RM35X0E _57 Power Source / Network _078518 NETWORKING _0381088 CAN COMMUNICATION SYSTEM J

NETWORKING  CAN COMMUNICATION SYSTEM  Check CAN Communication Connection  


DESCRIPTION

Symptom Trouble Area
Communication between Vehicle and Diagnostic Tool is not Possible
·

V bus branch wire or connector

·

Power source circuit of central gateway ECU (network gateway ECU)

·

Central gateway ECU (network gateway ECU) ground circuit

·

Central gateway ECU (network gateway ECU)

·

DLC3 power source circuit

·

DLC3 ground circuit



WIRING DIAGRAM

C413744
0.917,2.188 1.229,2.385 0.313,0.198 10 false N8 0.917,2.365 1.417,2.573 0.5,0.208 10 false DLC3 1.042,1.781 1.354,1.979 0.313,0.198 10 false CG 1.042,1.177 1.354,1.375 0.313,0.198 10 false BAT 0.771,1.073 1.083,1.271 0.313,0.198 10 false 16 0.813,1.656 1.125,1.854 0.313,0.198 10 false 4 2.667,0.365 3.5,0.552 0.833,0.188 10 false OBD 3.552,0.521 4.385,0.708 0.833,0.188 10 false from Battery 1.552,1.177 2.052,1.396 0.5,0.219 10 false CANH 1.573,1.771 2.073,1.99 0.5,0.219 10 false CANL 2.063,1.635 2.375,1.833 0.313,0.198 10 false 14 2.083,1.073 2.396,1.271 0.313,0.198 10 false 6 5.594,1.073 6.094,1.292 0.5,0.219 10 false CA6H 5.594,1.885 6.094,2.104 0.5,0.219 10 false CA6L 5.344,1.656 5.844,1.875 0.5,0.219 10 false 5 5.302,1.063 5.802,1.281 0.5,0.219 10 false 14 5.594,2.292 6.094,2.51 0.5,0.219 10 false BAT 5.354,2.135 5.854,2.354 0.5,0.219 10 false 1 4.167,2.135 5.125,2.354 0.958,0.219 10 false ECU-B NO.3 2.615,2.281 3.573,2.5 0.958,0.219 10 false from Battery 4.177,2.635 5.135,2.854 0.958,0.219 10 false ECU-ACC 5.594,2.823 6.094,3.042 0.5,0.219 10 false ACC 5.354,2.635 5.854,2.854 0.5,0.219 10 false 2 2.385,2.792 3.531,3.042 1.146,0.25 10 false from ACC Relay 5.604,3.313 6.104,3.531 0.5,0.219 10 false IG2 5.313,3.208 5.813,3.427 0.5,0.219 10 false 12 4.167,3.188 5.125,3.406 0.958,0.219 10 false IG2 NO.2 2.083,3.302 3.531,3.594 1.448,0.292 10 false from IG2-NO.2 Relay 3.823,4.24 5.135,4.479 1.313,0.24 10 false ECU-IG1 NO.4*2 1.948,4.406 3.583,4.938 1.635,0.531 10 false from IG1 NO.2 Relay*2 1.26,3.854 3.781,4.115 2.521,0.26 10 false from Engine Stop and Start ECU*1 4.177,3.729 5.135,3.948 0.958,0.219 10 false *1 5.063,4.115 5.365,4.354 0.302,0.24 10 false *2 5.594,3.823 6.094,4.042 0.5,0.219 10 false IG1 5.302,3.74 5.802,3.958 0.5,0.219 10 false 11 5.594,5.188 6.094,5.406 0.5,0.219 10 false GND 5.302,5.042 5.802,5.26 0.5,0.219 10 false 10 5.188,5.438 5.688,5.656 0.5,0.219 10 false N21 5.177,5.615 6.823,6.01 1.646,0.396 10 false Central Gateway ECU (Network Gateway ECU) 0.229,5.719 2.75,5.979 2.521,0.26 10 false *1: w/ Stop and Start System 0.24,6.115 2.76,6.375 2.521,0.26 10 false *2: w/o Stop and Start System

CAUTION / NOTICE / HINT

CAUTION:

When performing the confirmation driving pattern, obey all speed limits and traffic laws.


NOTICE:
·

Because the order of diagnosis is important to allow correct diagnosis, make sure to begin troubleshooting using How to Proceed with Troubleshooting when CAN communication system related DTCs are output.

Click herePower Source / Network>NETWORKING>CAN COMMUNICATION SYSTEM>HOW TO PROCEED WITH TROUBLESHOOTING

·

Inspect the fuses for circuits related to this system before performing the following procedure.

·

Before measuring the resistance of the CAN bus, turn the ignition switch off and leave the vehicle for 1 minute or more without operating the key or any switches, or opening or closing the doors. After that, disconnect the cable from the negative (-) battery terminal and leave the vehicle for 10 minutes or more before measuring the resistance.

·

After the ignition switch is turned off, there may be a waiting time before disconnecting the negative (-) battery terminal.

Click hereGeneral>SETUP>WHEN DISCONNECTING OR RECONNECTING BATTERY TERMINAL>BEFORE DISCONNECTING BATTERY

·

When disconnecting and reconnecting the battery.

Click hereGeneral>SETUP>WHEN DISCONNECTING OR RECONNECTING BATTERY TERMINAL>WORK PROCEDURE

HINT:

When disconnecting and reconnecting the battery, there is an automatic learning function that completes learning when the respective system is used.

Click hereGeneral>SETUP>WHEN DISCONNECTING OR RECONNECTING BATTERY TERMINAL>AUTOMATIC LEARNING CHART


·

Some parts must be initialized and set when replacing or removing and installing parts.

Click hereGeneral>SETUP>WHEN REPLACING OR REMOVING/INSTALLING PARTS>WORK PROCEDURE

·

After performing repairs, perform the DTC check procedure and confirm that the DTCs are not output again.

DTC check procedure: Turn the ignition switch to ON and wait for 1 minute or more. Then operate the suspected malfunctioning system and drive the vehicle at 60 km/h (37 mph) or more for 5 minutes or more.

·

After the repair, perform the CAN bus check and check that all the ECUs and sensors connected to the CAN communication system are displayed as normal.

Click herePower Source / Network>NETWORKING>CAN COMMUNICATION SYSTEM>DIAGNOSIS SYSTEM



HINT:
·

Before disconnecting related connectors for inspection, push in on each connector body to check that the connector is not loose or disconnected.

·

When a connector is disconnected, check that the terminals and connector body are not cracked, deformed or corroded.



PROCEDURE

1.CHECK GTS OPERATION
HINT:

Read the GTS operator's manual before use.

Click hereGeneral>INTRODUCTION>HOW TO TROUBLESHOOT ECU CONTROLLED SYSTEMS>GENERAL INFORMATION


a.

Connect the GTS to the DLC3 of another vehicle.


b.

Turn the ignition switch to ON.


c.

Turn the GTS on.


d.

Check that the GTS and ECUs can communicate with the ignition switch ON.


HINT:
·

ECUs and sensors are not displayed on the "Communication Bus Check" screen when the GTS cannot communicate with the vehicle.

·

If communication between the GTS and ECUs is not possible, either the GTS or vehicle has a malfunction.

·

If communication between the GTS and ECUs is still not possible even when the GTS is connected to another vehicle, the GTS has a malfunction. Perform the self tests described in the GTS operator's manual. (The GTS may be malfunctioning or its battery may be discharged.)



Result:
Result Proceed to
OK (Communication between the GTS and the vehicle is not possible, but communication is possible when connected to another vehicle.) A
NG (Communication is not possible between the GTS and the vehicle, or between the GTS and another vehicle.) B



A

2.CONFIRM PROBLEM SYMPTOMS (CONFIRM ERROR ON GTS SCREEN)

B

REFER TO GTS OPERATOR'S MANUAL

2.CONFIRM PROBLEM SYMPTOMS (CONFIRM ERROR ON GTS SCREEN)
a.

Confirm error on the GTS screen.


Result:
Result Proceed to
"A communication error with Engine ECU occurred. Please confirm that Engine ECU is properly installed." is displayed. A
Cannot proceed to vehicle selection screen. B



A

3.CHECK BUS 2 MAIN LINE (CANH - CANL)

B

4.CHECK HARNESS AND CONNECTOR (DLC3 POWER SOURCE CIRCUIT)
3.CHECK BUS 2 MAIN LINE (CANH - CANL)
NOTICE:

Before measuring the resistance of the CAN bus, turn the ignition switch off and leave the vehicle for 1 minute or more without operating the key or any switches, or opening or closing the doors. After that, disconnect the cable from the negative (-) battery terminal and leave the vehicle for 10 minutes or more before measuring the resistance.


HINT:

Operating the ignition switch, any other switches or a door triggers related ECU and sensor communication on the CAN. This communication will cause the resistance value to change.


a.

Disconnect the cable from the negative (-) battery terminal.


b.
C324419C57
1.448,0.25 1.917,0.51 0.469,0.26 1.427,2.365 1.896,2.625 0.469,0.26 2.365,3.604 2.031,4.271 2.031,4.271 1.865,4.271 true 1.656,1.146 1.49,1.76 1.49,1.76 1.323,1.76 true 1.75,1.146 1.948,1.76 1.948,1.76 2.104,1.76 true 1.594,3.146 1.156,2.615 1.156,2.615 0.99,2.615 true 0.063,0.052 0.375,0.25 0.313,0.198 10 false *a 0.115,2.198 0.427,2.396 0.313,0.198 10 false *b 1.552,0.302 2.042,0.552 0.49,0.25 10 false N21 1.573,2.417 2.063,2.667 0.49,0.25 10 false N8 0.917,1.677 1.406,1.927 0.49,0.25 10 false CA4H 1.573,4.188 2.063,4.438 0.49,0.25 10 false BAT 2.146,1.677 2.635,1.927 0.49,0.25 10 false CA4L 0.75,2.542 1.24,2.792 0.49,0.25 10 false CG
*a Component with harness connected
(Central Gateway ECU (Network Gateway ECU))
*b Front view of DLC3


Measure the resistance according to the value(s) in the table below.

Standard Resistance:
Tester Connection Condition Specified Condition Result
N21-18 (CA4H) - N21-17 (CA4L) Cable disconnected from negative (-) battery terminal 54 to 69 Ω Below 54 Ω: Short circuit between bus lines
70 Ω or higher: Open circuit in main bus lines
N21-18 (CA4H) - N8-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher Below 200 Ω: CANH short to ground
N21-17 (CA4L) - N8-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher Below 200 Ω: CANL short to ground
N21-18 (CA4H) - N8-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher Below 6 kΩ: CANH +B short
N21-17 (CA4L) - N8-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher Below 6 kΩ: CANL +B short



Result:
Result Proceed to
OK (CAN bus main lines are normal) A
NG (There is an open or short in a CAN bus main line of a suspected bus) B



A

GO TO SFI SYSTEM
HINT:

Inspect the ECM supply power or VC voltage.



B

GO TO CHECK BUS 2 LINE

Click herePower Source / Network>NETWORKING>CAN COMMUNICATION SYSTEM>Check Bus 2 Line


4.CHECK HARNESS AND CONNECTOR (DLC3 POWER SOURCE CIRCUIT)
NOTICE:

Before measuring the resistance of the CAN bus, turn the ignition switch off and leave the vehicle for 1 minute or more without operating the key or any switches, or opening or closing the doors. After that, disconnect the cable from the negative (-) battery terminal and leave the vehicle for 10 minutes or more before measuring the resistance.


HINT:

Operating the ignition switch, any other switches or a door triggers related ECU and sensor communication on the CAN. This communication will cause the resistance value to change.


a.
C358927C28
1.448,0.219 1.885,0.521 0.438,0.302 2.583,1.719 2.417,1.719 2.417,1.719 2.25,1.302 true 1.01,0.427 1.177,0.427 1.177,0.427 1.604,0.938 true 0.063,0.083 0.375,0.281 0.313,0.198 10 false *a 1.563,0.292 2.01,0.521 0.448,0.229 10 false N8 2.625,1.635 3.042,1.854 0.417,0.219 10 false BAT 0.74,0.354 1.24,0.552 0.5,0.198 10 false CG
*a Front view of DLC3


Measure the voltage according to the value(s) in the table below.

Standard Voltage:
Tester Connection Condition Specified Condition
N8-16 (BAT) - Body ground Always 11 to 14 V


HINT:

If the resistance between CANH and CANL is not as specified, a connector may have been loose or disconnected during inspection. If a connector is loose or disconnected, connect it and perform the inspection again.



b.

Disconnect the cable from the negative (-) battery terminal.


c.

Measure the resistance according to the value(s) in the table below.

Standard Resistance:
Tester Connection Condition Specified Condition
N8-4 (CG) - Body ground Cable disconnected from negative (-) battery terminal Below 1 Ω


HINT:

If the resistance between CANH and CANL is not as specified, a connector may have been loose or disconnected during inspection. If a connector is loose or disconnected, connect it and perform the inspection again.



Result:
Proceed to
OK
NG



OK

5.CHECK FOR OPEN IN CAN BUS WIRE (DLC3 - CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU))

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR (DLC3 - CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU))

5.CHECK FOR OPEN IN CAN BUS WIRE (DLC3 - CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU))
a.
C358927C52
1.448,0.219 1.885,0.521 0.438,0.302 2.406,0.417 2.24,0.417 2.24,0.417 1.99,0.927 true 1.5,1.854 1.667,1.854 1.667,1.854 1.948,1.49 true 0.063,0.083 0.375,0.281 0.313,0.198 10 false *a 1.563,0.292 2.01,0.521 0.448,0.229 10 false N8 2.5,0.344 2.917,0.563 0.417,0.219 10 false CANH 1.135,1.781 1.552,2 0.417,0.219 10 false CANL
*a Front view of DLC3


Measure the resistance according to the value(s) in the table below.

Standard Resistance:
Tester Connection Condition Specified Condition
N8-6 (CANH) - N8-14 (CANL) Cable disconnected from negative (-) battery terminal Below 70 Ω


HINT:

If the resistance between CANH and CANL is not as specified, a connector may have been loose or disconnected during inspection. If a connector is loose or disconnected, connect it and perform the inspection again.



Result:
Proceed to
OK
NG



OK

6.CHECK FOR SHORT IN CAN BUS WIRES (DLC3 - CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU))

NG

8.CHECK FOR OPEN IN CAN BUS WIRE (CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU) - DLC3)
6.CHECK FOR SHORT IN CAN BUS WIRES (DLC3 - CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU))
a.
C358927C30
1.448,0.219 1.885,0.521 0.438,0.302 2.583,1.719 2.417,1.719 2.417,1.719 2.25,1.302 true 1.01,0.427 1.177,0.427 1.177,0.427 1.604,0.938 true 2.406,0.417 2.24,0.417 2.24,0.417 1.99,0.927 true 1.5,1.854 1.667,1.854 1.667,1.854 1.948,1.49 true 0.063,0.083 0.375,0.281 0.313,0.198 10 false *a 1.563,0.292 2.01,0.521 0.448,0.229 10 false N8 2.625,1.635 3.042,1.854 0.417,0.219 10 false BAT 0.74,0.354 1.24,0.552 0.5,0.198 10 false CG 2.5,0.344 2.917,0.563 0.417,0.219 10 false CANH 1.135,1.781 1.552,2 0.417,0.219 10 false CANL
*a Front view of DLC3


Measure the resistance according to the value(s) in the table below.

Standard Resistance:
Tester Connection Condition Specified Condition
N8-6 (CANH) - N8-14 (CANL) Cable disconnected from negative (-) battery terminal 54 Ω or higher
N8-6 (CANH) - N8-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher
N8-14 (CANL) - N8-4 (CG)
N8-6 (CANH) - N8-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher
N8-14 (CANL) - N8-16 (BAT)


HINT:

If the resistance between CANH and CANL is not as specified, a connector may have been loose or disconnected during inspection. If a connector is loose or disconnected, connect it and perform the inspection again.



Result:
Proceed to
OK
NG



OK

7.CHECK HARNESS AND CONNECTOR (POWER SOURCE CIRCUIT)

NG

9.CHECK FOR SHORT IN CAN BUS WIRES (CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU) - DLC3)
7.CHECK HARNESS AND CONNECTOR (POWER SOURCE CIRCUIT)
a.

Reconnect the cable to the negative (-) battery terminal.


b.

Disconnect the central gateway ECU (network gateway ECU) connector.


c.
C369148C31
1.5,0.333 1.917,0.583 0.417,0.25 0.563,0.594 0.729,0.594 0.729,0.594 0.813,1.094 true 0.604,0.25 0.771,0.25 0.771,0.25 0.938,1.083 true 0.573,1.625 0.74,1.625 0.74,1.625 0.854,1.292 true 1.24,1.875 1.042,1.875 1.042,1.875 0.99,1.292 true 2.844,0.615 2.646,0.615 2.646,0.615 2.594,1.104 true 0.094,0.073 0.406,0.271 0.313,0.198 10 false *a 1.594,0.385 1.906,0.583 0.313,0.198 10 false N21 0.271,0.521 0.677,0.74 0.406,0.219 10 false BAT 0.313,0.198 0.719,0.417 0.406,0.219 10 false ACC 0.333,1.542 0.74,1.76 0.406,0.219 10 false IG1 1.292,1.792 1.698,2.01 0.406,0.219 10 false IG2 2.896,0.542 3.302,0.76 0.406,0.219 10 false GND
*a Front view of wire harness connector
(to Central Gateway ECU (Network Gateway ECU))


Measure the resistance according to the value(s) in the table below.

Standard Resistance:
Tester Connection Condition Specified Condition
N21-10 (GND) - Body ground Cable disconnected from negative (-) battery terminal Below 1 Ω



d.

Measure the voltage according to the value(s) in the table below.

Standard Voltage:
Tester Connection Condition Specified Condition

*1: w/o Stop and Start ECU

*2: w/ Stop and Start ECU

N21-1 (BAT) - Body ground Always 11 to 14 V
N21-2 (ACC) - Body ground Ignition switch ACC 11 to 14 V
Ignition switch off Below 1 V
N21-11 (IG1) - Body ground Ignition switch ON 11 to 14 V*1
10.5 to 16 V*2
Ignition switch off Below 1 V
N21-12 (IG2) - Body ground Ignition switch ON 11 to 14 V
Ignition switch off Below 1 V



Result:
Result Proceed to
OK A
NG (IG1 terminal) (w/ Stop and Start System) B
NG (Except IG1 terminal) (w/ Stop and Start System) C
NG (w/o Stop and Start System)



A

REPLACE CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU)

Click herePower Source / Network>NETWORKING>NETWORK GATEWAY ECU>REMOVAL


B

GO TO STOP AND START SYSTEM

Click hereEngine / Hybrid System>STOP AND START>STOP AND START SYSTEM>Backup Boost Converter Circuit


C

REPAIR OR REPLACE HARNESS OR CONNECTOR

8.CHECK FOR OPEN IN CAN BUS WIRE (CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU) - DLC3)
a.

Disconnect the N21 central gateway ECU (network gateway ECU) connector.


b.

Measure the resistance according to the value(s) in the table below.

Standard Resistance:
Tester Connection Condition Specified Condition
N21-14 (CA6H) - N8-6 (CANH) Cable disconnected from negative (-) battery terminal Below 1 Ω
N21-5 (CA6L) - N8-14 (CANL)



Result:
Proceed to
OK
NG



OK

REPLACE CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU)

Click herePower Source / Network>NETWORKING>NETWORK GATEWAY ECU>REMOVAL


NG

REPAIR OR REPLACE HARNESS OR CONNECTOR (CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU) - DLC3)

9.CHECK FOR SHORT IN CAN BUS WIRES (CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU) - DLC3)
a.

Disconnect the central gateway ECU (network gateway ECU) connector.


b.
C300856
1.542,2.781 1.958,3.052 0.417,0.271 1.396,0.208 1.813,0.479 0.417,0.271 0.885,2.104 1,2.104 1,2.104 1.375,1.24 true 1.781,4.427 1.906,4.427 1.906,4.427 2.344,3.958 true 0.719,1.854 0.833,1.854 0.833,1.854 1.271,1.031 true 1.073,2.646 1.188,2.646 1.188,2.646 1.625,3.406 true 0.146,0.104 0.458,0.26 0.313,0.156 10 false *a 0.198,2.635 0.51,2.792 0.313,0.156 10 false *b 1.656,2.844 1.938,3.01 0.281,0.167 10 false N8 1.49,0.271 1.99,0.51 0.5,0.24 10 false N21 0.344,1.76 0.823,1.99 0.479,0.229 10 false CA6L 0.479,2.021 0.979,2.219 0.5,0.198 10 false CA6H 1.469,4.365 1.896,4.521 0.427,0.156 10 false BAT 0.813,2.573 1.24,2.729 0.427,0.156 10 false CG
*a Front view of wire harness connector
(to Central Gateway ECU (Network Gateway ECU))
*b Front view of DLC3


Measure the resistance according to the value(s) in the table below.

Standard Resistance:
Tester Connection Condition Specified Condition
N21-14 (CA6H) - N21-5 (CA6L) Cable disconnected from negative (-) battery terminal 1 MΩ or higher
N21-14 (CA6H) - N8-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher
N21-5 (CA6L) - N8-4 (CG)
N21-14 (CA6H) - N8-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher
N21-5 (CA6L) - N8-16 (BAT)



Result:
Proceed to
OK
NG



OK

REPLACE CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU)

Click herePower Source / Network>NETWORKING>NETWORK GATEWAY ECU>REMOVAL


NG

REPAIR OR REPLACE HARNESS OR CONNECTOR (CENTRAL GATEWAY ECU [NETWORK GATEWAY ECU] - DLC3)