DTC 42 - Vehicle Speed Sensor Signal
The No. 1 vehicle speed sensor outputs a 4-pulse signal for every revolution of the rotor shaft, which is rotated by transmission output shaft. ECM determines vehicle speed based on the frequency of these pulse signals.
DTC 42 is set when following conditions are detected continuously for 8 seconds or more:
- On vehicles equipped with A/T, No. 1 vehicle speed signal reads zero MPH with engine speed at 3000 RPM or greater and with P/N switch off.
- On vehicles equipped with M/T, No. 1 vehicle speed signal reads zero MPH with engine speed at 3000-5000 RPM, engine coolant temperature at 176°F (80°C) or greater and with drive wheels turning (driving load).
Check for open or short in No. 1 vehicle speed sensor circuit, a faulty No. 1 vehicle speed sensor, a faulty combination meter or ECM.