ABS MK II - VWClub.BG

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- Ignition on.- Press brake pedal.* Wheel blocks.- Press button.* Wheel can be turned.- Ignition off.- Disconnect button.Note: Switch-on duration of solenoid valves max. 10 s.Check pressure holding, front right wheel:- Connect up button of KDAW 9975 to controller plug term. 2 to 15.- Ignition on.- Press button.- Press brake pedal.* Wheel can be turned.- Release button.* Wheel blocks.- Ignition off.- Disconnect button.Note: Switch-on duration of solenoid valves max. 10 s.Check pressure reduction, rear axle:- Connect up button of KDAW 9975 to controller plug term. 2 to term. 17 andjumper term. 17 with 33.- Ignition on.- Press brake pedal.* Wheel blocks.- Press button.* Wheel can be turned.- Ignition off.- Disconnect button.Note: Switch-on duration of solenoid valves max. 10 s.Check pressure holding, rear axle:- Connect up button of KDAW 9975 to controller plug term. 2 to 17.- Ignition on.- Press button.- Press brake pedal.* Wheel can be turned.- Release button.* Wheel blocks.- Ignition off.- Disconnect button.Note: Switch-on duration of solenoid valves max. 10 s.Function, main solenoid valve:- Connect up button of KDAW 9975 to controller plug term. 2 to 18.- Ignition on.- Press brake pedal slightly.- Briefly press button several times.* Brake pedal must pulsate.- Ignition off.- Disconnect button.If set values are not attained:- Use circuit diagram to check leads for loose contact and open circuit.- Check for leaks in hydraulic connections (visual inspection).- Pull off plug at hydraulic modulator.- Check plug and spring contacts for corrosion.- Check ground connection of hydraulic modulator (both screw connections).- Check ground connection of pump motor.Check wheel-speed sensors and ring gear- Ignition off.- Detach controller plug.- Start engine.- Measure with Motortester special input at controller plug.* Wheel, front left term. 5 and 23* Wheel, front right term. 7 and 25* Wheel, rear right term. 4 and 22* Wheel, rear left term. 6 and 24Set value: Picture, sinusoidal signal1 = Wheel-speed sensor2 = Ring gear3 = Motortester oscilloscope
ADDITIONAL TEST STEPS* Specified tire size fitted?* If ABS warning lamp lights up from time to time when driving (e.g. afterswitching on loads) and goes out again automatically, check battery andvoltage supply (alternator, regulator and voltage dips).* Check tightness of ground strap between engine block and vehicle frame.* Spring contacts must be properly engaged.* All plug contacts ok?Perform test drive as final check:Drive for at least 1 min. at a speed of in excess of 40 km/h.Warning lamp must not light.- Turn corresponding wheel.If available, drive wheels on brake dynamometer (maximum speed and rockvehicle heftily).Note: The wheel-speed-sensor output signal must produce a sinusoidal curve,the amplitude and period of which change as a function of rotational speed. Theamplitude is additionally influenced by the air gap. It decreases with increasingair gap.The maximum permissible fluctuation in amplitude for all wheel-speed sensorsis 25 %.In the event of deviation, check:- Wheel-bearing clearance.- Ring gear for freedom of movement, eccentricity error and damage.- Air gap at several locations.- Wheel-speed-sensor lead for loose contacts.- Interference voltage in ABS wiring harness (e.g. distance from ignition cablemust be more than 5 cm).A test drive is to be performed after repairing the ABS system. In doing so,drive for at least 1 minute at a speed in excess of 40 km/h.Then read out flashing code to ensure that there are no further faults in the ABSsystem.SET VALUESABS inlet solenoid valves- Set value: 5...7 OhmABS outlet solenoid valves- Set value: 3...5 OhmABS main solenoid valve- Set value: 2...5 OhmNote: Winding resistances at -10...+120 Grad C ambient temperature.Solenoid, motor relay- Set value: 50...100 OhmSolenoid, valve relay- Set value: 50...100 OhmSolenoid, wheel-speed sensor- Set value, front: 0,8...1,4 kOhm- Set value, rear : 0,8...1,4 kOhmNote: Winding resistances at -10...+120 Grad C ambient temperature.Switching ranges of 5-pole pressure warning switch:- S2 pump motorCut-out pressure: 170...190 barRenewed cut-in pressure: 130...150 bar- S3 ABS warning switchCut-in pressure: 120...150 barRenewed cut-out pressure: 100...110 bar
Page 3 and 4: Either the accumulator pressure or
Page 5 and 6: - Ignition off.- Pull plug off cont
Page 7 and 8: - Check wheel-speed sensor and lead
Page 9: - Dissipate accumulator pressure.*
Page 13 and 14: B1 = Wheel-speed sensorHL = rear le
Page 15 and 16: Fuse location:16 = Fuse, ABS warnin
Page 17: Wheel-speed sensors/ring gear, fron

ABS MK II - VWClub.BG

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