Open in CAN Main Bus Line
NETWORKING: CAN COMMUNICATION SYSTEM: Open in CAN Main Bus Line
- Open in CAN Main Bus Line
DESCRIPTION
There may be an open circuit in one of the V bus main lines and/or a DLC3 branch line when the resistance between terminals 6 (CANH) and 14 (CANL) of the DLC3 is 70 Ohms or higher.
This malfunction is not related to the lines of a CAN main bus branch or to ECUs or sensors connected a CAN main bus branch.
WIRING DIAGRAM
INSPECTION PROCEDURE
NOTICE:
* Before measuring the resistance of the CAN bus, turn the power switch off and leave the vehicle for 1 minute or more without operating the key, 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 turning the power switch off, waiting time may be required before disconnecting the cable from the negative (-) auxiliary battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) auxiliary battery terminal notices before proceeding with work Service Precautions.
* 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 How to Proceed With Troubleshooting.
* After performing repairs, perform the DTC check procedure and confirm that the DTCs are not output again.
* DTC check procedure: Turn the power switch on (IG), wait for at least 60 seconds and then drive the vehicle at a speed of 20 km/h (12 mph) or more for at least 11 seconds.
* After the repair, perform CAN Bus Check and check that all the ECUs and sensors connected to the CAN communication system are displayed Diagnosis System.
HINT
* Operating the power switch, any other switches or a door triggers related ECU and sensor communication on the CAN. This communication will cause the resistance value to change.
* Even after DTCs are cleared, if a DTC is stored again after driving the vehicle for a while, the malfunction may be occurring due to vibration of the vehicle. In such a case, wiggling the ECUs or wire harness while performing the inspection below may help determine the cause of the malfunction.
* Connectors that connect to the CAN junction connector can be distinguished by color of their CAN bus lines. When the connectors have been disconnected from the CAN junction connector, reconnecting the connectors to non-original positions on the CAN junction connector does not affect system performance. However, it is preferred to reconnect the connectors to their original positions to avoid negative effects on the wiring such as tension on the wiring harnesses, and to make future maintenance easier.
PROCEDURE
1. CHECK FOR OPEN IN CAN BUS LINES (DLC3 BRANCH LINE)
(a) Disconnect the cable from the negative (-) auxiliary battery terminal.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Text in Illustration
NOTICE:
When the measured value is 133 Ohms or higher and a CAN communication system DTC is output, there may be a fault besides disconnection of the DLC3 branch line. For that reason, troubleshooting should be performed again from How to Proceed with Troubleshooting after repairing the trouble area How to Proceed With Troubleshooting.
NG -- REPAIR OR REPLACE CAN BRANCH LINE CONNECTED TO DLC3
OK -- Continue to next step.
2. CHECK FOR OPEN IN CAN BUS LINES (ECM - CAN J/C RH)
(a) Disconnect the ECM connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Text in Illustration
NG -- CHECK FOR OPEN IN CAN BUS LINES (COMBINATION METER ASSEMBLY - CAN J/C LH)
OK -- REPLACE ECM Removal
3. CHECK FOR OPEN IN CAN BUS LINES (COMBINATION METER ASSEMBLY - CAN J/C LH)
(a) Reconnect the ECM connector.
(b) Disconnect the combination meter assembly connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Text in Illustration
NG -- CHECK FOR OPEN IN CAN BUS LINES (CAN J/C LH)
OK -- REPLACE COMBINATION METER ASSEMBLY Removal
4. CHECK FOR OPEN IN CAN BUS LINES (CAN J/C LH)
(a) Reconnect the combination meter assembly connector.
(b) Disconnect the CAN junction LH connectors (I93 and I94).
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Wiring Color:
Text in Illustration
NOTICE:
* Before disconnecting the connectors, make a note of where they are connected.
* Reconnect each connector to its original position.
Result:
B -- REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (CAN J/C LH - COMBINATION METER ASSEMBLY)
C -- CHECK FOR OPEN IN CAN BUS LINES (CAN J/C RH)
A -- REPLACE CAN JUNCTION LH CONNECTOR
5. CHECK FOR OPEN IN CAN BUS LINES (CAN J/C RH)
(a) Reconnect the CAN junction LH connector (I93 and I94).
(b) Disconnect the CAN junction RH connectors (I101 and I104).
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Wiring Color:
Text in Illustration
NOTICE:
* Before disconnecting the connectors, make a note of where they are connected.
* Reconnect each connector to its original position.
Result:
B -- REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (CAN J/C LH - CAN J/C RH)
C -- REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (CAN J/C RH - ECM)
A -- REPLACE CAN JUNCTION RH CONNECTOR