Today at Atelier Kaz - ex-Honda R&D, F1, Indy/CART engineer

Time to test drive the car before replacing the Front Brake Disc.

After the brake pedal kick back issue was improved by replacing the Right Drive Shaft and wheel speed sensor, I was hoping to completely solve this by working on the Left side…



Too easy ….


After the ABS upgrade and before removing the Left Drive shaft, I test drove the car to confirm that the issue was still there and nothing to do with the original ABS controller.


After replacing the Left side components, I test drove the car and unfortunately, the issue was still there .


The wheel speed signal quality at the Rear R & L were improved and perfect now.

The upgraded ABS controller has more brain power and there are several new failure detection algorithms.

Because of these, it managed to trigger ABS error #14 which was the signal quality issue at the Front Left.



There was no TCS warning so I knew this is different from the simple issue of wheel speed sensor open/short circuit mode.

Also, the issue happens only at very slow speed almost when the car is about to stop so it is very unlikely to be intermittent short/open circuit mode or wires scratching against something as nothing happens at higher speed.

Both the original and latest ABS controllers were showing the same issue so it’s not something new with the ABS upgrade.



Based on these facts, I asked the owner to let me open both Front wheel hubs to check the condition of trigger disc, speed sensor and the sensor fitting.

As I had to remove the brake calliper for replacing the front brake disc, it was best to do it at the same time.



As the issue was caused by the signal quality, I was expecting not much findings by opening the hub but at least, I wanted to check the condition of each components.





There were several salt like debris inside but both components at FR and FL looked fine.

Although there was no open/short circuit, I also checked all four sensors and they were all within the 847 – 850 ohm window at 5degC.



Best to monitor the signal using the hand held oscilloscope but that will be the next stage.


I thought about swapping the sensors between this NSX and mine but without having the spare sensors, I decided not to do so.

The corrosion at the sensor housing on this NSX was quite severe that I didn’t have enough confidence in removing it without any damages.


So, challenge continues....