Toyota Tundra. Manual — part 2779

Standard Resistance

TESTER CONNECTION SPECIFIED CONDITION TABLE

Fig. 39: Identifying J31 ECU Connector (2 Of 2)
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

NG: REPLACE FUSE AND REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: REPLACE FUSE

TC AND CG TERMINAL CIRCUIT

DESCRIPTION

DTC output mode is set by connecting terminals TC and CG of the DLC3. The DTCs are indicated by the
blinking of the tire pressure warning light.

WIRING DIAGRAM

Tester Connection

Condition Specified Condition

J31-7 (IG) - Body ground Always

10 kohms or higher

2009 Toyota Tundra

2009 SUSPENSION Tire & Wheel - Tundra

Fig. 40: TC & CG Terminal - Wiring Diagram
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

HINT:

When each warning light continues blinking, a ground short in the wiring of terminal TC of the DLC3 or an
internal ground short in each ECU is suspected.

INSPECTION PROCEDURE

1. CHECK HARNESS AND CONNECTOR (DLC3 - ECU AND BODY GROUND)

a. Disconnect the J31 ECU connector.

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

Standard Resistance

TESTER CONNECTION SPECIFIED CONDITION TABLE

NOTE:



When replacing the tire pressure warning ECU, read the transmitter IDs
stored in the old ECU using the Techstream and write them down before
removal.



It is necessary to perform INITIALIZATION after REGISTRATION of the
transmitter IDs into the tire pressure warning ECU after the ECU and/or tire
pressure warning valve and transmitter has been replaced.

Tester Connection

Condition Specified Condition

J31-3 (TC) - J17-13 (TC)

Always

Below 1 ohms

J31-3 (TC) - Body ground

Always

10 kohms or higher

J17-4 (CG) - Body ground Always

Below 1 ohms

2009 Toyota Tundra

2009 SUSPENSION Tire & Wheel - Tundra

Fig. 41: Identifying J31 ECU Connector
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

NG : REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: CHECK ECU POWER SOURCE CIRCUIT (See ECU POWER SOURCE CIRCUIT )

TIRE PRESSURE WARNING RECEIVER

COMPONENTS

2009 Toyota Tundra

2009 SUSPENSION Tire & Wheel - Tundra

Fig. 42: Identifying Tire Pressure Warning Receiver Replacement Components With Torque
Specifications
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

REMOVAL

1. REMOVE ROOF HEADLINING ASSEMBLY

a. for Regular Cab:

Remove the roof headlining (see COMPONENTS ).

b. for Double Cab:

Remove the roof headlining (see REMOVAL ).

2009 Toyota Tundra

2009 SUSPENSION Tire & Wheel - Tundra