1) Disconnect the connector from knock sensor.
2) Measure the resistance between knock sensor terminals.
Terminals
No. 1 — No. 2:
Is the resistance 600 kΩ or more?
Replace the knock sensor.
Repair the harness and connector.
NOTE:
In this case, repair the following item:
• Open circuit of harness between ECM and knock sensor
• Poor contact of knock sensor connector
• Poor contact of coupling connector