DTC P0328: Knock/Combustion Vibration Sensor 1 Circuit High Bank 1 Or Single Sensor: Notes

DTC detecting condition: 

Immediately at fault recognition

Trouble symptom: 

• Poor driving performance
• Knocking occurs
  CAUTION:

  • After servicing or replacing faulty parts, perform Clear Memory Mode Refer to ENGINE (DIAGNOSTICS) (EXCEPT FOR STI)>CLEAR MEMORY MODE>OPERATION , and inspection mode Refer to ENGINE (DIAGNOSTICS) (EXCEPT FOR STI)>INSPECTION MODE>PROCEDURE ..
  • Use the check board when measuring the ECM terminal voltage and resistance.

Wiring diagram: 

Engine Electrical System Refer to WIRING SYSTEM>ENGINE ELECTRICAL SYSTEM>WIRING DIAGRAM .

Courtesy of SUBARU OF AMERICA, INC.

1. CHECK HARNESS BETWEEN ECM AND KNOCK SENSOR CONNECTOR. 
   1. Turn the ignition switch to OFF.
   2. Disconnect the connector from ECM.
   3. Measure the resistance between ECM connectors.

      Connector & terminal 

      (E158) No. 14 - (E159) No. 27:

   Is the resistance 600 kΩ or more?

   Yes:  Go to  2.

   No:  Repair the poor contact of ECM connector.

2. CHECK KNOCK SENSOR. 
   1. Disconnect the connector from the knock sensor.
   2. Measure the resistance between knock sensor terminals.

      Terminals 

      No. 1 - No. 2:

   Is the resistance 600 kΩ or more?

   Yes:  Replace the knock sensor. Refer to FUEL INJECTION (FUEL SYSTEMS) (EXCEPT FOR STI)>KNOCK SENSOR .

   No:  Repair the open circuit in harness between ECM connector and knock sensor connector.