Crankshaft Position Sensor: Description and Operation

TDC/CKP/CYL Sensor Operation:

PURPOSE
To determine ignition timing at start-up, position of #1 cylinder for sequential fuel injection, and normal timing for fuel injection and ignition of each cylinder and also detects engine RPM.

LOCATION
The TDC/CKP/CYP sensor is mounted inside the distributor. The unit is made up of three separate sensors

CONSTRUCTION
All three sensors are pickup coil and reluctor construction.

OPERATION
The ECM uses this signals to determine fuel injector and ignition timing and to calculate engine RPM.
The TDC sensor signal is used to determine ignition timing at engine start-up. This signal is also used as a backup signal in the event the CYP sensor signal becomes abnormal.
The CYP sensor generates a signal based on the position of the number #1 cylinder for proper timing of the sequential fuel injection system for all cylinders. The CKP sensor determines timing for fuel injection and ignition timing of each cylinder and detects engine speed.