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

Subaru Legacy BN/BS (2015-2019) Service Manual / Tire pressure monitoring system (diagnostics) / Basic diagnostic procedure procedure

CAUTION:

Remove foreign matter (dust, water, oil, etc.) from the TPMS & keyless entry CM connector or TPMS CM connector during removal and installation.

NOTE:

To check harness for open or short circuits, shake the suspected trouble spot or connector.

STEP	CHECK	YES	NO
1.CHECK PRE-INSPECTION. 1) Check with the user regarding when the warning light lit or started blinking. 2) Before performing diagnostics, check all components which may adversely affect the tire pressure monitor system. General Description > INSPECTION	Is the component that might affect the tire pressure monitor system normal-	Basic Diagnostic Procedure > PROCEDURE	Repair or replace each component.
2.CHECK DTC. Read the DTC of tire pressure monitoring. Read Diagnostic Trouble Code (DTC) NOTE: If the communication function of the Subaru Select Monitor cannot be executed normally, check the communication circuit. Subaru Select Monitor > INSPECTION	Is DTC displayed-	Basic Diagnostic Procedure > PROCEDURE	Basic Diagnostic Procedure > PROCEDURE
3.PERFORM GENERAL DIAGNOSTICS. 1) Perform the inspection by referring to “General Diagnostic Table”. General Diagnostic Table 2) Perform the Clear Memory Mode. Clear Memory Mode > OPERATION 3) Perform the Inspection Mode. Inspection Mode 4) Read the DTC of tire pressure monitoring. Read Diagnostic Trouble Code (DTC) > OPERATION Check that the DTC is not displayed.	Does the tire pressure warning light illuminates for about 2 seconds and then foes off after turning on the ignition switch, and then go out-	Finish the diagnosis.	Check the tire inflation pressure warning light. Tire Pressure Warning Light / Trouble Indicator Light Illumination Pattern
4.REPRODUCTION OF FAILURE. 1) Perform the drive test. Drive the vehicle at 40 km/h (25 MPH) or faster for at least 10 minutes. 2) Read the DTC of tire pressure monitoring. Read Diagnostic Trouble Code (DTC) > OPERATION	Is DTC displayed as “Present fault”-	Basic Diagnostic Procedure > PROCEDURE	When DTC is displayed as “Past faults”, the system has returned to a normal condition at this time. Reproduce the failure, and then perform the diagnosis again. NOTE: In this case, there may be temporary poor communication due to radio wave environment inside/outside the vehicle.
5.PERFORM DIAGNOSIS. 1) Refer to “List of Diagnostic Trouble Code (DTC)”. 2) Correct the cause of trouble. 3) Perform the Clear Memory Mode. Clear Memory Mode > OPERATION 4) Perform the drive test. Drive the vehicle at 40 km/h (25 MPH) or faster for at least 10 minutes. 5) Read the DTC of tire pressure monitoring. Read Diagnostic Trouble Code (DTC) > OPERATION	Is DTC displayed-	Repeat steps 1 to 4 until DTC is not shown.	Finish the diagnosis.

Tire pressure monitoring system (diagnostics)

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Clear memory mode operation

1. On «Start» display, select «Diagnosis».2. On «Vehicle selection» display, input the target vehicle information and select «Confirmed».3. On «Main Menu» display, select «Each System».4. ...

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