ABS light problem

Whew! Can't help you with the triple light challenge (hopefully someone smarter,than me has that answer), but in the meantime have you checked to see if your new wheel sensor is working? It may not have been a bad sensor...dirt on the reluctor could also cause a malfunction. If you have a computer with a Mic input, download an oscilloscope app, disconnect the cable out of the sensor and wire it to the Mic input and spin the wheel slowly by hand and see if you get a up and down wave. If you can't pull that off, hook the sensor up to a digital multimeter, put it on " voltage" and spin the wheel VERY slow. You should have 0 volts at rest, but as you turn the wheel you should get intermittent low voltage readings with an alternating + and - sign in front of those numbers. If you spin the wheel too fast the multimeter will just average it out which equals zero. If that checks out you might check the other wheels just to be sure they're functioning properly.

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Did you use Ferrari OEM parts for the exhaust upgrade, Janice? Some aftermarket exhaust parts may activate the CEL (engine) light. If the parts are causing problems, there are some workarounds (some expensive, some not so expensive).

An OBD-II reader is invaluable when diagnosing CEL lights.

Regarding your question on the technical forum... SD 1 and Leonardo scanners are usually far too costly for the average Do-It-Yourself mechanics.

Regarding the ABS... Simple wiring checks are all that may be required (to make sure everything is hooked up properly in the ABS system). Pin 7 and pin 25 on the ABS module plug are hooked up to the Left Rear Wheel Speed Sensor.

I'm surprised your car has a Teves system. I didn't realise Teves was fitted to 5.2 cars.

 

Please don't cross-post the same issue in different forums. See my answer to your problem in the Technical Q & A forum.

 

Brian, I requested that Janice post here to get a more model-focused response (I mentioned that in my first message on the Technical Q&A Forum). My apologies.

 

Actually, I was simply unaware of 5.2's having Teves. I have no evidence to support it I can't imagine anyone retrofitting a '97 model with an older ABS system. It must have come as standard.
I currently have a CEL light on my 5.2. This is partly due to my cats being gutted and the engine computer sensing that there is no cat material inside. The light only illuminates on the 2nd or 3rd run. If your cat(s) are original, then most likely something else is causing your CEL.

 

The comment no 5.2 system is fitted with Teves ABS is incorrect. 1996 and some 1997 F355 came with Teves ABS systems. It is later models that went to the vacuum assisted regular booster brake system. I have seen and worked on both systems on 355 models. The master cylinder was even changed to add a bleed port on the later system.

 

Quote:
Good to hear that 1996 and some 1997 F355...
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You won't think it is so good when you have to replace the ABS pump ($3000) or find that absolutely no one will agree to rebuild your Teves quirky master cylinder. Ferrari finally went to the Bosch system for easy of service.

 

Just be aware, regarding ABS, the computer doesn't always diagnose the problem correctly:
I was looking for examples earlier, but couldn't find them:

This was just posted....

https://www.ferrarichat.com/forum/posts/145634851/