First measured value = 1.81 km/h
Second nominal value = 1.87 km/h
Third nominal value = 1.93 km/h
etc.
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". See: Brakes and Traction Control/Antilock Brakes / Traction Control
Systems/Testing and Inspection/Component Tests and General Diagnostics/ABS 5.3 and ABS/TC 5.3 Systems/Actual Values (Actual Value
Test)
Possible faults (cause in the event of deviation):
- Air gap between speed sensor and gear wheel (pulse wheel) too large or, due to wear (chip formation), too small (check installation).
- Pulse wheel defective or corroded.
- Wheel bearing damage (wheel bearing not adjustable).
- Plug connection in wiring from the speed sensor to the control module or PIN on the control module connector not OK.
Test Point 3
TEST POINT 3
Front Right Speed Sensor, Signal Implausible
DTC 4201
General procedure as for test point 2/diagnostic trouble code 4206 (check speed sensor signal with the Porsche System Tester 2).
- Speed sensor signal: Go to the Actual values menu. There, select the front right wheel speed.
Test Point 4
TEST POINT 4
Rear Right Speed Signal, Signal Implausible
DTC 4211
General procedure as for test point 2/diagnostic trouble code 4206 (check speed sensor signal with the Porsche System Tester 2).
- Speed sensor signal: Go to the Actual values menu. There, select the rear right wheel speed.
Test Point 5
TEST POINT 5
Rear Left Speed Signal, Signal Implausible
DTC 4216
General procedure as for test point 2/diagnostic trouble code 4206 (check speed sensor with the Porsche System Tester 2).
- Speed sensor signal: Go to the Actual values menu. There, select the rear left wheel speed.
Test Point 6
TEST POINT 6
Front Left Speed Sensor, Open Circuit / Short To Ground / Short To B+
DTC 4205
Wire/plug connection between control module and speed sensor not OK (open circuit, short to B+ or short to ground) or the speed sensor itself is
damaged.
- Check the speed sensor wire and plug connection in the wheel area for damage (visual inspection).