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
Wiring diagram:

Engine Electrical System Ref. to WIRING SYSTEM>ENGINE ELECTRICAL SYSTEM .

Courtesy of SUBARU OF AMERICA, INC.

CAUTION: Use the check board when measuring the ECM terminal voltage and resistance. Ref. to ENGINE (DIAGNOSTICS) (H4DOTC)>General Description>PREPARATION TOOL>HOW TO USE CHECK BOARD .

NOTE: After the faulty parts are repaired or replaced, perform the final check in Basic Diagnostic Procedure. Ref. to ENGINE (DIAGNOSTICS) (H4DOTC)>Basic Diagnostic Procedure>PROCEDURE .

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. 22 - (E158) No. 42:
Is the resistance less than 500 kΩ?

Yes : Go to 2.

No : Go to 3.
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) (H4DOTC)>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.
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. 42 (+) - 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.