CAN Bus Line

DESCRIPTION

When any DTC for the CAN communication system is output, first measure the resistance between the terminals of the DLC3 to specify the trouble area. Then check that there is no short in the CAN main bus line, between the CAN bus lines, to B+, or to GND.

WIRING DIAGRAM

INSPECTION PROCEDURE

1. CHECK CAN BUS LINE (MAIN BUS LINE FOR OPEN, BUS LINES FOR SHORT CIRCUIT)

1. Turn the engine switch off.

2. Measure the resistance according to the value(s) in the table below.

   Standard resistance:

   Tester Connection	Condition	Specified Value
   J21-6 (CANH) - J21-14 (CANL)	Engine switch off	54 to 69 Ω

   Result:

   Result	Proceed to	See Procedure
   OK	A	-
   69 Ω or higher	B	Click here
   Below 54 Ω	C	Click here

B	OPEN IN CAN MAIN BUS LINE
C	SHORT IN CAN BUS LINES

A

2. CHECK CAN BUS LINE (SHORT TO B+ IN CAN BUS LINE)

1. Measure the resistance according to the value(s) in the table below.

   Standard resistance:

   Tester Connection	Condition	Specified Value
   J21-6 (CANH) - J21-16 (BAT)	Engine switch off	1 MΩ or higher
   J21-14 (CANL) - J21-16 (BAT)	Engine switch off	1 MΩ or higher

   See page:

   Result	See Procedure
   OK	Go to step 3
   NG	Click here

NG	SHORT TO B+ IN CAN BUS LINE

OK

3. CHECK CAN BUS LINE (SHORT TO GND IN CAN BUS LINE)

1. Measure the resistance according to the value(s) in the table below.

   Standard resistance:

   Tester Connection	Condition	Specified Value
   J21-4 (CG) - J21-6 (CANH)	Engine switch off	1 MΩ or higher
   J21-4 (CG) - J21-14 (CANL)	Engine switch off	1 MΩ or higher

   See page:

   Result	See Procedure
   OK	Click here
   NG	Click here

NG	SHORT TO GND IN CAN BUS LINE

OK
GO TO "HOW TO PROCEED WITH TROUBLESHOOTING"