Toyota Tundra. Manual — part 266

l. Multiplex tilt and telescopic ECU*3

5. DIAGNOSTIC CODES FOR CAN COMMUNICATION SYSTEM

a. DTCs for the CAN communication system are as follows: U0073, U0100, U0101, U0114, U0123,

U0124, U0126, U0129, U0199, U0208, U1002, U1115, B1499, and B2621

6. NOTES REGARDING TROUBLESHOOTING

a. Trouble in the CAN bus (communication line) can be checked through the DLC3 (except when

there is a wire break other than in the branch wire of the DLC3).

b. DTCs regarding the CAN communication system can be checked using the intelligent tester.

c. The CAN communication system cannot detect trouble in the branch line of the DLC3 even though

the DLC3 is also connected to the CAN communication system.

7. HOW TO DISTINGUISH CAN J/C CONNECTOR

a. In the CAN communication system, the shape of all connectors connected to the CAN J/C is the

same. The connectors connected to the CAN J/C can be distinguished by the colors of the bus line
and the connecting side of the connector.

HINT:

See TERMINALS OF ECU for bus line color or the type of connecting surface.

HOW TO PROCEED WITH TROUBLESHOOTING

HINT:



DTCs for the CAN communication system are as follows: U0073, U0100, U0101, U0114, U0123,
U0124, U0126, U0129, U0199, U0208, U1002, U1115, B1499, and B2621



Refer to the troubleshooting procedures of each system if DTCs regarding the CAN communication
system are not output.



Before measuring the resistance, leave the vehicle for at least 1 minute and do not operate the ignition
switch, any switches or doors. If doors need to be opened in order to check connectors, open the doors
and leave them open.

HINT:



Operating the ignition switch, any switches or any doors triggers related ECU and sensor communication
with the CAN, which causes resistance variation.



*: Use the Techstream.

1. VEHICLE BROUGHT TO WORKSHOP

2. INSPECT BATTERY VOLTAGE

NOTE:

Do not connect the tester directly to the DLC3 connector. Be sure to
use a service wire.

2009 Toyota Tundra

2009 ACCESSORIES & EQUIPMENT CAN Communication - Tundra

Standard voltage: 11 to 14 V

If the voltage is below 11V, recharge or replace the battery before proceeding.

3. CHECK AND CLEAR DTC*

a. Using the intelligent tester or Techstream, perform the ALL DTC check.

4. CHECK INSTALLED SYSTEMS (ECU AND SENSOR) THAT USE CAN COMMUNICATION

a. Based on the vehicle equipment and specifications, confirm the systems that use CAN

communication (see DIAGNOSIS SYSTEM ).

5. CHECK DLC3 BRANCH WIRE AND V BUS CIRCUIT MAIN WIRE (CANH - CANL)

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

Standard resistance

STANDARD RESISTANCE SPECIFICATION TABLE

Fig. 10: Identifying Terminals CANH And CANL Of DLC3 Connector
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

NOTE:



If a CAN communication malfunction code that informs that an
ECU or sensor has a power malfunction or interior malfunction
is causing a communication stop, the problem may not be in the
communication line. There is a high possibility that the ECU or
sensor has a signal transmission failure. Therefore, first
troubleshoot any DTCs related to the ECU or sensor.



When CAN communication related connectors are disconnected
with the ignition switch ON or ACC, the ECU related to the
connector and ECUs of related systems will store a CAN
communication DTC.

Tester Connection

Switch Condition

Specified Condition Proceed to

6 (CANH) - 14 (CANL) Ignition switch OFF

OK (54 to 69 ohms)

A

NG (70 ohms or higher)

B

NG (less than 54 ohms)

C

2009 Toyota Tundra

2009 ACCESSORIES & EQUIPMENT CAN Communication - Tundra

B: GO TO CAN MAIN WIRE FOR DISCONNECTION (See OPEN IN CAN MAIN WIRE )

C: GO TO CHECK CAN BUS LINES FOR SHORT CIRCUIT (See SHORT IN CAN BUS
LINES )

A: Go to Next Step

6. CHECK V BUS CIRCUIT +B (CANH, CANL - BAT)

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

Standard resistance

STANDARD RESISTANCE SPECIFICATION TABLE

Fig. 11: Identifying DLC3 Connector Terminal
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

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

OK: Go to Next Step

7. CHECK V BUS CIRCUIT GND (CANH, CANL - CG)

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

Standard resistance

STANDARD RESISTANCE SPECIFICATION TABLE

Tester Connection

Switch Condition Specified Condition

6 (CANH) - 16 (BAT)

Ignition switch OFF 6 kohms or higher

14 (CANL) - 16 (BAT)

Tester Connection Switch Condition Specified Condition
6 (CANH) - 4 (CG)

Ignition switch OFF 200 ohms or higher

14 (CANL) - 4 (CG)

2009 Toyota Tundra

2009 ACCESSORIES & EQUIPMENT CAN Communication - Tundra

Fig. 12: Identifying DLC3 Connector Terminal
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

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

OK: Go to Next Step

8. CHECK ECUS CONNECTED TO CAN BUS (USING TECHSTREAM)*

a. Select "CAN Bus Check" from the "System Select".

b. Wait 1 minute and then check the display of the connected ECUs and sensors.

INSPECTION RESULT REFERENCE TABLE

HINT:



If the display of an ECU is intermittent during the check, one side of an ECU or sensor
branch wire is open. (The signal of the ECU is treated as noise, which affects the response
and display of the Techstream.)



The main body ECU checks for proper ECU communication for ECUs that are connected to
the CAN MS bus circuit, and the results are displayed on the Techstream. If communication

Inspection Result

Proceed

to

All ECUs and sensors connected to CAN communication system displayed on screen.

A

Except for main body ECU, no ECUs connected to MS bus are displayed.
Main body ECU outputs MS bus malfunction code (U1002) (MS bus main wire open or
short malfunction).

B

No ECUs connected to MS bus are displayed (branch wire between main body ECU and
V bus circuit is open).

C

ECU or sensor that should be connected to CAN communication is not displayed (ECU
or sensor branch wire open).

D

ECU or sensor that should be connected to CAN communication is not displayed or
display is intermittent during check (ECU or sensor branch wire open on one side).

E

NOTE:

ECUs and sensors that are not present will not be displayed. Be
careful not to mistake them for communication stop malfunctions.

2009 Toyota Tundra

2009 ACCESSORIES & EQUIPMENT CAN Communication - Tundra