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

Fig 1: Knock Sensor - Wiring 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  (B137) No. 2 - (B134) No. 29:	Is the resistance less than 500 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 connectors. Terminals  No. 1 - No. 2:	Is the resistance less than 500 kΩ?	Replace the knock sensor. Ref. to KNOCK SENSOR .	Repair the ground short circuit of harness between ECM and knock sensor connector. NOTE: The harness between both connectors are shielded. Remove the shield and repair the short circuit of the harness.
3 CHECK INPUT SIGNAL OF ECM.  Connect the connector to ECM. Turn the ignition switch to ON. Measure the voltage between ECM and chassis ground. Connector & terminal  (B137) No. 2 (+) - Chassis ground (-):	Is the voltage 2 V or more?	Even if DTC is detected, the circuit has returned to a normal condition at this time. Reproduce the failure, and then perform the diagnosis again. NOTE: In this case, temporary poor contact of connector, temporary open or short circuit of harness may be the cause.	Repair the poor contact of ECM connector.