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 5 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 15 (CA5H) and 16 (CA5L) of the central gateway ECU (network gateway ECU) is below 54 Ω.

Symptom Trouble Area
Resistance between terminals 15 (CA5H) and 16 (CA5L) 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)

·

Air conditioning amplifier assembly

·

Certification ECU (smart key ECU assembly)

·

Main body ECU (multiplex network body ECU)

·

Combination meter assembly

·

No. 3 CAN junction connector



WIRING DIAGRAM

C506214E02
0.104,6.031 0.563,6.229 0.458,0.198 10 false I4 0.292,6.031 1.49,6.688 1.198,0.656 10 false Combination Meter Assembly 0.396,5.375 0.854,5.573 0.458,0.198 10 false 120 Ω 6.656,0.729 7.115,0.927 0.458,0.198 10 false 120 Ω 1.26,0.385 1.719,0.583 0.458,0.198 10 false 1 1.271,0.844 1.729,1.042 0.458,0.198 10 false 2 0.906,5.01 1.365,5.208 0.458,0.198 10 false CANH 0.948,5.51 1.406,5.708 0.458,0.198 10 false CANL 3.094,5.49 3.552,5.688 0.458,0.198 10 false 13 3.146,5 3.604,5.198 0.458,0.198 10 false 2 4.198,0.854 4.656,1.052 0.458,0.198 10 false 18 4.229,0.365 4.688,0.563 0.458,0.198 10 false 7 3.156,0.365 3.615,0.563 0.458,0.198 10 false 6 3.094,0.833 3.552,1.031 0.458,0.198 10 false 17 5.802,0.375 6.26,0.573 0.458,0.198 10 false 15 5.813,0.833 6.271,1.031 0.458,0.198 10 false 16 6.083,0.375 6.542,0.573 0.458,0.198 10 false CA5H 6.083,0.844 6.542,1.042 0.458,0.198 10 false CA5L 0.135,3.625 0.594,3.823 0.458,0.198 10 false I49*1 0.531,3.625 2.094,4.24 1.563,0.615 10 false Air Conditioning Amplifier Assembly 3.271,6.021 4.521,6.885 1.25,0.865 10 false No. 3 CAN Junction Connector 6.104,5.125 6.563,5.323 0.458,0.198 10 false CANH 6.094,5.594 6.552,5.792 0.458,0.198 10 false CANL 5.854,5 6.313,5.198 0.458,0.198 10 false 5 5.865,5.479 6.323,5.677 0.458,0.198 10 false 4 5.469,6.042 7.125,6.76 1.656,0.719 10 false Main Body ECU (Multiplex Network Body ECU) 5.188,6.042 5.646,6.24 0.458,0.198 10 false I85 2.969,6.021 3.427,6.219 0.458,0.198 10 false I125 4.208,5.49 4.667,5.688 0.458,0.198 10 false 14 4.229,5.021 4.688,5.219 0.458,0.198 10 false 3 5.198,1.385 7.125,2.156 1.927,0.771 10 false Central Gateway ECU (Network Gateway ECU) 4.948,1.385 5.406,1.583 0.458,0.198 10 false I53 0.24,1.375 3.323,1.896 3.083,0.521 10 false Certification ECU (Smart Key ECU Assembly) 0.063,1.375 0.521,1.573 0.458,0.198 10 false I1 3.156,2.604 3.615,2.802 0.458,0.198 10 false 5 3.104,3.083 3.563,3.281 0.458,0.198 10 false 16 0.75,2.729 1.208,2.927 0.458,0.198 10 false CANH 0.771,3.208 1.229,3.406 0.458,0.198 10 false CANL 1.271,2.604 1.729,2.802 0.458,0.198 10 false 9*2 1.26,3.083 1.719,3.281 0.458,0.198 10 false 26*2 0.75,0.49 1.208,0.688 0.458,0.198 10 false CANH 0.771,0.958 1.229,1.156 0.458,0.198 10 false CANL 0.073,3.802 0.531,4 0.458,0.198 10 false I162*2 1.271,2.448 1.729,2.646 0.458,0.198 10 false 2*1 1.323,2.927 1.781,3.125 0.458,0.198 10 false 1*1 2.104,6.719 6.51,7.083 4.406,0.365 10 false *1: for Manual Air Conditioning System for Electrical Control Type 2.115,7.219 6.271,7.542 4.156,0.323 10 false *2: for Manual Air Conditioning System for Mechanical Control Type 1.49,5 1.948,5.198 0.458,0.198 10 false 9 1.427,5.49 1.885,5.688 0.458,0.198 10 false 25

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

·

Before replacing the main body ECU (multiplex network body ECU) or certification ECU (smart key ECU assembly), refer to Service Bulletin.



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. 3 CAN JUNCTION CONNECTOR)
a.

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


b.

Disconnect the I125 No. 3 CAN junction connector.


c.

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

C416561C74
0.854,1.323 1.333,1.583 0.479,0.26 3.75,1.333 3.75,0.573 3.75,0.573 3.917,0.573 true 3.573,1.333 3.573,0.417 3.573,0.417 3.74,0.417 true 2.917,1.667 2.917,2.083 2.917,2.083 2.75,2.083 true 3.583,1.646 3.583,2.396 3.583,2.396 3.75,2.396 true 3.417,1.646 3.417,2.563 3.417,2.563 3.583,2.563 true 3.406,1.323 3.406,0.24 3.406,0.24 3.573,0.24 true 3.083,1.323 3.083,0.406 3.083,0.406 2.917,0.406 true 3.083,1.646 3.083,2.229 3.083,2.229 2.917,2.229 true 2.917,1.333 2.917,0.583 2.917,0.583 2.75,0.583 true 3.75,1.646 3.75,2.188 3.75,2.188 3.917,2.188 true 0.188,0.135 0.5,0.333 0.313,0.198 10 false *a 0.969,1.375 1.365,1.583 0.396,0.208 10 false I125 2.354,0.333 2.917,0.583 0.563,0.25 10 false CANH*c 2.385,2.156 2.948,2.344 0.563,0.188 10 false CANL*c 3.646,0.156 4.292,0.406 0.646,0.25 10 false CANH*d 3.667,2.49 4.229,2.74 0.563,0.25 10 false CANL*d 3.813,0.333 4.375,0.583 0.563,0.25 10 false CANH*e 3.802,2.313 4.365,2.5 0.563,0.188 10 false CANL*e 2.198,1.99 2.76,2.177 0.563,0.188 10 false CANL*b 2.167,0.5 2.729,0.75 0.563,0.25 10 false CANH*b 4,0.49 4.563,0.74 0.563,0.25 10 false CANH*f 4,2.094 4.563,2.281 0.563,0.188 10 false CANL*f
*a Front view of wire harness connector
(to No. 3 CAN Junction Connector) 		*b to Combination Meter Assembly
*c to Main Body ECU (Multiplex Network Body ECU) *d to Air Conditioning Amplifier Assembly
*e to Certification ECU (Smart Key ECU Assembly) *f to Central Gateway ECU (Network Gateway ECU)


Standard Resistance:
Tester Connection Condition Specified Condition Connected to
I125-2 (CANH) - I125-13 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω Combination meter assembly
I125-3 (CANH) - I125-14 (CANL) Cable disconnected from negative (-) battery terminal 200 Ω or higher Main body ECU (multiplex network body ECU)
I125-5 (CANH) - I125-16 (CANL) Cable disconnected from negative (-) battery terminal 200 Ω or higher Air conditioning amplifier assembly
I125-6 (CANH) - I125-17 (CANL) Cable disconnected from negative (-) battery terminal 200 Ω or higher Certification ECU (smart key ECU assembly)
I125-7 (CANH) - I125-18 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω Central gateway ECU (network gateway ECU)



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



A

REPLACE NO. 3 CAN JUNCTION CONNECTOR

B

2.CHECK FOR SHORT IN CAN BUS LINES (NO. 3 CAN JUNCTION CONNECTOR - CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU))

C

3.CHECK FOR SHORT IN CAN BUS LINES (NO. 3 CAN JUNCTION CONNECTOR - COMBINATION METER ASSEMBLY)

D

4.CHECK FOR SHORT IN CAN BUS LINES (ECU OR SENSOR)
2.CHECK FOR SHORT IN CAN BUS LINES (NO. 3 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.

C416561C09
0.854,1.323 1.333,1.583 0.479,0.26 3.75,1.333 3.75,0.417 3.75,0.417 3.917,0.417 true 3.75,1.677 3.75,2.302 3.75,2.302 3.917,2.302 true 0.188,0.135 0.5,0.333 0.313,0.198 10 false *a 0.979,1.375 1.375,1.583 0.396,0.208 10 false I125 4.01,0.344 4.573,0.594 0.563,0.25 10 false CANH*b 4,2.229 4.563,2.479 0.563,0.25 10 false CANL*b
*a Front view of wire harness connector
(to No. 3 CAN Junction Connector) 		*b to Central Gateway ECU (Network Gateway ECU)


Standard Resistance:
Tester Connection Condition Specified Condition
I125-7 (CANH) - I125-18 (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. 3 CAN JUNCTION CONNECTOR - CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU))

3.CHECK FOR SHORT IN CAN BUS LINES (NO. 3 CAN JUNCTION CONNECTOR - COMBINATION METER ASSEMBLY)
a.

Disconnect the I4 combination meter assembly connector.


b.

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

C416561C10
0.854,1.323 1.333,1.583 0.479,0.26 2.917,1.333 2.917,0.417 2.917,0.417 2.75,0.417 true 2.917,1.667 2.917,2.292 2.917,2.292 2.75,2.292 true 0.188,0.135 0.5,0.333 0.313,0.198 10 false *a 0.979,1.375 1.375,1.583 0.396,0.208 10 false I125 2.177,2.219 2.74,2.406 0.563,0.188 10 false CANL*b 2.177,0.344 2.74,0.594 0.563,0.25 10 false CANH*b
*a Front view of wire harness connector
(to No. 3 CAN Junction Connector) 		*b to Combination Meter Assembly


Standard Resistance:
Tester Connection Condition Specified Condition
I125-2 (CANH) - I125-13 (CANL) Cable disconnected from negative (-) battery terminal 1 MΩ or higher



Result:
Result
OK
NG



OK

REPLACE COMBINATION METER ASSEMBLY

Click hereVehicle Interior>METER / GAUGE / DISPLAY>COMBINATION METER>REMOVAL


NG

REPAIR OR REPLACE CAN MAIN BUS LINES OR CONNECTOR (NO. 3 CAN JUNCTION CONNECTOR - COMBINATION METER 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.
C409557C08
1.49,0.094 1.917,0.313 0.427,0.219 1.667,0.49 1.833,0.49 1.833,0.49 1.833,1.073 true 2.083,0.49 1.917,0.49 1.917,0.49 1.917,1.073 true 0.115,0.094 0.427,0.292 0.313,0.198 10 false *a 1.615,0.125 2.052,0.375 0.438,0.25 10 false I53 1.281,0.417 1.719,0.667 0.438,0.25 10 false CA5L 2.188,0.406 2.625,0.656 0.438,0.25 10 false CA5H
*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
I53-15 (CA5H) - I53-16 (CA5L) 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