DTC P0327 - Knock Sensor 1 Circuit Low Input (Bank 1 Or Single Sensor) -

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

DTC DETECTING CONDITION:
- Detected simultaneously at occurrence of malfunction.
TROUBLE SYMPTOM:
- Poor driving performance
- Knocking occurs.

CAUTION: After repair or replacement of malfunctioning parts, conduct Clear Memory Mode < Ref. to OPERATION , CLEAR MEMORY MODE > and INSPECTION MODE < Ref. to OPERATION , INSPECTION MODE. >

WIRING DIAGRAM:

Fig 1: Knock Sensor Wiring Diagram
Courtesy of SUBARU OF AMERICA, INC.

DIAGNOSTIC PROCEDURE

Step	Check	Yes	No
1 CHECK HARNESS BETWEEN KNOCK SENSOR AND ECM CONNECTOR. Turn ignition switch to OFF. Disconnect connector from ECM. Measure resistance between ECM harness connector and chassis ground. Connector & terminal (B135) No. 16 - Chassis ground:	Is the measured value more than 700 kΩ?	Go to step 2.	Repair harness and connector. NOTE: In this case, repair the following: Open circuit in harness between knock sensor and ECM connector Poor contact in knock sensor connector Poor contact in coupling connector
2 CHECK KNOCK SENSOR. Disconnect connector from knock sensor. Measure resistance between knock sensor connector terminal and engine ground. Terminal No. 2 - Engine ground:	Is the measured value more than 700 kΩ?	Go to step 3.	Repair harness and connector. NOTE: In this case, repair the following: Open circuit in harness between knock sensor and ECM connector Poor contact in knock sensor connector Poor contact in coupling connector
3 CHECK CONDITION OF KNOCK SENSOR INSTALLATION.	Is the knock sensor installation bolt tightened securely?	Replace knock sensor. < Ref. to KNOCK SENSOR . >	Tighten knock sensor installation bolt securely.