Try the following, and if no joy, I'll put up some more tests:

MAIN ELECTRO-VALVE TESTS

Located in the main brake unit.

All tests performed with ABS ECU unplugged and ignition switched OFF unless stated otherwise.

Resistance Test
-- Connect ohmmeter between ECU connector terminals 11 and 18. Resistance should be between 2 and 5 ohms.

• If resistance is not correct, remove 2-way connector from main electro-valve and check that the resistance across the two terminals is between 2 and 5 ohms.

o If electro-valve resistance is not correct, replace electro-valve.
o If the electro-valve resistance is OK, check for continuity between electro-valve connector (blue/white wire) and ECU connector terminal 18, and between electro-valve connector (brown wire) and earth.

Operation Test
-- Switch Ignition to position I
-- Wait for ABS pump to stop
-- Switch ignition OFF
-- With ABS ECU unplugged, connect short jumper wire between ECU connector terminals 2 & 18
-- Moderately depress brake pedal
-- Switch ignition to position II
-- Brake pedal should be felt to force its way up under the foot and become hard. If not, replace electro-valve.

CONTROL ELECTRO-VALVE TESTS

Located on the passenger side under the battery.

All tests performed with ABS ECU unplugged and ignition switched OFF unless stated otherwise.

Resistance Test 1
-- Connect ohmmeter between ECU connector terminals 1 and 11
-- Resistance should be lower than 1 ohm
-- If value is not correct, check for continuity between ECU connector terminal 11 and electro-valve connector terminal 7 (brown wire), and check that terminal 7 on the electro-valve (corresponding with the brown wire) is earthed.

Resistance Test 2
-- Connect ohmmeter between ECU connector terminals :

• 11 and 15
• 11 and 17
• 11 and 35
• 11 and 33
• 11 and 16
• 11 and 34

-- Resistance for each electro-valve should be between 3 and 7 ohms.
-- If not, remove connector from electro-valve, and check resistance between the following electro-valve terminals (the brown wire is terminal 7):

• 1 & 7
• 2 & 7
• 3 & 7
• 4 & 7
• 5 & 7
• 6 & 7

-- If one of the values is not correct (3 to 7 ohms), replace electro-valve/master cylinder assembly.
-- If the values are correct, check for continuity between control electro-valve connector and ECU connector.

• ABS ECU connector terminal 15 & electro-valve terminal 1
• ABS ECU connector terminal 34 & electro-valve terminal 2
• ABS ECU connector terminal 17 & electro-valve terminal 3
• ABS ECU connector terminal 33 & electro-valve terminal 4
• ABS ECU connector terminal 16 & electro-valve terminal 5
• ABS ECU connector terminal 35 & electro-valve terminal 6