Knock Sensor 1 - G61-, Checking: General Description

The Knock Sensor 1 -G61- is a tuned accelerometer on the engine which converts engine vibration to an electrical signal. The Engine/Motor Control Module -J623- uses this signal to determine the presence of engine knock and to retard spark timing, if necessary.

Special tools and workshop equipment required 

• Multimeter.
• Wiring Diagram.
• Scan Tool.