ABS- light on 230CE
 

Hello!

My best friend have an -92 230CE, and his ABS- warning light comes on in the same second he starts the car. We have used my 320TE as a reference car, and measured the ohm on the solenoids to be 1,2ohm on both cars, but when we measured between the chassis of the ABS pump and pin no. 9 on the connector( this should be the return pump) we measured a value of 0,0ohm on my car, who is working just fine. On my friend's 230CE we measured a value of 4,4ohm. What could be wrong?
We have tried another head unit, without that solving the problem.
We don't suspect it to be the OVP relay, because the car is idle smoothly and there are no other symptoms on the car. The ASD is also working, and the front wheel sensors are ok.

Best regards