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

WARNING: This page is about a different variant/trim than selected.

DTC DETECTING CONDITION:

Immediately at fault recognition
GENERAL DESCRIPTION < Ref. to DTC P0328 KNOCK SENSOR 1 CIRCUIT HIGH INPUT (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, conduct Clear Memory Mode < Ref. to , OPERATION , Clear Memory Mode. > and Inspection Mode < Ref. to , PROCEDURE , Inspection Mode. >.

WIRING DIAGRAM:

Fig 1: DTC P0328 Knock Sensor 1 Circuit High Input - Wiring Diagram And Connector Terminal

Courtesy of SUBARU OF AMERICA, INC.

DIAGNOSTIC PROCEDURE DTC P0328

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 (B136) No. 25 - 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 terminal and engine ground. Terminals No. 2 - Engine ground:	Is the resistance less than 400 kΩ?	Replace the knock sensor. < Ref. to KNOCK SENSOR . >	Repair ground short circuit in harness between knock sensor connector and ECM connector. NOTE: The harness between both connectors is shielded. Repair short circuit of harness together with shield.
3 CHECK INPUT SIGNAL FOR 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 (B136) No. 25 (+) - Chassis ground (-):	Is the voltage more than 2 V?	Even if malfunction indicator light lights up, 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: Poor contact in knock sensor connector Poor contact in ECM connector Poor contact in coupling connector	Repair poor contact in ECM connector.