Communication For Initializing Impossible: Notes

Diagnosis: 

Subaru Select Monitor communication line is open or shorted.

Trouble symptom: 

Not communicable with Subaru Select Monitor.

Wiring diagram: 

CAN communication system Refer to WIRING SYSTEM>CAN COMMUNICATION SYSTEM>WIRING DIAGRAM .

Courtesy of SUBARU OF AMERICA, INC.

1. CHECK SUBARU SELECT MONITOR. 
   1. Connect the Subaru Select Monitor to another vehicle.
   2. Check communication condition between Subaru Select Monitor and vehicle.

   Is communication performed normally?

   Yes:  Go to  2.

   No:  Subaru Select Monitor unit or diagnosis cable is faulty. Or check the fuse on the vehicle side.

2. CHECK VEHICLE CONDITION. 

   Check the target vehicle.

   Is the installed engine type EJ?

   Yes:  Go to  3.

   No:  For engine type FA. Go to  9.

3. CHECK K-LINE. 
   1. Establish the communication between Select Monitor and K-Line communication module.
   2. Using a tester, check continuity between the modules that did not communicate with Select Monitor.

      Connector & terminal 

      (B40) No. 7 - (B135) No. 14 (ECM):

   Is there continuity?

   Yes:  Go to  4.

   No:  Repair or replace the open circuit.

4. CHECK K-LINE. 

   Using a tester, check continuity between K-line and chassis ground.

   Connector & terminal 

   (B40) No. 7 - Chassis ground:

   Is there continuity?

   Yes:  Repair or replace the short circuit.

   No:  Go to  5.

5. CHECK K-LINE. 

   Using a tester, check voltage between K-line and chassis ground.

   Connector & terminal 

   (B40) No. 7 (+) - Chassis ground (-):

   Is the voltage 5 V or more with IG ON?

   Yes:  Repair or replace the short circuit.

   No:  Go to  6.

6. CHECK K-LINE. 

   Use a tester to check for continuity in the ground circuit.

   Connector & terminal 

   (B40) No. 4 - Chassis ground:

   (B40) No. 5 - Chassis ground:

   Is there continuity?

   Yes:  Go to  8.

   No:  Go to  7.

7. CHECK K-LINE. 
   1. Disconnect the ECM connector.
   2. Use a tester to check for continuity in the ground circuit.

      Connector & terminal 

      (B40) No. 4 - Chassis ground:

      (B40) No. 5 - Chassis ground:

   Is there continuity?

   Yes:  Check ECM ground.

   No:  Repair or replace the open circuit.

8. CHECK K-LINE. 
   1. Turn the ignition switch to ON.
   2. Using a tester, check the power supply of data link connector.

      Connector & terminal 

      (B40) No. 8 (+) - Chassis ground (-):

      (B40) No. 16 (+) - Chassis ground (-):

   Is the voltage 10 V or more?

   Yes:  K-Line is normal. Check the power supply circuit of each module.

   No:  Go to  11.

9. CHECK DATA LINK CONNECTOR. 

   Use a tester to check for continuity in the ground circuit.

   Connector & terminal 

   (B40) No. 4 - Chassis ground:

   (B40) No. 5 - Chassis ground:

   Is there continuity?

   Yes:  Go to  10.

   No:  Repair or replace the open circuit.

10. CHECK DATA LINK CONNECTOR. 
    1. Turn the ignition switch to ON.
    2. Using a tester, check the power supply of data link connector.

       Connector & terminal 

       (B40) No. 8 (+) - Chassis ground (-):

       (B40) No. 16 (+) - Chassis ground (-):

    Is the voltage 10 V or more?

    Yes:  Go to  11.

    No:  Check the power supply circuits to the data link connector.

11. CHECK COMMUNICATION FOR INITIALIZING ERROR. 

    Perform the communication for initializing with each module by connecting the Subaru Select Monitor. (For systems whose module can communicate with diagnostic devices)

    Is the communication possible with all modules?

    Yes:  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.

    No:  Perform the inspection using the check sheet of communication for initializing. Refer to LAN SYSTEM (DIAGNOSTICS)>SUBARU SELECT MONITOR>COMMUNICATION FOR INITIALIZING IMPOSSIBLE>CHECK USING THE CHECK SHEET OF COMMUNICATION FOR INITIALIZING .