Toyota Tundra (2015 year). Manual — part 2686
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INSPECTION PROCEDURE
HINT:
Operating the ignition switch, any 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 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
.
CAN COMMUNICATION: CAN COMMUNICATION SYSTEM: U1002...
NEXT
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:
MALFUNCTION
J123-13 (CA2H) -
J123-12 (CA2L)
Ignition
switch off
54 to 69 Ω
Below 53 Ω: Short in
line
J123-13 (CA2H) -
J123-12 (CA2L)
Ignition
switch off
54 to 69 Ω
Higher than 70 Ω:
Open in CAN main
bus line
J123-13 (CA2H) -
J123-2 (BATT)
Ignition
switch off
6 kΩ or
higher
Below 6 kΩ: +B
short
J123-12 (CA2L) -
J123-2 (BATT)
Ignition
switch off
6 kΩ or
higher
Below 6 kΩ: +B
short
J123-13 (CA2H) -
J123-4 (GND)
Ignition
switch off
200 Ω or
higher
Below 200 Ω:
Ground short
J123-12 (CA2L) -
J123-4 (GND)
Ignition
switch off
200 Ω or
higher
Below 200 Ω:
Ground short
Text in Illustration
*a
Component with harness connected
(Network Gateway ECU)
Result
RESULT
PROCEED TO
NG
Open in CAN main bus line
A
NG
Short in line
+B short
GND short
B
OK
C
CAN COMMUNICATION: CAN COMMUNICATION SYSTEM: U1002...
A
OK
B
GO TO STEP 10
C
GO TO STEP 19
4.
CHECK FOR OPEN IN CAN BUS WIRE (NO. 4 JUNCTION CONNECTOR - NETWORK
GATEWAY ECU)
(a) Disconnect the R17 No. 5 junction connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
TESTER CONNECTION
SWITCH CONDITION
SPECIFIED CONDITION
R17-1 (CANH) - R17-4 (CANL)
Ignition switch off
108 to 132 Ω
Text in Illustration
*a
NG
GO TO STEP 6
5.
CHECK FOR OPEN IN CAN BUS WIRE (NO. 4 JUNCTION CONNECTOR - NO. 5
JUNCTION CONNECTOR)
CAN COMMUNICATION: CAN COMMUNICATION SYSTEM: U1002...
NEXT
(a) Measure the resistance according to the value(s) in the table
below.
Standard Resistance:
TESTER CONNECTION
SWITCH
CONDITION
SPECIFIED
CONDITION
R17-2 (CANH) - R17-3
(CANL)
Ignition switch off
108 to 132 Ω
Text in Illustration
*a
NG
GO TO STEP 8
OK
REPLACE NO. 4 JUNCTION CONNECTOR
6.
CONNECT CONNECTOR
(a) Reconnect the R17 No. 4 junction connector.
7.
CHECK FOR OPEN IN CAN BUS WIRE (NETWORK GATEWAY ECU)
(a) Disconnect the J123 network gateway ECU connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
TESTER CONNECTION
SWITCH CONDITION
SPECIFIED CONDITION
J123-13 (CA2H) - J123-12 (CA2L)
Ignition switch off
108 to 132 Ω
CAN COMMUNICATION: CAN COMMUNICATION SYSTEM: U1002...
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