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

DTC DETECTING CONDITION:

Immediately at fault recognition
GENERAL DESCRIPTION < Ref. to DTC P0327 KNOCK SENSOR 1 CIRCUIT LOW INPUT (BANK 1 OR SINGLE SENSOR) , Diagnostic Trouble Code (DTC) Detecting Criteria. >

TROUBLE SYMPTOM:

Poor driving performance
Knocking occurs.

CAUTION: After repair or replacement of faulty parts, conduct Clear Memory Mode < Ref. to , OPERATION , Clear Memory Mode. > and Inspection Mode < Ref. to , PROCEDURE , Inspection Mode. >

WIRING DIAGRAM:

Fig 1: Wiring Diagram - Knock Sensor 1 Circuit (Low Input (Bank 1 Or Single Sensor))

Courtesy of SUBARU OF AMERICA, INC.

DTC P0327 DIAGNOSTIC PROCEDURE

Step	Check	Yes	No
1 : CHECK HARNESS BETWEEN KNOCK SENSOR AND ECM CONNECTOR. Turn the ignition switch to OFF. Disconnect the connector from ECM. Measure the resistance between ECM harness connector and chassis ground. Connector & terminal (B136) No. 25 - Chassis ground:	Is the resistance more than 700 kΩ?	Go to step 2.	Repair the 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 the connector from knock sensor. Measure the resistance between knock sensor connector terminal and engine ground. Terminals No. 2 - Engine ground:	Is the resistance more than 700 kΩ?	Go to step 3.	Repair the harness and connector. NOTE: In this case, repair the following: 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 the knock sensor. < Ref. to KNOCK SENSOR . >	Tighten the knock sensor installation bolt securely.