W/Harness Inspection

P1550 Knock Sensor Evaluation IC

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 control circuit
1. IG KEY "OFF".
2. Disconnect Knock sensor connector.
3. IG KEY "ON" & ENG "OFF"
4. Measure the voltage between signal A terminal of Knock sensor harness connector and chassis ground.
5. Measure the voltage between signal B terminal of Knock sensor harness connector and chassis ground.

Specification : Approx 2.4 V




6. Is the measured voltage within specification?