Crankshaft Position Sensor: Description and Operation

TDC/CRANK/CYL SENSOR:

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/CRANK/CYL sensor is mounted at the front of the cylinder head. The TDC/CRANK SENSOR is located behind the cam sprocket, CYL SENSOR is mounted in front of the cam sprocket. The unit is made up of three separate sensors.

CONSTRUCTION
All three sensors are pickup coil and reluctor construction.

OPERATION
The ECU uses this signal to determine fuel injector and ignition timing and to calculate engine RPM.
The TDC portion of the sensor signals the ECU. This signal is used to determine ignition timing at engine start-up. It's signal is also used as a backup signal in the event the CRANK sensor signal becomes abnormal.
The CYL portion of the sensor reports to the ECU. This sensor generates a signal based on the position of the number #1 cylinder for proper timing of the sequential fuel injection system.
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