DTC P0327: Knock/Combustion Vibration Sensor 1 Circuit Low Bank 1 Or Single Sensor: Notes

DTC detecting condition: 

Immediately at fault recognition

Trouble symptom: 

• Poor driving performance
• Knocking occurs

• Use the check board when measuring the ECM terminal voltage and resistance.

Wiring diagram: 

Engine Electrical System Ref. 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 less than 500 kΩ?

   Yes: Go to  2.

   No: Go to  3.

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

      Terminals 

      No. 1 - No. 2:

   Is the resistance less than 500 kΩ?

   Yes: Replace the knock sensor. Ref. to FUEL INJECTION (FUEL SYSTEMS) (EXCEPT FOR STI)>Knock Sensor .

   No: Repair the short circuit to ground in harness between ECM connector and knock sensor connector.

   NOTE: The harness between both connectors are shielded. Remove the shield and repair the short circuit of harness.
3. CHECK INPUT SIGNAL OF ECM  .
   1. Connect the ECM.
   2. Turn the ignition switch to ON.
   3. Measure the voltage between ECM connector and engine ground.

      Connector & terminal 

      (E158) No. 14 (+) - Engine ground (-):

   Is the voltage 2 V or more?

   Yes: 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.

   No: Repair the short circuit to ground in harness between ECM connector and knock sensor connector.

   NOTE: The harness between both connectors are shielded. Remove the shield and repair the short circuit of harness.