Knock Sensor: Testing and Inspection

KNOCK SENSOR (KS) INSPECTION [L3]

Resistance Inspection

1. Disconnect the knock sensor connector.

2. Measure resistance between KS terminals A and B.

- If not within the specification, replace the KS.
- If the monitor item status/specification (reference) is not within the specification, even though the KS resistance is within the specification, perform the "Circuit Open/Short Inspection".

Resistance
- Approx. 4.87 megohms

Circuit Open/Short Inspection





1. Disconnect the PCM connector.

2. Inspect the following wiring harnesses for an open or short circuit. (Continuity inspection)

Open circuit

- If there is no continuity, there is an open circuit. Repair or replace the wiring harness.

- Knock sensor terminal A and PCM terminal 2U
- Knock sensor terminal B and PCM terminal 2V

Short circuit

- If there is continuity, there is a short circuit. Repair or replace the wiring harness.

- Knock sensor terminal A and power supply
- Knock sensor terminal A and body ground
- Knock sensor terminal B and power supply
- Knock sensor terminal B and body ground