The Electronic Spark Control, also called the Knock Sensor, is an electronic device built to help regulate the timing inside of the engine.

When engines are equipped with Electronic Spark Control (ESC) in conjunction with Electronic Spark Timing (EST), ESC is used to reduce spark advance under conditions of detonation. A knock sensor signals a separate ESC controller to retard the timing when it senses engine knock. The ESC controller signals the ECM/PCM which reduces spark advance until no more signals are received from the knock sensor.

Incorrect spark timing can have a significant effect on emission output and vehicle drivability. If ignition timing is excessively advanced during certain conditions, detonation will occur resulting in increased HC and NOx levels.

The following schematic shows typical Electronic Spark Control Knock Sensor Circuit Diagram.

Electronic Spark Control Knock Sensor Circuit Diagram

Related Post

Yamaha BT1100 Electrical System and Wiring Diagram
Dodge Grand Caravan Wiring Diagram Connectors Pinouts
1998 Rover 200 Heater Blower Wiring Diagram
Suzuki Grand Vitara Heater Circuit
VW Touareg 16 Electronic Diesel Control Wiring Diagram