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.