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6.1 Diagnosis - Complaint Related Diagnostic Chart   >   11 Diagnosis - Complaint Related Diagnostic Chart

Complaint/Problem Possible cause Test step/Remedy 1) With light brake pedal applications, the brake pedal pulsates shortly before the vehicle comes to a stop. Voltage at vehicle speed sensor too low, vehicle speed sensor cable has intermittently open circuit 23 8.0-13.0, 17.0, 20.0, 23.01) ABS malfunction indicator lamp comes on and stays on while driving Speed sensor wire interrupted 23 8.0-13.0, 17.0, 20.0, 23.01) ABS malfunction indicator lamp comes on and goes out again while driving Battery voltage < 11 V, too many electrical consumers in operation, poor ground 23 3.0 ABS malfunction indicator lamp is on, charge indicator lamp is off Generator defective (1 diode) Test generator ABS malfunction indicator lamp and charge indicator lamp are on Generator defective (2 diodes) Test generator ABS malfunction indicator lamp does not go out when engine is started ABS control module (N30) connector not connected Poor contacts in control module connector Overvoltage protection relay module defective, fuse blown 23 1.0, 3.0 ABS malfunction indicator lamp does not light up with ignition on Diode in solenoid valve relay defective, bulb defective 23 7.0 Return/pressure pump motor with ignition key removed Return/pressure pump rely (A7k2) stuck closed Check return/pressure pump relay (A7k2) ABS malfunction indicator lamp comes on at higher speeds (approx. 35 mph) and stays on Rear axle vehicle speed sensor or toothed wheel defective or damaged 23 12.0, 13.0, 23.0 1) Observe Preparation for Test, see 22.