Toyota RAV4 Service Manual: Open in can main wire

Description

There may be an open circuit in the can main wire and / or the dlc3 branch wire when the resistance between terminals 6 (canh) and 14 (canl) of the dlc3 is 69 ù or more.

Wiring diagram

Inspection procedure

Notice:

• Turn the ignition switch off before measuring the resistances of the main wire and the 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 for at least 1 minute and do not operate the ignition switch, any switches or 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

1. Measure the resistance of the dlc3.

Standard resistance

Notice:

When the measured value is 132 ù or more 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" (see page ca-8) after repairing the trouble area.

2. Check can main wire for disconnection (no. 2 Junction connector - ecm)

1. Disconnect the e68 no. 2 Junction connector.
2. Measure the resistance of the wire harness side connector.

Standard resistance

3. Check can main wire for disconnection (no. 2 Junction connector - combination meter ecu)

1. Measure the resistance of the wire harness side connector.

Standard resistance

Replace no. 2 Junction connector

4. Connect connector

1. Reconnect the e68 no. 2 Junction connector.

5. Check can main wire for disconnection (no. 1 Junction connector - ecm)

1. Disconnect the a36 no. 1 Junction connector.
2. Measure the resistance of the wire harness side connector.

Standard resistance

6. Check can main wire for disconnection (no. 1 Junction connector - no. 2 Junction connector)

1. Measure the resistance of the wire harness side connector.

Standard resistance

Replace no. 1 Junction connector

7. Connect connector

1. Reconnect the a36 no. 1 Junction connector.

8. Check can main wire for disconnection (ecm - no. 1 Junction connector)

1. Disconnect the a9 ecm connector.
2. Measure the resistance of the wire harness side connector.

Standard resistance

Replace ecm

9. Connect connector

1. Reconnect the e68 no. 2 Junction connector.

10. Check can main wire for disconnection (no. 4 Junction connector - no. 2 Junction connector)

1. Disconnect the e69 no. 4 Junction connector.
2. Measure the resistance of the wire harness side connector.

Standard resistance

11. Check can main wire for disconnection (no. 4 Junction connector - combination meter)

1. Measure the resistance of the wire harness side connector.

Standard resistance

Replace no. 4 Junction connector

12. Connect connector

1. Reconnect the e69 no. 4 Junction connector.

13. Check can main bus line for disconnection (combination meter ecu - no. 4 Junction connector)

1. Disconnect the e19 combination meter ecu connector.
2. Measure the resistance of the wire harness side connector.

Standard resistance

Replace combination meter assembly (combination meter ecu)

14. Connect connector

1. Reconnect the e69 no. 4 Junction connector.

15. Check can main wire for disconnection (no. 2 Junction connector - no. 3 Junction connector)

1. Disconnect the e70 no. 3 Junction connector.
2. Measure the resistance of the wire harness side connector.

Standard resistance

16. Check can main wire for disconnection (no. 3 Junction connector - no. 4 Junction connector)

1. Measure the resistance of the wire harness side connector.

Standard resistance

Replace no. 3 Junction connector