Diagnostic Procedure for Subaru Select Monitor Communication: Inspection: Notes

Diagnosis:

Subaru Select Monitor communication line is open or shorted.

Trouble symptom:

Not communicable with Subaru Select Monitor.

Wiring diagram:

CAN communication system Ref. to WIRING SYSTEM>CAN Communication System>WIRING DIAGRAM .
Engine electrical system Ref. to WIRING SYSTEM>Engine Electrical System>WIRING DIAGRAM .

Courtesy of SUBARU OF AMERICA, INC.

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.
CHECK DATA LINK CONNECTOR .
Use a tester to check for continuity in the ground circuit.

Connector & terminal

(i288) No. 4 - Chassis ground:

(i288) No. 5 - (B134) No. 21:

Is there continuity?

Yes : Go to 3.

No : Repair or replace the open circuit.
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
  
  (i288) No. 8 (+) - Chassis ground (-):
  
  (i288) No. 16 (+) - Chassis ground (-):
  
  Is the voltage 10 V or more?
  
  Yes : Go to 4.
  
  No : Check the power supply circuits to the data link connector.
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)

NOTE: By performing [CAN bus connected ECU], confirmation of minimal connection modules is possible. Ref. to LAN SYSTEM (DIAGNOSTICS)>CAN BUS CHECK .

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. Ref. to LAN SYSTEM (DIAGNOSTICS)>Diagnostic Procedure for Subaru Select Monitor Communication>INSPECTION>CHECK USING THE CHECK SHEET OF COMMUNICATION FOR INITIALIZING .