DTC P0328 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 :

Detect as soon as malfunction occurs.
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 , CLEAR MEMORY MODE , Clear Memory Mode.> and Inspection Mode < Ref. to , INSPECTION MODE , Inspection Mode.>.

WIRING DIAGRAM :

Fig 1: Identifying Knock Sensor 1 Circuit High Input Wiring Diagram (DTC P0328)

Courtesy of SUBARU OF AMERICA, INC.

DIAGNOSIS PROCEDURE - DTC P0328 KNOCK SENSOR 1 CIRCUIT

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 k?	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 k?	Replace the knock sensor. < Ref. to KNOCK SENSOR . >	Repair the ground short circuit in harness between knock sensor connector and ECM connector. NOTE: The harness between both connectors are shielded. Repair the short circuit in harness covered with shield.
3 CHECK INPUT SIGNAL FROM 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 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: Poor contact in knock sensor connector Poor contact in ECM connector Poor contact in coupling connector	Repair the poor contact in ECM connector.