Basic Diagnostic Procedure: 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.

CAUTION: Remove foreign matter (dust, water, oil etc.) from the TPMS & keyless entry control module connector when removing and installing.

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

Step	Check	Yes	No
1 CHECK PRE-INSPECTION. Check with the user regarding when the warning light lit or started blinking. Before performing diagnostics, check all components which may adversely affect the tire pressure monitor system. < Refer to INSPECTION , General Description. >	Is the component that might affect the tire pressure monitor system normal?	Go to step 2 .	Repair or replace each component.
2 CHECK DIAGNOSTIC TROUBLE CODE (DTC). Turn the ignition switch to OFF. Connect the Subaru Select Monitor to data link connector. Turn the ignition switch to ON and run the Subaru Select Monitor. NOTE: If the communication function of the Subaru Select Monitor cannot be executed normally, check the communication circuit. < Refer to INSPECTION , Subaru Select Monitor. > Read the DTC. < Refer to OPERATION , Read Diagnostic Trouble Code (DTC). >	Is DTC displayed?	Go to step 4 .	Go to step 3 .
3 PERFORM GENERAL DIAGNOSTICS. Perform the inspection by referring to "General Diagnostic Table". < Refer to GENERAL DIAGNOSTIC TABLE . > Perform the Clear Memory Mode. < Refer to CLEAR MEMORY MODE . > Perform the Inspection Mode. < Refer to INSPECTION MODE . > Read the DTC. < Refer to READ DIAGNOSTIC TROUBLE CODE (DTC) . >	Check 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 blinking patterns. < Refer to INSPECTION , Tire Pressure Warning Light / Trouble Indicator Light Illumination Pattern. >
4 CHECK FREEZE FRAME DATA. Using the Subaru Select Monitor, check the freeze frame data.	Are freeze frame data recorded?	Record the freeze frame data. Go to step 5 .	Go to step 5 .
5 PERFORM DIAGNOSIS. Refer to "List of Diagnostic Trouble Code (DTC)". Correct the cause of trouble. Perform the Clear Memory Mode. < Refer to CLEAR MEMORY MODE . > Perform the drive test. Drive the vehicle at 40 km/h (25 MPH) or faster for at least 10 minutes. Read the DTC. < Refer to READ DIAGNOSTIC TROUBLE CODE (DTC) . >	Is DTC displayed?	Repeat steps 1 to 4 until DTC is not shown.	Finish the diagnosis.