Beretta V6-3100 3.1L VIN M SFI (1995)
Camshaft Position Sensor: Description and Operation
Camshaft Position Sensor (CPS)
PURPOSE
The Camshaft Position sensor is a "Hall-effect" switch, located on the front top of the engine is supplied ignition voltage and has its own ground.
The sensor sends a signal to the Powertrain Control Module (PCM) prior to when the #1 cylinder is on the intake stroke.
DIAGNOSIS
This signal is used by the PCM to synchronize Sequential Fuel Injection (SFI) mode of operation with each intake valve opening. If the cam signal
is not received by the PCM, the PCM will still operate in SFI mode based on the reference signal, however, SFI mode timing may not be as
accurate because the PCM does not know the exact time the intake valve is opening. A loss of this signal or extra cam signals, above 500 RPM, to
the PCM will set a Diagnostic Trouble Code (DTC) 17.
The Tech 1 scan tool will display Camshaft Position Sensor data as a 0 and I. As the sensor pulses, the scan data will switch from 0 to 1. All
camshaft position sensor data should he checked at idle. An error in the camshaft position sensor circuit should set a DTC 17.
