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Home >> Porsche >> 1990 >> 928 Automatic >> Repair and Diagnosis >> Brakes >> Traction Control >> Anti-Lock Brake System >> Testing >> Program Switch Position 6 >> Left Front Control Valve (Internal Resistance)

Left Front Control Valve (Internal Resistance)

  1. Turn ignition on. Press "VL" button. Digital display should read between .7-1.7 ohms. If okay, go to RIGHT FRONT VALVE (INTERNAL RESISTANCE) test. If not, go to step 2).
  2. Check internal resistance and continuity between terminals No. 2 and 32 of disconnected control unit plug. Repeat test between terminals No. 4 and 1 on hydraulic unit. If test is not okay, replace hydraulic unit and repeat test.
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