Open in CAN Main Bus Line
CAN COMMUNICATION SYSTEM: Open in CAN Main Bus Line
Open in CAN Main Bus Line
DESCRIPTION
There may be an open circuit in the CAN main bus line and/or the DLC3 branch line when the resistance between terminals 6 (CANH) and 14 (CANL) of the DLC3 is 69 Ohms or more.
WIRING DIAGRAM
INSPECTION PROCEDURE
PROCEDURE
1. CHECK DLC3
(a) Turn the engine switch off.
(b) Measure the resistance according to the value(s) in the table below.
Standard resistance:
NOTE: When the measured value is 132 Ohms or more and a CAN communication system diagnostic trouble code 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" How to Proceed With Troubleshooting after repairing the trouble area.
B -- REPAIR OR REPLACE DLC3 BRANCH LINE OR CONNECTOR (CANH, CANL)
A -- Continue to next step.
2. CHECK FOR OPEN IN CAN BUS MAIN WIRE (CAN BUS CHECK)
(a) Perform "CAN Bus Check" using the Techstream Diagnosis System.
Result:
C -- CHECK FOR OPEN IN CAN BUS MAIN WIRE (ECM - CAN LH J/C)
B -- CHECK FOR OPEN IN CAN BUS MAIN WIRE (GATEWAY ECU - CAN LH J/C)
A -- Continue to next step.
3. CHECK FOR OPEN IN CAN BUS MAIN WIRE (ECM - CAN LH J/C)
(a) Turn the engine switch off.
(b) Disconnect the ECM connector (A5).
(c) Measure the resistance according to the value(s) in the table below.
Standard resistance:
NG -- REPAIR OR REPLACE CAN BUS MAIN WIRE OR CONNECTOR (ECM - CAN LH J/C)
OK -- REPLACE ECM
4. CHECK FOR OPEN IN CAN BUS MAIN WIRE (GATEWAY ECU - CAN LH J/C)
(a) Turn the engine switch off.
(b) Disconnect the gateway ECU connector (J76).
(c) Measure the resistance according to the value(s) in the table below.
Standard resistance:
OK -- REPLACE GATEWAY ECU
NG -- Continue to next step.
5. RECONNECT CONNECTOR
(a) Reconnect the gateway ECU connector (J76).
NEXT -- Continue to next step.
6. CHECK FOR OPEN IN CAN BUS MAIN WIRE (CAN RH J/C - GATEWAY ECU)
(a) Disconnect the CAN main bus line connector (J84) from the CAN RH J/C B side (without earth terminal).
- Before disconnecting the connector, make a note of where it is connected.
- Reconnect the connector to its original position.
(b) Measure the resistance according to the value(s) in the table below.
Standard resistance:
NG -- REPAIR OR REPLACE CAN BUS MAIN WIRE OR CONNECTOR (CAN RH J/C - GATEWAY ECU)
OK -- REPAIR OR REPLACE CAN BUS MAIN WIRE OR CONNECTOR (CAN LH J/C - CAN RH J/C)
7. CHECK FOR OPEN IN CAN BUS MAIN WIRE (ECM - CAN LH J/C)
(a) Turn the engine switch off.
(b) Disconnect the ECM connector (A5).
(c) Measure the resistance according to the value(s) in the table below.
Standard resistance:
OK -- REPLACE ECM
NG -- Continue to next step.
8. RECONNECT CONNECTOR
(a) Reconnect the ECM connector (A5).
NEXT -- Continue to next step.
9. CHECK FOR OPEN IN CAN BUS MAIN WIRE (GATEWAY ECU - CAN LH J/C)
(a) Disconnect the gateway ECU connector (J76).
(b) Measure the resistance according to the value(s) in the table below.
Standard resistance:
OK -- REPLACE GATEWAY ECU
NG -- Continue to next step.
10. RECONNECT CONNECTOR
(a) Reconnect the gateway ECU connector (J76).
NEXT -- Continue to next step.
11. CHECK FOR OPEN IN CAN BUS MAIN WIRE (CAN RH J/C - GATEWAY ECU)
(a) Disconnect the CAN main bus line connector (J84) from the CAN RH J/C B side (without earth terminal).
- Before disconnecting the connector, make a note of where it is connected.
- Reconnect the connector to its original position.
(b) Measure the resistance according to the value(s) in the table below.
Standard resistance:
NG -- REPAIR OR REPLACE CAN BUS MAIN WIRE OR CONNECTOR (CAN RH J/C - GATEWAY ECU)
OK -- Continue to next step.
12. RECONNECT CONNECTOR
(a) Reconnect the CAN main bus line connector (J84) to the CAN RH J/C B side (without earth terminal).
NEXT -- Continue to next step.
13. CHECK FOR OPEN IN CAN BUS MAIN WIRE (ECM - CAN LH J/C)
(a) Disconnect the CAN main bus line connector (J2) from the CAN LH J/C A side (with earth terminal).
(b) Measure the resistance according to the value(s) in the table below.
Standard resistance:
NG -- REPAIR OR REPLACE CAN BUS MAIN WIRE OR CONNECTOR (ECM - CAN LH J/C)
OK -- REPAIR OR REPLACE CAN BUS MAIN WIRE OR CONNECTOR (CAN LH J/C - CAN RH J/C)