DESCRIPTION
WIRING DIAGRAM
INSPECTION PROCEDURE
CHECK DLC3
CHECK FOR OPEN IN CAN MAIN BUS LINE (BUS CHECK)
CHECK FOR OPEN IN CAN MAIN BUS LINE (GATEWAY ECU - CAN RH J/C)
CHECK FOR OPEN IN CAN MAIN BUS LINE (ECM - CAN RH J/C)
RECONNECT CONNECTOR
CHECK FOR OPEN IN CAN MAIN BUS LINE (CAN LH J/C - ECM)
CHECK FOR OPEN IN CAN MAIN BUS LINE (ECM - CAN LH J/C)
RECONNECT CONNECTOR
CHECK FOR OPEN IN CAN MAIN BUS LINE (GATEWAY ECU - CAN LH J/C)
RECONNECT CONNECTOR
CHECK FOR OPEN IN CAN MAIN BUS LINE (CAN RH J/C - GATEWAY ECU)
RECONNECT CONNECTOR
CHECK FOR OPEN IN CAN MAIN BUS LINE (ECM - CAN LH J/C)
2AD-FHV CAN COMMUNICATION SYSTEM (for RHD) - 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 Ω or more.
| Symptom | Trouble Area |
| The resistance between terminals 6 (CANH) and 14 (CANL) of the DLC3 is 69 Ω or more. | CAN main bus line or connector
CAN LH J/C
CAN RH J/C
DLC3 branch line or connector
|
WIRING DIAGRAM
INSPECTION PROCEDURE
Turn the engine switch off.
Measure the resistance according to the value(s) in the table below.
- Standard resistance:
| Tester Connection | Condition | Specified Value | Result |
| J21-6 (CANH) -J21-14 (CANL) | Engine switch off | 108 to 132 Ω | A |
| J21-6 (CANH) - J21-14 (CANL) | Engine switch off | 132 Ω or higher | B |
- When the measured value is 132 Ω or higher 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" ( ) after repairing the trouble area.
| 3.CHECK FOR OPEN IN CAN MAIN BUS LINE (GATEWAY ECU - CAN RH J/C) |
Turn the engine switch off.
Disconnect the gateway ECU connector (J76).
Measure the resistance according to the value(s) in the table below.
- Standard resistance:
| Tester Connection | Condition | Specified Value |
| J76-17 (CA1H) - J76-18 (CA1L) | Engine switch off | 108 to 132 Ω |
| | REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (CAN RH J/C - GATEWAY ECU) |
|
|
| 4.CHECK FOR OPEN IN CAN MAIN BUS LINE (ECM - CAN RH J/C) |
Turn the engine switch off.
Disconnect the ECM connector (A49).
Measure the resistance according to the value(s) in the table below.
- Standard resistance:
| Tester Connection | Condition | Specified Value |
| A49-38 (CANH) - A49-46 (CANL) | Engine switch off | 108 to 132 Ω |
Reconnect the ECM connector (A49).
| 6.CHECK FOR OPEN IN CAN MAIN BUS LINE (CAN LH J/C - ECM) |
Disconnect the CAN main bus line connector (J2) from the CAN LH J/C B side (with earth terminal).
Measure the resistance according to the value(s) in the table below.
- Standard resistance:
| Tester Connection | Condition | Specified Value |
| J2-1 (CANH) - J2-2 (CANL) | Engine switch off | 108 to 132 Ω |
| | REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (ECM - CAN LH J/C) |
|
|
| OK | |
| |
| REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (CAN LH J/C - CAN RH J/C) |
|
| 7.CHECK FOR OPEN IN CAN MAIN BUS LINE (ECM - CAN LH J/C) |
Turn the engine switch off.
Disconnect the ECM connector (A49).
Measure the resistance according to the value(s) in the table below.
- Standard resistance:
| Tester Connection | Condition | Specified Value |
| A49-38 (CANH) - A49-46 (CANL) | Engine switch off | 108 to 132 Ω |
Reconnect the ECM connector (A49).
| 9.CHECK FOR OPEN IN CAN MAIN BUS LINE (GATEWAY ECU - CAN LH J/C) |
Disconnect the gateway ECU connector (J76).
Measure the resistance according to the value(s) in the table below.
- Standard resistance:
| Tester Connection | Condition | Specified Value |
| J76-17 (CA1H) - J76-18 (CA1L) | Engine switch off | 108 to 132 Ω |
Reconnect the gateway ECU connector (J76).
| 11.CHECK FOR OPEN IN CAN MAIN BUS LINE (CAN RH J/C - GATEWAY ECU) |
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.
Measure the resistance according to the value(s) in the table below.
- Standard resistance:
| Tester Connection | Condition | Specified Value |
| J84-1 (CANH) - J84-2 (CANL) | Engine switch off | 108 to 132 Ω |
| | REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (CAN RH J/C - GATEWAY ECU) |
|
|
Reconnect the CAN main bus line connector (J84) to the CAN RH J/C B side (without earth terminal).
| 13.CHECK FOR OPEN IN CAN MAIN BUS LINE (ECM - CAN LH J/C) |
Disconnect the CAN main bus line connector (J2) from the CAN LH J/C A side (with earth terminal).
Measure the resistance according to the value(s) in the table below.
- Standard resistance:
| Tester Connection | Condition | Specified Value |
| J2-1 (CANH) - J2-2 (CANL) | Engine switch off | 108 to 132 Ω |
| | REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (ECM - CAN LH J/C) |
|
|
| OK | |
| |
| REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (CAN LH J/C - CAN RH J/C) |
|
LEXUS IS250, IS220d / GSE20 ALE20
