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

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

DESCRIPTION

Detection Item	Symptom	Trouble Area
Brake Booster (Skid Control ECU) Communication Stop Mode	Communication stop for "Brake Booster" is indicated on the "Communication Bus Check" screen of the GTS. Click here(202307,999999,_57,_104409,_0606038,RM100000002C0LE,)	· Electric brake booster (brake booster with master cylinder assembly) branch line or connector · Power source circuit of electric brake booster (brake booster with master cylinder assembly) · Electric brake booster (brake booster with master cylinder assembly) ground circuit · Electric brake booster (brake booster with master cylinder assembly)

WIRING DIAGRAM

1.635,0.979 1.875,1.156 0.24,0.177 10 false 15 0.094,1.51 0.833,1.677 0.74,0.167 10 false A184 0.083,1.677 2.938,1.917 2.854,0.24 10 false No. 2 Global CAN Junction Connector 5.573,0.458 5.813,0.729 0.24,0.271 10 false 2 1.656,0.458 1.844,0.635 0.188,0.177 10 false 4 5.51,0.979 5.76,1.156 0.25,0.177 10 false 12 5.781,0.521 6.229,0.729 0.448,0.208 10 false CANH 5.802,1.073 6.25,1.281 0.448,0.208 10 false CANL 5.813,2.146 6.26,2.354 0.448,0.208 10 false +BS 5.833,2.708 6.281,2.917 0.448,0.208 10 false IGR 5.833,3.25 6.385,3.458 0.552,0.208 10 false GND 5.521,2.063 5.76,2.25 0.24,0.188 10 false 11 5.573,2.594 5.76,2.771 0.188,0.177 10 false 4 5.51,3.115 5.74,3.333 0.229,0.219 10 false 26 4.458,2.323 5.813,2.583 1.354,0.26 10 false ABS MAIN 4.323,2.854 5.396,3.073 1.073,0.219 10 false ECU-IGR NO. 4 5.271,3.625 5.708,3.833 0.438,0.208 10 false A194 5.26,3.802 7.104,4.385 1.844,0.583 10 false Electric Brake Booster (Brake Booster with Master Cylinder Assembly) 2.208,2.135 3.677,2.354 1.469,0.219 10 false from Auxiliary Battery 2.198,2.667 3.604,2.875 1.406,0.208 10 false from IGR NO. 1 Relay

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 TROUBLESHOOTING202307,999999,_57,_104409,_0606038,RM100000002C0LC,

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 BATTERY202307,999999,_V1,_106911,_0485800,RM100000002CEKY,

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 CHART202307,999999,_V1,_106911,_0485800,RM100000002CEKZ,

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

Click hereGeneral>SETUP>WHEN REPLACING OR REMOVING/INSTALLING PARTS>WORK PROCEDURE202307,202405,_V1,_106911,_0485801,RM100000002CEL0,202405,999999,_V1,_106911,_0485801,RM100000002NHZS,

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 HEV Model)>DIAGNOSIS SYSTEM202307,999999,_57,_104409,_0606038,RM100000002C0LE,

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 (ELECTRIC BRAKE BOOSTER (BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY) BRANCH LINE)

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

Disconnect the electric brake booster (brake booster with master cylinder assembly) connector.

1.552,0.083 1.969,0.333 0.417,0.25 0.708,1.948 1.208,0.948 true 1.677,1.958 1.313,1.156 true 0.167,0.125 0.479,0.281 0.313,0.156 10 false *a 1.594,0.135 1.969,0.354 0.375,0.219 10 false A194 0.375,1.958 0.844,2.177 0.469,0.219 10 false CA1H 1.688,1.958 2.156,2.177 0.469,0.219 10 false CA1L

*a	Front view of wire harness connector (to Electric Brake Booster (Brake Booster with Master Cylinder Assembly))

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
A194-2 (CA1H) - A194-12 (CA1L)	Cable disconnected from negative (-) auxiliary battery terminal	54 to 69 Ω

Result:

Proceed to
OK
NG

2.CHECK HARNESS AND CONNECTOR (POWER SOURCE CIRCUIT)

REPAIR OR REPLACE CAN BRANCH LINES OR CONNECTOR (ELECTRIC BRAKE BOOSTER (BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY))

2.CHECK HARNESS AND CONNECTOR (POWER SOURCE CIRCUIT)

1.552,0.083 1.969,0.333 0.417,0.25 0.365,1.854 0.917,1.323 true 1.146,1.917 1.5,0.958 true 2.865,1.906 2.604,1.333 true 0.167,0.125 0.479,0.281 0.313,0.156 10 false *a 1.594,0.125 2.01,0.323 0.417,0.198 10 false A194 0.115,1.875 0.521,2.094 0.406,0.219 10 false +BS 0.938,1.948 1.344,2.167 0.406,0.219 10 false IGR 2.833,1.927 3.24,2.146 0.406,0.219 10 false GND

*a	Front view of wire harness connector (to Electric Brake Booster (Brake Booster with Master Cylinder Assembly))

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
A194-26 (GND) - Body ground	Cable disconnected from negative (-) auxiliary battery terminal	Below 1 Ω

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

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

Standard Voltage:

Tester Connection	Switch Condition	Specified Condition
A194-11 (+BS) - Body ground	Ignition switch off	11 to 14 V
A194-4 (IGR) - Body ground	Ignition switch ON	11 to 14 V

Result:

Proceed to
OK
NG

REPLACE ELECTRIC BRAKE BOOSTER (BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY)

Click hereBrake>BRAKE SYSTEM (OTHER)>BRAKE BOOSTER (for HEV Model)>REMOVAL202307,999999,_54,_113942,_0604484,RM100000002BUHY,

REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT)