Toyota Tundra. Manual — part 296

Fig. 110: Identifying J88 No. 2 Junction Connector Terminals
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

NG: REPAIR OR REPLACE CAN BRANCH WIRE CONNECTED TO 4WD CONTROL ECU
(CANH, CANL)

OK: REPLACE 4WD CONTROL ECU (See REMOVAL )

25. CHECK FOR SHORT IN CAN BUS WIRES (ECM)

a. Disconnect the A24 ECM connector.

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

Result

RESULT REFERENCE TABLE

Tester Connection

Switch Condition

Measured

Resistance

Result

Proceed

to

J92-1 (CANH) - J92-2

(CANL)

Ignition switch

OFF

1 ohms or higher

OK (for 1GR-

FE)

A

OK (for 2UZ-

FE)

B

OK (for 3UR-

FE)

C

Below 1 ohms

NG

D

2009 Toyota Tundra

2009 ACCESSORIES & EQUIPMENT CAN Communication - Tundra

Fig. 111: Identifying J92 No. 2 Junction Connector
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 (CANH, CANL)

A: REPLACE ECM (See REMOVAL )

SHORT TO B+ IN CAN BUS LINE

DESCRIPTION

There may be a short circuit between the CAN bus line and +B when there is resistance between terminals 6
(CANH) and 16 (BAT) or terminals 14 (CANL) and 16 (BAT) of the DLC3.

SYMPTOM TABLE

Symptom

Trouble Area

There is resistance between terminals 6 (CANH) and 16 (BAT) or
terminals 14 (CANL) and 16 (BAT) of DLC3.



Short to +B



Combination meter
ECU



Main body ECU



Skid control ECU with
actuator



Steering angle sensor



Center airbag sensor



Bus buffer ECU*1



Air conditioning

2009 Toyota Tundra

2009 ACCESSORIES & EQUIPMENT CAN Communication - Tundra

WIRING DIAGRAM

amplifier



ECM



4WD control ECU*2



No. 1 junction
connector



No. 2 junction
connector

HINT:



*1: w/ Bus Buffer ECU



*2: w/ 4WD

2009 Toyota Tundra

2009 ACCESSORIES & EQUIPMENT CAN Communication - Tundra

Fig. 112: Identifying Short To B+ In CAN Bus Line - Wiring Diagram (1 Of 2)
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

2009 Toyota Tundra

2009 ACCESSORIES & EQUIPMENT CAN Communication - Tundra