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Mercedes Benz
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1985
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300SD 722.416
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Repair and Diagnosis
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Brakes
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Traction Control
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Anti-Lock Brake System
Anti-Lock Brake System
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Description
Operation
Hydraulic Unit
Speed Sensor
Electronic Control Unit
Notes
Signal Conditioning Section
Logic Section
Safety Circuit
Test Cycle (BITE)
Harness With Relay & OVERVOLTAGE Protection
Control Cycle (One Wheel)
Trouble Shooting
Abs Control Light
Control Lamp Lights Up Intermittently, Will Not Go Out Unless Ignition Switch Is Cycled Off And On
Control Lamp Lights Up, ABS Operates Brake System Normally
Control Lamp Lights Up Intermittently
Light Braking Pedal Pulsation (ABS Control Lamp Does Not Light Up)
Testing
Testing With BOSCH Tester
Notes
Connecting Tester
Battery Test
Test 1
Testing Valve Relay In Rest Position
Test 2
Testing Contacted Valve Relay
Test 3
Testing Relay For Motor Of Return Pump In Rest Position
Test 4
Testing Return Pump Motor Relay
Test 5
Notes
Testing Overvoltage Protection
Test 6
Testing Internal Resistance Of Solenoid Valves
Tests 7, 8 & 9
Test 7
Test 8
Test 9
Test 10
Testing Internal Resistance Of Speed Sensor
Test 11
Testing Insulation Resistance Of Speed Sensor Against Ground
Test 12
Testing Insulation Resistance Of Speed Sensor Against Supply Voltage
Test 13
Testing Electronic Control Unit (Internal Electronic Voltage)
Test 14
Testing Function Of ABS Indicator Lamp
Test 15
Testing Function Of ABS Indicator Lamp (Diode In Locking Direction)
Test 16
Notes
Testing Electronic Control Unit, Completing Test Cycle.
Test 17
Testing Electronic Control Unit Test Cycle With Input Of A Simulated Fault)
Test 18
Notes
Testing Electronic Control Unit Current To Solenoid Valve "Pressure Holding Stage")