Toyota Tundra. Manual — part 309

Fig. 158: Identifying Open In One Side Of CAN Branch Line - Wiring Diagram (1 Of 2)
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

2009 Toyota Tundra

2009 ACCESSORIES & EQUIPMENT CAN Communication - Tundra

Fig. 159: Identifying Open In One Side Of CAN Branch Line - Wiring Diagram (2 Of 2)
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

INSPECTION PROCEDURE

HINT:



Perform the following inspection for the ECUs (sensors) which are not displayed on the Techstream. If a
malfunction cannot be identified, perform the following inspections for the ECUs (sensors) connected to
the CAN communication system.



Do not remove the combination meter and ECM, as they are the end parts of the circuit. If removed, CAN
communication will not be possible.



The open circuit confirmation of the combination meter, ECM and main wire is performed in the CHECK
CAN BUS LINE procedure of "HOW TO PROCEED WITH TROUBLESHOOTING". This inspection
only has procedures for checking for an open circuit on one side of the CAN branch wire.

1. DISCONNECT CABLE FROM NEGATIVE BATTERY TERMINAL

2009 Toyota Tundra

2009 ACCESSORIES & EQUIPMENT CAN Communication - Tundra

a. Disconnect the cable from the negative (-) battery terminal before measuring the resistances of the

main wire and the branch wire.

2. CHECK FOR OPEN IN ONE SIDE OF CAN BRANCH WIRE (MAIN BODY ECU)

a. Disconnect the J2 main body ECU connector.

b. Reconnect the cable to the negative (-) battery terminal.

c. Select "CAN Bus Check" on the Techstream.

Result

RESULT REFERENCE TABLE

B: Go to step 4

A: Go to next step

3. CHECK FOR OPEN IN ONE SIDE OF CAN BRANCH WIRE (MAIN BODY ECU BRANCH

WIRE)

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

Standard resistance

STANDARD RESISTANCE SPECIFICATION TABLE

CAUTION: Wait at least 90 seconds after disconnecting the cable from the

negative (-) battery terminal to prevent airbag and seat belt
pretensioner activation.

NOTE:

After the ignition switch is turned OFF, the navigation system
requires approximately 90 seconds to record various types of
memory and settings. As a result, after turning the ignition switch
OFF, wait 90 seconds or more before disconnecting the cable from
the negative (-) battery terminal.

Result

Proceed to

Main Body not displayed on Techstream.

A

Several ECUs and sensors other than Main Body not displayed on Techstream.

B

Tester Connection

Switch Condition Specified Condition

J2-5 (CANH) - J2-6 (CANL) Ignition switch OFF

54 to 69 ohms

2009 Toyota Tundra

2009 ACCESSORIES & EQUIPMENT CAN Communication - Tundra

Fig. 160: Identifying J2 Main Body ECU Connector
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

NG: REPAIR OR REPLACE CAN BRANCH WIRE OR CONNECTOR (MAIN BODY ECU)

OK: REPLACE MAIN BODY ECU

4. CHECK FOR OPEN IN ONE SIDE OF CAN BRANCH WIRE (SKID CONTROL ECU WITH

ACTUATOR)

a. Disconnect the A17 skid control ECU with actuator connector.

b. Reconnect the cable to the negative (-) battery terminal.

c. Select "CAN Bus Check" on the Techstream.

Result

RESULT REFERENCE TABLE

B: Go to step 6

A: Go to next step

5. CHECK FOR OPEN IN ONE SIDE OF CAN BRANCH WIRE (SKID CONTROL ECU WITH

ACTUATOR BRANCH WIRE)

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

Standard resistance

STANDARD RESISTANCE SPECIFICATION TABLE

Result

Proceed to

ABS/VSC/TRAC not displayed on Techstream.

A

Several ECUs and sensors other than ABS/VSC/TRAC not displayed on Techstream.

B

2009 Toyota Tundra

2009 ACCESSORIES & EQUIPMENT CAN Communication - Tundra