Description

DATA TROUBLE CODE: 42

SYSTEM: No.1 Vehicle Speed Sensor Signal Circuit


WIRING DIAGRAM





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 (ECM). The ECM determines the vehicle speed based on the frequency of these pulse signals.

DIAGNOSTIC TROUBLE CODE DETECTING CONDITION

For A/T ONLY
All conditions below are detected continuously for 8 sec. or more.
- No.1 vehicle speed sensor signal: 0 mph (km/h).
- Engine speed: 3,000 rpm or more.
- Park/neutral position switch: OFF
For M/T ONLY
All conditions below are detected continuously for 8 sec. or more.
- No.1 vehicle speed sensor signal: 0 mph (km/h).
- Engine speed: Between 3,100 rpm and 5,000 rpm.
- Engine coolant temperature : 80°C (176°F) or more.
- Load driving.

TROUBLE AREA
A/T and M/T
- Open or short in No.1 vehicle speed sensor circuit.
- No.1 vehicle speed sensor.
- Combination meter.
- ECM
HINT: In test mode, diagnostic trouble code 42 is output when vehicle speed is 3 mph (5 km/h) or below.