When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
After 1 Year of rebuilding my 87' FC Turbo II it was time for a test drive. I noticed that the ABS-Light on the dash lit up after just a few meters of driving. When braking hard, the wheels lock up. So it's clear that the ABS does not work.
As the ABS-Light only turns on when driving the car, I assumed that there would be a issue with the speed sensors. I measured all the sensors and the ABS unit as described in the workshop manual. Everything looks good so far, exept for one speed sensor.
The 3 speed sensors, Front Left, and both Rear sensors works fine. I've measured the signal while a friend was turning the wheel. All signals have about the same amplitude. But the Front Right Sensor have a much higher amplitued as the 3 others but still a perfect sine-wave signal.
I can't figure out, why one sensor works and generates a perfectly sine wave signal, same as the other sensors, but with a much bigger amplitude (about 8x - 10x more).
Since the sensor does not provide the expected voltage, it should be broken, as described in the manual.
But it seems weird to me. I expect a broken sensor to not provied a sine-wave signal or some other weird signals but not just a bigger amplitude.
Does someone had the same issues or know more about the sensors than I do?
I've added some pictures from the workshop manual and of the speed sensor with the gear.
07-31-23, 05:54 AM
