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

WARNING: This page is about a different variant/trim than selected.

DTC detecting condition:

Immediately at fault recognition

Trouble symptom:

Poor driving performance
Knocking occurs

CAUTION:

After servicing or replacing faulty parts, perform Clear Memory Ref. to ENGINE (DIAGNOSTICS) (H4DO)>Clear Memory Mode . and Inspection Mode Ref. to ENGINE (DIAGNOSTICS) (H4DO)>Inspection Mode .
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 .

Fig 1: Knock/Combustion Vibration Sensor 1 Circuit Low Bank 1 Or Single Sensor - Wiring Diagram

Courtesy of SUBARU OF AMERICA, INC.

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

(B136) No. 28 - (B134) No. 29:

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 terminals.
Terminals

No. 1 -No. 2:

Is the resistance less than 500 kΩ?
- Yes: Replace the knock sensor. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DO)>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 connector to ECM.
2. Turn the ignition switch to ON.
3. Measure the voltage between ECM connector and chassis ground.
Connector & terminal

(B135) No. 30 (+) - Chassis 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.
  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.