Networking. Can Communication System (For Hatchback With Separate Type Yaw Rate Sensor) Open In Can Main Bus Line

There may be an open circuit in the CAN main wire and/or DLC3 branch wire when the resistance between terminals 6 (CANH) and 14 (CANL) of the DLC3 is 69 Ω or higher.

Symptom	Trouble Area
The resistance between terminals 6 (CANH) and 14 (CANL) of the DLC3 is 69 Ω or higher.	CAN main wire or connector No. 1 junction connector No. 2 junction connector ECM Combination meter assembly DLC3 branch wire or connector

WIRING DIAGRAM

Yaris. Ncp93, 131.Networking.Can Communication System (For Sedan).Can Communication System (For Hatchback With Separate Type Yaw Rate Sensor) Open In Can Main Bus Line

INSPECTION PROCEDURE

NOTICE:

Turn the ignition switch off before measuring the resistances of the CAN main wire and the CAN branch wire.
After the ignition switch is turned off, check that the key reminder warning system and light reminder warning system are not in operation.
Before measuring the resistance, leave the vehicle as is for at least 1 minute and do not operate the ignition switch, any other switches or the doors. If doors need to be opened in order to check connectors, open the doors and leave them open.

HINT:

Operating the ignition switch, any switches or any doors triggers related ECU and sensor communication with the CAN, which causes resistance variation.

1.CHECK DLC3

Turn the ignition switch off.

Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection
Switch Condition
Specified Condition
D102-6 (CANH) - D102-14 (CANL)
Ignition switch off
108 to 132 Ω
Text in Illustration
*a
Front view of DLC3
HINT:
When the measured value is 133 Ω or higher and a CAN communication system diagnostic trouble code is output, there may be a fault besides disconnection of the DLC3 branch wire. For that reason, troubleshooting should be performed again from "How to Proceed with Troubleshooting" (YARIS_NCP93 RM000001RSO066X.html) after repairing the trouble area.

Text in Illustration
*a	Front view of DLC3

REPAIR OR REPLACE CAN BUS BRANCH WIRE OR CONNECTOR (DLC3 BRANCH WIRE)

OK

2.CHECK CAN MAIN WIRE OR CONNECTOR (NO. 2 JUNCTION CONNECTOR)

Disconnect the D147 No. 2 junction connector.

Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection
Switch Condition
Specified Condition
D147-10 (CANH) - D147-21 (CANL)
Ignition switch off
108 to 132 Ω
Text in Illustration
*a
Rear view of wire harness connector
(to No. 2 Junction Connector)

Text in Illustration
*a	Rear view of wire harness connector (to No. 2 Junction Connector)

Go to step 7

OK

3.CONNECT CONNECTOR

Reconnect the D147 No. 2 junction connector.

NEXT

4.CHECK CAN MAIN WIRE OR CONNECTOR (COMBINATION METER ASSEMBLY)

Disconnect the D100 combination meter assembly connector.

Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection
Switch Condition
Specified Condition
D100-32 (CANH) - D100-31 (CANL)
Ignition switch off
108 to 132 Ω
Text in Illustration
*a
Front view of wire harness connector
(to Combination Meter Assembly)

Text in Illustration
*a	Front view of wire harness connector (to Combination Meter Assembly)

Go to step 5

REPLACE COMBINATION METER ASSEMBLY (YARIS_NCP93 RM0000035EJ00BX.html)

5.CONNECT CONNECTOR

Reconnect the D100 combination meter assembly connector.

NEXT

6.CHECK CAN MAIN WIRE OR CONNECTOR (NO. 2 JUNCTION CONNECTOR - COMBINATION METER ASSEMBLY)

Disconnect the D147 No. 2 junction connector.

Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection
Switch Condition
Specified Condition
D147-7 (CANH) - D147-18 (CANL)
Ignition switch off
108 to 132 Ω
Text in Illustration
*a
Rear view of wire harness connector
(to No. 2 Junction Connector)

Text in Illustration
*a	Rear view of wire harness connector (to No. 2 Junction Connector)

REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR (NO. 2 JUNCTION CONNECTOR - COMBINATION METER ASSEMBLY)

REPLACE NO. 2 JUNCTION CONNECTOR

7.CONNECT CONNECTOR

Reconnect the D147 No. 2 junction connector.

NEXT

8.CHECK CAN MAIN WIRE OR CONNECTOR (ECM)

Disconnect the A72 ECM connector.

Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection
Switch Condition
Specified Condition
A72-13 (CANH) - A72-26 (CANL)
Ignition switch off
108 to 132 Ω
Text in Illustration
*a
Front view of wire harness connector
(to ECM)
Result
Result
Proceed to
NG
A
OK
B

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

Result
Result	Proceed to
NG	A
OK	B

REPLACE ECM (YARIS_NCP93 RM000001CN002IX.html)

A

9.CONNECT CONNECTOR

Reconnect the A72 ECM connector.

NEXT

10.CHECK CAN MAIN WIRE OR CONNECTOR (NO. 1 JUNCTION CONNECTOR - ECM)

Disconnect the A73 and D146 No. 1 junction connector.

Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection
Switch Condition
Specified Condition
A73-9 (CANH) - A73-20 (CANL)
Ignition switch off
108 to 132 Ω
Text in Illustration
*a
Rear view of wire harness connector
(to No. 1 Junction Connector)

REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR (ECM - NO. 1 JUNCTION CONNECTOR)

OK

11.CHECK CAN MAIN WIRE OR CONNECTOR (NO. 1 JUNCTION CONNECTOR - NO. 2 JUNCTION CONNECTOR)

Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection
Switch Condition
Specified Condition
D146-4 (CANH) - D146-15 (CANL)
Ignition switch off
108 to 132 Ω
Text in Illustration
*a
Rear view of wire harness connector
(to No. 1 Junction Connector)

REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR (NO. 1 JUNCTION CONNECTOR - NO. 2 JUNCTION CONNECTOR)

REPLACE NO. 1 JUNCTION CONNECTOR

Tester Connection	Switch Condition	Specified Condition
D102-6 (CANH) - D102-14 (CANL)	Ignition switch off	108 to 132 Ω