Crankshaft Position Sensor

Fig 8 Crankshaft Position Sensor:

Fig 9 Timing Slots:

Fig 10 Crankshaft Position Sensor:

The crankshaft position sensor (Fig. 8) senses slots cut into the transaxle driveplate extension. There are 3 sets of slots. Each set contains 4 slots, for a total of 12 slots (Fig. 9). Basic timing is set by the position of the last slot in each group. Once the PCM senses the last slot, it determines crankshaft position (which piston will next be at TDC) from the camshaft position sensor input. It may take the PCM one engine revolution to determine crankshaft position.

The PCM uses the crankshaft position sensor signal to determine injector sequence, ignition timing and presence of misfire. Once crankshaft position has been determined, the PCM begins energizing the injectors in sequence.

The crankshaft position sensor is located in the transaxle housing, above the vehicle speed sensor (Fig. 10). The bottom of the sensor is positioned next to the drive plate. The distance between the bottom of sensor and the drive plate is critical to the operation of the system. When servicing the crankshaft position sensor, refer to the appropriate service procedures.