Toyota Corolla Cross: Lost Communication with Brake System Control Module (ch2) Missing Message (U117087)

Toyota Corolla Cross (2022-2025) Service Manual / Power Source & Network / Networking / Can Communication System (for Gasoline Model) / Lost Communication with Brake System Control Module (ch2) Missing Message (U117087)

DESCRIPTION

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	Note
U117087	Lost Communication with Brake System Control Module (ch2) Missing Message	Communication stops between the engine stop and start ECU and the brake actuator assembly.	CAN main/branch bus lines or connector Brake actuator assembly Engine stop and start ECU ECM No. 9 global CAN junction connector	DTC Output from Engine stop and start ECU

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

Note

U117087

Lost Communication with Brake System Control Module (ch2) Missing Message

Communication stops between the engine stop and start ECU and the brake actuator assembly.

CAN main/branch bus lines or connector
Brake actuator assembly
Engine stop and start ECU
ECM
No. 9 global CAN junction connector

DTC Output from

Engine stop and start ECU

WIRING DIAGRAM

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.
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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 1 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.
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When disconnecting and reconnecting the auxiliary battery.
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HINT:

When disconnecting and reconnecting the auxiliary battery, there is an automatic learning function that completes learning when the respective system is used.

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Some parts must be initialized and set when replacing or removing and installing parts.
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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.
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.
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Before replacing the ECM, refer to Registration.
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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 MAIN BUS LINES

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

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

Component with harness connected

(No. 9 Global CAN Junction Connector)

Standard Resistance:

Tester Connection	Condition	Specified Condition
A193-1 (CANH) - A193-12 (CANL)	Cable disconnected from negative (-) auxiliary battery terminal	Below 70 Ω

GO TO STEP 23

2.	CHECK FOR SHORT IN CAN BUS LINES

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

Component with harness connected

(No. 9 Global CAN Junction Connector)

Standard Resistance:

Tester Connection	Condition	Specified Condition
A193-1 (CANH) - A193-12 (CANL)	Cable disconnected from negative (-) auxiliary battery terminal	54 Ω or higher

GO TO STEP 17

3.	CHECK FOR SHORT TO +B IN CAN BUS LINE

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

DLC3

Component with harness connected

(No. 9 Global CAN Junction Connector)

Standard Resistance:

Tester Connection	Condition	Specified Condition
A193-1 (CANH) - I26-16 (BAT)	Cable disconnected from negative (-) auxiliary battery terminal	6 kΩ or higher
A193-12 (CANL) - I26-16 (BAT)		6 kΩ or higher

GO TO STEP 11

4.	CHECK FOR SHORT TO GND IN CAN BUS LINE

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

DLC3

Component with harness connected

(No. 9 Global CAN Junction Connector)

Standard Resistance:

Tester Connection	Condition	Specified Condition
A193-1 (CANH) - I26-4 (CG)	Cable disconnected from negative (-) auxiliary battery terminal	200 Ω or higher
A193-12 (CANL) - I26-4 (CG)		200 Ω or higher

INSPECT FOR INTERMITTENT PROBLEMS

5.	CHECK FOR SHORT TO GND IN CAN BUS LINE (NO. 9 GLOBAL CAN JUNCTION CONNECTOR - BRAKE ACTUATOR ASSEMBLY)

(a) Disconnect the No. 9 global CAN junction connector.

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

DLC3

Front view of wire harness connector

(to No. 9 Global CAN Junction Connector)

to Brake Actuator Assembly

Standard Resistance:

Tester Connection	Condition	Specified Condition
A193-1 (CANH) - I26-4 (CG)	Cable disconnected from negative (-) auxiliary battery terminal	200 Ω or higher
A193-12 (CANL) - I26-4 (CG)		200 Ω or higher

GO TO STEP 8

6.	CHECK FOR SHORT TO GND IN CAN BUS LINE (NO. 9 GLOBAL CAN JUNCTION CONNECTOR - ENGINE STOP AND START ECU)

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

DLC3

Front view of wire harness connector

(to No. 9 Global CAN Junction Connector)

to Engine Stop and Start ECU

Standard Resistance:

Tester Connection	Condition	Specified Condition
A193-3 (CANH) - I26-4 (CG)	Cable disconnected from negative (-) auxiliary battery terminal	200 Ω or higher
A193-14 (CANL) - I26-4 (CG)		200 Ω or higher

GO TO STEP 9

7.	CHECK FOR SHORT TO GND IN CAN BUS LINE (NO. 9 GLOBAL CAN JUNCTION CONNECTOR - ECM)

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

DLC3

Front view of wire harness connector

(to No. 9 Global CAN Junction Connector)

to ECM

Standard Resistance:

Tester Connection	Condition	Specified Condition
A193-2 (CANH) - I26-4 (CG)	Cable disconnected from negative (-) auxiliary battery terminal	200 Ω or higher
A193-13 (CANL) - I26-4 (CG)		200 Ω or higher

REPLACE NO. 9 GLOBAL CAN JUNCTION CONNECTOR

GO TO STEP 10

8.	CHECK FOR SHORT TO GND IN CAN BUS LINE (NO. 9 GLOBAL CAN JUNCTION CONNECTOR - BRAKE ACTUATOR ASSEMBLY)

(a) Disconnect the A151 brake actuator assembly connector.

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

DLC3

Front view of wire harness connector

(to No. 9 Global CAN Junction Connector)

to Brake Actuator Assembly

Standard Resistance:

Tester Connection	Condition	Specified Condition
A193-1 (CANH) - I26-4 (CG)	Cable disconnected from negative (-) auxiliary battery terminal	200 Ω or higher
A193-12 (CANL) - I26-4 (CG)		200 Ω or higher

REPLACE BRAKE ACTUATOR ASSEMBLY

REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (NO. 9 GLOBAL CAN JUNCTION CONNECTOR - BRAKE ACTUATOR ASSEMBLY)

9.	CHECK FOR SHORT TO GND IN CAN BUS LINE (NO. 9 GLOBAL CAN JUNCTION CONNECTOR - ENGINE STOP AND START ECU)

(a) Disconnect the I230 engine stop and start ECU connector.

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

DLC3

Front view of wire harness connector

(to No. 9 Global CAN Junction Connector)

to Engine Stop and Start ECU

Standard Resistance:

Tester Connection	Condition	Specified Condition
A193-3 (CANH) - I26-4 (CG)	Cable disconnected from negative (-) auxiliary battery terminal	200 Ω or higher
A193-14 (CANL) - I26-4 (CG)		200 Ω or higher

REPLACE ENGINE STOP AND START ECU

REPAIR OR REPLACE CAN BRANCH LINE OR CONNECTOR (NO. 9 GLOBAL CAN JUNCTION CONNECTOR - ENGINE STOP AND START ECU)

10.	CHECK FOR SHORT TO GND IN CAN BUS LINE (NO. 9 GLOBAL CAN JUNCTION CONNECTOR - ECM)

(a) Disconnect the A47 ECM connector.

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

DLC3

Front view of wire harness connector

(to No. 9 Global CAN Junction Connector)

to ECM

Standard Resistance:

Tester Connection	Condition	Specified Condition
A193-2 (CANH) - I26-4 (CG)	Cable disconnected from negative (-) auxiliary battery terminal	200 Ω or higher
A193-13 (CANL) - I26-4 (CG)		200 Ω or higher

REPLACE ECM

REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (NO. 9 GLOBAL CAN JUNCTION CONNECTOR - ECM)

11.	CHECK FOR SHORT TO +B IN CAN BUS LINE (NO. 9 GLOBAL CAN JUNCTION CONNECTOR - BRAKE ACTUATOR ASSEMBLY)

(a) Disconnect the No. 9 global CAN junction connector.

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

DLC3

Front view of wire harness connector

(to No. 9 Global CAN Junction Connector)

to Brake Actuator Assembly

Standard Resistance:

Tester Connection	Condition	Specified Condition
A193-1 (CANH) - I26-16 (BAT)	Cable disconnected from negative (-) auxiliary battery terminal	6 kΩ or higher
A193-12 (CANL) - I26-16 (BAT)		6 kΩ or higher

GO TO STEP 14

12.	CHECK FOR SHORT TO +B IN CAN BUS LINE (NO. 9 GLOBAL CAN JUNCTION CONNECTOR - ENGINE STOP AND START ECU)

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

DLC3

Front view of wire harness connector

(to No. 9 Global CAN Junction Connector)

to Engine Stop and Start ECU

Standard Resistance:

Tester Connection	Condition	Specified Condition
A193-3 (CANH) - I26-16 (BAT)	Cable disconnected from negative (-) auxiliary battery terminal	6 kΩ or higher
A193-14 (CANL) - I26-16 (BAT)		6 kΩ or higher

GO TO STEP 15

13.	CHECK FOR SHORT TO +B IN CAN BUS LINE (NO. 9 GLOBAL CAN JUNCTION CONNECTOR - ECM)

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

DLC3

Front view of wire harness connector

(to No. 9 Global CAN Junction Connector)

to ECM

Standard Resistance:

Tester Connection	Condition	Specified Condition
A193-2 (CANH) - I26-16 (BAT)	Cable disconnected from negative (-) auxiliary battery terminal	6 kΩ or higher
A193-13 (CANL) - I26-16 (BAT)		6 kΩ or higher

REPLACE NO. 9 GLOBAL CAN JUNCTION CONNECTOR

GO TO STEP 16

14.	CHECK FOR SHORT TO +B IN CAN BUS LINE (NO. 9 GLOBAL CAN JUNCTION CONNECTOR - BRAKE ACTUATOR ASSEMBLY)

(a) Disconnect the A151 brake actuator assembly connector.

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

DLC3

Front view of wire harness connector

(to No. 9 Global CAN Junction Connector)

to Brake Actuator Assembly

Standard Resistance:

Tester Connection	Condition	Specified Condition
A193-1 (CANH) - I26-16 (BAT)	Cable disconnected from negative (-) auxiliary battery terminal	6 kΩ or higher
A193-12 (CANL) - I26-16 (BAT)		6 kΩ or higher

REPLACE BRAKE ACTUATOR ASSEMBLY

REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (NO. 9 GLOBAL CAN JUNCTION CONNECTOR - BRAKE ACTUATOR ASSEMBLY)

15.	CHECK FOR SHORT TO +B IN CAN BUS LINE (NO. 9 GLOBAL CAN JUNCTION CONNECTOR - ENGINE STOP AND START ECU)

(a) Disconnect the I230 engine stop and start ECU connector.

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

DLC3

Front view of wire harness connector

(to No. 9 Global CAN Junction Connector)

to Engine Stop and Start ECU

Standard Resistance:

Tester Connection	Condition	Specified Condition
A193-3 (CANH) - I26-16 (BAT)	Cable disconnected from negative (-) auxiliary battery terminal	6 kΩ or higher
A193-14 (CANL) - I26-16 (BAT)		6 kΩ or higher

REPLACE ENGINE STOP AND START ECU

REPAIR OR REPLACE CAN BRANCH LINE OR CONNECTOR (NO. 9 GLOBAL CAN JUNCTION CONNECTOR - ENGINE STOP AND START ECU)

16.	CHECK FOR SHORT TO +B IN CAN BUS LINE (NO. 9 GLOBAL CAN JUNCTION CONNECTOR - ECM)

(a) Disconnect the A47 ECM connector.

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

DLC3

Front view of wire harness connector

(to No. 9 Global CAN Junction Connector)

to ECM

Standard Resistance:

Tester Connection	Condition	Specified Condition
A193-2 (CANH) - I26-16 (BAT)	Cable disconnected from negative (-) auxiliary battery terminal	6 kΩ or higher
A193-13 (CANL) - I26-16 (BAT)		6 kΩ or higher

REPLACE ECM

REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (NO. 9 GLOBAL CAN JUNCTION CONNECTOR - ECM)

17.	CHECK FOR SHORT IN CAN BUS LINES (NO. 9 GLOBAL CAN JUNCTION CONNECTOR - BRAKE ACTUATOR ASSEMBLY)

(a) Disconnect the No. 9 global CAN junction connector.

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

Front view of wire harness connector

(to No. 9 Global CAN Junction Connector)

to Brake Actuator Assembly

Standard Resistance:

Tester Connection	Condition	Specified Condition
A193-1 (CANH) - A193-12 (CANL)	Cable disconnected from negative (-) auxiliary battery terminal	108 to 132 Ω

GO TO STEP 20

18.	CHECK FOR SHORT IN CAN BUS LINES (NO. 9 GLOBAL CAN JUNCTION CONNECTOR - ENGINE STOP AND START ECU)

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

Front view of wire harness connector

(to No. 9 Global CAN Junction Connector)

to Engine Stop and Start ECU

Standard Resistance:

Tester Connection	Condition	Specified Condition
A193-3 (CANH) - A193-14 (CANL)	Cable disconnected from negative (-) auxiliary battery terminal	200 Ω or higher

GO TO STEP 21

19.	CHECK FOR SHORT IN CAN BUS LINES (NO. 9 GLOBAL CAN JUNCTION CONNECTOR - ECM)

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

Front view of wire harness connector

(to No. 9 Global CAN Junction Connector)

to ECM

Standard Resistance:

Tester Connection	Condition	Specified Condition
A193-2 (CANH) - A193-13 (CANL)	Cable disconnected from negative (-) auxiliary battery terminal	108 to 132 Ω

REPLACE NO. 9 GLOBAL CAN JUNCTION CONNECTOR

GO TO STEP 22

20.	CHECK FOR SHORT IN CAN BUS LINES (NO. 9 GLOBAL CAN JUNCTION CONNECTOR - BRAKE ACTUATOR ASSEMBLY)

(a) Disconnect the A151 brake actuator assembly connector.

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

Front view of wire harness connector

(to No. 9 Global CAN Junction Connector)

to Brake Actuator Assembly

Standard Resistance:

Tester Connection	Condition	Specified Condition
A193-1 (CANH) - A193-12 (CANL)	Cable disconnected from negative (-) auxiliary battery terminal	1 MΩ or higher

REPLACE BRAKE ACTUATOR ASSEMBLY

REPAIR OR REPLACE CAN MAIN BUS LINES OR CONNECTOR (NO. 9 GLOBAL CAN JUNCTION CONNECTOR - BRAKE ACTUATOR ASSEMBLY)

21.	CHECK FOR SHORT IN CAN BUS LINES (NO. 9 GLOBAL CAN JUNCTION CONNECTOR - ENGINE STOP AND START ECU)

(a) Disconnect the I230 engine stop and start ECU connector.

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

Front view of wire harness connector

(to No. 9 Global CAN Junction Connector)

to Engine Stop and Start ECU

Standard Resistance:

Tester Connection	Condition	Specified Condition
A193-3 (CANH) - A193-14 (CANL)	Cable disconnected from negative (-) auxiliary battery terminal	1 MΩ or higher

REPLACE ENGINE STOP AND START ECU

REPAIR OR REPLACE CAN BRANCH LINES OR CONNECTOR (NO. 9 GLOBAL CAN JUNCTION CONNECTOR - ENGINE STOP AND START ECU)

22.	CHECK FOR SHORT IN CAN BUS LINES (NO. 9 GLOBAL CAN JUNCTION CONNECTOR - ECM)

(a) Disconnect the A47 ECM connector.

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

Front view of wire harness connector

(to No. 9 Global CAN Junction Connector)

to ECM

Standard Resistance:

Tester Connection	Condition	Specified Condition
A193-2 (CANH) - A193-13 (CANL)	Cable disconnected from negative (-) auxiliary battery terminal	1 MΩ or higher

REPLACE ECM

REPAIR OR REPLACE CAN MAIN BUS LINES OR CONNECTOR (NO. 9 GLOBAL CAN JUNCTION CONNECTOR - ECM)

23.	CHECK FOR OPEN IN CAN MAIN BUS LINES (BRAKE ACTUATOR ASSEMBLY)

(a) Disconnect the brake actuator assembly connector.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
A151-11 (CA2H) - A151-25 (CA2L)	Cable disconnected from negative (-) auxiliary battery terminal	108 to 132 Ω

*a	Front view of wire harness connector (to Brake Actuator Assembly)

REPLACE BRAKE ACTUATOR ASSEMBLY

24.	CHECK FOR OPEN IN CAN MAIN BUS LINES (NO. 9 GLOBAL CAN JUNCTION CONNECTOR - BRAKE ACTUATOR ASSEMBLY)

(a) Reconnect the A151 brake actuator assembly connector.

(b) Disconnect the No. 9 global CAN junction connector.

Front view of wire harness connector

(to No. 9 Global CAN Junction Connector)

to Brake Actuator Assembly

Standard Resistance:

Tester Connection	Condition	Specified Condition
A193-1 (CANH) - A193-12 (CANL)	Cable disconnected from negative (-) auxiliary battery terminal	108 to 132 Ω

REPAIR OR REPLACE CAN MAIN BUS LINES OR CONNECTOR (NO. 9 GLOBAL CAN JUNCTION CONNECTOR - BRAKE ACTUATOR ASSEMBLY)

25.	CHECK FOR OPEN IN CAN MAIN BUS LINES (NO. 9 GLOBAL CAN JUNCTION CONNECTOR - ECM)

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

Front view of wire harness connector

(to No. 9 Global CAN Junction Connector)

to ECM

Standard Resistance:

Tester Connection	Condition	Specified Condition
A193-2 (CANH) - A193-13 (CANL)	Cable disconnected from negative (-) auxiliary battery terminal	108 to 132 Ω

REPLACE NO. 9 GLOBAL CAN JUNCTION CONNECTOR

26.	CHECK FOR OPEN IN CAN MAIN BUS LINES (ECM)

(a) Reconnect the A193 No. 9 global CAN junction connector.

(b) Disconnect the ECM connector.

Standard Resistance:

Tester Connection	Condition	Specified Condition
A47-7 (CAN+) - A47-17 (CAN-)	Cable disconnected from negative (-) auxiliary battery terminal	108 to 132 Ω

*a	Front view of wire harness connector (to ECM)

REPLACE ECM

REPAIR OR REPLACE CAN MAIN BUS LINES OR CONNECTOR (NO. 9 GLOBAL CAN JUNCTION CONNECTOR - ECM)

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