Hi all,

First of all not sure if this is in right forum sorry.

Got this zafira automatic in today and when driving under slightly heavy acceleration the Traction Control light starts flashing and the vehicle looses power until vehicle slows down, light goes out and power is restored.(wheels not trying to spin at all)

I have checked both front wheel speed sensors on live data and both seem to be identical and no glitches (graphing)

I have scoped the sensors on the ramp and again both appear to be normal.

Just to add, this is the first time I have scoped the vauxhall ABS sensor that is housed within the wheel bearing, I have been told before and was under the impression that there was a slighy current put through the sensor, but the signal appeared to be a normal analog AC wave. Am I testing it correctly? I tested it same as inductive ABS sensor but with scope ground on chassis.

I have activated and tested all ABS and TC solenoids via modis and all seem to be functioning correctly. ie, brakes applied when activating TC solenoids with out brake pedal pressed and opposite with ABS solenoids activated.

The codes as above were cleared and have not returned after 5 test drives constantly re-enacting the fault (just so you know)

When in ABS system with scanner, TC +ABS lights illuminate on the dash and system is de activated the problem does not occur.

Also there is no deviations in wheel speed sensor output from one an other at higher speeds on live data and appear to be opperating normally even though it wont let me re-enact the problem.

Live data in engine ecu.
Throttle flap closes (not fully)
airflow and injection duration decreases
engine speed drops
So it seems traction control is doing its business.

I am going to scope the sensors tomorrow on the road with the problem occuring.

Any advice with this problem or tips on testing these sensors would be much appreciated as I think it may be sensor fault.

Thanks in advance

james