Subaru Legacy BN/BS (2015-2019) Service Manual: Basic diagnostic procedure procedure

Subaru Legacy BN/BS (2015-2019) Service Manual / Power assisted system (power steering) (diagnostics) / Basic diagnostic procedure procedure

CAUTION:

• The power steering control module continues to operate after the engine stops and calculate the temperature in the control module. Therefore, before starting service of the power steering system which requires disconnection of the connector, stop the engine and allow approx. 30 minutes until the control module becomes cold.

• Before removal or installation, be sure to remove any foreign matter (dust, moisture, oil, etc.) from the power steering control module connector.

NOTE:

• Shake the connector at the suspected trouble location to check for open or short circuits of the harness.

• Refer to “Check List for Interview”. Check List for Interview

STEP	CHECK	YES	NO
1.CHECK PRE-INSPECTION. 1) Ask the customer when and how the trouble occurred using the interview check list. Check List for Interview 2) Check the illumination status of the STEERING warning light while the engine is running. 3) Before performing diagnostics, check components which might affect power steering problems. General Description > INSPECTION 4) Save the data of «Overheating protection intervention history», «IG Count after ECU Overheat Protection(latest)», «IG Count after ECU Overheat Protection(Previous)», «IG Count after ECU Overheat Protection(Before Previous)», and «Assist limit history (low voltage)» using Subaru Select Monitor. Subaru Select Monitor > OPERATION	Are components that might influence the power steering problem operating properly-	Basic Diagnostic Procedure > PROCEDURE	Repair or replace each component.
2.CHECK INDICATION OF DTC. 1) Turn the ignition switch to OFF. 2) Connect the Subaru Select Monitor to data link connector. 3) Turn the ignition switch to ON and run the Subaru Select Monitor. 4) Read the DTC using the Subaru Select Monitor. Read Diagnostic Trouble Code (DTC) > OPERATION NOTE: If the communication function of the Subaru Select Monitor cannot be executed properly, check the communication circuit. Subaru Select Monitor > INSPECTION	Are DTC, time stamp and freeze frame data displayed-	Record the DTC, time stamp and freeze frame data. Basic Diagnostic Procedure > PROCEDURE NOTE: • For the time stamp, refer to LAN section. General Description > CAUTION • Depending on DTCs, time stamp may not be stored.	Basic Diagnostic Procedure > PROCEDURE
3.PERFORM GENERAL DIAGNOSTICS. 1) If the STEERING warning light is illuminated while the engine is running, perform the Clear Memory Mode. Clear Memory Mode > OPERATION 2) Perform the Inspection Mode. Inspection Mode 3) Read the DTC. Read Diagnostic Trouble Code (DTC) > OPERATION Check that the DTC is not displayed.	Does the STEERING warning light illuminate at ignition switch ON, and turn off two seconds after the engine is started-	Finish the diagnosis.	Subaru Select Monitor > INSPECTION
4.PERFORM DIAGNOSIS. 1) Refer to “List of Diagnostic Trouble Code (DTC)”. List of Diagnostic Trouble Code (DTC) > LIST 2) Correct the cause of trouble. 3) Check the illumination status of the STEERING warning light while the engine is running, and if the warning light is lit, perform Clear Memory Mode. Clear Memory Mode > OPERATION 4) Perform the Inspection Mode. Inspection Mode 5) Read the DTC. Read Diagnostic Trouble Code (DTC) > OPERATION	Is DTC displayed-	Repeat step 4 until DTC is not shown.	Finish the diagnosis.

Power assisted system (power steering) (diagnostics)

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Check list for interview check

Check the following items regarding condition of the vehicle.1. TROUBLE STATUSPhenomenon of the vehicle Steering is heavy Steering is not smooth Steering is unstable (wondering) Steering does not retu ...

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