Knock Sensor: Testing and Inspection

NOTE: Perform the following test only when directed.

Resistance Inspection

1. Turn the ignition switch to LOCK.
2. Disconnect the knock sensor connector.




3. Measure the resistance between the knock sensor terminals A and B.
- If not as specified, replace the knock sensor.
- If the knock sensor is okay, but PCM terminals 57 and 59 voltages are out of specification, perform the "Circuit Open/Short Inspection".

Specification: 532 - 588 kOhms (20 °C {68 °F})

Circuit Open/Short Inspection
1. Disconnect the PCM connector.




2. Connect the SST (104 Pin Breakout Box) with the PCM disconnected.
3. Tighten the connector attaching bolt.

Tightening torque
7.9 - 10.7 N.m {80 - 110 kgf.cm, 69.5 - 95.4 in.lbf}




4. Inspect the following wiring harness for open or short (Continuity check).

Open circuit
- If there is no continuity, the circuit is open.
Repair or replace the harness.
- Signal circuit (Knock sensor terminal A and PCM connector terminal 57)
- Signal circuit (Knock sensor terminal B and PCM connector terminal 59)

Short circuit
- If there is continuity, the circuit is shorted.
Repair or replace the harness.
- Signal circuit (Knock sensor terminal A and PCM connector terminal 57 to GND)
- Signal circuit (Knock sensor terminal B and PCM connector terminal 59 to GND)