Vehicle speed sensor (Mitsubishi Matrix)

The acceleration sensor is used to detect road irregularities. The sensor signal is used by the engine control unit to prevent erroneous misfiring. The vehicle speed sensor is a Hall sensor mounted opposite the gearbox output shaft. The sensor converts the gearbox shaft rotation frequency into a pulse signal sent to the engine control unit.

Conditions for storing fault codes

At P1307

The ECU stores a fault code in memory and turns on the engine management system malfunction indicator lamp if the acceleration sensor signal voltage is below 1.5 V or above 3.5 V in two driving cycles.

The output of this code indicates that the sensor is reporting driving on an extremely rough or extremely smooth road.

At P1308, P1309

The ECU stores a fault code and turns on the engine management system malfunction indicator lamp if the acceleration sensor shows acceleration of 0.3 g or more at zero vehicle speed in two driving cycles. The output of this code indicates that the acceleration sensor is sending a jolt signal from a road bump to the ECU at zero vehicle speed.