Toyota Tundra (2015 year). Manual — part 2699
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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 (NETWORK GATEWAY ECU CAN BRANCH
WIRE)
(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
J123-16 (CA1H) - J123-15 (CA1L)
Ignition switch off
54 to 69 Ω
Text in Illustration
*a
NG
REPAIR OR REPLACE NETWORK GATEWAY ECU CAN
BRANCH WIRE OR CONNECTOR (CA1H, CA1L)
CAN COMMUNICATION: CAN COMMUNICATION SYSTEM: Gatew...
OK
4.
CHECK HARNESS AND CONNECTOR (NETWORK GATEWAY ECU - 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) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
TESTER CONNECTION
CONDITION
SPECIFIED CONDITION
J123-4 (GND) - Body ground
Always
Below 1 Ω
(c) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
TESTER CONNECTION
CONDITION
SPECIFIED CONDITION
J123-2 (BATT) - Body ground
Always
11 to 14 V
J123-10 (IG1) - Body ground
Ignition switch ON
11 to 14 V
J123-9 (IG2) - Body ground
Ignition switch ON
11 to 14 V
Text in Illustration
*a
NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK
REPLACE NETWORK GATEWAY ECU
CAN COMMUNICATION: CAN COMMUNICATION SYSTEM: Gatew...
Last Modified: 9-16-2014
6.6 J
Doc ID: RM000002VTC012X
Model Year: 2015
Model: Tundra
Prod Date Range: [08/2014 - ]
Title: CAN COMMUNICATION: CAN COMMUNICATION SYSTEM: ECM Communication Stop Mode; 2015 MY Tundra
[08/2014 - ]
ECM Communication Stop Mode
DESCRIPTION
DETECTION ITEM
SYMPTOM
TROUBLE AREA
ECM Communication
Stop Mode
Either condition is met:
"ECM (Engine)" is not displayed on the "Bus
Check" screen.
"ECM Communication Stop Mode" in "DTC
Combination Table" applies.
Power source or
inside ECM
ECM
WIRING DIAGRAM
INSPECTION PROCEDURE
CAN COMMUNICATION: CAN COMMUNICATION SYSTEM: ECM ...
NOTICE:
Inspect the fuses for circuits related to this system before performing the following inspection procedure.
PROCEDURE
1.
CHECK HARNESS AND CONNECTOR (ECM - BATTERY AND BODY GROUND)
(a) Disconnect the A24 and D74 ECM connectors.
Text in Illustration
*a
-
-
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
TESTER CONNECTION
CONDITION
SPECIFIED CONDITION
D74-42 (E02) - Body ground
Always
Below 1 Ω
D74-43 (E01) - Body ground
Always
Below 1 Ω
D74-81 (E1) - Body ground
Always
Below 1 Ω
D74-82 (ME01) - Body ground
Always
Below 1 Ω
(c) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
TESTER CONNECTION
CONDITION
SPECIFIED
CONDITION
A24-1 (BATT) - Body ground
Always
11 to 14 V
A24-2 (+B2) - Body ground
Battery positive (+) voltage applied to terminal A24-34
(MREL)
11 to 14 V
A24-3 (+B) - Body ground
Battery positive (+) voltage applied to terminal A24-34
(MREL)
11 to 14 V
CAN COMMUNICATION: CAN COMMUNICATION SYSTEM: ECM ...
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