DTC 42

DTC 42 No.1 Vehicle Speed Sensor Circuit




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

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 engine control module. The ECM determines the vehicle speed based on the frequency of these pulse signals.


OSCILLOSCOPE WAVEFORM

Waveform between terminals SP1 and E2 when vehicle speed is approx. 20km/h (12mph). As the vehicle's speed increases, the signal output from SP1 increases.:

WIRING DIAGRAM





INSPECTION PROCEDURE