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) (H4DO)>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) (H4DO)>BASIC DIAGNOSTIC PROCEDURE>PROCEDURE .
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. 18 - (E158) No. 5:
  Is the resistance less than 500 K Ω?
  
  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 terminals.
    Terminals
    
    No. 1 - No. 2:
  Is the resistance less than 500 K Ω?
  
  Yes : Replace the knock sensor. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DO)>KNOCK SENSOR .
  
  No : Repair the short circuit between lines in the harness between the 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 connector to ECM.
  2. Turn the ignition switch to ON.
  3. Measure the voltage between ECM connector and engine ground.
    Connector & terminal
    
    (E158) No. 5 (+) - 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.