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

Engine electrical system, 2.5 L model (without push button start). See appropriate SYSTEM WIRING DIAGRAM article.
Engine electrical system, 2.5 L model (with push button start). See appropriate SYSTEM WIRING DIAGRAM article.

Fig 1: Knock Sensor 1 - Circuit Diagram
Courtesy of SUBARU OF AMERICA, INC.

DIAGNOSTIC PROCEDURE

Step	Check	Yes	No
1 CHECK HARNESS BETWEEN ECM AND KNOCK SENSOR CONNECTOR. Turn the ignition switch to OFF. Disconnect the connector from ECM. Measure the resistance between ECM connectors. Connector & terminal (B136) No. 28 - (B134) No. 29:	Is the resistance 600 kΩ or more?	Go to step 2 .	Repair the poor contact of ECM connector.
2 CHECK KNOCK SENSOR. Disconnect the connector from the knock sensor. Measure the resistance between knock sensor terminals. Terminals No. 1 - No. 2:	Is the resistance 600 kΩ or more?	Replace the knock sensor. Refer to KNOCK SENSOR .	Repair the harness and connector. NOTE: In this case, repair the following item: Open circuit in harness between ECM and knock sensor connector Poor contact of knock sensor connector Poor contact of coupling connector