Long story short, I removed engine and gearbox, the only thing on the brakes I disturbed was removal of front calipers, which I plugged the pipe's and re-bled on fitting.

At first road test I had the pedal jumping back at me from 10-0mph only. The red light and abs yellow light would come on.

I've fiddled about with the wires and float, the switch seems to work good. The pump primes and clicks of once under pressure.

I have swapped the ABS ECU for a spare, results are the same. I have ran 1 litre of brake fluid through front and rear calipers, all is good and clear.

Now the red light (low pressure) no longer comes on when driving but the yellow abs light comes on at random and goes out at random. The pedal has a normal feel, I've covered 128 miles with no further issue.

1. what is the resistance between terminals 11 and 18 (ECU unplugged, ignition off) ? 004
2. what is the resistance between terminals 11 and 1 (ECU unplugged, ignition off) ? 0
3. what is the resistance between terminals 11 and 15 (ECU unplugged, ignition off) ? 005
4. what is the resistance between terminals 11 and 16 (ECU unplugged, ignition off) ? 003
5. what is the resistance between terminals 11 and 17 (ECU unplugged, ignition off) ? 006
6. what is the resistance between terminals 11 and 18 (ECU unplugged, ignition off) ? 003
7. what is the resistance between terminals 11 and 33 (ECU unplugged, ignition off) ? 003
8. what is the resistance between terminals 11 and 34 (ECU unplugged, ignition off) ? 003
9. what is the resistance between terminal 9 and earth (ECU unplugged, ignition off) ? 1
10. what is the resistance between terminal 10 and earth (ECU unplugged, ignition off) ? 1
11. what is the resistance between terminals 1 and 3 (ECU unplugged, ignition off) ? 000
12. what is the resistance between terminals 1 and 20 (ECU unplugged, ignition off) ? 000
13. what is the resistance between terminals 1 and 8 (ECU unplugged, ignition off) ? 068
14. what is the voltage between terminals 1 and 2 (ECU unplugged, ignition on) ? 12.12v
15. with ECU unplugged and ignition off, temporarily join terminals 2 and 8 with a jumper wire. With ignition on, what is the voltage between terminals 1 and 3 = 12.28v and 1 and 20 = 12.17v

RH rear sensor : Connect ohmmeter between terminals 4 and 1 of ECU. Infinity
LH rear sensor : Connect ohmmeter between terminals 6 and 1 of ECU. Infinity
RH front sensor : Connect ohmmeter between terminals 7 and 1 of ECU. Infinity
LH front sensor : Connect ohmmeter between terminals 5 and 1 of ECU. Infinity

All sensors show 1050 - 1100ohms resistance
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Does this help?https://passionford.com/forum/ford-s...ossie-abs.html Note I have a whole lot of diagnostic info including a Ford ABS Manual.

PM me if you want more and I will e-mail you some stuff.

 

 

I don't know how the cossie system works but I had this on an old rover, the abs would pulse the pedal just before you stopped. Turned out one of the toothed abs rings on the driveshaft was cracked thus opening the gap between 2 of the teeth.

 

Mike I've got a few spare sensors if you need to borrow them to try.

 

 

 

Hello i have a same problem...


coming back from ford fair direction paris then I live in France ... my red light then lights up the yellow by pressing the brake pedal. I change the pressure accumulator (black ball) nothing the probes on the abs box nothing either. i look at my abs sensors they are good visually ... the worst is that without touching anything it lights up ...

 

 

can you email me what inf you have on the abs system, nothing is fixing mine
killa_paul@hotmail.com

 

Rich is right, there is a 'ring' on each wheel, the hall effect sensor generates a voltage when the teeth pass it.

It works by detecting a discrepancy between them, thus indicating wheels are about to lock, it in turn activates to prevent this.

If the sensors are clean then there may be some dirt in the teeth which is causing an erroneous reading, thus causing the ABS to activate.

Martin