DG - Testing Notes

Knock Sensor Circuit:

DESCRIPTION
The knock sensor is used to detect engine detonation (spark knock). As a result, a voltage sent to the Powertrain Control Module (PCM) will retard spark timing.

REMEMBER
To prevent the replacement of good components, be aware that the following non-Electronic Engine Controls (EEC) areas may be at fault:

Fuel (quality)

Basic engine

Spark timing

This Pinpoint Test is intended to diagnose only the following:

Knock sensor

Harness circuits: KS and SIG RTN

PCM

NOTE: You should enter this Pinpoint Test only when you have been directed here from Diagnostic Routines.