Toyota Tundra. Manual — part 422
![](/vehicles/linovind/mig/whoceedonodb/myond.png)
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
![](/vehicles/linovind/mig/whoceedonodb/ldre.png)
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
![](/vehicles/linovind/mig/whoceedonodb/ber.png)
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
![](/vehicles/linovind/mig/whoceedonodb/edisht.png)
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
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