Toyota Avalon Service & Repair Manual: Check Bus 2 Line for Short to +B

DESCRIPTION

There may be a short circuit between one of the CAN bus lines and +B when there is no resistance between terminal 18 (CA4H) of the central gateway ECU (network gateway ECU) and terminal 16 (BAT) of the DLC3, or terminal 17 (CA4L) of the central gateway ECU (network gateway ECU) and terminal 16 (BAT) of the DLC3.

Symptom

Trouble Area

There is no resistance between terminal 18 (CA4H) of the central gateway ECU (network gateway ECU) and terminal 16 (BAT) of the DLC3, or terminal 17 (CA4L) of the central gateway ECU (network gateway ECU) and terminal 16 (BAT) of the DLC3.

  • Short to +B in CAN main bus line
  • Central gateway ECU (network gateway ECU)
  • ECM
  • No. 2 CAN junction connector
  • No. 4 CAN junction connector

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.

    Click here

  • Before measuring the resistance of the CAN bus, turn the engine 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 engine 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 here

  • After performing repairs, perform the DTC check procedure and confirm that the DTCs are not output again.

    DTC check procedure: Turn the engine switch on (IG) 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

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 SHORT TO +B IN CAN BUS LINE (NO. 2 CAN JUNCTION CONNECTOR)

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

(b) Disconnect the A49 No. 2 CAN junction connector.

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

*1

DLC3

-

-

*a

Front view of wire harness connector

(to No. 2 CAN Junction Connector)

*b

to No. 4 CAN Junction Connector

*c

to ECM

-

-

Standard Resistance:

Tester Connection

Condition

Specified Condition

Connected to

A49-10 (CANH) - G45-16 (BAT)

Cable disconnected from negative (-) battery terminal

6 kΩ or higher

No. 4 CAN junction connector

A49-21 (CANL) - G45-16 (BAT)

A49-11 (CANH) - G45-16 (BAT)

Cable disconnected from negative (-) battery terminal

6 kΩ or higher

ECM

A49-22 (CANL) - G45-16 (BAT)

Result

Proceed to

OK

A

NG (Line to ECM)

B

NG (Line to No. 4 CAN junction connector)

C

A

REPLACE NO. 2 CAN JUNCTION CONNECTOR

C

GO TO STEP 3

B

2.

CHECK FOR SHORT TO +B IN CAN BUS LINE (NO. 2 CAN JUNCTION CONNECTOR - ECM)

(a) Disconnect the A18 ECM connector.

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

*1

DLC3

-

-

*a

Front view of wire harness connector

(to No. 2 CAN Junction Connector)

*b

to ECM

Standard Resistance:

Tester Connection

Condition

Specified Condition

A49-11 (CANH) - G45-16 (BAT)

Cable disconnected from negative (-) battery terminal

6 kΩ or higher

A49-22 (CANL) - G45-16 (BAT)

Result

Proceed to

OK

A

NG

B

A

REPLACE ECM

B

REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (NO. 2 CAN JUNCTION CONNECTOR - ECM)

3.

CHECK FOR SHORT TO +B IN CAN BUS LINE (NO. 4 CAN JUNCTION CONNECTOR - NO. 2 CAN JUNCTION CONNECTOR)

(a) Disconnect the G96 No. 4 CAN junction connector.

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

*1

DLC3

-

-

*a

Front view of wire harness connector

(to No. 4 CAN Junction Connector)

*b

to No. 2 CAN Junction Connector

Standard Resistance:

Tester Connection

Condition

Specified Condition

G96-11 (CANH) - G45-16 (BAT)

Cable disconnected from negative (-) battery terminal

6 kΩ or higher

G96-22 (CANL) - G45-16 (BAT)

NG

REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (NO. 4 CAN JUNCTION CONNECTOR - NO. 2 CAN JUNCTION CONNECTOR)

OK

4.

CHECK FOR SHORT TO +B IN CAN BUS LINE (NO. 4 CAN JUNCTION CONNECTOR)

(a) Disconnect the G95 No. 4 CAN junction connector.

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

*1

DLC3

-

-

*a

Front view of wire harness connector

(to No. 4 CAN Junction Connector)

*b

to Central Gateway ECU (Network Gateway ECU)

Standard Resistance:

Tester Connection

Condition

Specified Condition

G95-1 (CANH) - G45-16 (BAT)

Cable disconnected from negative (-) battery terminal

6 kΩ or higher

G95-12 (CANL) - G45-16 (BAT)

OK

REPLACE NO. 4 CAN JUNCTION CONNECTOR

NG

5.

CHECK FOR SHORT TO +B IN CAN BUS LINE (NO. 4 CAN JUNCTION CONNECTOR - CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU))

(a) Disconnect the G52 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 No. 4 CAN Junction Connector)

*b

to Central Gateway ECU (Network Gateway ECU)

Standard Resistance:

Tester Connection

Condition

Specified Condition

G95-1 (CANH) - G45-16 (BAT)

Cable disconnected from negative (-) battery terminal

6 kΩ or higher

G95-12 (CANL) - G45-16 (BAT)

OK

REPLACE CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU)

NG

REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (NO. 4 CAN JUNCTION CONNECTOR - CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU))

    Check Bus 1 Lines for Short Circuit

    Check Bus 2 Line for Short to GND

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