Disconnect the KS and PCM/ECM connectors and inspect for looseness, poor connection, bending, corrosion, contamination, deterioration or damage. Reconnect the connectors

Connect the GDS and go to “Current Data”.

Monitor KS values in Current Data, check and wiggle the harness(es), connector(s), and terminal(s).

Any change in the values indicates a poor connection. Was a connector problem found?

	▶ Repair the connector. Go to "Verification of Vehicle Repair" procedure.
	▶ Go to "Signal Circuit Inspection" procedure.

IG "OFF". Disconnect injector connector.

IG "ON".

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

Is the measured voltage within specification ?

	▶ Go to next step as below.
	▶ Repair as necessary and go to "Verification of Vehicle Repair" procedure.

IG "OFF". Disconnect knock sensor connector and PCM/ECM connector.

Measure resistance between signal terminal of the sensor harness connector and chassis ground.

Is the measured resistance within specification ?

	▶ Go to next step as below.
	▶ Repair as necessary and go to "Verification of Vehicle Repair" procedure.

IG "OFF". Disconnect knock sensor connector and PCM/ECM connector.

Measure resistance between signal terminal of sensor harness connector and Knock signal terminal of the PCM/ECM harness connector.

Is the measured resistance within specification ?

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

IG "OFF". Disconnect knock sensor connector.

Measure resistance of the ground circuit between the sensor connector and the PCM/ECM connector.

Is the measured resistance within specification ?

	▶ Go to next step as below.
	▶ Repair as necessary and go to "Verification of Vehicle Repair" procedure.