Having an issue with the anti-skid....the stop light is allways on, have to disconect the battery . As per the service manual, and some voltage test done, it should come from the skid control ecu...But where is located this ECU skid control?...not mentioned in the service manual..not sure but may be near the power brake in the engine compartment...
No. The built in skid ecu is one reason used brake boosters sometimes don’t work. The code is different between years, models like hatchback vs a v wagon and even tire size.
need to change the complete master booster cylinder with it. Just found this on how to remove the ecu: Firstly, removed the firewall [can find video instructions on the web], it was simply removing the wiper blades and two lock pins in top plastic part. Then remove wiper motor assembly. Then un screw 12 bolts to remove steel cover. Then ECU can be seen parallel to the brake pedal. Before dealing with the ECU it’s a good idea to remove the negative terminal of battery. [or you can keep the drivers door open during the process and keep the key far away from the car so there is no brake pressuring during the time. Yes, car has to be off during the time. Remove two bolts in the brake fluid reservoir bracket and clear the way to ECU. Remove the communication cable connected to the ECU. Remove two hoses from brake reservoir to ECU. It’s a good idea to block the hose, while its disconnected. And the un screw the brake 4 distribution steel pipes using 10’ key and the pressure line [red pipe]. Now dip below the steering wheel and remove the below plastic cover. And unscrew the 4 bolts around brake pedal. These bolts attaches the ECU to the chassis. This is the most time consuming and toughest work out of all, required lot of patience. Remove the brake light switch and then remove the pin and the, which goes across the brake pedal lever. Now we can take the ECU out. Now go in the reverse order to fix the new ECU. Now dip below the steering wheel and remove the below plastic cover. And unscrew the 4 bolts around brake pedal. These bolts attaches the ECU to the chassis. This is the most time consuming and toughest work out of all, required lot of patience. Remove the brake light switch and then remove the pin and the, which goes across the brake pedal lever. Now we can take the ECU out. Now go in the reverse order to fix the new ECU. I faced the difficulty since it was a LHD ECU and the car is RHD. It was the drivers side front wheel brake pipes giving problem to fix. But go ahead and bend the pipe if you face the same situation. Prior connecting the Communication cable, make sure your reservoir has fluid at least to mid level. This level will come down soon, since ECU has to be filled with fluid. After everything is fixed. And making sure hoses and pipes are properly tightened. Switch on the car [not ready mode] check for any DTCs. Clear them if theres any. You’ll have to calibrate the linear solenoid valve. Before resetting as in instructions make sure you run the test mode [unless this can cause a huge problem, you might have to look for another ECU]. If its other side ECU [as I experienced] DTCs will say “wrong ECU connected” don’t worry. Switch off the car and restart the calibration. You might have to do this few times. But it should work. Check the fluid level during the process and refill if it goes below mid level. Finally release air from brake lines. Take the car for a test ride. Do some panic brakes straight and while turning to each side. And get comfortable with braking. Monitor the MGP gains and rotor heating for some time, just to ensure its working perfect.
That very old post from an overseas guy has a lot lost in translation. You certainly don’t remove the firewall and his use of “ecu” term for the brake booster (a combination of the master cylinder/abs/skid ecu) was confusing at best and inaccurate at worst. He does not mention the separate brake booster pump which builds hydraulic pressure. You also need Techstream for flushing the many paths inside the booster and for calibration. Brake Booster and Pump