Knock Sensor: Testing and Inspection

KNOCK SENSOR (KS) INSPECTION

NOTE: Perform the following test only when directed.

Resistance Inspection

1. Turn the ignition switch to LOCK.
2. Disconnect the KS connector.
3. Measure the resistance between the KS terminals A and B using an ohmmeter.
- If not as specified, replace the KS.
- If the KS is okay, but PID value is out of specification, perform the "Circuit Open/Short Inspection".

Specification: Approx. 4.87 megohms

Circuit Open/Short Inspection

1. Disconnect the PCM connector.




2. Inspect the following wiring harnesses for open or short. (Continuity check)

Open circuit

- If there is no continuity, the circuit is open. Repair or replace the harness.
- KS terminal A (harness-side) and PCM terminal 2S (harness-side)
- KS terminal B (harness-side) and PCM terminal 2P (harness-side)

Short circuit

- If there is continuity, the circuit is shorted. Repair or replace the harness.
- KS terminal A (harness-side) and power supply
- KS terminal A (harness-side) and body GND
- KS terminal B (harness-side) and power supply
- KS terminal B (harness-side) and body GND