780 V6-2849cc 2.8L SOHC B280F (1987)
Cylinder Identification Sensor: Description and Operation
No. 1 Cylinder Sensor
Used by the ignition ECU:
PURPOSE AND LOCATION
The No. 1 cylinder sensor (15) has two purposes:
a)
Its signal is used by the ignition ECU to maintain the correct firing order at all times.
b)
Since the B280 engine is equipped with two knock sensors (one for each cylinder bank), the ignition ECU must be able to determine between the
two in order to calculate which cylinder is knocking. Then the ECU can retard the timing for the appropriate cylinder.
For this reason the No. 1 cylinder sensor (15) is fitted onto the No. 1 spark plug wire (18).
CONSTRUCTION
The sensor consists of a coil (16) wound around a core (17) surrounding the No. 1 ignition wire.
OPERATION
When the high voltage current travels through the No. 1 spark plug wire, a strong magnetic pulse momentarily surrounds the wire. This magnetic pulse
induces a current in the No. 1 cylinder sensor which is sent to the ignition ECU.
