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Home >> Porsche >> 2004 >> Boxster Base, Standard >> Repair and Diagnosis >> Accessories & Equipment >> Headlights >> Exterior Lights, Lamps, Switches - Diagnosis >> System HBA 01 >> Checking the actual values >> Test point 5

Test point 5

ABS speed 

If 0 km/h is displayed when the wheel is rotated:

  1. Check fuse B9
  2. Switch ignition off and pull off plug on the control module
    • Switch ignition on
    • Rotate the rear left wheel by hand and measure the voltage (AC range) between terminal 11 and ground

      Voltmeter display greater than 1 V

If the wheel speed signal is present at the control module, replace the control module. If the wheel speed signal is not present at the control module, check the wire for open circuit or short to ground and check the ABS or PSM control module.