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


DESCRIPTION

Detection Item Symptom Trouble Area
Brake Actuator (Skid Control ECU) Communication Stop Mode Either condition is met:
·

"Skid Control (ABS/VSC/TRAC)" is not displayed on the CAN Bus Check screen of the GTS.

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·

Communication system DTCs (DTCs that start with U) that correspond to "Brake Actuator (Skid Control ECU) Communication Stop Mode" in "DTC Combination Table" are output.

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·

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

·

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

·

Skid control ECU (brake actuator assembly) ground circuit

·

Skid control ECU (brake actuator assembly)



WIRING DIAGRAM

C240763E63
2.521,1.115 2.313,0.771 2.313,0.771 2.104,0.771 false 4.438,1.115 4.625,0.719 4.625,0.719 4.885,0.719 false 6.229,2.646 6.656,2.844 0.427,0.198 10 false ECM 3.51,3.781 3.938,4.052 0.427,0.271 10 false A48*1 4.021,3.781 5.573,4.333 1.552,0.552 10 false Skid Control ECU (Brake Actuator Assembly) 2.708,0.396 3.083,0.573 0.375,0.177 10 false DLC3 1.417,4.99 3.344,5.344 1.927,0.354 10 false : CAN Main Bus Line (CANH) 4.385,5 6.125,5.354 1.74,0.354 10 false : CAN Branch Line (CANH) 4.385,5.406 6.125,5.76 1.74,0.354 10 false : CAN Branch Line (CANL) 1.427,5.406 3.354,5.76 1.927,0.354 10 false : CAN Main Bus Line (CANL) 2.875,3.448 3.865,3.667 0.99,0.219 10 false ECU-IG NO. 1 4.146,4.604 5.198,4.813 1.052,0.208 10 false Trouble Area 4.01,3.302 4.344,3.49 0.333,0.188 10 false IG1 4.958,3.302 5.375,3.479 0.417,0.177 10 false GND1 4.25,3.073 4.677,3.25 0.427,0.177 10 false CANH 4.76,3.083 5.156,3.26 0.396,0.177 10 false CANL 3.719,3.208 3.938,3.385 0.219,0.177 10 false 34 5.438,3.188 5.667,3.365 0.229,0.177 10 false 1 4.271,2.854 4.531,3.052 0.26,0.198 10 false 25 4.906,2.854 5.125,3.031 0.219,0.177 10 false 14 0.177,0.667 2.188,0.854 2.01,0.188 10 false No. 2 CAN Junction Connector 4.969,0.625 6.979,0.813 2.01,0.188 10 false No. 1 CAN Junction Connector 0.448,2.688 1.656,3.031 1.208,0.344 10 false Combination Meter Assembly 0.823,2.042 1.271,2.188 0.448,0.146 10 false 120 Ω 6.156,2.052 6.604,2.198 0.448,0.146 10 false 120 Ω 0.083,0.073 1.521,0.365 1.438,0.292 12 false V Bus: 0.708,3.469 1.927,3.729 1.219,0.26 10 false *1: w/ ABS 3.51,3.927 3.938,4.198 0.427,0.271 10 false A64*2 0.708,3.823 1.927,4.083 1.219,0.26 10 false *2: w/ VSC

CAUTION / NOTICE / HINT

CAUTION:

When performing the confirmation driving pattern, obey all speed limits and traffic laws.


NOTICE:
·

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 1 minute or more before measuring the resistance.

·

After turning the ignition switch off, waiting time may be required before disconnecting the cable from the negative (-) battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) battery terminal notices before proceeding with work.

Click hereGeneral>INTRODUCTION>REPAIR INSTRUCTION>PRECAUTION

·

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>HOW TO PROCEED WITH TROUBLESHOOTING

·

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.

Click herePower Source / Network>NETWORKING>CAN COMMUNICATION SYSTEM>DIAGNOSIS SYSTEM

·

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



HINT:
·

Operating the ignition switch, any other switches or a door triggers related ECU and sensor communication on the CAN. This communication will cause the resistance value to change.

·

Even after DTCs are cleared, if a DTC is stored again after driving the vehicle for a while, the malfunction may be occurring due to vibration of the vehicle. In such a case, wiggling the ECUs or wire harness while performing the inspection below may help determine the cause of the malfunction.



PROCEDURE

1.CHECK VEHICLE TYPE
a.

Check vehicle type.

Result:
Result Proceed to
w/ ABS A
w/ VSC B




A

2.CHECK FOR DTC (BRAKE CONTROL SYSTEM)

B

5.CHECK FOR DTC (BRAKE CONTROL SYSTEM)
2.CHECK FOR DTC (BRAKE CONTROL SYSTEM)
a.

Connect the GTS to the DLC3.


b.

Turn the ignition switch to ON.


c.

Turn the GTS on.


d.

Enter the following menus: Chassis / ABS/VSC/TRC / Trouble Codes.

Chassis > ABS/VSC/TRC > Trouble Codes
50001 105

Result:
Result Proceed to
DTC C1242 is not output A
DTC C1242 is output B



A

3.CHECK FOR OPEN IN CAN BUS LINES (SKID CONTROL ECU (BRAKE ACTUATOR ASSEMBLY) BRANCH LINE)

B

GO TO DIAGNOSIS PROCEDURE INDICATED BY OUTPUT DTC

Click hereBrake>BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS>ANTI-LOCK BRAKE SYSTEM>C1241


3.CHECK FOR OPEN IN CAN BUS LINES (SKID CONTROL ECU (BRAKE ACTUATOR ASSEMBLY) BRANCH LINE)
a.

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


b.

Disconnect the A48 skid control ECU (brake actuator assembly) connector.


c.
C355244C02
1.479,0.313 1.896,0.563 0.417,0.25 1.26,1.854 0.865,0.698 0.865,0.698 0.74,0.698 true 1.26,1.969 0.885,2.74 0.885,2.74 0.76,2.74 true 1.573,0.365 2.031,0.563 0.458,0.198 10 false A48 0.333,0.635 0.844,0.865 0.51,0.229 10 false CANL 0.354,2.667 0.865,2.896 0.51,0.229 10 false CANH 0.115,0.083 0.573,0.281 0.458,0.198 10 false *a
*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
A48-25 (CANH) - A48-14 (CANL) Cable disconnected from negative (-) battery terminal 54 to 69 Ω



Result:
Result
OK
NG



OK

4.CHECK HARNESS AND CONNECTOR (POWER SOURCE CIRCUIT)

NG

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

4.CHECK HARNESS AND CONNECTOR (POWER SOURCE CIRCUIT)
a.
C355244C03
1.479,0.313 1.896,0.563 0.417,0.25 0.979,1.573 0.979,0.74 0.979,0.74 0.813,0.74 true 2.146,1.99 2.146,2.74 2.146,2.74 2.313,2.74 true 1.573,0.365 2.031,0.563 0.458,0.198 10 false A48 0.406,0.667 0.917,0.896 0.51,0.229 10 false GND1 2.385,2.656 2.698,2.906 0.313,0.25 10 false IG1 0.115,0.083 0.573,0.281 0.458,0.198 10 false *a
*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
A48-1 (GND1) - Body ground Cable disconnected from negative (-) battery terminal Below 1 Ω



b.

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


c.

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

Standard Voltage:
Tester Connection Condition Specified Condition
A48-34 (IG1) - Body ground Ignition switch ON 11 to 14 V



Result:
Result
OK
NG



OK

REPLACE SKID CONTROL ECU (BRAKE ACTUATOR ASSEMBLY)

Click hereBrake>BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS>BRAKE ACTUATOR>REMOVAL


NG

REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT)

5.CHECK FOR DTC (BRAKE CONTROL SYSTEM)
a.

Connect the GTS to the DLC3.


b.

Turn the ignition switch to ON.


c.

Turn the GTS on.


d.

Enter the following menus: Chassis / ABS/VSC/TRC / Trouble Codes.

Chassis > ABS/VSC/TRC > Trouble Codes
50001 105

Result:
Result Proceed to
DTC C1242 is not output A
DTC C1242 is output B



A

6.CHECK FOR OPEN IN CAN BUS LINES (SKID CONTROL ECU (BRAKE ACTUATOR ASSEMBLY) BRANCH LINE)

B

GO TO DIAGNOSIS PROCEDURE INDICATED BY OUTPUT DTC

Click hereBrake>BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS>VEHICLE STABILITY CONTROL SYSTEM>C1241


6.CHECK FOR OPEN IN CAN BUS LINES (SKID CONTROL ECU (BRAKE ACTUATOR ASSEMBLY) BRANCH LINE)
a.

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


b.

Disconnect the A64 skid control ECU (brake actuator assembly) connector.


c.
C289256C16
1.479,0.646 1.979,0.969 0.5,0.323 0.875,0.906 1,0.906 1,0.906 1.313,1.948 true 1.323,2.031 1.177,2.771 1.177,2.771 1.063,2.771 true 0.083,0.094 0.396,0.292 0.313,0.198 10 false *a 0.646,2.677 1.26,2.875 0.615,0.198 10 false CANH 0.479,0.823 1.094,1.021 0.615,0.198 10 false CANL 1.615,0.708 2.073,0.906 0.458,0.198 10 false A64
*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
A64-25 (CANH) - A64-14 (CANL) Cable disconnected from negative (-) battery terminal 54 to 69 Ω



Result:
Result
OK
NG



OK

7.CHECK HARNESS AND CONNECTOR (POWER SOURCE CIRCUIT)

NG

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

7.CHECK HARNESS AND CONNECTOR (POWER SOURCE CIRCUIT)
a.
C289256C17
1.51,0.698 1.948,0.979 0.438,0.281 0.885,0.917 1.052,0.917 1.052,0.917 1.052,1.667 true 2.135,2.042 2.135,2.708 2.135,2.708 1.969,2.708 true 0.083,0.094 0.396,0.292 0.313,0.198 10 false *a 1.615,0.75 2.073,0.948 0.458,0.198 10 false A64 1.688,2.635 2.042,2.875 0.354,0.24 10 false IG1 0.458,0.844 1.073,1.042 0.615,0.198 10 false GND1
*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
A64-1 (GND1) - Body ground Cable disconnected from negative (-) battery terminal Below 1 Ω



b.

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


c.

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

Standard Voltage:
Tester Connection Condition Specified Condition
A64-34 (IG1) - Body ground Ignition switch ON 11 to 14 V



Result:
Result
OK
NG



OK

REPLACE SKID CONTROL ECU (BRAKE ACTUATOR ASSEMBLY)

Click hereBrake>BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS>BRAKE ACTUATOR>REMOVAL


NG

REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT)