Toyota Tundra. Manual — part 422

B: REPLACE FUEL SENDER GAUGE ASSEMBLY (See REMOVAL )

C: REPLACE FUEL SENDER GAUGE ASSEMBLY (See REMOVAL )

D: REPLACE FUEL SENDER GAUGE ASSEMBLY (See REMOVAL )

E: REPLACE FUEL SENDER GAUGE ASSEMPBLY (See REMOVAL

A: REPLACE COMBINATION METER ASSEMBLY (see REMOVAL )

DTC U0100 LOST COMMUNICATION WITH ECM / PCM "A"

DESCRIPTION

The combination meter communicates with the ECM via the CAN line.

DTC U0100 LOST COMMUNICATION WITH ECM / PCM "A" DETECTION CONDITION
REFERENCE

WIRING DIAGRAM

Result is not as specified (for 3UR-FBE)

E

DTC

Code

DTC Detection Condition

Trouble Area

U0100

When either of following conditions is detected:



Vehicle speed 5 km/h (3 mph) or more and IG voltage 10.5 V or
more



No communication with ECM continues for 3 seconds or more (No
communication to ECM or skid control ECU continues for 60
seconds or more)

CAN
communication
system

2009 Toyota Tundra

2009 ACCESSORIES AND EQUIPMENT Meter - Tundra

Fig. 29: Lost Communication With ECM / PCM "A" - Wiring Diagram
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

INSPECTION PROCEDURE

1. CHECK FOR DTC

a. Check for DTCs and note any codes that are output (see DTC CHECK/CLEAR ).

b. Clear the DTC (see DTC CHECK/CLEAR ).

c. Recheck for DTC (see DTC CHECK/CLEAR ).

Result

DTC RESULT REFERENCE

HINT:

If the CAN communication system DTC U0100 and another DTC are output at the same time,
perform troubleshooting for the CAN communication system DTC U0100 first.

B: Go to CAN COMMUNICATION SYSTEM (See CAN COMMUNICATION SYSTEM )

A: USE SIMULATION METHOD TO CHECK (See HOW TO PROCEED WITH
TROUBLESHOOTING )

DTC U0129 LOST COMMUNICATION WITH BRAKE SYSTEM CONTROL MODULE

Result

Proceed to

CAN communication system DTC is not output

A

CAN communication system DTC is output

B

2009 Toyota Tundra

2009 ACCESSORIES AND EQUIPMENT Meter - Tundra

DESCRIPTION

The combination meter communicates with the skid control ECU via the CAN line.

DTC U0129 LOST COMMUNICATION WITH BRAKE SYSTEM CONTROL MODULE
DETECTION CONDITION REFERENCE

WIRING DIAGRAM

Fig. 30: Lost Communication With Brake System Control Module - Wiring Diagram
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

INSPECTION PROCEDURE

1. CHECK FOR DTC

a. Check for DTCs and note any codes that are output (see DTC CHECK/CLEAR ).

b. Clear the DTC (see DTC CHECK/CLEAR ).

c. Recheck for DTC (see DTC CHECK/CLEAR ).

DTC

Code

DTC Detection Condition

Trouble Area

U0129

When either of following conditions is detected:



15 seconds have elapsed since engine started and IG voltage 10.5 V
or more



No communication with skid control ECU continues for 3 seconds or
more (No communication with ECM or skid control ECU continues
for 60 seconds or more)

CAN
communication
system

2009 Toyota Tundra

2009 ACCESSORIES AND EQUIPMENT Meter - Tundra

Result

DTC RESULT REFERENCE

HINT:

If the CAN communication system DTC U0129 and another DTC are output at the same time,
perform troubleshooting for the CAN communication system DTC U0129 first.

B: Go to CAN COMMUNICATION SYSTEM (See CAN COMMUNICATION SYSTEM )

A: USE SIMULATION METHOD TO CHECK (See HOW TO PROCEED WITH
TROUBLESHOOTING )

ENTIRE COMBINATION METER DOES NOT OPERATE

DESCRIPTION

This circuit is the power source circuit for the combination meter. This circuit provides 2 power source types:
one is a constant power source mainly used as a backup power source, and other is a power source mainly used
for signal transmission. The constant power source is mainly used as a backup power source of the meter CPU.
However, it is also used for communication. If a voltage of 12 V is not applied to terminal IG+ when the
ignition switch ON, the indicator will not operate.

WIRING DIAGRAM

Result

Proceed to

CAN communication system DTC is not output

A

CAN communication system DTC is output

B

2009 Toyota Tundra

2009 ACCESSORIES AND EQUIPMENT Meter - Tundra