting brackets and hardware so it's not just zip tied in place - a nice touch.

2020 Toyota Supra RSR Front Electronic Damper Canceller 03 Photo 15/15   |   A90 Toyota Supra Traction Control Issue Resolved

The front cancellers are mounted with the factory brake bracket on the knuckle. The rears are installed inside the fenders on an anchor bolt.

2020 Toyota Supra RSR Rear Electronic Damper Canceller 04 Photo 15/15   |   A90 Toyota Supra Traction Control Issue Resolved

The installation of all four cancellers was a breeze, felt secure and gave me some reassurance, although the ultimate test was whether or not they would work.

I brought the Supra out to a private testing day at Streets of Willow. With the ECU now reading no errors in regard to the suspension, I was able to disengage the traction control and VSC, and they stayed off! I should note, it did take 2-3 times of pressing the button to turn it off, but it worked. I've been told by other Supra owners that it works flawlessly on their car on the first try, but as for my car, it could be due to the fact that I have other codes still throwing the computer off.

2020 Toyota Supra EVS Tuning Side Skirts Photo 15/15   |   A90 Toyota Supra Traction Control Issue Resolved

Nonetheless, the RS-R EDC cancellers worked and while they retail for $349, they're definitely worth the investment if you're considering pushing your modified Supra to its limit. Now I'm looking forward to heading back to Buttonwillow one more time to set that hot lap. Third time's a charm, right?

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By Sam Du
1002 Articles
A90 Toyota Supra Traction Control Issue Resolved
Tuning Menu
Car: 2020 Toyota Supra Launch Edition (A90)
Owner: Sam Du
Hometown: Los Angeles, CA
Occupation: Super Street Editor-In-Chief
Instagram: @duspeed
Engine: 3.0-liter 24-valve B58 inline-six; Akrapovic titanium exhaust; AMS Performance 304 stainless 4.5" to 3.5" downpipe; Eventuri carbon fiber intake; Ignition Project Power coils; YMP carbon engine cover
Drivetrain: eight-speed ZF automatic transmission
Engine Management: protuningfreaks Bootmod3 stage 2 tune
Footwork & Chassis: KW Variant 3 coilovers; RS-R EDC canceller
Brakes: Brembo GT-S front big brake kit featuring 380mm two-piece slotted rotors and six-piston hard anodized calipers
Wheels & Tires: 19x9" front, 19x10" rear BBS LM wheels; 255/35R19 front, 275/35R19 rear Yokohama ADVAN Apex V601 tires
Exterior: EVS Tuning aerodynamics featuring carbon-fiber front lip, front splitter, fenders, side skirts, rear lip spoiler and side mirrors; Voltex Type 10SN rear wing; IND painted front reflectors; XPEL full car paint protection and Prime window tint by Premier Auto Armor
Interior: Recaro Pro Racer SPA seats; Bride seat rails; Cusco harness bar; Schroth harness

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