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[terry paget]

T reg 2 litre petrol manual saloon
This car had ABS light coming on, so today I changed the ABS ECU for one off a similar car I scrapped last year. I had put the new ECU on the pump block when I thought it would be good to get a photograph, so I removed it again. I took a photograph, then realised that I had two identical ECUs sitting on the bench. I did not know which was which. I gambled that the ECU with a little power steering fluid on it was the one I had removed, so I installed the other one.

Went for a test drive, and the ABS light came on. Bother.

I removed the ECU again. The spare ECU had come off a V reg car so presumably was the younger. The labels read as follows: The one I had installed read BOSCH and a bar code; on right 04527
on bottom 965560  0 273 205
The other (left on the bench) read BOSCH and a bar code, 43330 on right
and 871113  0  273  285

I suppose the fault could lie elsewhere, a sensor, cable or a cogged wheel.

Can someone tell me which of these ECUs is the older? Any ideas where the fault might lie? I have known sensors fail, cables fray (on front wheels) and the cogged wheels move about (back only). Would a Tech2 reading help?

[terry paget]

I have just noticed  a difference between the two ECUs. With them sitting with the labels on top and the 8 tubes facing me, 871113 has four prongs top left hand corner, possibly to hold a cable; 965560 lacks this feature.

[terry paget]

I checked with another spare ABS unit from a scrapped car (a T reg 3 litre), it too has the prongs on it, and they hold the wires from ECU to motor.