Steering malfunction after Dyno

[Supra1208]

Hey guys,

I was on a 2-wheel dyno yesterday (only the driven wheels were on the rollers) and unfortunately I didn’t put the car into dyno mode properly.

After the dyno runs, the car started throwing several steering-related errors. The steering wheel is also shaking/vibrating like crazy, and the front wheels are shaking as well — even when the car is standing still.

Has anyone experienced something similar?

Could running the car on a 2-wheel dyno without properly activating dyno mode cause this? Is it possible that I damaged or even killed the steering rack?

Any advice or experience would be greatly appreciated!

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[Razors Edge]

Did they strap the car down by the front wheels?

• Strapping the Vehicle: It is recommended to avoid strapping down by the wheels to prevent damage to the steering system.
• 
  
  Importance of Dyno Mode
  • Traction Control: Disabling traction control helps prevent issues related to wheel speed during testing.
  • Accurate Measurements: Activating dyno mode ensures that the vehicle's systems do not interfere with the performance data being collected.
• How to Activate Dyno Mode
  To enable dyno mode in the GR Supra, follow these steps:
  
  1. Turn Off the Car: Ensure the vehicle is completely off.
  2. Start Button: Press the start button three times within 0.8 seconds without pressing the brake pedal.
  3. Diagnostic Mode: Look for a "Diagnostic Mode" message on the cluster.
  4. Odometer Reset: Hold the Odometer Reset button for 10 seconds until the "Main Menu" appears.
  5. Chassis Option: Cycle through the menu to find the chassis option and hold the button for 2 seconds.
  6. Start Dyno Mode: Confirm the activation of dyno mode when prompted.
• Additional Notes
  • Speed Limiter: While in dyno mode, the vehicle has a speed limiter set around 160 mph.
  • Strapping the Vehicle: It is recommended to avoid strapping down by the wheels to prevent damage to the steering system.

 

[ntfrendlyGR]

I’ve ran mine(6mt) many times with no issue. And I’ve also forgot to put it in Dyno mode several times also no issue. ( it did throw a bunch of stuff up on the info center but it all went away after properly putting it into Dyno mode) Only issue I’ve ever had is the backstrap breaking the rear strut level sensor on the driver side. I try reading the codes and resetting.
Did they strap the front wheels or did they maybe go to the Control arms and grab the rack?

 

[Twisted Tuning]

Technically when on the dyno, you should be using the front tow hook, or the front control arms to strap down, not the wheels.

But, When on the dyno, and strapped to the front wheels, you have to ensure that you or whoever is piloting the car on the dyno does not try to turn the wheel at all or very very minimally. because you will put strain on the steering motor and it will throw it out of alignment. You likely will need to recalibrate the steering to fix, or at a minimum clear all module codes and reset the ecu with Protool or something similar.

 

[Supra1208]

I got a video attached.

we tried to calibrate the Steering but nothing worked.

the dyno guys strapped the front wheels. But i was there 2 times before and we did everything the same and it never happend anything like that now.

 

[Twisted Tuning]

I got a video attached.

we tried to calibrate the Steering but nothing worked.

the dyno guys strapped the front wheels. But i was there 2 times before and we did everything the same and it never happend anything like that now.

steering motor is likely damaged. they probably inadvertently was turning the steering the steering wheel stressing the motor.

 

[Eastwood]

I got a video attached.

we tried to calibrate the Steering but nothing worked.

the dyno guys strapped the front wheels. But i was there 2 times before and we did everything the same and it never happend anything like that now.

That method doesn't work on the Supra. You can only reset the Steering Angle Sensor through Toyota ISTA. I know, I've done it myself when I had an issue after previously having an eBay steering wheel installed, needed an alignment because it was crooked, then got coilovers installed and a bunch of warnings popped up. After a lot of searching I figured out I had to calibrate my SAS to get rid of all the warnings, think it was 7 warnings and it did indeed work.

At the time, only Toyota ISTA could do it, tried the method in your video, ProTools, OBD2 scanner tools, none of them worked.

ISTA will tell you what degree to have your wheel at, what degree to turn it to, hold, etc and that will reset your SAS.

In your case, I see your steering wheel is shaking on start up...have you checked if the steering wheel bolt is tightened to spec?

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