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:
- Detected simultaneously at occurrence of malfunction.
TROUBLE SYMPTOM:
- Poor driving performance
- Knocking occurs.

CAUTION: After repair or replacement of malfunctioning parts, conduct Clear Memory Mode < Ref. to OPERATION , CLEAR MEMORY MODE > and INSPECTION MODE < Ref. to OPERATION , INSPECTION MODE. >

WIRING DIAGRAM:

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

DIAGNOSTIC PROCEDURE

Step	Check	Yes	No
1 CHECK HARNESS BETWEEN KNOCK SENSOR AND ECM CONNECTOR. Measure resistance of harness between ECM connector and chassis ground. Connector & terminal (B135) No. 16 - Chassis ground:	Is the measured value less than 400 kΩ?	Go to step 2.	Go to step 3.
2 CHECK KNOCK SENSOR. Disconnect connector from knock sensor. Measure resistance between knock sensor connector terminal and engine ground. Terminal No. 2 - Engine ground:	Is the measured value less than 400 kΩ?	Replace 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 connectors to ECM and knock sensor. Turn ignition switch to ON. Measure voltage between ECM and chassis ground. Connector & terminal (B135) No. 16 (+) - Chassis ground (-):	Is the measured value more than 2 V?	Even if MIL 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.