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 4 Lines for Short Circuit  


DESCRIPTION

There may be a short circuit between the CAN main bus lines and/or CAN branch lines when the resistance between terminals 22 (CA2H) and 7 (CA2L) of the central gateway ECU (network gateway ECU) is below 54 Ω.

Symptom Trouble Area
Resistance between terminals 22 (CA2H) and 7 (CA2L) of the central gateway ECU (network gateway ECU) is below 54 Ω.
·

Short in CAN main bus lines

·

Short in CAN branch lines

·

Central gateway ECU (network gateway ECU)

·

Tire pressure warning ECU and receiver

·

Power steering ECU with motor assembly

·

Brake actuator assembly

·

Steering sensor

·

Airbag sensor with ECU assembly

·

No. 5 CAN junction connector



WIRING DIAGRAM

C416222E07
0.073,6.031 0.531,6.229 0.458,0.198 10 false I47 0.333,6.042 2.688,6.385 2.354,0.344 10 false Airbag Sensor with ECU Assembly 0.396,5.375 0.854,5.573 0.458,0.198 10 false 120 Ω 6.656,0.74 7.115,0.938 0.458,0.198 10 false 120 Ω 1.271,0.365 1.729,0.563 0.458,0.198 10 false 3 1.271,0.823 1.729,1.021 0.458,0.198 10 false 8 0.948,5.51 1.406,5.708 0.458,0.198 10 false CANL 1.406,5.031 1.865,5.229 0.458,0.198 10 false 26 1.427,5.5 1.885,5.698 0.458,0.198 10 false 27 3.146,5.479 3.604,5.677 0.458,0.198 10 false 9 3.146,5.01 3.604,5.208 0.458,0.198 10 false 3 4.198,3.083 4.656,3.281 0.458,0.198 10 false 12 4.229,2.604 4.688,2.802 0.458,0.198 10 false 6 4.229,0.833 4.688,1.031 0.458,0.198 10 false 8 4.219,0.333 4.677,0.531 0.458,0.198 10 false 2 3.156,0.333 3.615,0.531 0.458,0.198 10 false 1 3.167,0.844 3.625,1.042 0.458,0.198 10 false 7 5.802,0.375 6.26,0.573 0.458,0.198 10 false 22 5.875,0.844 6.333,1.042 0.458,0.198 10 false 7 6.083,0.365 6.542,0.563 0.458,0.198 10 false CA2H 6.073,0.844 6.531,1.042 0.458,0.198 10 false CA2L 0.156,3.635 0.688,3.844 0.531,0.208 10 false O18 0.469,3.635 1.865,4.271 1.396,0.635 10 false Tire Pressure Warning ECU and Receiver 5.448,3.646 7.083,4.229 1.635,0.583 10 false Brake Actuator Assembly 5.146,3.646 5.604,3.844 0.458,0.198 10 false A51 6.083,2.729 6.542,2.927 0.458,0.198 10 false CANH 6.083,3.198 6.542,3.396 0.458,0.198 10 false CANL 2.833,6.021 4.948,6.385 2.115,0.365 10 false No. 5 CAN Junction Connector 5.844,5 6.302,5.198 0.458,0.198 10 false 7 5.844,5.479 6.302,5.677 0.458,0.198 10 false 8 5.573,6.031 7.135,6.823 1.563,0.792 10 false Power Steering ECU with Motor Assembly 5.333,6.031 5.792,6.229 0.458,0.198 10 false I21 2.583,6.021 3.042,6.219 0.458,0.198 10 false I96 4.219,5.5 4.677,5.698 0.458,0.198 10 false 11 4.229,5 4.688,5.198 0.458,0.198 10 false 5 5.208,1.385 7.135,2.156 1.927,0.771 10 false Central Gateway ECU (Network Gateway ECU) 4.938,1.385 5.396,1.583 0.458,0.198 10 false I53 0.302,1.396 1.698,1.99 1.396,0.594 10 false Steering Sensor 0.052,1.385 0.51,1.583 0.458,0.198 10 false I46 3.146,2.594 3.604,2.792 0.458,0.198 10 false 4 3.083,3.083 3.542,3.281 0.458,0.198 10 false 10 0.75,2.708 1.208,2.906 0.458,0.198 10 false CANH 0.771,3.198 1.229,3.396 0.458,0.198 10 false CANL 1.313,2.604 1.771,2.802 0.458,0.198 10 false 9 1.271,3.063 1.729,3.26 0.458,0.198 10 false 10 6.104,5.615 6.563,5.813 0.458,0.198 10 false CANL 6.083,5.125 6.542,5.323 0.458,0.198 10 false CANH 0.76,0.479 1.219,0.677 0.458,0.198 10 false CANH 0.781,0.948 1.24,1.146 0.458,0.198 10 false CANL 5.875,2.594 6.333,2.792 0.458,0.198 10 false 5 5.813,3.073 6.271,3.271 0.458,0.198 10 false 19 0.917,5.031 1.375,5.229 0.458,0.198 10 false CANH

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 IN CAN BUS LINES (NO. 5 CAN JUNCTION CONNECTOR)
a.

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


b.

Disconnect the I96 No. 5 CAN junction connector.


c.

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

C402515C24
1.26,1.313 1.677,1.615 0.417,0.302 2.688,1.365 2.688,0.781 2.688,0.781 2.521,0.781 true 3.042,1.354 3.042,0.531 3.042,0.531 2.875,0.531 true 3.406,1.365 3.406,0.281 3.406,0.281 3.24,0.281 true 4.104,1.365 4.104,0.542 4.104,0.542 4.271,0.542 true 2.677,1.615 2.677,2.021 2.677,2.021 2.51,2.021 true 3.042,1.604 3.042,2.26 3.042,2.26 2.875,2.26 true 3.396,1.604 3.396,2.542 3.396,2.542 3.229,2.542 true 4.104,1.604 4.104,2.25 4.104,2.25 4.271,2.25 true 3.75,1.354 3.75,0.271 3.75,0.271 3.917,0.271 true 3.75,1.615 3.75,2.51 3.75,2.51 3.917,2.51 true 4.448,1.354 4.448,0.771 4.448,0.771 4.615,0.771 true 4.458,1.615 4.458,2.021 4.458,2.021 4.625,2.021 true 0.115,0.063 0.427,0.26 0.313,0.198 10 false *a 1.375,1.385 1.885,1.656 0.51,0.271 10 false I96 1.927,0.708 2.583,0.99 0.656,0.281 10 false CANH*b 2.271,0.458 2.927,0.74 0.656,0.281 10 false CANH*c 2.646,0.208 3.302,0.49 0.656,0.281 10 false CANH*d 4.333,0.49 5.104,0.833 0.771,0.344 10 false CANH*f 1.938,1.948 2.594,2.229 0.656,0.281 10 false CANL*b 2.302,2.177 2.958,2.458 0.656,0.281 10 false CANL*c 2.656,2.469 3.313,2.75 0.656,0.281 10 false CANL*d 4.385,2.167 5.042,2.448 0.656,0.281 10 false CANL*f 4,2.417 4.656,2.698 0.656,0.281 10 false CANL*e 4.01,0.198 4.667,0.479 0.656,0.281 10 false CANH*e 4.688,1.948 5.344,2.229 0.656,0.281 10 false CANL*g 4.688,0.698 5.458,1.042 0.771,0.344 10 false CANH*g
*a Front view of wire harness connector
(to No. 5 CAN Junction Connector) 		*b to Steering Sensor
*c to Central Gateway ECU (Network Gateway ECU) *d to Airbag Sensor with ECU Assembly
*e to Tire Pressure Warning ECU and Receiver *f to Power Steering ECU with Motor Assembly
*g to Brake Actuator Assembly - -


Standard Resistance:
Tester Connection Condition Specified Condition Connected to
I96-1 (CANH) - I96-7 (CANL) Cable disconnected from negative (-) battery terminal 200 Ω or higher Steering sensor
I96-2 (CANH) - I96-8 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω Central gateway ECU (network gateway ECU)
I96-3 (CANH) - I96-9 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω Airbag sensor with ECU assembly
I96-4 (CANH) - I96-10 (CANL) Cable disconnected from negative (-) battery terminal 200 Ω or higher Tire pressure warning ECU and receiver
I96-5 (CANH) - I96-11 (CANL) Cable disconnected from negative (-) battery terminal 200 Ω or higher Power steering ECU with motor assembly
I96-6 (CANH) - I96-12 (CANL) Cable disconnected from negative (-) battery terminal 200 Ω or higher Brake actuator assembly



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



A

REPLACE NO. 5 CAN JUNCTION CONNECTOR

B

2.CHECK FOR SHORT IN CAN BUS LINES (NO. 5 CAN JUNCTION CONNECTOR - CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU))

C

3.CHECK FOR SHORT IN CAN BUS LINES (NO. 5 CAN JUNCTION CONNECTOR - AIRBAG SENSOR WITH ECU ASSEMBLY)

D

4.CHECK FOR SHORT IN CAN BUS LINES (ECU OR SENSOR)
2.CHECK FOR SHORT IN CAN BUS LINES (NO. 5 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.

C402515C29
1.26,1.313 1.677,1.615 0.417,0.302 3.042,1.354 3.042,0.563 3.042,0.563 2.875,0.563 true 3.042,1.615 3.042,2.26 3.042,2.26 2.875,2.26 true 0.115,0.063 0.427,0.26 0.313,0.198 10 false *a 1.385,1.375 1.896,1.646 0.51,0.271 10 false I96 2.302,0.49 2.958,0.771 0.656,0.281 10 false CANH*b 2.292,2.167 2.948,2.448 0.656,0.281 10 false CANL*b
*a Front view of wire harness connector
(to No. 5 CAN Junction Connector) 		*b to Central Gateway ECU (Network Gateway ECU)


Standard Resistance:
Tester Connection Condition Specified Condition
I96-2 (CANH) - I96-8 (CANL) Cable disconnected from negative (-) battery terminal 1 MΩ or higher



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 LINES OR CONNECTOR (NO. 5 CAN JUNCTION CONNECTOR - CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU))

3.CHECK FOR SHORT IN CAN BUS LINES (NO. 5 CAN JUNCTION CONNECTOR - AIRBAG SENSOR WITH ECU ASSEMBLY)
a.

Disconnect the I47 airbag sensor with ECU assembly connector.


b.

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

C402515C30
1.26,1.313 1.677,1.615 0.417,0.302 3.396,1.354 3.396,0.563 3.396,0.563 3.229,0.563 true 3.396,1.615 3.396,2.26 3.396,2.26 3.229,2.26 true 0.115,0.063 0.427,0.26 0.313,0.198 10 false *a 1.385,1.375 1.896,1.646 0.51,0.271 10 false I96 2.656,0.49 3.313,0.771 0.656,0.281 10 false CANH*b 2.688,2.167 3.344,2.448 0.656,0.281 10 false CANL*b
*a Front view of wire harness connector
(to No. 5 CAN Junction Connector) 		*b to Airbag Sensor with ECU Assembly


Standard Resistance:
Tester Connection Condition Specified Condition
I96-3 (CANH) - I96-9 (CANL) Cable disconnected from negative (-) battery terminal 1 MΩ or higher



Result:
Result
OK
NG



OK

REPLACE AIRBAG SENSOR WITH ECU ASSEMBLY

Click hereVehicle Interior>SUPPLEMENTAL RESTRAINT SYSTEMS>CENTER AIRBAG SENSOR ASSEMBLY>REMOVAL


NG

REPAIR OR REPLACE CAN MAIN BUS LINES OR CONNECTOR (NO. 5 CAN JUNCTION CONNECTOR - AIRBAG SENSOR WITH ECU ASSEMBLY)

4.CHECK FOR SHORT IN CAN BUS LINES (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 short circuited branch line is connected.

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


c.
C409557C07
1.5,0.083 1.885,0.313 0.385,0.229 1.146,0.469 1.313,0.469 1.313,0.469 1.313,0.969 true 1.167,1.719 1.333,1.719 1.333,1.719 1.333,1.135 true 0.115,0.094 0.427,0.292 0.313,0.198 10 false *a 1.604,0.115 2.042,0.365 0.438,0.25 10 false I53 0.75,0.396 1.188,0.646 0.438,0.25 10 false CA2L 0.76,1.646 1.198,1.896 0.438,0.25 10 false CA2H
*a Component with harness connected
(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
I53-22 (CA2H) - I53-7 (CA2L) Cable disconnected from negative (-) battery terminal 54 to 69 Ω


HINT:
·

If the resistance becomes normal (between 54 and 69 Ω) 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 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