From time to time Iíve tried to understand the traction control system. Initially people said it was just a dumb mechanical unit that closed the air flap to slow the car down.
Iíve since learnt that step is just the second of the three settings the abs TC ecu can call for
1st. Application of the brakes but if that doesnít help then
2nd Reduction in the amount of air entering the engine via the secondary throttle, but it that doesnít help
3rd Request for a reduction in engine torque via the can bus system
I havenít noticed this extra can bus link on the non TC abs units. Nor do I know whether this communication is checked during the first initialisation procedure, but would guess so as itís part of the redundancy
Wondering if your error is pointing to a failure in communications between the abs TC ECU and the Engine Management ECU.
Someone understands this any better?
Great post, yes I agree, there is more to this system than meets to eye !!
This is how I see it, startup sequence ,ECU sends signal to traction control actuator unit,that activates and pulls the flap closed and then releases it.This action is detected by a rotary pot (sensor)on the left hand side of the throttle body (drivers side) and then sends a response back to the ECU.
I pulled out the sensor and cleaned it as much as I can (its semi sealed) but still no joy.Maybe the sensor is shot.
Be interesting to see if somone knows the pot values so we could measure them for resistance.
I notice it looks identical to the sensor (throttle position) on the other side of the throttle body so not sure if they are inter changable or not
Im going back into the ECU using TOAF as I have some vague recollection the the traction control box was ticked "disabled"
on the menu.
As far as I can see,unless some other thing in the car (airbag light etc) makes the screen throw up the TC light NOT SURE.
but I did try to spin the front wheels on some sand but interestingly the traction control did not kick in at all as it does in both my other cars.
This would suggest either the wheels are not detecting the spin or sending the signal or the system (ecu ?) may not be receiving the the signal ??