LeSabre V6-231 3.8L VIN C SFI (1990)
Camshaft Position Sensor: Description and Operation
Camshaft Position Signal
Camshaft Sensor
PURPOSE
The ECM uses the camshaft signal to calculate true Sequential Fuel Injection (SFI) mode or operation.
OPERATION
As the camshaft sprocket turns, a permanent magnet activates the Hall-Effect switch in the cam shaft sensor. When the Hall-effect switch is
activated, it grounds the signal line to the ECM, pulling the camshaft signal line's applied voltage low. This is interpreted as a cam shaft signal.
The camshaft signal is created as piston #1 is approximately 25° After Top Dead Center (ATDC) on the power stroke.
LOCATION
The camshaft sensor is located on the timing cover behind the water pump near the camshaft sprocket.
DIAGNOSTIC NOTES:
When the cam shaft signal is not received by the ECM, a Code 41 will set.
