Check CAN Bus Lines for Short Circuit (TO 12/2010): Procedure

WARNING: This page is about a different car, the 2011 Toyota Avalon. However, it is still accessible from the selected car via links, so may be relevant.

CHECK CAN BUS WIRE (DLC3 SUB BUS LINE)

Turn the ignition switch off.
Disconnect the connector from CAN junction connector.

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

Fig 1: Identifying DLC3 Connector Terminals

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Standard resistance

Tester Connection	Condition	Specified value
D20-6 (CANH) - D20-14 (CANL)	Ignition switch off	1 MΩ or more

NG → REPAIR OR REPLACE DLC3 SUB BUS LINE OR CONNECTOR

OK: Go to next step

CHECK CAN BUS WIRE (NETWORK GATEWAY ECU SUB BUS LINE)

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

Fig 2: Identifying CAN Bus Wire (Network Gateway ECU) Connector Terminals

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Standard resistance

Tester Connection	Condition	Specified value
6 (CANH) - 17 (CANL)	Ignition switch off	1 MΩ or more

NG → See step 8

OK: Go to next step

CHECK CAN BUS WIRE (ECM MAIN BUS LINE)

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

Fig 3: Identifying CAN Junction Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Standard resistance

Tester Connection	Condition	Specified value
10 (CANH) - 21 (CANL)	Ignition switch off	108 to 132 Ω

NG → See step 9

OK: Go to next step

CHECK CAN BUS WIRE (YAW RATE SENSOR SUB BUS LINE)

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

Fig 4: Identifying Yaw Rate Sensor Connector Terminals

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Standard resistance

Tester Connection	Condition	Specified value
2 (CANH) - 13 (CANL)	Ignition switch off	1 MΩ or more

NG → See step 10

OK: Go to next step

CHECK CAN BUS WIRE (STEERING ANGLE SENSOR SUB BUS LINE)

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

Fig 5: Identifying Steering Angle Sensor Connector Terminals (D12)

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Standard resistance

Tester Connection	Condition	Specified value
4 (CANH) - 15 (CANL)	Ignition switch off	1 MΩ or more

NG → See step 11

OK: Go to next step

CHECK CAN BUS WIRE (SKID CONTROL ECU MAIN BUS LINE)

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

Fig 6: Identifying CAN Bus Wire (Skid Control ECU Main Bus Line) Connector Terminals

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Standard resistance

Tester Connection	Condition	Specified value
9 (CANH) - 20 (CANL)	Ignition switch off	108 to 132 Ω

NG → See step 12

OK: Go to next step

CHECK CAN BUS WIRE (NAVIGATION ECU SUB BUS LINE)

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

Fig 7: Identifying Navigation ECU Connector Terminals

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Standard resistance

Tester Connection	Condition	Specified value
7 (CANH) - 18 (CANL)	Ignition switch off	1 MΩ or more

NG → See step 13

OK → REPLACE JUNCTION CONNECTOR (CAN J/C)

CHECK CAN BUS WIRE (NETWORK GATEWAY ECU)

Disconnect the network gateway ECU connector (E23).

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

Fig 8: Identifying CAN Bus Wire (Network Gateway ECU) Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Standard resistance

Tester Connection	Condition	Specified value
6 (CANH) - 17 (CANL)	Ignition switch off	1 MΩ or more

NG → REPAIR OR REPLACE NETWORK GATEWAY ECU SUB BUS LINE OR CONNECTOR

OK → REPLACE NETWORK GATEWAY ECU

CHECK CAN BUS WIRE (ECM)

Disconnect the ECM connector (A55).

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

Fig 9: Identifying CAN Junction Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Standard resistance

Tester Connection	Condition	Specified value
10 (CANH) - 21 (CANL)	Ignition switch off	1 MΩ or more

NG → REPAIR OR REPLACE ECM MAIN BUS LINE OR CONNECTOR

OK → See step 14

CHECK CAN BUS WIRE (YAW RATE SENSOR)

Disconnect the yaw rate sensor connector (D28).

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

Fig 10: Identifying Yaw Rate Sensor Connector Terminals

Standard resistance

Tester Connection	Condition	Specified value
2 (CANH) - 13 (CANL)	Ignition switch off	1 MΩ or more

NG → REPAIR OR REPLACE YAW RATE SENSOR SUB BUS LINE OR CONNECTOR

OK → See step 15

CHECK CAN BUS WIRE (STEERING ANGLE SENSOR)

Disconnect the steering angle sensor connector (D12).

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

Fig 11: Identifying Steering Angle Sensor Connector Terminals (D12)

Standard resistance

Tester Connection	Condition	Specified value
4 (CANH) - 15 (CANL)	Ignition switch off	1 MΩ or more

NG → REPAIR OR REPLACE STEERING ANGLE SENSOR SUB BUS LINE OR CONNECTOR

OK → See step 16

CHECK CAN BUS WIRE (SKID CONTROL ECU)

Disconnect the skid control ECU connector (A34).

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

Fig 12: Identifying CAN Bus Wire (Skid Control ECU Main Bus Line) Connector Terminals

Standard resistance

Tester Connection	Condition	Specified value
9 (CANH) - 20 (CANL)	Ignition switch off	1 MΩ or more

NG → REPAIR OR REPLACE SKID CONTROL ECU MAIN BUS LINE OR CONNECTOR

OK → See step 17

CHECK CAN BUS WIRE (NAVIGATION ECU)

Disconnect the navigation ECU connector.

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

Fig 13: Identifying Navigation ECU Connector Terminals

Standard resistance

Tester Connection	Condition	Specified value
7 (CANH) - 18 (CANL)	Ignition switch off	1 MΩ or more

NG → REPAIR OR REPLACE NAVIGATION ECU SUB BUS LINE OR CONNECTOR

OK → See step 18

REPLACE ECM. Refer to REMOVAL
REPLACE YAW RATE AND ACCELERATION SENSOR. Refer to REMOVAL
REPLACE STEERING ANGLE SENSOR. Refer to REMOVAL
REPLACE SKID CONTROL ECU. Refer to REMOVAL
REPLACE NAVIGATION ECU. Refer to REMOVAL