Hi having a problem with my abs light on my sapphire 4x4. comes on as normal and stays on. checked absolutely everything i can think of. Have continuity of around 1020 ohms on all sensors, and all wires from sensors to abs ecu are fine. also fluid level sensor is fine. green abs relay is ok and so is the fuse. only way i can get the light to go off is to take the lid off the green relay and bridge the contacts, so obviously power is not goin to the relay to activate it. anyone got any ideas? help would be really appreciated.

 

Ive got a few wiring diagrams if you need them.I had a similar fault with my light staying on.It went off on its own but i checked all the relays and fuses.

 

MAIN ELECTRO-VALVE TESTS

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

-- 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.

CONTROL ELECTRO-VALVE TESTS
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 (LH front inlet valve)
• 2 & 7 (LH front outlet valve)
• 3 & 7 (rear inlet valve)
• 4 & 7 (rear outlet valve)
• 5 & 7 (RH front outlet valve)
• 6 & 7 (RH front inlet valve)

-- 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

 

John u must know that off by heart now lol.

 

i know a fair bit of it off by heart all right. lol. thanks for the help. i'll check it out and let you know how i get. Cheers. Darren.

 

The ABS light on my 4x4 Saff Cossie came on with ignition and stayed on at all times. I swapped the ABS ECU for a 2nd hand one and the problem disappeared.

 

Im gonna check my abs fault on my car this weekend. Hopefully i can fix it.

 

My light usually stays in when I have knocked One of the connections near the master cylinder when I take my turbo heat shield out to clean it. Have you checked them?

 

just to let you know got my abs fixed. turned out to be the abs ecu. checked a couple of second hand ones and turns out its a fairly common problem for them to go faulty. Thanks for the help.

 

Nice one mate.I found the fault for my abs light staying on.There is no resistance in the osr sensor.Looks like i will have to spend more money.