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 one of the CAN V1 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.
WIRING DIAGRAM
INSPECTION PROCEDURE
NOTICE:
* Turn the power switch off before measuring the resistances between CAN main bus lines and between CAN branch lines.
* Turn the power switch off before inspecting CAN bus lines for a ground short.
* After the power switch is turned off, check that the key reminder warning system and light reminder warning system are not operating.
* Before measuring the resistance, leave the vehicle as is for at least 1 minute and do not operate the power switch, any other switches or the doors. If any doors need to be opened in order to check connectors, open the doors and leave them open.
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.
PROCEDURE
1. CHECK FOR OPEN IN CAN BUS LINES (DLC3 BRANCH LINE)
(a) Turn the power switch off.
(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)
(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)
OK -- REPLACE ECM Removal
3. CHECK FOR OPEN IN CAN BUS LINES (COMBINATION METER ASSEMBLY)
(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 NO. 2 J/C)
OK -- REPLACE COMBINATION METER ASSEMBLY Removal
4. CHECK FOR OPEN IN CAN BUS LINES (CAN NO. 2 J/C)
(a) Reconnect the combination meter assembly connector.
(b) Disconnect the wire harness connector from the CAN No. 2 junction connector rear side.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Text in Illustration
Result:
B -- CHECK FOR OPEN IN CAN BUS LINES (CAN NO. 2 J/C - CAN NO. 1 J/C)
C -- CHECK FOR OPEN IN CAN BUS LINES (CAN NO. 3 J/C)
A -- REPLACE CAN NO. 2 JUNCTION CONNECTOR
5. CHECK FOR OPEN IN CAN BUS LINES (CAN NO. 2 J/C - CAN NO. 1 J/C)
(a) Reconnect the wire harness connector to the CAN No. 2 junction connector rear side.
(b) Disconnect the instrument panel wire from the CAN No. 1 junction connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Text in Illustration
NG -- REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (CAN NO. 1 J/C - CAN NO. 2 J/C)
OK -- Continue to next step.
6. CHECK FOR OPEN IN CAN BUS LINES (CAN NO. 1 J/C - ECM)
(a) Disconnect the engine room main wire from the CAN No. 1 junction connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Text in Illustration
NG -- REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (CAN NO. 1 J/C - ECM)
OK -- REPLACE CAN NO. 1 JUNCTION CONNECTOR
7. CHECK FOR OPEN IN CAN BUS LINES (CAN NO. 3 J/C)
(a) Reconnect the wire harness connector to the CAN No. 2 junction connector rear side.
(b) Disconnect the instrument panel wire from the CAN No. 3 junction connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Text in Illustration
Result:
B -- REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (CAN NO. 2 J/C - CAN NO. 3 J/C)
C -- REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (CAN NO. 3 J/C - COMBINATION METER ASSEMBLY)
A -- REPLACE CAN NO. 3 JUNCTION CONNECTOR