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Home >> Porsche >> 1990 >> 928 Automatic >> Repair and Diagnosis (Single Page) >> Brakes >> Anti-Lock Brakes >> Anti-Lock Brake System >> Testing >> Program Switch Position 15 >> Diode In Locking Direction (ABS Indicator Light)
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Diode In Locking Direction (ABS Indicator Light)

The digital display should be between 2.5-8.5 volts. If readout is okay, go to PROGRAM SWITCH POSITION 16  . If not, check ABS indicator light and wires. Pull off solenoid valve relay. If ABS indicator light is on, replace hydraulic unit.