CAN Communication Circuit Check: Procedure: Wiring Diagram

Fig 1: Identifying CAN Communication Wiring Diagram

Courtesy of SUBARU OF AMERICA, INC.

Step	Check	Yes	No
1 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?	Check for ground short. Refer to , GROUND SHORT INSPECTION , INSPECTION, CAN Communication Circuit Check.	Go to step 2.
2 CHECK FROM DATA LINK CONNECTOR. Turn the ignition switch to ON. 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?	Go to step 3.	Check for battery short. Refer to , BATTERY SHORT INSPECTION , INSPECTION, CAN Communication Circuit Check.
3 CHECK FROM DATA LINK CONNECTOR. Turn the ignition switch to OFF. Using the tester, measure the resistance between terminals. Connector & terminal (B40) No. 6 - No. 14:	Is the resistance 55 Ω or less?	Perform the inspection for 55 Ω or less. Refer to , 55 Ω OR LESS , INSPECTION, CAN Communication Circuit Check.	Go to step 4.
4 CHECK FROM DATA LINK CONNECTOR. Using the tester, measure the resistance between terminals. Connector & terminal (B40) No. 6 - No. 14:	Is the resistance 65 Ω or more?	Perform the inspection for 65 Ω or more. Refer to , 65 Ω OR MORE , INSPECTION, CAN Communication Circuit Check.	A related line may be open. Perform the inspection for 56 - 64 Ω relevant to the detected DTC. Refer to , LIST , CAN Communication Circuit Check.