Toyota Tundra. Manual — part 284

HINT:

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

1. DISCONNECT CABLE FROM NEGATIVE BATTERY TERMINAL

a. Disconnect the cable from the negative (-) battery terminal before measuring the resistances of the

main wire and the branch wire.

2. CHECK FOR OPEN IN CAN BUS WIRE (STEERING ANGLE SENSOR BRANCH WIRE)

a. Disconnect the J6 steering angle sensor connector.

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

Standard resistance

STANDARD RESISTANCE SPECIFICATION TABLE

Fig. 63: Identifying J6 Steering Angle Sensor Connector Terminals

CAUTION: Wait at least 90 seconds after disconnecting the cable from the

negative (-) battery terminal to prevent airbag and seat belt
pretensioner activation.

NOTE:

After the ignition switch is turned OFF, the navigation system
requires approximately 90 seconds to record various types of
memory and settings. As a result, after turning the ignition switch
OFF, wait 90 seconds or more before disconnecting the cable from
the negative (-) battery terminal.

Tester Connection

Switch Condition Specified Condition

J6-10 (CANH) - J6-9 (CANL) Ignition switch OFF

54 to 69 ohms

2009 Toyota Tundra

2009 ACCESSORIES & EQUIPMENT CAN Communication - Tundra

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

NG: REPAIR OR REPLACE STEERING ANGLE SENSOR BRANCH WIRE OR CONNECTOR
(CANH, CANL)

OK: Go to Next Step

3. CHECK HARNESS AND CONNECTOR (STEERING ANGLE SENSOR - BATTERY AND

BODY GROUND)

a. Reconnect the cable to the negative (-) battery terminal before measuring the resistances of the

main wire and the branch wire.

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

Standard resistance

STANDARD RESISTANCE SPECIFICATION TABLE

c. Measure the voltage according to the value(s) in the table below.

Standard voltage

STANDARD VOLTAGE SPECIFICATION TABLE

Fig. 64: Identifying J6 Steering Angle Sensor Connector Terminals
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

Tester Connection

Condition Specified Condition

J6-2 (ESS) - Body ground Always

Below 1 ohms

Tester Connection

Switch Condition Specified Condition

J6-3 (BAT) - Body ground

Always

11 to 14 V

J6-1 (IG) - Body ground Ignition switch ON

2009 Toyota Tundra

2009 ACCESSORIES & EQUIPMENT CAN Communication - Tundra

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: REPLACE STEERING ANGLE SENSOR (See REMOVAL )

ECM COMMUNICATION STOP MODE

DESCRIPTION

SYMPTOM TABLE

WIRING DIAGRAM

Detection Item

Symptom

Trouble Area

ECM COMMUNICATION
STOP MODE

When either condition below is met:



Engine is not displayed on "CAN Bus Check".



Applies to "ECM COMMUNICATION STOP
MODE" in "DTC COMBINATION TABLE".



Power source
or ECM



Harness or
connector



ECM

2009 Toyota Tundra

2009 ACCESSORIES & EQUIPMENT CAN Communication - Tundra

Fig. 65: Identifying ECM Communication Stop Mode - Wiring Diagram (1 Of 2)
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

2009 Toyota Tundra

2009 ACCESSORIES & EQUIPMENT CAN Communication - Tundra