CAN Bus Line: Wiring Diagram

Fig 1: CAN Bus Line Wiring Diagram

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CHECK CAN BUS LINE (MAIN BUS LINE FOR DISCONNECTION, BUS LINES FOR SHORT CIRCUIT)

Disconnect the T39 translate ECU connector.

Fig 2: Identifying T39 Translate ECU Connector
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Measure the resistance of the DLC3.

Standard resistance

TESTER CONNECTION AND SPECIFIED CONDITION CHART

Tester Connection	Condition	Specified Condition	Proceed to
D8-6 (CANH) - D8-14 (CANL)	Ignition switch OFF	54 to 67 Ω	OK
D8-6 (CANH) - D8-14 (CANL)	Ignition switch OFF	67Ω or more	NG-A
D8-6 (CANH) - D8-14 (CANL)	Ignition switch OFF	54 Ω or less	NG-B

Fig 3: Identifying DLC3 Connector Terminals

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NG-A: CHECK CAN MAIN BUS LINE (FOR DISCONNECTION)

NG-B: CHECK CAN BUS LINE (FOR SHORT CIRCUIT)

OK: Go To Next Step

CHECK CAN BUS LINE (FOR SHORT TO B+)

Standard resistance

TESTER CONNECTION AND SPECIFIED CONDITION CHART

Tester Connection	Condition	Specified Condition
D8-6 (CANH) - D8-16 (BAT)	Ignition switch OFF	1 MΩ or higher
D8-14 (CANL) - D8-16 (BAT)	Ignition switch OFF	1 MΩ or higher

Fig 4: Checking CAN Bus Line (For Short To B+)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: CHECK CAN BUS LINE (FOR SHORT TO B+)

OK: Go To Next Step

CHECK CAN BUS LINE (FOR SHORT TO GND)

Standard resistance

TESTER CONNECTION AND SPECIFIED CONDITION CHART

Tester Connection	Condition	Specified Condition
D8-4 (CG) - D8-6 (CANH)	Ignition switch OFF	3 kΩ or higher
D8-4 (CG) - D8-14 (CANL)	Ignition switch OFF	3 kΩ or higher

Fig 5: Checking CAN Bus Line (For Short To GND)

NG: CHECK CAN BUS LINE (FOR SHORT TO GND)

OK: HOW TO PROCEED WITH TROUBLESHOOTING