RM3660EC _57 Power Source / Network _080743 NETWORKING _0598517 CAN COMMUNICATION SYSTEM(for Gasoline Model (NR Series)) J

NETWORKING  CAN COMMUNICATION SYSTEM(for Gasoline Model (NR Series))  Check Bus 1 Line for Short to +B  


DESCRIPTION

There may be a short circuit between one of the CAN bus lines and +B when there is no resistance between terminal 23 (CA1H) of the central gateway ECU (network gateway ECU) and terminal 16 (BAT) of the DLC3, or terminal 8 (CA1L) of the central gateway ECU (network gateway ECU) and terminal 16 (BAT) of the DLC3.

Symptom Trouble Area
There is no resistance between terminal 23 (CA1H) of the central gateway ECU (network gateway ECU) and terminal 16 (BAT) of the DLC3, or terminal 8 (CA1L) of the central gateway ECU (network gateway ECU) and terminal 16 (BAT) of the DLC3.
·

Short to +B in CAN main bus line

·

Short to +B in CAN branch line

·

Central gateway ECU (network gateway ECU)

·

Millimeter wave radar sensor assembly

·

Forward recognition camera

·

No. 1 CAN junction connector



WIRING DIAGRAM

C506212E01
0.115,6.323 0.573,6.521 0.458,0.198 10 false I53 0.354,6.323 2.281,7.094 1.927,0.771 10 false Central Gateway ECU (Network Gateway ECU) 0.396,5.729 0.854,5.927 0.458,0.198 10 false 120 Ω 0.365,1.063 0.823,1.26 0.458,0.198 10 false 120 Ω 0.938,0.74 1.396,0.938 0.458,0.198 10 false CA1H 0.969,1.219 1.427,1.417 0.458,0.198 10 false CA1L 1.427,0.729 1.885,0.927 0.458,0.198 10 false 23 1.458,1.208 1.917,1.406 0.458,0.198 10 false 8 0.906,5.365 1.365,5.563 0.458,0.198 10 false CAXH 0.948,5.865 1.406,6.063 0.458,0.198 10 false CAXL 1.406,5.354 1.865,5.552 0.458,0.198 10 false 9 1.417,5.865 1.875,6.063 0.458,0.198 10 false 24 3.094,5.844 3.552,6.042 0.458,0.198 10 false 17 3.146,5.365 3.604,5.563 0.458,0.198 10 false 6 4.198,3.438 4.656,3.635 0.458,0.198 10 false 15 4.24,2.948 4.698,3.146 0.458,0.198 10 false 4 3.156,0.719 3.615,0.917 0.458,0.198 10 false 1 3.104,1.177 3.563,1.375 0.458,0.198 10 false 12 5.719,3.99 7.125,4.656 1.406,0.667 10 false Millimeter Wave Radar Sensor Assembly 5.479,3.99 5.938,4.188 0.458,0.198 10 false A1 6.083,3.063 6.542,3.26 0.458,0.198 10 false CA2H 6.083,3.531 6.542,3.729 0.458,0.198 10 false CA2L 5.865,2.969 6.323,3.167 0.458,0.198 10 false 3 5.865,3.448 6.323,3.646 0.458,0.198 10 false 2 3.271,6.406 4.521,7.271 1.25,0.865 10 false No. 1 CAN Junction Connector 6.104,5.49 6.563,5.688 0.458,0.198 10 false CA1P 6.094,5.969 6.552,6.167 0.458,0.198 10 false CA1N 5.865,5.365 6.323,5.563 0.458,0.198 10 false 5 5.813,5.844 6.271,6.042 0.458,0.198 10 false 11 5.823,6.396 7.094,7.063 1.271,0.667 10 false Forward Recognition Camera 5.583,6.396 6.042,6.594 0.458,0.198 10 false T9 2.958,6.406 3.417,6.604 0.458,0.198 10 false I172 4.219,5.844 4.677,6.042 0.458,0.198 10 false 16 4.26,5.354 4.719,5.552 0.458,0.198 10 false 5

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 (for Gasoline Model (NR Series))>HOW TO PROCEED WITH TROUBLESHOOTING

·

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 (-) auxiliary battery terminal.

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

·

When disconnecting and reconnecting the battery.

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 (for Gasoline Model (NR Series))>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 FOR SHORT TO +B IN CAN BUS LINE (NO. 1 CAN JUNCTION CONNECTOR)
a.

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


b.

Disconnect the I172 No. 1 CAN junction connector.


c.

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

C416672C85
3.656,1.333 4.135,1.594 0.479,0.26 0.271,1.375 0.708,1.604 0.438,0.229 1.031,0.677 1.198,0.677 1.198,0.677 1.198,1.427 true 1.042,2.24 1.208,2.24 1.208,2.24 1.208,1.74 true 2.208,0.677 2.042,0.677 2.042,0.677 2.042,1.427 true 2.208,2.25 2.042,2.25 2.042,2.25 2.042,1.75 true 2.042,2.49 1.875,2.49 1.875,2.49 1.875,1.74 true 2.031,0.427 1.865,0.427 1.865,0.427 1.865,1.427 true 6.104,2.135 5.938,2.135 5.938,2.135 5.938,1.719 true 1.865,0.25 1.698,0.25 1.698,0.25 1.698,1.417 true 1.875,2.667 1.708,2.667 1.708,2.667 1.708,1.75 true 0.24,0.167 0.552,0.365 0.313,0.198 10 false *a 3.719,0.188 4.031,0.385 0.313,0.198 10 false *1 3.823,1.365 4.427,1.792 0.604,0.427 10 false I26 0.385,1.406 0.875,1.677 0.49,0.271 10 false I172 0.469,0.604 1.104,0.844 0.635,0.24 10 false CANH*b 0.5,2.156 1.135,2.396 0.635,0.24 10 false CANL*b 1.948,2.594 2.583,2.771 0.635,0.177 10 false CANL*c 1.948,0.177 2.583,0.417 0.635,0.24 10 false CANH*c 6.177,2.063 6.552,2.26 0.375,0.198 10 false BAT 2.094,0.354 2.729,0.594 0.635,0.24 10 false CANH*d 2.281,0.594 2.917,0.833 0.635,0.24 10 false CANH*b 2.104,2.406 2.771,2.635 0.667,0.229 10 false CANL*d 2.26,2.167 2.927,2.417 0.667,0.25 10 false CANL*b
*1 DLC3 - -
*a Front view of wire harness connector
(to No. 1 CAN Junction Connector) 		*b to Central Gateway ECU (Network Gateway ECU)
*c to Millimeter Wave Radar Sensor Assembly *d to Forward Recognition Camera
*e - -


Standard Resistance:
Tester Connection Condition Specified Condition Connected to
I172-1 (CANH) - I26-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher Central gateway ECU (network gateway ECU)
I172-12 (CANL) - I26-16 (BAT)
I172-4 (CANH) - I26-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher Millimeter wave radar sensor assembly
I172-15 (CANL) - I26-16 (BAT)
I172-5 (CANH) - I26-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher Forward recognition camera
I172-16 (CANL) - I26-16 (BAT)
I172-6 (CANH) - I26-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher Central gateway ECU (network gateway ECU)
I172-17 (CANL) - I26-16 (BAT)



Result:
Result Proceed to
OK A
NG (Line to central gateway ECU (network gateway ECU)) B
NG (Line to ECU or sensor) C



A

REPLACE NO. 1 CAN JUNCTION CONNECTOR

B

2.CHECK FOR SHORT TO +B IN CAN BUS LINE (NO. 1 CAN JUNCTION CONNECTOR - CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU))

C

3.CHECK FOR SHORT TO +B IN CAN BUS LINE (ECU OR SENSOR)
2.CHECK FOR SHORT TO +B IN CAN BUS LINE (NO. 1 CAN JUNCTION CONNECTOR - CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU))
a.

Disconnect the I53 central gateway ECU (network gateway ECU) connector.


b.

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

C416672C44
3.656,1.333 4.135,1.594 0.479,0.26 0.271,1.375 0.708,1.604 0.438,0.229 1.031,0.677 1.198,0.677 1.198,0.677 1.198,1.427 true 1.052,2.24 1.219,2.24 1.219,2.24 1.219,1.74 true 2.198,0.677 2.031,0.677 2.031,0.677 2.031,1.427 true 2.208,2.25 2.042,2.25 2.042,2.25 2.042,1.75 true 6.104,2.135 5.938,2.135 5.938,2.135 5.938,1.719 true 0.24,0.167 0.552,0.365 0.313,0.198 10 false *a 3.719,0.188 4.031,0.385 0.313,0.198 10 false *1 3.823,1.365 4.427,1.792 0.604,0.427 10 false I26 0.385,1.406 0.875,1.677 0.49,0.271 10 false I172 0.469,0.604 1.104,0.844 0.635,0.24 10 false CANH*b 0.51,2.156 1.146,2.396 0.635,0.24 10 false CANL*b 6.177,2.063 6.552,2.26 0.375,0.198 10 false BAT 2.292,0.594 2.927,0.833 0.635,0.24 10 false CANH*b 2.292,2.167 2.958,2.417 0.667,0.25 10 false CANL*b
*1 DLC3 - -
*a Front view of wire harness connector
(to No. 1 CAN Junction Connector) 		*b to Central Gateway ECU (Network Gateway ECU)


Standard Resistance:
Tester Connection Condition Specified Condition
I172-1 (CANH) - I26-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher
I172-12 (CANL) - I26-16 (BAT)
I172-6 (CANH) - I26-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher
I172-17 (CANL) - I26-16 (BAT)



Result:
Result
OK
NG



OK

REPLACE CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU)

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


NG

REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (NO. 1 CAN JUNCTION CONNECTOR - CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU))

3.CHECK FOR SHORT TO +B IN CAN BUS LINE (ECU OR SENSOR)
a.

Reconnect all wire harness connectors.


b.

Disconnect the connector that includes terminals CANH and CANL from the ECU or sensor to which the bus line shorted to +B is connected.

Click herePower Source / Network>NETWORKING>CAN COMMUNICATION SYSTEM (for Gasoline Model (NR Series))>TERMINALS OF ECU


c.

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

C410737C39
1.594,0.198 2.01,0.469 0.417,0.271 4.938,0.302 5.406,0.583 0.469,0.281 1.313,1.24 1.313,0.635 1.313,0.635 1.177,0.635 true 1.115,2.083 1.25,2.083 1.25,2.083 1.25,1.385 true 6.021,2.156 5.854,2.156 5.854,2.156 5.854,1.677 true 3.958,0.354 4.271,0.552 0.313,0.198 10 false *1 1.719,0.25 2.031,0.448 0.313,0.198 10 false I53 0.781,0.573 1.333,0.771 0.552,0.198 10 false CA1L 6.135,2.083 6.688,2.281 0.552,0.198 10 false BAT 0.698,2.01 1.25,2.208 0.552,0.198 10 false CA1H 5.083,0.354 5.625,0.656 0.542,0.302 10 false I26 0.094,0.063 0.406,0.26 0.313,0.198 10 false *a
*1 DLC3 - -
*a Component with harness connected
(Central Gateway ECU (Network Gateway ECU)) 		- -


Standard Resistance:
Tester Connection Condition Specified Condition
I53-23 (CA1H) - I26-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher
I53-8 (CA1L) - I26-16 (BAT)


HINT:
·

If the resistance changes to 6 kΩ or higher when the connector is disconnected from the ECU or sensor, there may be a short in the ECU or sensor.

·

If the resistance does not become normal when the connector is disconnected from the ECU or sensor, check for a short to +B in the wire harness and repair or replace the wire harness or connector if necessary.




Result:
Result
OK
NG



OK

REPLACE ECU OR SENSOR

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR