DTC 42

CIRCUIT DESCRIPTION
The No.1 vehicle speed sensor outputs a 4-pulse signal for every revolution of the rotor shaft, which is rotated by the transmission output shaft via the driven gear. After this signal is converted into a more precise rectangular waveform by the waveform shaping circuit inside the combination meter, it is then transmitted to the ECM. The ECM determines the vehicle speed based on the frequency of these pulse signals.





DETECTING CONDITION AND TROUBLE AREA

HINT: In test mode, diagnostic trouble code 42 is output when vehicle speed is 5 km/h (3 mph) or below.





Reference:
Waveform between terminals Sp1and E1 when vehicle speed is approx. 20km/h (12 mph).

HINT: As the vehicle speed increases, the number of signals from Sp1 increases.





DIAGNOSTIC CHART





WIRING DIAGRAM








INSPECTION PROCEDURE