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Home >> Subaru >> 2013 >> Legacy Premium, Automatic CVT Trans >> Repair and Diagnosis >> External Pages >> Different car >> Section 37 (Engine Controls (Diagnostics) (H4DOTC)) >> Diagnostic Procedure with Diagnostic Trouble Code (DTC) >> DTC P0328 Knock Sensor 1 Circuit High (Bank 1 Or Single Sensor) >> Diagnostic Procedure

Diagnostic Procedure

WARNING: This page is about a different car, the 2013 Subaru Forester. However, it is still accessible from the selected car via links, so may be relevant.
DIAGNOSTIC PROCEDURE

Step Check Yes No
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 

    (B137) No. 2 - (B134) No. 29: 

 Is the resistance less than 500 kΩ? Go to step 2.  Go to step 3. 
2 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? Replace the knock sensor. < Refer to KNOCK SENSOR . > Repair the short circuit to ground in harness between ECM 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 and chassis ground.

    Connector & terminal 

    (B137) No. 2 (+) - Chassis ground (-): 

 Is the voltage 2 V or more? 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.
 Repair the poor contact of ECM connector.
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