Last Modified: 01-27-2025 6.11:8.1.0 Doc ID: RM1000000028AC4
Model Year Start: 2023 Model: GR Corolla Prod Date Range: [11/2022 -           ]
Title: NETWORKING: CAN COMMUNICATION SYSTEM (for Gasoline Model): Check Bus 7 Line; 2023 - 2025 MY Corolla Corolla Hatchback GR Corolla [11/2022 -        ]

Check Bus 7 Line

DESCRIPTION

Symptom

Trouble Area

There are ECUs or sensors that display a communication stop on the bus diagnostic screen. Or, there are ECUs or sensors that display communication stop history on the "Detail" screen.
  • CAN main bus line or connector
  • Central gateway ECU (network gateway ECU)
  • Option connector (bus buffer ECU)
  • CAN compatible optional devices

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 (-) battery terminal and leave the vehicle for 10 minutes or more before measuring the resistance.
  • After the ignition switch is turned off, there may be a waiting time before disconnecting the negative (-) battery terminal.

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  • When disconnecting and reconnecting the battery.

    HINT:

    When disconnecting and reconnecting the 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.

    Click here 2023 MY Corolla Corolla Hatchback GR Corolla [11/2022 - 03/2023]; NETWORKING: CAN COMMUNICATION SYSTEM (for Gasoline Model): DIAGNOSIS SYSTEM 2023 MY Corolla Corolla Hatchback GR Corolla [03/2023 - 08/2023]; NETWORKING: CAN COMMUNICATION SYSTEM (for Gasoline Model): DIAGNOSIS SYSTEM 2024 - 2025 MY Corolla Corolla Hatchback GR Corolla [08/2023 - 09/2024]; NETWORKING: CAN COMMUNICATION SYSTEM (for Gasoline Model): DIAGNOSIS SYSTEM 2025 MY Corolla Corolla Hatchback GR Corolla [09/2024 -        ]; NETWORKING: CAN COMMUNICATION SYSTEM (for Gasoline Model): DIAGNOSIS SYSTEM

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 (-) battery terminal.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

I173-5 (CA8H) - I173-6 (CA8L)

Cable disconnected from negative (-) battery terminal

Below 70 Ω

*a

Component with harness connected

(Central Gateway ECU (Network Gateway ECU))
NG

GO TO STEP 11

OK

2.

CHECK FOR SHORT IN CAN BUS LINES

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

I173-5 (CA8H) - I173-6 (CA8L)

Cable disconnected from negative (-) battery terminal

54 Ω or higher

*a

Component with harness connected

(Central Gateway ECU (Network Gateway ECU))
NG

GO TO STEP 9

OK

3.

CHECK FOR SHORT TO +B IN CAN BUS LINE

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

*1

DLC3

-

-

*a

Component with harness connected

(Central Gateway ECU (Network Gateway ECU))

-

-

Standard Resistance:

Tester Connection

Condition

Specified Condition

I173-5 (CA8H) - I26-16 (BAT)

Cable disconnected from negative (-) battery terminal

6 kΩ or higher

I173-6 (CA8L) - I26-16 (BAT)
NG

GO TO STEP 7

OK

4.

CHECK FOR SHORT TO GND IN CAN BUS LINE

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

*1

DLC3

-

-

*a

Component with harness connected

(Central Gateway ECU (Network Gateway ECU))

-

-

Standard Resistance:

Tester Connection

Condition

Specified Condition

I173-5 (CA8H) - I26-4 (CG)

Cable disconnected from negative (-) battery terminal

200 Ω or higher

I173-6 (CA8L) - I26-4 (CG)
OK

REPLACE CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU)

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NG

5.

CHECK FOR SHORT TO GND IN CAN BUS LINE (CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU))

(a) Disconnect the I173 central gateway ECU (network gateway ECU) connector.

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

*1

DLC3

-

-

*a

Front view of wire harness connector

(to Central Gateway ECU (Network Gateway ECU))

-

-

Standard Resistance:

Tester Connection

Condition

Specified Condition

I173-5 (CA8H) - I26-4 (CG)

Cable disconnected from negative (-) battery terminal

200 Ω or higher

I173-6 (CA8L) - I26-4 (CG)
OK

REPLACE CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU)

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NG

6.

CHECK FOR SHORT TO GND IN CAN BUS LINE (OPTION CONNECTOR (BUS BUFFER ECU))

(a) Disconnect the I174 option connector (bus buffer ECU) connector.

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

*1

DLC3

-

-

*a

Front view of wire harness connector

(to Option Connector (Bus Buffer ECU))

-

-

Standard Resistance:

Tester Connection

Condition

Specified Condition

I174-2 (CAN+) - I26-4 (CG)

Cable disconnected from negative (-) battery terminal

200 Ω or higher

I174-1 (CAN-) - I26-4 (CG)
OK

REPAIR OR REPLACE CAN COMPATIBLE OPTIONAL DEVICES
NG

REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (OPTION CONNECTOR (BUS BUFFER ECU) - CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU))

7.

CHECK FOR SHORT TO +B IN CAN BUS LINE (CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU))

(a) Disconnect the I173 central gateway ECU (network gateway ECU) connector.

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

*1

DLC3

-

-

*a

Front view of wire harness connector

(to Central Gateway ECU (Network Gateway ECU))

-

-

Standard Resistance:

Tester Connection

Condition

Specified Condition

I173-5 (CA8H) - I26-16 (BAT)

Cable disconnected from negative (-) battery terminal

6 kΩ or higher

I173-6 (CA8L) - I26-16 (BAT)
OK

REPLACE CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU)

Click here 2023 - 2025 MY Corolla Corolla Hatchback Corolla HV GR Corolla [11/2022 - 09/2024]; NETWORKING: NETWORK GATEWAY ECU: REMOVAL 2025 MY Corolla Corolla Hatchback Corolla HV GR Corolla [09/2024 -        ]; NETWORKING: NETWORK GATEWAY ECU: REMOVAL

NG

8.

CHECK FOR SHORT TO +B IN CAN BUS LINE (OPTION CONNECTOR (BUS BUFFER ECU))

(a) Disconnect the I174 option connector (bus buffer ECU) connector.

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

*1

DLC3

-

-

*a

Front view of wire harness connector

(to Option Connector (Bus Buffer ECU))

-

-

Standard Resistance:

Tester Connection

Condition

Specified Condition

I174-2 (CAN+) - I26-16 (BAT)

Cable disconnected from negative (-) battery terminal

6 kΩ or higher

I174-1 (CAN-) - I26-16 (BAT)
OK

REPAIR OR REPLACE CAN COMPATIBLE OPTIONAL DEVICES
NG

REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (OPTION CONNECTOR (BUS BUFFER ECU) - CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU))

9.

CHECK FOR SHORT IN CAN BUS LINES (CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU))

(a) Disconnect the I173 central gateway ECU (network gateway ECU) connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

I173-5 (CA8H) - I173-6 (CA8L)

Cable disconnected from negative (-) battery terminal

108 to 132 Ω

*a

Front view of wire harness connector

(to Central Gateway ECU (Network Gateway ECU))
OK

REPLACE CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU)

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NG

10.

CHECK FOR SHORT IN CAN BUS LINES (OPTION CONNECTOR (BUS BUFFER ECU))

(a) Reconnect the I173 central gateway ECU (network gateway ECU) connector.

(b) Disconnect the I174 option connector (bus buffer ECU) connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

I174-2 (CAN+) - I174-1 (CAN-)

Cable disconnected from negative (-) battery terminal

108 to 132 Ω

*a

Front view of wire harness connector

(to Option Connector (Bus Buffer ECU))
OK

REPAIR OR REPLACE CAN COMPATIBLE OPTIONAL DEVICES
NG

REPAIR OR REPLACE CAN MAIN BUS LINES OR CONNECTOR (OPTION CONNECTOR (BUS BUFFER ECU) - CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU))

11.

CHECK FOR OPEN IN CAN MAIN BUS LINES (CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU))

(a) Disconnect the I173 central gateway ECU (network gateway ECU) connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

I173-5 (CA8H) - I173-6 (CA8L)

Cable disconnected from negative (-) battery terminal

108 to 132 Ω

*a

Front view of wire harness connector

(to Central Gateway ECU (Network Gateway ECU))
OK

REPLACE CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU)

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NG

12.

CHECK FOR OPEN IN CAN MAIN BUS LINES (OPTION CONNECTOR (BUS BUFFER ECU))

(a) Reconnect the I173 central gateway ECU (network gateway ECU) connector.

(b) Disconnect the I174 option connector (bus buffer ECU) connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

I174-2 (CAN+) - I174-1 (CAN-)

Cable disconnected from negative (-) battery terminal

108 to 132 Ω

*a

Front view of wire harness connector

(to Option Connector (Bus Buffer ECU))
OK

REPAIR OR REPLACE CAN COMPATIBLE OPTIONAL DEVICES
NG

REPAIR OR REPLACE CAN MAIN BUS LINES OR CONNECTOR (OPTION CONNECTOR (BUS BUFFER ECU) - CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU))