Reatta V6-231 3.8L VIN C SFI (1990)
Camshaft Position Sensor: Description and Operation
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.
