I found this information on the web somewhere but I don't remember where. I cannot verify any of this as I have not tried it, SO BEWARE I can take no responsibility if it screws up your vehicle, still if it's buggered already what have you got to lose.

Diagnosing ABS Faults is actually rather easy.  Here is the basic procedure:


Tools

Small phillips screwdriver
Short peice of wire (6" or so is fine)

The procedure

Turn off the ignition before you start.  Using the screwdriver, Take the side panel off the seat pedestal on the drivers side.  There are 3-4 screws holding it on.  You then need to pull the ABS warning Relay.  Its a small square plug that has a green base and is the relay closest to the front of the seat.

Under the seat, you will find a small 4 pin connector near the back of the seat pedestal.  It is blue.  You want to connect the small wire between two holes.  One hole has a black wire with a pink stripe.  The other hole has a black wire.  Bridge these two together and turn on the ignition.  The ABS light will light, and then go out after 5 seconds.  The ABS light will then start to blink in a pattern.

The pattern is:  Pause, flash, pause, flash.  This signifies the start of the pattern.  Then there will be a 2.5 second pause and then a series of flashes which gives the first number of the code (2-6).  This will be followed by a 2.5 second pause, and then a series of flashes for the second part of the number (0-15).

The sequence of start phase, first and second parts will continue until terminated by the operator, thus allowing the code obtained to be rechecked. To terminate the sequence disconnect the prewired plug from the diagnoostic plug.  Wait for cycle to end before code will clear.  NOTE: Termination will clear the memory of that particular fault.  Do not terminate the sequence if unsure of the code number.

The memory is capable of storing more than one fault.  To search the memory, reconnect the diagnostic plug, and await the next start phase. Repeat procedure until no further faults are stored in the memory.  The memory is cleared when a long pause of 7.5 secs occurs after start phase.


The Codes

Fault Code	Reason	Remedy
2-12 - Front Right	Too Large an air gap, or	Check sensor setting and for damage to
2-13 - Rear Left	sensor has been forced	exciter ring.  Check for rear bearing endfloat
2.14 - Front Left	out by exciter ring
2-15 - Rear Right
4-12 Front Right	Wiring to sensor is broken	Check wiring or fit new sensor
4-13 Rear Left	or sensor resistance is too
4.14 Front Left	high
4-15 Rear Right
5-12 Front Right	Sensor or wiring has	Check wiring
5-13 Rear Left	intermittend fault
5.14 Front Left
5-15 Rear Right
6-12 Front Right	No output from sensor	Check sensor setting.  Fit new sensor bush
6-13 Rear Left	Sensor may have too large	if necessary
6-14 Front Left	an air gap
6-15 Rear Right
2-6 Stop light switch	Faulty switch or wiring.	Check that the pedal returns fully to stop.  Slowly
	Fuse A5 blown or not fitted	operate pedal by hand and check that 2 clicks are
		heard from switch; stop lights come on at first click.
		Otherwise check wiring and fuse
2-7	Continuous supply to ECU	Check wiring and valve
	with ignition off.  Faulty valve
	relay or wiring
2-8	No voltage to ABS solenoid	Check wiring
	valves.  Faulty valve relay or
	wiring
3-0 to 3-9	Open circuit in connection	Check wiring and connectors.  Renew ECU if
	from ECU to solenoid valve	wiring is correct
	in booster, on in ECU
4-0 to 4-9	Short circuit to ground in	Check wiring and connectors.  Renew ECU if
	connection from ECU to	wiring is correct
	solenoid valve in booster
5-0 to 5-9	Short circuit in connection to	Check wiring and connectors.  Renew ECU if
	12 volt in connection from	wiring is correct
	ECU to solenoid valve in
	booster.  Possible ground fault
6-0 to 6-9	Short circuit between two	Check wiring, connectors and booster.  Renew
	connections from ECU to	ECU if no fault found.
	solenoid valve in booster