Thread: sierra sapphire abs fault
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Old Mar 6, 2011 | 07:59 PM
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jon@work
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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
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