Toyota Tundra. Manual — part 290

Fig. 85: Identifying J92 No. 2 Junction Connector
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

NG: Go to step 8

OK: Go to Next Step

7. CHECK FOR OPEN IN CAN BUS MAIN WIRE (NO. 1 JUNCTION CONNECTOR - NO. 2

JUNCTION CONNECTOR)

a. Disconnect the J93 No. 2 junction connector connector.

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

Standard resistance

STANDARD RESISTANCE SPECIFICATION TABLE

Tester Connection

Switch Condition Specified Condition

J93-1 (CANH) - J93-2 (CANL) Ignition switch OFF

108 to 132 ohms

2009 Toyota Tundra

2009 ACCESSORIES & EQUIPMENT CAN Communication - Tundra

Fig. 86: Identifying J93 No. 2 Junction Connector Terminals
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

NG: REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR (NO. 1 JUNCTION
CONNECTOR - NO. 2 JUNCTION CONNECTOR)

OK: REPLACE NO. 2 JUNCTION CONNECTOR

8. CONNECT CONNECTOR

a. Reconnect the J92 No. 1 junction connector connector.

9. CHECK FOR OPEN IN CAN BUS MAIN WIRE (ECM - NO. 2 JUNCTION CONNECTOR)

a. Disconnect the A24 ECM connector.

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

Standard resistance

STANDARD RESISTANCE SPECIFICATION TABLE

Result

RESULT REFERENCE TABLE

Tester Connection

Switch Condition Specified Condition

A24-10 (CANH) - A24-11 (CANL) Ignition switch OFF

108 to 132 ohms

Result

Proceed to

OK (for 1GR-FE)

A

OK (for 2UZ-FE)

B

OK (for 3UR-FE)

C

NG

D

2009 Toyota Tundra

2009 ACCESSORIES & EQUIPMENT CAN Communication - Tundra

Fig. 87: Identifying A24 ECM Connector Terminals
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

B: REPLACE ECM (See REMOVAL )

C: REPLACE ECM (See REMOVAL )

D: REPAIR OR REPLACE CAN MAIN WIRE CONNECTED TO ECM (ECM - NO. 2
JUNCTION CONNECTOR)

A: REPLACE ECM (See REMOVAL )

10. CONNECT CONNECTOR

a. Reconnect the J84 No. 1 junction connector connector.

11. CHECK FOR OPEN IN CAN BUS MAIN WIRE (COMBINATION METER ECU - NO. 1

JUNCTION CONNECTOR)

a. Disconnect the J28 combination meter ECU connector.

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

Standard resistance

STANDARD RESISTANCE SPECIFICATION TABLE

Tester Connection

Switch Condition Specified Condition

J28-33 (CANH) - J28-34 (CANL) Ignition switch OFF

108 to 132 ohms

2009 Toyota Tundra

2009 ACCESSORIES & EQUIPMENT CAN Communication - Tundra

Fig. 88: Identifying J28 Combination Meter ECU Connector Terminals
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

NG: REPAIR OR REPLACE CAN MAIN WIRE CONNECTED TO COMBINATION METER
ECU (COMBINATION METER ECU - NO. 1 JUNCTION CONNECTOR)

OK: REPLACE COMBINATION METER ASSEMBLY (See REMOVAL )

SHORT IN CAN BUS LINES

DESCRIPTION

There may be a short circuit between the CAN bus lines when the resistance between terminals 6 (CANH) and
14 (CANL) of the DLC3 is below 54 ohms.

SYMPTOM TABLE

Symptom

Trouble Area

Resistance between terminals 6 (CANH) and 14 (CANL) of DLC3 is
below 54 ohms.



Short between CAN bus
lines



Combination meter ECU



Main body ECU



Skid control ECU with
actuator



Steering angle sensor



Center airbag sensor



Bus buffer ECU*1



Air conditioning amplifier



ECM



4WD control ECU*2

2009 Toyota Tundra

2009 ACCESSORIES & EQUIPMENT CAN Communication - Tundra