DTC U1170-87: Lost Communication with Brake System Control Module (ch2) Missing Message [11/2023 - ]: Procedure
- CHECK FOR OPEN IN CAN MAIN BUS LINES
- Disconnect the cable from the negative (-) auxiliary battery terminal.
- Measure the resistance according to the value(s) in the table below.
*a 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 Result
Proceed to OK NG
Result:
NG
See step 23
Result:
OK
See step 2
- CHECK FOR SHORT IN CAN BUS LINES
- Measure the resistance according to the value(s) in the table below.
*a 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 Result
Proceed to OK NG
Result:
NG
See step 17
Result:
OK
See step 3
- Measure the resistance according to the value(s) in the table below.
- CHECK FOR SHORT TO +B IN CAN BUS LINE
- Measure the resistance according to the value(s) in the table below.
*1 DLC3 - - *a 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) Result
Proceed to OK NG
Result:
NG
See step 11
Result:
OK
See step 4
- Measure the resistance according to the value(s) in the table below.
- CHECK FOR SHORT TO GND IN CAN BUS LINE
- Measure the resistance according to the value(s) in the table below.
*1 DLC3 - - *a 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) Result
Proceed to OK NG
Result:
OK
INSPECT FOR INTERMITTENT PROBLEMS
Refer to HOW TO PROCEED WITH TROUBLESHOOTING [09/2021 - ]
Result:
NG
See step 5
- Measure the resistance according to the value(s) in the table below.
- CHECK FOR SHORT TO GND IN CAN BUS LINE (NO. 9 GLOBAL CAN JUNCTION CONNECTOR - BRAKE ACTUATOR ASSEMBLY)
- Disconnect the No. 9 global CAN junction connector.
- Measure the resistance according to the value(s) in the table below.
*1 DLC3 - - *a Front view of wire harness connector
(to No. 9 Global CAN Junction Connector)*b 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) Result
Proceed to OK NG
Result:
NG
See step 8
Result:
OK
See step 6
- CHECK FOR SHORT TO GND IN CAN BUS LINE (NO. 9 GLOBAL CAN JUNCTION CONNECTOR - ENGINE STOP AND START ECU)
- Measure the resistance according to the value(s) in the table below.
*1 DLC3 - - *a Front view of wire harness connector
(to No. 9 Global CAN Junction Connector)*b 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) Result
Proceed to OK NG
Result:
NG
See step 9
Result:
OK
See step 7
- Measure the resistance according to the value(s) in the table below.
- CHECK FOR SHORT TO GND IN CAN BUS LINE (NO. 9 GLOBAL CAN JUNCTION CONNECTOR - ECM)
- Measure the resistance according to the value(s) in the table below.
*1 DLC3 - - *a Front view of wire harness connector
(to No. 9 Global CAN Junction Connector)*b 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) Result
Proceed to OK NG
Result:
OK
REPLACE NO. 9 GLOBAL CAN JUNCTION CONNECTOR
Result:
NG
See step 10
- Measure the resistance according to the value(s) in the table below.
- CHECK FOR SHORT TO GND IN CAN BUS LINE (NO. 9 GLOBAL CAN JUNCTION CONNECTOR - BRAKE ACTUATOR ASSEMBLY)
- Disconnect the A151 brake actuator assembly connector.
- Measure the resistance according to the value(s) in the table below.
*1 DLC3 - - *a Front view of wire harness connector
(to No. 9 Global CAN Junction Connector)*b 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) Result
Proceed to OK NG
Result:
OK
REPLACE BRAKE ACTUATOR ASSEMBLY
Refer to REMOVAL [11/2022 - ]
Result:
NG
REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (NO. 9 GLOBAL CAN JUNCTION CONNECTOR - BRAKE ACTUATOR ASSEMBLY)
- CHECK FOR SHORT TO GND IN CAN BUS LINE (NO. 9 GLOBAL CAN JUNCTION CONNECTOR - ENGINE STOP AND START ECU)
- Disconnect the I230 engine stop and start ECU connector.
- Measure the resistance according to the value(s) in the table below.
*1 DLC3 - - *a Front view of wire harness connector
(to No. 9 Global CAN Junction Connector)*b 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) Result
Proceed to OK NG
Result:
OK
REPLACE ENGINE STOP AND START ECU
Refer to REMOVAL [11/2022 - ]
Result:
NG
REPAIR OR REPLACE CAN BRANCH LINE OR CONNECTOR (NO. 9 GLOBAL CAN JUNCTION CONNECTOR - ENGINE STOP AND START ECU)
- CHECK FOR SHORT TO GND IN CAN BUS LINE (NO. 9 GLOBAL CAN JUNCTION CONNECTOR - ECM)
- Disconnect the A199 ECM connector.
- Measure the resistance according to the value(s) in the table below.
*1 DLC3 - - *a Front view of wire harness connector
(to No. 9 Global CAN Junction Connector)*b 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) Result
Proceed to OK NG
Result:
OK
REPLACE ECM
Refer to REMOVAL [11/2023 - ]
Result:
NG
REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (NO. 9 GLOBAL CAN JUNCTION CONNECTOR - ECM)
- CHECK FOR SHORT TO +B IN CAN BUS LINE (NO. 9 GLOBAL CAN JUNCTION CONNECTOR - BRAKE ACTUATOR ASSEMBLY)
- Disconnect the No. 9 global CAN junction connector.
- Measure the resistance according to the value(s) in the table below.
*1 DLC3 - - *a Front view of wire harness connector
(to No. 9 Global CAN Junction Connector)*b 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) Result
Proceed to OK NG
Result:
NG
See step 14
Result:
OK
See step 12
- CHECK FOR SHORT TO +B IN CAN BUS LINE (NO. 9 GLOBAL CAN JUNCTION CONNECTOR - ENGINE STOP AND START ECU)
- Measure the resistance according to the value(s) in the table below.
*1 DLC3 - - *a Front view of wire harness connector
(to No. 9 Global CAN Junction Connector)*b 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) Result
Proceed to OK NG
Result:
NG
See step 15
Result:
OK
See step 13
- Measure the resistance according to the value(s) in the table below.
- CHECK FOR SHORT TO +B IN CAN BUS LINE (NO. 9 GLOBAL CAN JUNCTION CONNECTOR - ECM)
- Measure the resistance according to the value(s) in the table below.
*1 DLC3 - - *a Front view of wire harness connector
(to No. 9 Global CAN Junction Connector)*b 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) Result
Proceed to OK NG
Result:
OK
REPLACE NO. 9 GLOBAL CAN JUNCTION CONNECTOR
Result:
NG
See step 16
- Measure the resistance according to the value(s) in the table below.
- CHECK FOR SHORT TO +B IN CAN BUS LINE (NO. 9 GLOBAL CAN JUNCTION CONNECTOR - BRAKE ACTUATOR ASSEMBLY)
- Disconnect the A151 brake actuator assembly connector.
- Measure the resistance according to the value(s) in the table below.
*1 DLC3 - - *a Front view of wire harness connector
(to No. 9 Global CAN Junction Connector)*b 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) Result
Proceed to OK NG
Result:
OK
REPLACE BRAKE ACTUATOR ASSEMBLY
Refer to REMOVAL [11/2022 - ]
Result:
NG
REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (NO. 9 GLOBAL CAN JUNCTION CONNECTOR - BRAKE ACTUATOR ASSEMBLY)
- CHECK FOR SHORT TO +B IN CAN BUS LINE (NO. 9 GLOBAL CAN JUNCTION CONNECTOR - ENGINE STOP AND START ECU)
- Disconnect the I230 engine stop and start ECU connector.
- Measure the resistance according to the value(s) in the table below.
*1 DLC3 - - *a Front view of wire harness connector
(to No. 9 Global CAN Junction Connector)*b 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) Result
Proceed to OK NG
Result:
OK
REPLACE ENGINE STOP AND START ECU
Refer to REMOVAL [11/2022 - ]
Result:
NG
REPAIR OR REPLACE CAN BRANCH LINE OR CONNECTOR (NO. 9 GLOBAL CAN JUNCTION CONNECTOR - ENGINE STOP AND START ECU)
- CHECK FOR SHORT TO +B IN CAN BUS LINE (NO. 9 GLOBAL CAN JUNCTION CONNECTOR - ECM)
- Disconnect the A199 ECM connector.
- Measure the resistance according to the value(s) in the table below.
*1 DLC3 - - *a Front view of wire harness connector
(to No. 9 Global CAN Junction Connector)*b 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) Result
Proceed to OK NG
Result:
OK
REPLACE ECM
Refer to REMOVAL [11/2023 - ]
Result:
NG
REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (NO. 9 GLOBAL CAN JUNCTION CONNECTOR - ECM)
- CHECK FOR SHORT IN CAN BUS LINES (NO. 9 GLOBAL CAN JUNCTION CONNECTOR - BRAKE ACTUATOR ASSEMBLY)
- Disconnect the No. 9 global CAN junction connector.
- Measure the resistance according to the value(s) in the table below.
*a Front view of wire harness connector
(to No. 9 Global CAN Junction Connector)*b 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 Result
Proceed to OK NG
Result:
NG
See step 20
Result:
OK
See step 18
- CHECK FOR SHORT IN CAN BUS LINES (NO. 9 GLOBAL CAN JUNCTION CONNECTOR - ENGINE STOP AND START ECU)
- Measure the resistance according to the value(s) in the table below.
*a Front view of wire harness connector
(to No. 9 Global CAN Junction Connector)*b 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 Result
Proceed to OK NG
Result:
NG
See step 21
Result:
OK
See step 19
- Measure the resistance according to the value(s) in the table below.
- CHECK FOR SHORT IN CAN BUS LINES (NO. 9 GLOBAL CAN JUNCTION CONNECTOR - ECM)
- Measure the resistance according to the value(s) in the table below.
*a Front view of wire harness connector
(to No. 9 Global CAN Junction Connector)*b 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 Result
Proceed to OK NG
Result:
OK
REPLACE NO. 9 GLOBAL CAN JUNCTION CONNECTOR
Result:
NG
See step 22
- Measure the resistance according to the value(s) in the table below.
- CHECK FOR SHORT IN CAN BUS LINES (NO. 9 GLOBAL CAN JUNCTION CONNECTOR - BRAKE ACTUATOR ASSEMBLY)
- Disconnect the A151 brake actuator assembly connector.
- Measure the resistance according to the value(s) in the table below.
*a Front view of wire harness connector
(to No. 9 Global CAN Junction Connector)*b 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 Result
Proceed to OK NG
Result:
OK
REPLACE BRAKE ACTUATOR ASSEMBLY
Refer to REMOVAL [11/2022 - ]
Result:
NG
REPAIR OR REPLACE CAN MAIN BUS LINES OR CONNECTOR (NO. 9 GLOBAL CAN JUNCTION CONNECTOR - BRAKE ACTUATOR ASSEMBLY)
- CHECK FOR SHORT IN CAN BUS LINES (NO. 9 GLOBAL CAN JUNCTION CONNECTOR - ENGINE STOP AND START ECU)
- Disconnect the I230 engine stop and start ECU connector.
- Measure the resistance according to the value(s) in the table below.
*a Front view of wire harness connector
(to No. 9 Global CAN Junction Connector)*b 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 Result
Proceed to OK NG
Result:
OK
REPLACE ENGINE STOP AND START ECU
Refer to REMOVAL [11/2022 - ]
Result:
NG
REPAIR OR REPLACE CAN BRANCH LINES OR CONNECTOR (NO. 9 GLOBAL CAN JUNCTION CONNECTOR - ENGINE STOP AND START ECU)
- CHECK FOR SHORT IN CAN BUS LINES (NO. 9 GLOBAL CAN JUNCTION CONNECTOR - ECM)
- Disconnect the A199 ECM connector.
- Measure the resistance according to the value(s) in the table below.
*a Front view of wire harness connector
(to No. 9 Global CAN Junction Connector)*b 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 Result
Proceed to OK NG
Result:
OK
REPLACE ECM
Refer to REMOVAL [11/2023 - ]
Result:
NG
REPAIR OR REPLACE CAN MAIN BUS LINES OR CONNECTOR (NO. 9 GLOBAL CAN JUNCTION CONNECTOR - ECM)
- CHECK FOR OPEN IN CAN MAIN BUS LINES (BRAKE ACTUATOR ASSEMBLY)
- Disconnect the brake actuator assembly connector.
- Measure the resistance according to the value(s) in the table below.
*a Front view of wire harness connector
(to Brake Actuator Assembly)Standard Resistance
Tester Connection Condition Specified Condition A151-11 (CA2H) - A151-25 (CA2L) Cable disconnected from negative (-) auxiliary battery terminal 108 to 132 Ω Result
Proceed to OK NG
Result:
OK
REPLACE BRAKE ACTUATOR ASSEMBLY
Refer to REMOVAL [11/2022 - ]
Result:
NG
See step 24
- CHECK FOR OPEN IN CAN MAIN BUS LINES (NO. 9 GLOBAL CAN JUNCTION CONNECTOR - BRAKE ACTUATOR ASSEMBLY)
- Reconnect the A151 brake actuator assembly connector.
- Disconnect the No. 9 global CAN junction connector.
- Measure the resistance according to the value(s) in the table below.
*a Front view of wire harness connector
(to No. 9 Global CAN Junction Connector)*b 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 Result
Proceed to OK NG
Result:
NG
REPAIR OR REPLACE CAN MAIN BUS LINES OR CONNECTOR (NO. 9 GLOBAL CAN JUNCTION CONNECTOR - BRAKE ACTUATOR ASSEMBLY)
Result:
OK
See step 25
- CHECK FOR OPEN IN CAN MAIN BUS LINES (NO. 9 GLOBAL CAN JUNCTION CONNECTOR - ECM)
- Measure the resistance according to the value(s) in the table below.
*a Front view of wire harness connector
(to No. 9 Global CAN Junction Connector)*b 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 Result
Proceed to OK NG
Result:
OK
REPLACE NO. 9 GLOBAL CAN JUNCTION CONNECTOR
Result:
NG
See step 26
- Measure the resistance according to the value(s) in the table below.
- CHECK FOR OPEN IN CAN MAIN BUS LINES (ECM)
- Reconnect the A193 No. 9 global CAN junction connector.
- Disconnect the ECM connector.
- Measure the resistance according to the value(s) in the table below.
Standard Resistance
Tester Connection Condition Specified Condition A199-6 (CACH) - A199-7 (CACL) Cable disconnected from negative (-) auxiliary battery terminal 108 to 132 Ω *a Front view of wire harness connector
(to ECM)Result
Proceed to OK NG
Result:
OK
REPLACE ECM
Refer to REMOVAL [11/2023 - ]
Result:
NG
REPAIR OR REPLACE CAN MAIN BUS LINES OR CONNECTOR (NO. 9 GLOBAL CAN JUNCTION CONNECTOR - ECM)