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Home >> Mercedes Benz >> 1986 >> 560SEC >> Repair and Diagnosis >> Brakes >> Traction Control >> 1983-88 & 1991 Brakes - Anti-Lock Brake System - 190E, 190D, 240D, 260E, 300CD, 300CE, 300E, 300D, 300SD, 300SDL, 300SEL, 300TD, 300TE, 350SD, 350SDL, 350SL, 380SE, 380SEC, 380SEL, 380SL, 420SEL, 500SEC, 500SEL, 560SEC, 560SEL, 560SL >> Testing >> Test 4 >> Testing Diode In Hydraulic Unit

Testing Diode In Hydraulic Unit

  1. Ignition on. Rotary switch to position 2. Multimeter set to DC volts position.
  2. Reading should be 0.4-1.5 volts. If less than 0.4 volts or greater than 1.5 volts, go to step 3).
  3. Check and replace valve relay or diode of hydraulic unit. Check connecting lines.
NOTE: If ABS indicator light goes out upon replacement of hydraulic unit with the ignition on and engine not running, replace Electronic Control Unit.
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