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Mercedes Benz
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1989
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560SL
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Repair and Diagnosis
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Brakes
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Anti-Lock Brake System
Anti-Lock Brake System
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Description
Operation
Hydraulic Unit Operation
Speed Sensor Operation
Electronic Control Unit Operation
Notes
Signal Conditioning Section
Logic Section
Safety Circuit
Test Cycle (Bite)
Harness With Relay & OVERVOLTAGE Protection Operation
Control Cycle (One Wheel) Operation
Pre-Diagnosis Inspection
Trouble Shooting
Abs Control Light
Control Light Illuminates Intermittently (Will Not Go Out Unless Ignition Switch Is Cycled "OFF" & "ON")
Control Light Illuminated, ABS Operates Brake System Normally
Control Light Illuminates Intermittently
Light Braking Pedal Pulsation (ABS Control Light Does Not Illuminate)
Testing
Notes
Connecting Tester
Test 1
Testing Relay & Valve Relay In De-Energized Position
Test 2
Testing Voltage Supply
Test 3
Testing Valve Relay
Test 4
Testing Diode In Hydraulic Unit
Test 5
Testing Internal Resistance Of Speed Sensor
Test 6
Testing Insulation Resistance Of Speed Sensor
Test 7
Notes
Testing For Interchangeability
Test 8
Testing Internal Resistance Of Solenoid Valves
Test 9
Testing Pressure Holding Of Solenoid Valves
Test 10
Testing Pressure Reduction Of Solenoid Valve
Test 11
Notes
Testing Overvoltage Protection Relay
Removal & Installation
Hydraulic Unit R & I
Removal
Installation
Front Wheel Speed Sensor R & I
Removal
Installation
Rear Axle Speed Sensor R & I
Removal
Installation
Electronic Control Unit R & I
Notes
Removal & Installation
Relays & OVERVOLTAGE Protection R & I
Removal & Installation
Wiring Diagrams