Communication For Initializing Impossible: Wiring Diagram

Engine electrical system. < Ref. to the appropriate SYSTEM WIRING diagram article, Engine Electrical System. >

Fig 1: Engine Electrical System - Wiring Diagram

G10320264

Courtesy of SUBARU OF AMERICA, INC.

DIAGNOSTIC PROCEDURE

Step	Check	Yes	No
1 CHECK POWER SUPPLY CIRCUIT. Connect DST-i or general scan tool to data link connector.	Does DST-i or the general scan tool turn ON?	Go to step 4.	Go to step 2.
2 CHECK POWER SUPPLY CIRCUIT. Measure the voltage between data link connector and chassis ground. Connector & terminal (B40) No. 16 (+) - Chassis ground (-):	Is the voltage 10 V or more?	Go to step 3.	Repair the power supply circuit. NOTE: In this case, repair the following item: Open or ground short circuit of harness between battery and data link connector Blown out of fuse (M/B No. 13)
3 CHECK HARNESS BETWEEN DATA LINK CONNECTOR AND CHASSIS GROUND. Turn the ignition switch to OFF. Measure the resistance of harness between data link connector and chassis ground. Connector & terminal (B40) No. 4 - Chassis ground: (B40) No. 5 - Chassis ground:	Is the resistance less than 5 Ω?	Repair the poor contact of data link connector.	Repair the harness and connector. NOTE: In this case, repair the following item: Open circuit in harness between ECM connector and data link connector Open circuit of harness between ECM connector and engine ground Poor contact of ECM connector Poor contact of coupling connector
4 CHECK HARNESS BETWEEN ECM AND DATA LINK CONNECTOR. Measure the resistance between data link connector and chassis ground. Connector & terminal (B40) No. 7 - Chassis ground:	Is the resistance 1 MΩ or more?	Repair the poor contact of the ECM or data link connector.	Repair the short circuit to ground in harness between ECM connector and data link connector.