Viper RT-10 V10-8.0L VIN E (1997)
Crankshaft Position Sensor: Description and Operation
Fig 6 Timing Slots On Crankshaft
CRANKSHAFT POSITION SENSOR
The crankshaft position sensor detects slots cut into a disk in the middle of the crankshaft (Fig. 6). There are a 5 sets of slots. Each set contains 2
slots, for a total of 10 slots. Basic timing is determined by the position of the last slot in each group. Once the Powertrain Control Module (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 up to one engine revolution to determine crankshaft position during cranking.
The Powertrain Control Module (PCM) energizes the individual ignition coils in each pack. The PCM can determine cylinder identification from
the crankshaft position sensor and camshaft position sensor inputs.
The PCM uses the camshaft reference sensor to determine injector sequence. Once crankshaft position has been determined, the PCM begins
energizing the injectors in sequence. The PCM determines ignition timing from the crankshaft timing sensor.
Fig 7 Crankshaft Position Sensor
The crankshaft position sensor is located in the passengers side of the engine block, below the exhaust manifold (Fig. 7).
CIRCUIT OPERATION
The crankshaft position sensor is located on the right side center of the engine block.
Circuit K7 supplies 5 volts from the Powertrain Control Module (PCM) to the crankshaft position sensor. The K7 circuit connects to cavity A17 of
the PCM.
Circuit K24 from the sensor provides an input signal to the PCM. The K24 circuit connects to cavity A8 of the PCM.
The PCM provides a ground for the crankshaft position sensor signal (circuit K24) through circuit K4. Circuit K4 connects to cavity A4 of the
PCM connector.
