Fault, DTC Possible causes, elimination, notes · Test point 13

911 Carrera (996) Anti-lock brake system diagnosis Fault, DTC Possible causes, elimination, notes Test point 13 Stop light switch -Check with the System Tester 2 via the "Input signals" menu. DTC 4340 Press the brake pedal after selection of the sto~ight switch. Requireddisplay: Displayon screen changesfrom "not actuated" to "actuated". Pull off wires on the stop light switch (No.1). Test the stop-light switch with a multimeter (remove switch for the test if necessary), 620_1_96 Check stop.jightswitch adjustment(operating point) (see Volume4, Runninggear, Repair Group 46). Check wiring according to the wiring diagram. Test point 14 Wrong gear wheel The ABS gear wheels possess 48 teeth. Not all 48 teeth are DTC 4225 detected during a revolution of the wheel. Check ABS gear wheels (clamping pins on the front axle / pulse strip on the rear axle) for dirt or damage. Replace damaged parts. Check wheels and tyres (extreme tyre differences or impermissible wheel/tyre combination), 45 02 Diagnosis/Troubleshooting 45 -D 31 Printed in Germany -12, 1998 99645D15