Calif

Rotary Vane Cup:

Figure 7 - Magnetic Flux Field:

PURPOSE
To provides information to the Powertrain Control Module (PCM) to identify the position of No. 1 cylinder,and to determine engine speed, load and spark timing requirements.

OPERATION
How the Profile Ignition Signal (PIP) Is Generated
- The Camshaft (CMP), "hall effect" sensor is a digital output device located within the distributor. A rotary vane cup is used to trigger the hall sensor. When the window of the cup is in the air gap between the hall device and the permanent magnet, a magnetic flux field is completed from the magnet through the hall device and back to the magnet.

- This condition results in a low (0 volts) output signal. As the distributor shaft turns, a tooth on the cup will move into the air gap. The magnetic field will be shunted by the tooth, preventing it from reaching the Hall device, and the output signal will change from a low to a high (B+).

Signature Pip Signal
- One tooth on the vane cup is smaller than the rest to identify when cylinder No.1 is at 10 degrees BTDC. The width of the PIP signal generated by this tooth is smaller than that of other teeth and is called signature PIP. It is required by the PCM so that it can accurately control the sequential firing of the fuel injectors.

CONSTRUCTION
The CMP sensor consists of a Hall effect device, a Permanent Magnet and a Rotary Vane Cup.