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Home >> Mercedes Benz >> 1999 >> ML430 >> Repair and Diagnosis >> Brakes >> Traction Control >> Anti-Lock/Traction Control >> System Tests >> Test 14: Right Front Axle VSS Sensor Output
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Test 14: Right Front Axle VSS Sensor Output

  1. Using Adapter (202 589 03 63 00), connect Breakout Box (129 589 00 21 00) to traction control module. See Figure, Figure or Figure. Raise and support front of vehicle. Turn ignition switch to RUN position. Check voltage between terminals No. 2 and 57 at breakout box while rotating right front tire by hand. Greater than 3 volts (AC) should exist. If voltage is not as specified, check wiring. See WIRING DIAGRAMS . If wiring is okay, go to next step.
  2. Turn ignition switch to OFF position. Disconnect traction control module, leaving wiring harness connected to breakout box. Check resistance between terminals No. 2 and 57 at breakout box. Greater than 5 ohms should exist. If resistance is not as specified, check wiring. See WIRING DIAGRAMS . If wiring is okay check other connected control modules. Check right front axle VSS sensor. Perform TEST 13: RIGHT FRONT AXLE VSS SENSOR INTERNAL/INSULATION RESISTANCE.
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