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abs units only maintain the brake line pressure as set by the brake pedal position and application pressure during wheel lock up prevention
If it activated on it's own accord both rear brakes would have come on if not all 4 wheels
the default action in the event of abs failure is to loose the abs action during wheel lock up and not to lock brakes
Run the fault codes to check for ABS circuit/ sensor problem
discuss the problem with an accredited brake specialist shop as I suspect a problem that is not really connected to the ABS system
You need to clear the check engine light with a scanner. If you clear it and light comes back on check for a new code number. If you bought your parts locally the parts store should scan/clear your codes for free.
The person you have checking your vehicle is a parts replacer. Not a mechanic. He's just hoping to hit it right, eventually. Have someone check the sensors at the rotors my friend. Most likely one is out of position and not picking up the proper message for the computer. Yes, once the light is out, from all the other work he's done, it will come back on each time. That's just the nature of the beast. If it is just a sensor at the rotor out of adjustment, the light wont come back on.
Toyotas and Lexus cars have some unique feaures. If your fuel cap is loose or the O2 sensors on the exhaust are faulty this results in an emission problem and the engine computer unit (ECU) engages the check engine light and disables the VSC (the VSC light comes on to warn you that it has been disabled). However you have p0500 code which says the car has no speed sensor signal. The seed sensor is located on the side of the final drive from the transmission and its job is to measure the speed of rotation of the output shaft. The ECU will compare the signals from this shaft along with the speed sensors in the wheel hubs. If there is a difference between these signals the VSC is engaged to apply braking effort to which ever wheel is slipping (running faster) than the other or that the transmission speed sensor would warrant.
So you either have an emission fault has fed back to the VSC and speed sensor missing (p0500) condition, or you have a faulty sped sensor which has tripped the VSC light and in turn the CEL.
Check your fuel filler cap is on tight, turn radio off and disconnect the negative lead to the battery for 5 minutes (this should clear the ECU memory of the code error). If p0500 error and CEL and VSC lights come back on then check the electrical connection to the speed sensor. Ensure it is clean and making a good contact, check the wiring for continuity. If everything else looks good consider changing the speed sensor.
Did you have the code cleared after you installed the new part because the ECM cannot clear itself, even though you installed a new part and the code is still in the system? You need to have the code erased with a OBD II scanner.
no reset button.have the car anti-lock brake system scanned.to check code.because when anti - lock brake light come on.it can be many things.like faulty wheel sensor.faulty relay or the anti - brake unit low on brake fluid or the abs unit faulty.
Your ABS systems use a combination of electronic and hydraulic systems to modulate the brakes individuallyto prevent them from locking up. Antilock systems consist of wheel speed sensors, a hydraulic control unit (HCU), and an electronic control unit (ECU). Because of how complex the system is your computer does a self-test. If the check is successful, the ANTILOCK and BRAKE lights will go out within a few seconds. If one or more of the component of the ABS system fails to pass one or both lights will remain lit, the system will shut down and set a code. The code itself doesn't tell exactly what component is defective - it only indicates where to look, or what parameter is out of normal range. You or a technician will have to perform further testing to pinpoint cause and the proper repair. Even if you reset the light, if the underlying problem is not addressed it will come back on.
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