Many malfunctions in the electrical system are caused by poor harness and terminal connections.

Faults can also be caused by interference from other electrical systems, and mechanical or chemical damage.

Thoroughly check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration, or damage.

Has a problem been found?

	▶ Repair as necessary and go to "Verification of Vehicle Repair" procedure
	▶ Go to " Signal Circuit Inspection " procedure.

IG "OFF" and disconnect knock sensor connector.

IG "ON".

Measure voltage between low signal terminal of knock sensor harness connector and chassis ground.

Measure voltage between high signal terminal of knock sensor harness connector and chassis ground.

Is the measured voltage within specification ?

	▶ Go to "Component inspection" procedure.
	▶ Repair Short to power in signal circuit and then, go to "Verification of Vehicle Repair" procedure.