RM38T0EC _57 Power Source / Network _104409 NETWORKING _0606038 CAN COMMUNICATION SYSTEM(for HEV Model) J

NETWORKING  CAN COMMUNICATION SYSTEM(for HEV Model)  Brake Actuator (Skid Control ECU) Communication Stop Mode  


DESCRIPTION

Detection Item Symptom Trouble Area
Brake Actuator (Skid Control ECU) Communication Stop Mode Communication stop for "Skid Control (ABS/VSC/TRAC)" is indicated on the "Communication Bus Check" screen of the GTS.
Click here(Click here)
·

Skid control ECU (brake actuator assembly) branch line or connector

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Power source circuit of skid control ECU (brake actuator assembly)

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Skid control ECU (brake actuator assembly) ground circuit

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Skid control ECU (brake actuator assembly)



WIRING DIAGRAM

C366193E35
0.135,1.542 0.604,1.708 0.469,0.167 10 false A184 0.135,1.698 2.896,1.948 2.76,0.25 10 false No. 2 Global CAN Junction Connector 2.229,2.177 4.115,2.438 1.885,0.26 10 false from Auxiliary Battery 2.208,3.271 3.583,3.49 1.375,0.219 10 false from IGR NO. 1 Relay 5.792,0.573 6.323,0.792 0.531,0.219 10 false CANH 4.292,3.427 5.406,3.625 1.115,0.198 10 false ECU-IGR NO. 4 4.458,2.365 5.583,2.552 1.125,0.188 10 false ABS NO. 1 4.458,2.896 5.271,3.073 0.813,0.177 10 false ABS NO. 2 5.802,1.125 6.333,1.344 0.531,0.219 10 false CANL 5.792,2.198 6.323,2.417 0.531,0.219 10 false +BM 5.792,2.74 6.323,2.958 0.531,0.219 10 false +BS 5.802,3.271 6.333,3.49 0.531,0.219 10 false IGR 5.792,3.813 6.323,4.031 0.531,0.219 10 false GND1 5.792,4.344 6.323,4.563 0.531,0.219 10 false GND2 1.625,0.51 1.833,0.729 0.208,0.219 10 false 1 1.615,1.052 1.823,1.271 0.208,0.219 10 false 12 5.594,0.51 5.802,0.729 0.208,0.219 10 false 5 5.521,1.052 5.729,1.271 0.208,0.219 10 false 19 5.594,2.094 5.802,2.313 0.208,0.219 10 false 1 5.521,2.646 5.729,2.865 0.208,0.219 10 false 30 5.521,3.198 5.729,3.417 0.208,0.219 10 false 36 5.531,4.26 5.74,4.479 0.208,0.219 10 false 14 5.531,3.708 5.74,3.927 0.208,0.219 10 false 46 5.375,4.729 5.844,4.896 0.469,0.167 10 false A151 5.365,4.885 6.917,5.302 1.552,0.417 10 false Skid Control ECU (Brake Actuator Assembly) 2.208,2.698 3.698,2.969 1.49,0.271 10 false from Auxiliary Battery

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 HEV Model)>HOW TO PROCEED WITH TROUBLESHOOTING

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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 (-) auxiliary battery terminal and leave the vehicle for 10 minute 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 auxiliary battery.

HINT:

When disconnecting and reconnecting the auxiliary 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

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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.

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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 HEV Model)>DIAGNOSIS SYSTEM

·

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



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 OPEN IN CAN BUS LINES (SKID CONTROL ECU (BRAKE ACTUATOR ASSEMBLY) BRANCH LINE)
a.
C437333C27
1.573,0.156 2.073,0.406 0.5,0.25 0.646,1.885 1.344,1.229 true 2.042,1.875 1.406,1.396 true 0.135,0.135 0.448,0.333 0.313,0.198 10 false *a 1.656,0.188 2.208,0.406 0.552,0.219 10 false A151 1.854,1.917 2.469,2.115 0.615,0.198 10 false CANH 0.479,1.906 1.094,2.104 0.615,0.198 10 false CANL
*a Front view of wire harness connector
(to Skid Control ECU (Brake Actuator Assembly))


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


b.

Disconnect the skid control ECU (brake actuator assembly) connector.


c.

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

Standard Resistance:
Tester Connection Condition Specified Condition
A151-5 (CANH) - A151-19 (CANL) Cable disconnected from negative (-) auxiliary battery terminal 54 to 69 Ω



Result:
Proceed to
OK
NG



OK

2.CHECK HARNESS AND CONNECTOR (POWER SOURCE CIRCUIT)

NG

REPAIR OR REPLACE CAN BRANCH LINES OR CONNECTOR (SKID CONTROL ECU (BRAKE ACTUATOR ASSEMBLY))

2.CHECK HARNESS AND CONNECTOR (POWER SOURCE CIRCUIT)
a.
C437333C31
1.573,0.156 2.073,0.406 0.5,0.25 2.875,1.052 2.573,0.396 true 0.813,0.438 0.573,1.052 true 2.885,1.344 2.583,1.917 true 1.729,1.885 1.49,1.073 true 0.833,1.917 0.583,1.323 true 0.135,0.135 0.448,0.333 0.313,0.198 10 false *a 1.656,0.188 2.208,0.406 0.552,0.219 10 false A151 0.74,1.927 1.052,2.125 0.313,0.198 10 false +BM 2.375,1.927 2.99,2.125 0.615,0.198 10 false GND2 2.177,0.271 2.792,0.469 0.615,0.198 10 false GND1 0.854,0.313 1.469,0.51 0.615,0.198 10 false +BS 1.688,1.917 2.302,2.115 0.615,0.198 10 false IGR
*a Front view of wire harness connector
(to Skid Control ECU (Brake Actuator Assembly))


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

Standard Resistance:
Tester Connection Condition Specified Condition
A151-46 (GND1) - Body ground Cable disconnected from negative (-) auxiliary battery terminal Below 1 Ω
A151-14 (GND2) - Body ground Cable disconnected from negative (-) auxiliary battery terminal Below 1 Ω



b.

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


c.

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

Standard Voltage:
Tester Connection Switch Condition Specified Condition
A151-1 (+BM) - Body ground Ignition switch OFF 11 to 14 V
A151-30 (+BS) - Body ground Ignition switch OFF 11 to 14 V
A151-36 (IGR) - Body ground Ignition switch ON 11 to 14 V



Result:
Proceed to
OK
NG



OK

REPLACE SKID CONTROL ECU (BRAKE ACTUATOR ASSEMBLY)

Click hereBrake>BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS>BRAKE ACTUATOR (for HEV Model)>REMOVAL


NG

REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT)