Fault, DTC Possible causes, elimination. notes · Test point 2

Fault, DTC Possible causes, elimination. notes Test point 2 Front left Controlmodulereceivesa false/ unrealisticspeedsensorsignal. speed sensor, Procedure: signal implausible DTC 4206 Check the speed sensor signal with the System Tester 2 via the "Actual values" menu. To do this, call up the front left wheel speed. Two tests are possible here. Test 1 with raised vehicle. (Swap of speed sensors and test of the speed sensor signal quality.J Test 2 with vehicle driving straight at approx. 2 -4 km/h. (Comparisonof wheel speed signal qualities with each other.) Test 2 is a better measure of the signal qualitythan is test 1. Further to test 1 To perform the test, manuallyrotate the left front wheel at a speed of approx. 2 -3 km/h (observe display in the Tester screen). Slowlyincrease the speed and simultaneouslyobserve the speed increase(display). Nominal values/required display Speed steps of approx. 0.06 km/h. First display at 1.81 km/h. This means: From the value measured last, the next value must be 0.06 km/h higher or, if the wheel is rotating slower, must be 0.06 km/h lower. The Tester rounds the value down to 0.05 km/h or up to 0.07 km/h in some cases. Example First measuredvalue = 1.81 km/h Second nominalvalue = 1.87 km/h Third nominalvalue = 1.93 km/h etc. 45 -D 24 45 02 DiagnosisfTroubleshooting Printed in Gennanv -12. 1998