DTC 0304

DESCRIPTION







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.

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


DIAGNOSTIC TROUBLE CODE CONFIRMATION PROCEDURE

With Consult
(1) Turn ignition switch "ON" and select "DATA MONITOR" mode with CONSULT
(2) Start engine and run it for at least 5 seconds at idle speed.

OR

With GST
(1) Start engine and run it for at least 5 seconds at idle speed.
(2) Select "MODE 3" with GST

OR

Without Scan Tools
(1) Start engine and run it for at least 5 seconds at idle speed.
(2) Turn ignition switch "OFF", wait at least 5 seconds and then turn "ON".
(3) Perform "Diagnostic Test Mode II" (Self-diagnostic results) with ECM.

CIRCUIT DIAGRAM





DIAGNOSTIC PROCEDURE





COMPONENT INSPECTION




Knock sensor
- Use an ohmmeter which can measure more than 10 M Ohms.
1. Disconnect knock sensor harness connector.
2. Check resistance between terminal (1) and ground.

Resistance: 500 - 620 k Ohms [at 25°C (77°F)]

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