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Home >> Sterling >> 1987 >> 825 SL, 2.5 D >> Repair and Diagnosis >> Brakes >> Traction Control >> Anti-Lock Brake System >> Testing >> Hydraulic Modulator Test >> Valve Internal Resistance Test
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Valve Internal Resistance Test

  1. Place valves selector switch in "X" position. Turn valve switch to "Front L". If valve LED light comes on, go to next test. If LED light does not come on, using an ohmmeter, check for continuity between hydraulic modulator and ECU (Yellow/White wire).
  2. If there is no continuity, repair wire. If there is continuity, replace hydraulic modulator. Perform same test in other 3 modes. If LED light does not come on in "Front R" setting, check Red/White wire. In "Rear L" mode, check Yellow/Black wire. In "Rear R" mode, check Brown/Yellow wire.