Knock Sensor: Testing and Inspection
KNOCK SENSOR (KS) INSPECTIONNOTE: Perform the following inspection only when directed.
Resistance Inspection
1. Disconnect the negative battery cable.
2. Disconnect the KS connector.
3. Measure the resistance between KS terminals A and B using an ohmmeter.
- If the KS is okay, but the PID value is out of specification, perform the "Circuit Open/Short Inspection".
- If not as specified, replace the KS.
Specification
Approx. 4.87 megohms (20 °C {68 °F})
Circuit Open/Short Inspection
1. Disconnect the PCM connector.
2. Inspect the following harness for open or short circuit. (Continuity check)
Open circuit
- KS terminal B and PCM terminal 81
- KS terminal A and PCM terminal 3
Short circuit
- KS terminal A and power supply
- KS terminal A and body GND
- KS terminal B and power supply
- KS terminal B and body GND