Toyota Tundra (2015 year). Manual — part 2690
Last Modified: 9-16-2014
6.6 C
Doc ID: RM000002VTM00UX
Model Year: 2015
Model: Tundra
Prod Date Range: [08/2014 - ]
Title: CAN COMMUNICATION: CAN COMMUNICATION SYSTEM: U1002; Lost Communication with Gateway
Module; 2015 MY Tundra [08/2014 - ]
DTC
U1002
Lost Communication with Gateway Module
DESCRIPTION
The main body ECU stores this DTC when no signals can be received from the ECUs that have been
memorized as those connected to the CAN MS bus.
When the main body ECU receives a response signal from the ECUs connected to the CAN MS bus, the
main body ECU recognizes and memorizes that the ECU is connected to the CAN MS bus. Based on this
memorized data, the main body ECU monitors for malfunctions in the ECUs connected to the CAN MS
bus when communicating with those ECUs. If the main body ECU cannot receive response signals from
the ECUs that have been memorized as those connected to the CAN MS bus, the main body ECU
determines that a malfunction exists.
DTC
CODE
DTC DETECTION CONDITION
TROUBLE AREA
U1002
Lost communication with
gateway module
MS bus circuit
Front power seat control ECU and switch LH CAN branch
wire or connector
Multiplex tilt and telescopic ECU CAN branch wire or
connector
Outer mirror control ECU assembly CAN branch wire or
connector
Combination meter assembly CAN main wire or
connector
Main body ECU (driver side junction block assembly) CAN
main wire or connector
Front power seat control ECU and switch LH
Multiplex tilt and telescopic ECU
Outer mirror control ECU assembly
Combination meter assembly
Main body ECU (driver side junction block assembly)
No. 3 junction connector
For vehicle with a seat memory.
WIRING DIAGRAM
CAN COMMUNICATION: CAN COMMUNICATION SYSTEM: U1002;...
NEXT
INSPECTION PROCEDURE
HINT:
Operating the ignition switch, any other switches or any doors triggers related ECU and sensor
communication with the CAN, which causes resistance variation.
PROCEDURE
1.
PRECAUTION
NOTICE:
After turning the ignition switch off, waiting time may be required before disconnecting the cable from the
battery terminal. Therefore, make sure to read the disconnecting the cable from the battery terminal notice
before proceeding with work
.
2.
DISCONNECT CABLE FROM NEGATIVE BATTERY TERMINAL
CAN COMMUNICATION: CAN COMMUNICATION SYSTEM: U1002;...
NEXT
(a) Disconnect the cable from the negative (-) battery terminal before measuring the resistances of
the main wire and the branch wire.
CAUTION:
Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to disable the
SRS system.
NOTICE:
When disconnecting the cable, some systems need to be initialized after the cable is reconnected
.
3.
CHECK CAN BUS WIRE (CHECK MAIN WIRE FOR DISCONNECTION, CHECK BUS LINE
FOR SHORT)
(a) Measure the resistance according to the value(s) in the
table below.
Standard Resistance:
TESTER
CONNECTION
SWITCH
CONDITION
SPECIFIED
CONDITION
RESISTANCE OF
MALFUNCTION
J28-18 (MSCH) -
J28-19 (MSCL)
Ignition
switch off
54 to 69 Ω
Below 53 Ω: Short
in line
J28-18 (MSCH) -
J28-19 (MSCL)
Ignition
switch off
54 to 69 Ω
70 Ω or higher:
Open in CAN main
bus line
J28-18 (MSCH) -
J28-1 (B)
Ignition
switch off
6 kΩ or higher
Below 6 kΩ: +B
short
J28-19 (MSCL) -
J28-1 (B)
Ignition
switch off
6 kΩ or higher
Below 6 kΩ: +B
short
J28-18 (MSCH) -
J28-24 (ES)
Ignition
switch off
200 Ω or
higher
Below 200 Ω:
Ground short
J28-19 (MSCL) -
J28-24 (ES)
Ignition
switch off
200 Ω or
higher
Below 200 Ω:
Ground short
Text in Illustration
*a
Component with harness connected
(Combination Meter Assembly)
Result
RESULT
PROCEED TO
NG
A
CAN COMMUNICATION: CAN COMMUNICATION SYSTEM: U1002;...
A
RESULT
PROCEED TO
Open in CAN main wire
NG
Short in line
+B short
Ground short
B
OK
C
B
GO TO STEP 10
C
GO TO STEP 25
4.
CHECK FOR OPEN IN CAN BUS WIRE (NO. 3 JUNCTION CONNECTOR - MAIN BODY
ECU)
(a) Disconnect the J76 No. 3 junction connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
TESTER CONNECTION
SWITCH CONDITION
SPECIFIED CONDITION
J76-4 (CANH) - J76-15 (CANL)
Ignition switch off
108 to 132 Ω
Text in Illustration
*a
NG
GO TO STEP 8
CAN COMMUNICATION: CAN COMMUNICATION SYSTEM: U1002;...
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