Code 0304

NOTE: Freeze frame data is not stored in the ECM for the knock sensor. The MIL will not light for knock sensor malfunction.




The knock sensor is attached to the cylinder block. It senses engine knocking using a piezoelectric element. A knocking vibration from the cylinder block is sensed as vibrational pressure. This pressure is converted into a voltage signal and sent to the ECM.




DIAGNOSTIC CHART




DIAGNOSTIC TROUBLE CODE CONFIRMATION PROCEDURE
CONSULT
1) Turn ignition switch "ON" and select "DATA MONITOR" mode with CONSULT.
2) Start engine and run it for at least S seconds at idle speed.

OR

GST
1) Start engine and run it for at least S seconds at idle speed.
2) Select "MODE 3" with GST.

OR

NO TOOLS
1) Start engine and run it for at least 5 seconds at idle speed.
2) Turn ignition switch "OFF", wait for at least 5 seconds and then turn "ON".
3) Perform "Diagnostic Test Mode II (Self-diagnostic results)" with ECM.

COMPONENT INSPECTION
1. Disconnect knock sensor harness connector.




2. Check resistance between terminal 2 and ground.

Approximately 500 - 620 K Ohms [at 25°C (77°F)]

- It is necessary to use an ohmmeter which can measure more than 10 M Ohms.

CAUTION: Do not use any knock sensors that have been dropped or physically damaged. Use a new one.




WIRING DIAGRAM