W/Harness Inspection

P0327 Knock Sensor 1 Circuit Low (Bank 1)

Inspection/Repair - W/Harness Inspection

Terminal & Connector Inspection

1. Many malfunctions in the electrical system are caused by poor harness and terminals.
Faults can also be caused by interference from other electrical systems, and mechanical or chemical damage.
2. Thoroughly check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration, or damage.
3. Has a problem been found?






Signal Circuit Inspection

Check Open or Short in signal circuit
1. IG KEY "OFF".
2. Disconnect Knock sensor connector.
3. IG KEY "ON" & ENG "OFF"
4. Measure the voltage between signal1 terminal of knock sensor harness connector and chassis ground.
5. Measure the voltage between signal2 terminal of knock sensor harness connector and chassis ground.

Specification : Approx 2.4 V




6. Is the measured voltage within specification?





Check resistance
1. IG KEY "OFF".
2. Disconnect Knock sensor connector and ECM connector.
3. Measure the resistance between signal1 terminal of knock sensor harness connector and knock signal1 terminal of the ECM harness connector.
4. Measure the resistance between signal2 terminal of knock sensor harness connector and knock signal2 terminal of the ECM harness connector.

Specification : Below 1 Ohms




5. Is the measured resistance within specifications?