Toyota Yaris: Can Communication System / Main Body ECU Communication Stop Mode

Toyota Yaris XP210 (2020-2022) Reapir and Service Manual / Power Source & Network / Networking / Can Communication System / Main Body ECU Communication Stop Mode

DESCRIPTION

Detection Item

Symptom

Trouble Area

Main Body ECU Communication Stop Mode

Communication stop for "Main Body" is indicated on the "Communication Bus Check" screen of the GTS.

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  • Main body ECU (multiplex network body ECU) main line or connector
  • Power source circuit of main body ECU (multiplex network body ECU) or power distribution box assembly
  • Main body ECU (multiplex network body ECU) or power distribution box assembly ground circuit
  • Main body ECU (multiplex network body ECU) or power distribution box assembly

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, 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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  • Inspect the fuses for circuits related to this system before performing the following procedure.
  • Before replacing the main body ECU (multiplex network body ECU), 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 BUS LINES (MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) MAIN LINE)

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

(b) Disconnect the main body ECU (multiplex network body ECU) connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

H4-2 (CANH) - H4-1 (CANL)

Cable disconnected from negative (-) auxiliary battery terminal

108 to 132 Ω

*a

Front view of wire harness connector

(to Main Body ECU (Multiplex Network Body ECU))

NG

REPAIR OR REPLACE CAN MAIN BUS LINES OR CONNECTOR (MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU))

OK

2.

CHECK HARNESS AND CONNECTOR (POWER SOURCE CIRCUIT)

(a) Remove the main body ECU (multiplex network body ECU).

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

MB-13 (GND1) - Body ground

Cable disconnected from negative (-) auxiliary battery terminal

Below 1 Ω

MB-14 (GND2) - Body ground

Cable disconnected from negative (-) auxiliary battery terminal

Below 1 Ω

NOTICE:

Perform this inspection with the wire harness connected to the power distribution box assembly.

*a

Front view of wire harness connector

(to Main Body ECU (Multiplex Network Body ECU))

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

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

MB-26 (BECU) - Body ground

Ignition switch off

11 to 14 V

MB-27 (IGR) - Body ground

Ignition switch ON

11 to 14 V

MB-27 (IGR) - Body ground

Ignition switch off

Below 1 V

NOTICE:

Perform this inspection with the wire harness connected to the power distribution box assembly.

Result

Proceed to

OK

A

NG (BECU)

B

NG (IGR)

C

NG (GND1)

D

NG (GND2)

E

A

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

C

GO TO LIGHTING (INT) SYSTEM (IG SIGNAL CIRCUIT)

D

GO TO STEP 4

E

GO TO STEP 5

B

3.

CHECK HARNESS AND CONNECTOR (BECU SIGNAL CIRCUIT)

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

(b) Disconnect the power distribution box assembly connector.

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

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

4D-23 - Body ground

Ignition switch off

11 to 14 V

*a

Front view of wire harness connector

(to Instrument Panel Junction Block Assembly)

OK

REPLACE POWER DISTRIBUTION BOX ASSEMBLY

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR (BECU SIGNAL CIRCUIT)

4.

CHECK HARNESS AND CONNECTOR (GROUND CIRCUIT)

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

(b) Disconnect the power distribution box assembly connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

4B-36 - Body ground

Cable disconnected from negative (-) auxiliary battery terminal

Below 1 Ω

*a

Front view of wire harness connector

(to Instrument Panel Junction Block Assembly)

OK

REPLACE POWER DISTRIBUTION BOX ASSEMBLY

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR (GROUND CIRCUIT)

5.

CHECK HARNESS AND CONNECTOR (GROUND CIRCUIT)

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

(b) Disconnect the power distribution box assembly connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

4C-41 - Body ground

Cable disconnected from negative (-) auxiliary battery terminal

Below 1 Ω

*a

Front view of wire harness connector

(to Instrument Panel Junction Block Assembly)

OK

REPLACE POWER DISTRIBUTION BOX ASSEMBLY

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR (GROUND CIRCUIT)

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