W/Harness Inspection

Engine Control
P032C Knock Sensor 3 Circuit Low (Bank 1) - W/Harness Inspection

Terminal and 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 voltage
1. IG "OFF" and disconnect knock sensor connector.
2. IG "ON".
3. Measure voltage between low signal terminal of knock sensor harness connector and chassis ground.
4. Measure voltage between high signal terminal of knock sensor harness connector and chassis ground.

Specification : Approx. 1.6 V




5. Is the measured voltage within specification?





Check Open or Short in signal circuit
1. IG "OFF" and disconnect knock sensor connector and ECM connector.
2. Measure the resistance between low signal terminal of knock sensor harness connector and knock low signal terminal of the ECM harness connector.
3. Measure the resistance between high signal terminal of knock sensor harness connector and knock high signal terminal of the ECM harness connector.

Specification : Below 1 Ohms




4. Is the measured resistance within specifications?