Toyota Tundra (2015 year). Manual — part 2685
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NOTICE:
Inspect the fuses for circuits related to this system before performing the following 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
(a) Disconnect the cable from the negative (-) battery terminal before measuring the resistances of
the CAN main wire and the CAN 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 FOR OPEN IN CAN BUS WIRE (FRONT POWER SEAT CONTROL ECU AND
SWITCH LH CAN BRANCH WIRE)
CAN COMMUNICATION: CAN COMMUNICATION SYSTEM: U0208;...
OK
(a) Disconnect the Z10 front power seat control ECU and switch
LH connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
TESTER CONNECTION
SWITCH CONDITION
SPECIFIED CONDITION
Z10-8 (CANP) - Z10-7 (CANN)
Ignition switch off
54 to 69 Ω
Text in Illustration
*a
NG
REPAIR OR REPLACE FRONT POWER SEAT
CONTROL ECU AND SWITCH LH CAN BRANCH WIRE
OR CONNECTOR (CANP, CANN)
4.
CHECK HARNESS AND CONNECTOR (FRONT POWER SEAT CONTROL ECU AND
SWITCH LH - BATTERY AND BODY GROUND)
(a) Connect the cable to the negative (-) battery terminal.
NOTICE:
When disconnecting the cable, some systems need to be
initialized after the cable is reconnected
.
(b) Disconnect the Z9 front power seat control ECU and switch LH connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
CAN COMMUNICATION: CAN COMMUNICATION SYSTEM: U0208;...
TESTER CONNECTION
CONDITION
SPECIFIED CONDITION
Z9-2 (GND1) - Body ground
Always
Below 1 Ω
(d) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
TESTER CONNECTION
CONDITION
SPECIFIED CONDITION
Z9-7 (+B1) - Body ground
Always
11 to 14 V
Z10-12 (SYSB) - Body ground
Always
11 to 14 V
Text in Illustration
*a
NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK
REPLACE FRONT POWER SEAT CONTROL ECU AND
SWITCH LH
CAN COMMUNICATION: CAN COMMUNICATION SYSTEM: U0208;...
Last Modified: 9-16-2014
6.6 C
Doc ID: RM000004U3300AX
Model Year: 2015
Model: Tundra
Prod Date Range: [08/2014 - ]
Title: CAN COMMUNICATION: CAN COMMUNICATION SYSTEM: U1002 (CAN No. 2 BUS); Lost Communication
with Gateway Module (Network Gateway ECU); 2015 MY Tundra [08/2014 - ]
DTC
U1002
(CAN No.
2 BUS)
Lost Communication with Gateway Module (Network Gateway ECU)
DESCRIPTION
The network gateway ECU stores this DTC when no signals can be received from the ECUs that have
been memorized as those connected to the CAN V2 bus.
When the network gateway ECU receives a response signal from the ECUs connected to the CAN V2
bus, the network gateway ECU recognizes and memorizes that the ECU is connected to the CAN V2 bus.
Based on this memorized data, the network gateway ECU monitors for malfunctions in the ECUs
connected to the CAN V2 bus when communicating with those ECUs. If the network gateway ECU
cannot receive response signals from the ECUs that have been memorized as those connected to the
CAN V2 bus, the network gateway ECU determines that a malfunction exists.
DTC
CODE
DTC DETECTION CONDITION
TROUBLE AREA
U1002
Lost communication with the gateway
module.
V2 bus circuit
Network gateway ECU CAN main wire or
connector
Blind spot monitor sensor RH CAN branch wire or
connector
Network gateway ECU
Blind spot monitor sensor RH
No. 4 junction connector
No. 5 junction connector
For vehicles with a blind spot monitor system.
WIRING DIAGRAM
CAN COMMUNICATION: CAN COMMUNICATION SYSTEM: U1002...
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