Toyota Tundra. Manual — part 302

Result

RESULT REFERENCE TABLE

Fig. 133: Identifying J88 No. 2 Junction And J17 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 TO B+ IN CAN BUS WIRE (ECM)

a. Disconnect the A24 ECM connector.

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

Tester Connection

Switch Condition Measured Resistance Proceed to

J88-1 (CANH) - J17-16 (BAT)

Ignition switch OFF

1 ohms or higher

OK

J88-2 (CANL) - J17-16 (BAT)

J88-1 (CANH) - J17-16 (BAT)

Ignition switch OFF

Below 1 ohms

NG

J88-2 (CANL) - J17-16 (BAT)

2009 Toyota Tundra

2009 ACCESSORIES & EQUIPMENT CAN Communication - Tundra

Result

RESULT REFERENCE TABLE

Tester

Connection

Switch

Condition

Measured

Resistance

Result

Proceed to

J92-1

(CANH) -

J17-16
(BAT)

Ignition

switch OFF

1 ohms or

higher

OK (for

1GR-FE)

A

OK (for

2UZ-FE)

B

OK (for

3UR-FE)

C

J92-2

(CANL) -

J17-16
(BAT)

Ignition

switch OFF

1 ohms or

higher

OK (for

1GR-FE)

A

OK (for

2UZ-FE)

B

OK (for

3UR-FE)

C

J92-1

(CANH) -

J17-16
(BAT)

Ignition

switch OFF

Below 1

ohms

NG

D

J92-2

(CANL) -

J17-16
(BAT)

Ignition

switch OFF

Below 1

ohms

NG

D

2009 Toyota Tundra

2009 ACCESSORIES & EQUIPMENT CAN Communication - Tundra

Fig. 134: Identifying J92 No. 2 Junction And J17 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 (CANH, CANL)

A: REPLACE ECM (See REMOVAL )

SHORT TO GND IN CAN BUS LINE

DESCRIPTION

There may be a short circuit between the CAN bus line and GND when there is resistance between terminals 6
(CANH) and 4 (CG) or terminals 14 (CANL) and 4 (CG) of the DLC3.

SYMPTOM TABLE

Symptom

Trouble Area



Short to GND

2009 Toyota Tundra

2009 ACCESSORIES & EQUIPMENT CAN Communication - Tundra

WIRING DIAGRAM

There is resistance between terminals 6 (CANH) and 4 (CG) or terminals
14 (CANL) and 4 (CG) of DLC3.



Combination meter ECU



Main body ECU



Skid control ECU with
actuator



Steering angle sensor 1



Center airbag sensor



Bus buffer ECU*1



Air conditioning
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