Subaru Crosstrek Service Manual: Basic diagnostic procedure Procedure

CAUTION:

• Subaru Select Monitor is required for reading DTC, performing diagnosis, reading current data, customizing and active test (compulsory drive).

• Remove foreign matter (dust, water, oil, etc.) from each control module connector during removal and installation.

• Registration of immobilizer may be needed after the replacement of controller modules, etc. For detailed procedure, refer to the “REGISTRATION MANUAL FOR IMMOBILIZER” provided as a separate volume.

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

• Perform the diagnosis, and when the control module is replaced as a result of judgment that malfunction is the control module, re-check that the control module was actually malfunctioning. Replace to a new control module, and confirm that the malfunction is eliminated. Then, install the previously removed control module again and check that the malfunction reproduces again.

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1.CHECK PRE-INSPECTION.

Ask the customer when and how the trouble occurred using the interview check list. Check List for Interview">

Did you interview the customer?

Basic Diagnostic Procedure > PROCEDURE">Go to Step 2.

Interview the customer.

2.BASIC INSPECTION (CAN DIAGNOSTIC IS NOT USED).

Check the power supply circuit of the module which might affect CAN communication problem. General Description > INSPECTION">

Is the power supply circuit of each module that is performing CAN communication normal?

Basic Diagnostic Procedure > PROCEDURE">Go to Step 3.

Repair or replace the faulty portion.

3.BASIC INSPECTION (CAN DIAGNOSTIC IS NOT USED).

Check the registration status of the body integrated unit which might affect CAN communication problem. General Description > INSPECTION">

Does the registration status of the body integrated unit match the vehicle specification? (When the Subaru Select Monitor and the body integrated unit cannot communicate, and the registration status cannot be checked, Basic Diagnostic Procedure > PROCEDURE">Go to Step 5.)

Basic Diagnostic Procedure > PROCEDURE">Go to Step 4.

Match the registration status of the body integrated unit with the vehicle specification.

4.CHECK COMMUNICATION FOR INITIALIZING.

Communicate with the all systems by connecting the Subaru Select Monitor.

Is the communication for initializing finished for all modules?

Basic Diagnostic Procedure > PROCEDURE">Go to Step 5.

Check the error of communication for initializing. Subaru Select Monitor > COMMUNICATION FOR INITIALIZING IMPOSSIBLE">

5.CHECK DTC.

1) Start the engine and read all DTCs.

NOTE:

When the engine does not start, perform the diagnosis for the engine start malfunction. Diagnostics for Engine Starting Failure">

2) Record all DTCs (current malfunction and past malfunction), time stamp and freeze frame data.

NOTE:

For time stamp, refer to “TIME STAMP” of General Description. General Description > CAUTION">

Is DTC U**** displayed on Subaru Select Monitor?

Basic Diagnostic Procedure > PROCEDURE">Go to Step 6.

Inspect using the “General Diagnostic Table”. General Diagnostic Table">

6.CHECK USING THE DTC CHECK SHEET.

Perform the inspection using the DTC check sheet. List of Diagnostic Trouble Code (DTC) > LIST">

Is CAN communication line faulty?

Repair or replace the faulty portion of the harness. And then, Basic Diagnostic Procedure > PROCEDURE">Go to Step 7.

Perform the diagnosis for the displayed DTCs. And then, Basic Diagnostic Procedure > PROCEDURE">Go to Step 7.

7.PERFORM DIAGNOSIS.

1) Perform the Clear Memory Mode. Clear Memory Mode > OPERATION">

2) Read the DTC. Read Diagnostic Trouble Code (DTC) > OPERATION">

Are any DTCs displayed?

Repeat the Basic Diagnostic Procedure from the beginning until DTC is not shown.

Finish the diagnosis.

Communication for initializing impossible

Check list for interview Check

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