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 PID value or PCM terminal 57 and 66 voltage are out of specification, perform the "Circuit Open/Short Inspection".

Specification
Approx. 560 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
3.0 - 5.4 N.m {30 - 56 kgf-cm, 27 - 48 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.
- Knock sensor terminal A (harness-side) and 104 pin breakout box terminal 85
- Knock sensor terminal B (harness-side) and 104 pin breakout box terminal 86

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