Grand Prix V6-191 3.1L VIN M SFI (1998)
Knock Sensor: Description and Operation
Knock Sensor (KS)
DESCRIPTION
The knock sensor detects abnormal vibration (spark knocking) in the engine. The sensor is located on the engine block near the cylinders.
OPERATION
The sensor produces an AC output voltage which increases with the severity of the knock. This signal voltage is input to the PCM. The PCM then
adjusts the Ignition Control (IC) timing to reduce spark knock. DTCs P0325 and P0327 are designed to diagnose the KS module, the knock sensor,
and related wiring, so problems encountered with the KS system should set a DTC.
