Knock Sensor: Testing and Inspection
KNOCK SENSOR (KS) INSPECTIONNOTE: 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 megaohms
Circuit Open/Short Inspection
1. Disconnect the PCM connector. (See PCM REMOVAL/INSTALLATION.)
2. Inspect the following wiring harnesses for open or short circuit. (Continuity check).
Open circuit
- If there is no continuity, there is an open circuit. Repair or replace the wiring 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, there is a short circuit. Repair or replace the wiring 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