Knock Sensor: Testing and Inspection

KNOCK SENSOR (KS) INSPECTION [LF]

NOTE: Before performing the following inspection, make sure to follow the procedure as indicated in the troubleshooting flowchart. (See HOW TO USE THIS MANUAL.)

Resistance Inspection
1. Remove the battery cover.
2. Remove the negative battery cable.
3. Disconnect the KS connector.
4. 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".

KS 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.
- KS terminal A and PCM terminal 2U
- KS terminal B and PCM terminal 2V

Short circuit
- If there is continuity, there is a short circuit. Repair or replace the wiring harness.
- KS terminal A and power supply
- KS terminal A and body ground
- KS terminal B and power supply
- KS terminal B and body ground