Caravan FWD V6-3.8L VIN L (1999)
it determines crankshaft position (which piston will next be at TDC) from the camshaft position sensor input. The 4 pulses generated by the
crankshaft position sensor represent the 69°, 49°, 29°, and 9° BTDC marks. It may take the PCM one engine revolution to determine crankshaft
position.
The PCM uses crankshaft position reference to determine injector sequence, ignition timing and the presence of misfire. Once the PCM determines
crankshaft position, it begins energizing the injectors in sequence.
CRANKSHAFT POSITION SENSOR-PCM INPUT
The crankshaft position sensor 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. 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. 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 Multi-Port Fuel Injection Service Procedures.
