DTC P0328 Knock Sensor 1 Circuit High (Bank 1 Or Single Sensor)

WARNING: This page is about a different car, the 2006 Subaru Outback. However, it is still accessible from the selected car via links, so may be relevant.

DTC DETECTING CONDITION:

Immediately at fault recognition
GENERAL DESCRIPTION < Ref. to DTC P0328 KNOCK SENSOR 1 CIRCUIT HIGH (BANK 1 OR SINGLE SENSOR) , Diagnostic Trouble Code (DTC) Detecting Criteria. >

TROUBLE SYMPTOM:

Poor driving performance
Knocking occurs.

CAUTION: After repair or replacement of faulty parts, perform Clear Memory Mode < Ref. to OPERATION , Clear Memory Mode. > and Inspection Mode < Ref. to PROCEDURE , Inspection Mode. >.

WIRING DIAGRAM:

Fig 1: Knock Sensor - Wiring Diagram

DTC P0328 KNOCK SENSOR 1 CIRCUIT HIGH (BANK 1 OR SINGLE SENSOR) - DIAGNOSTIC PROCEDURE

Step	Check	Yes	No
1 CHECK HARNESS BETWEEN KNOCK SENSOR AND ECM CONNECTOR. Measure the resistance of harness between ECM connector and chassis ground. Connector & terminal (B134) No. 15 - Chassis ground:	Is the resistance less than 400 kΩ?	Go to step 2.	Go to step 3.
2 CHECK KNOCK SENSOR. Disconnect the connector from knock sensor. Measure the resistance between knock sensor connector terminals. Terminals No. 1 - No. 2:	Is the resistance less than 400 kΩ?	Replace the knock sensor. < Ref. to KNOCK SENSOR . >	Repair the ground short circuit of harness between knock sensor connector and ECM connector. NOTE: The harness between both connectors are shielded. Repair the short circuit of harness covered with shield.
3 CHECK INPUT SIGNAL OF ECM. Connect the connectors to ECM and knock sensor. Turn the ignition switch to ON. Measure the voltage between ECM and chassis ground. Connector & terminal (B134) No. 15 (+) - Chassis ground (-):	Is the voltage more than 2 V?	Even if the malfunction indicator light illuminates, the circuit has returned to a normal condition at this time. (However, the possibility of poor contact still remains.) NOTE: In this case, repair the following item: Poor contact in knock sensor connector Poor contact in ECM connector Poor contact in coupling connector	Repair the poor contact of ECM connector.