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Home >> Porsche >> 1990 >> 928 Standard >> Repair and Diagnosis >> Brakes >> Traction Control >> Anti-Lock Brake System >> Testing >> Program Switch Position 1 >> Solenoid Valve (Neutral Position)
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Solenoid Valve (Neutral Position)

Test is okay if Lamp 3 (Green) comes on. Go to PROGRAM SWITCH POSITION 2. If Lamp 4 (Red) indicator light comes on, check following: