After driving through a downpour about 3 days ago, the ABS and brake warning lights illuminated and a steady continuous and extremely irritating warning tone started. The brake pedal also has a slow oscillation in that when first pressed it goes down quite a way but then starts to resist the applied pressure. This morning, not know what might be causing this, I checked the resistance across each wheel speed sensor and looked at the wiring and connectors. I got about 23 ohms on each side at the rear and 30 ohms at each side at the front. I'm guessing this is about right. Would anyone be able to offer advice on what to check next?
The wheel speed sensors probably detected some wheel slippage or maybe deceleration after the wheel hit a puddle or something. Unless you have further symptoms or warning lights I wouldn't be concerned.
I'll add that after 3 days I still have the problem. Went to see a buddy who lives about 15 miles away in the hope that his code reader would reveal what codes might have been generated. No luck. Also pulled the ABS fuses while I was there, and disconnected the battery and left it disconnected for about 15 mins when I got home. Still have the lights and the warning buzzer after the battery was reconnected..
The skid control ECU does not reset DTC merely via removal of 12V battery power. You need to clear the DTC using a code reader or else a jumper applied to pins 4 and 13 of the OBD-II socket. There are several posts about how exactly to do that. Ideally, you would read the DTC first using Mini VCI. However, if your car has a real problem then the DTC will come back.
First, I hope you're not driving the car with this problem. The annoying buzzer is there for a reason. Have you received the letter from Toyota about the warranty enhancement on the brake actuator? You might get a freebie out of this one.
