R 3500 P/U 2WD V8-454 7.4L (1989)
Knock Sensor: Description and Operation
Figure 1 ESC Knock Sensor
The ESC knock sensor detects abnormal vibration (spark knocking) in the engine. The sensor is mounted in the engine block near the cylinders. The
ESC module receives the knock sensor information and sends a signal to the ECM. The ECM then adjusts the electronic spark timing (EST) to reduce
spark knocking. Refer to Figure 1.
