Communication For Initializing Impossible: Wiring Diagram

CAN communication system Ref. to the SYSTEM WIRING diagram article.

Fig 1: CAN Communication System Wiring Diagram

G10299289

Courtesy of SUBARU OF AMERICA, INC.

DIAGNOSTIC PROCEDURE

Step	Check	Yes	No
1 CHECK SUBARU SELECT MONITOR. Connect the Subaru Select Monitor to another vehicle. Check communication condition between Subaru Select Monitor and vehicle.	Is communication performed normally?	Go to step 2.	Subaru Select Monitor unit or diagnosis cable is faulty. Or check the fuse on the vehicle side.
2 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?	For engine type EJ, Go to step 3. For engine type FA, Go to step 9.	Perform the inspection using the check sheet of communication for initializing. < Ref. to CHECK USING THE CHECK SHEET OF COMMUNICATION FOR INITIALIZING , COMMUNICATION FOR INITIALIZING IMPOSSIBLE, Subaru Select Monitor. >
3 CHECK K-LINE. Establish the communication between Select Monitor and K-Line communication module. 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?	Go to step 4.	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?	Repair or replace the short circuit.	Go to step 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?	Repair or replace the short circuit.	Go to step 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?	Go to step 8.	Go to step 7.
7 CHECK K-LINE. Disconnect the ECM connector. Use a tester to check for continuity in the ground circuit. Connector & terminal (B40) No. 4 - (B137) No. 3: (B40) No. 5 - (B136) No. 4:	Is there continuity?	Check ECM ground.	Repair or replace the open circuit.
8 CHECK K-LINE. Turn the ignition switch to ON. 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?	K-Line is normal. Check the power supply circuit of each module.	Check the power supply circuits to the data link connector.
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?	Go to step 10.	Repair or replace the open circuit.
10 CHECK DATA LINK CONNECTOR. Turn the ignition switch to ON. Using a tester, check the power supply of data link connector. Connector & terminal (B40) No. 8 (+) - Chassis ground (-): (B40) No. 16 (+) - Chassis ground (-):	Is there continuity?	Repair or replace the short circuit.	Check the power supply circuits to the data link connector.