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Home >> Porsche >> 2003 >> 911 Carrera 4S, Standard >> Repair and Diagnosis >> Brakes >> Anti-Lock Brakes >> Anti-Lock Brake System (Abs) - 5.3 & Abs/TC 5.3, Diagnosis - 911 CARRERA (996) >> ABS 5.3 and ABS/TC 5.3 systems >> Fault overview / troubleshooting (diagnosis / test plan) >> Test point 2 >> Further to test 2

Further to test 2

Display all four wheels in the Tester display. Drive straight ahead at a uniform speed of approx. 2-4 km/h and have a second person observe the Tester display. Required display: Deviation between the wheel speeds of the four wheels max. 1 km/h. 

Further details about tests 1 and 2 are given under "Actual values menu" on P. 45 - D38.

Possible faults (cause in the event of deviation): 

  1. Air gap between speed sensor and gear wheel (pulse wheel) too large or, due to wear (chip formation), too small (check installation).
  2. Pulse wheel defective or corroded.
  3. Wheel bearing damage (wheel bearing not adjustable).
  4. Plug connection in wiring from the speed sensor to the control module or PIN on the control module connector not OK.
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