CAN Communication Circuit Check: Procedure: Wiring diagram

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

• Non-turbo model

Fig 1: CAN Communication System Wiring Diagram Non-Turbo Model (1 Of 2)

Courtesy of SUBARU OF AMERICA, INC.

Fig 2: CAN Communication System Wiring Diagram Non-Turbo Model (2 Of 2)

Courtesy of SUBARU OF AMERICA, INC.

Fig 3: CAN Communication System Wiring Diagram Turbo Model (1 Of 2)

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Fig 4: CAN Communication System Wiring Diagram Turbo Model (2 Of 2)

Courtesy of SUBARU OF AMERICA, INC.

1. CHECK BASIC DIAGNOSTIC PROCEDURE. 

   Check that the basic diagnosis has been performed up to step 8.

   NOTE: Possible defective parts can be narrowed easily by inspection using Subaru Select Monitor before performing "CHECK CAN COMMUNICATION CIRCUIT" using a tester.

   Was the basic diagnostic procedure performed?

   • Yes  : Go to 2. 
   • No  : Perform the basic diagnostic procedure. Ref. to LAN SYSTEM (DIAGNOSTICS)>Basic Diagnostic Procedure>PROCEDURE .
2. CHECK FROM DATA LINK CONNECTOR. 

   Using the tester, measure the resistance between terminals.

   Connector & terminal 

   (B40) No. 6 - Chassis ground:

   (B40) No. 14 - Chassis ground:

   Is the resistance 10 Ω or less?

   • Yes  : Check for ground short. Ref. to LAN SYSTEM (DIAGNOSTICS)>CAN Communication Circuit Check>INSPECTION>GROUND SHORT INSPECTION .
   • No  : Go to 3. 
3. CHECK FROM DATA LINK CONNECTOR. 
   1. Turn the ignition switch to ON.
   2. Using the tester, measure the voltage between terminals.

      Connector & terminal 

      (B40) No. 6 - Chassis ground:

      (B40) No. 14 - Chassis ground:

   Is the voltage 5 V or less?

   • Yes  : Go to 4. 
   • No  : Check for battery short. Ref. to LAN SYSTEM (DIAGNOSTICS)>CAN Communication Circuit Check>INSPECTION>BATTERY SHORT INSPECTION .
4. CHECK FROM DATA LINK CONNECTOR. 
   1. Turn the ignition switch to OFF.
   2. Using the tester, measure the resistance between terminals.

      Connector & terminal 

      (B40) No. 6 - No. 14:

   Is the resistance 52 Ω or less?

   • Yes  : Perform the inspection for resistance of 52 Ω or less. Ref. to LAN SYSTEM (DIAGNOSTICS)>CAN Communication Circuit Check>INSPECTION>52 Ω OR LESS .
   • No  : Go to 5. 
5. CHECK FROM DATA LINK CONNECTOR. 

   Using the tester, measure the resistance between terminals.

   Connector & terminal 

   (B40) No. 6 - No. 14:

   Is the resistance 62 Ω or more?

   • Yes  : Perform the inspection for resistance of 62 Ω or more. Ref. to LAN SYSTEM (DIAGNOSTICS)>CAN Communication Circuit Check>INSPECTION>62 Ω OR MORE .
   • No  : If the display of CAN system U-code disappears from the current malfunction, the CAN network is currently normal. If the U-code has detected as current malfunction, related lines may be open. Perform the inspection for the related line corresponding to the detected DTC. Ref. to LAN SYSTEM (DIAGNOSTICS)>CAN Communication Circuit Check>LIST .