DESCRIPTION
WIRING DIAGRAM
INSPECTION PROCEDURE
CHECK CAN BUS LINE (MAIN BUS LINE FOR OPEN, BUS LINES FOR SHORT CIRCUIT)
CHECK CAN BUS LINE (SHORT TO B+ IN CAN BUS LINE)
CHECK CAN BUS LINE (SHORT TO GND IN CAN BUS LINE)
2AD-FHV CAN COMMUNICATION SYSTEM (for LHD) - CAN Bus Line
DESCRIPTION
When any DTC for the CAN communication system is output, first measure the resistance between the terminals of the DLC3 to specify the trouble area. Then check that there is no short in the CAN main bus line, between the CAN bus lines, to B+, or to GND.
WIRING DIAGRAM
INSPECTION PROCEDURE
| 1.CHECK CAN BUS LINE (MAIN BUS LINE FOR OPEN, BUS LINES FOR SHORT CIRCUIT) |
Turn the engine switch off.
Measure the resistance according to the value(s) in the table below.
- Standard resistance:
| Tester Connection | Condition | Specified Value |
| J21-6 (CANH) - J21-14 (CANL) | Engine switch off | 54 to 69 Ω |
- Result:
| Result | Proceed to | See Procedure |
| OK | A | - |
| 69 Ω or higher | B |
|
| Below 54 Ω | C |
|
| | OPEN IN CAN MAIN BUS LINE |
|
|
| |
|
| 2.CHECK CAN BUS LINE (SHORT TO B+ IN CAN BUS LINE) |
Measure the resistance according to the value(s) in the table below.
- Standard resistance:
| Tester Connection | Condition | Specified Value |
| J21-6 (CANH) - J21-16 (BAT) | Engine switch off | 1 MΩ or higher |
| J21-14 (CANL) - J21-16 (BAT) | Engine switch off | 1 MΩ or higher |
- Result:
| Result | See Procedure |
| OK | Go to step 3 |
| NG |
|
| | SHORT TO B+ IN CAN BUS LINE |
|
|
| 3.CHECK CAN BUS LINE (SHORT TO GND IN CAN BUS LINE) |
Measure the resistance according to the value(s) in the table below.
- Standard resistance:
| Tester Connection | Condition | Specified Value |
| J21-4 (CG) - J21-6 (CANH) | Engine switch off | 1 kΩ or higher |
| J21-4 (CG) - J21-14 (CANL) | Engine switch off | 1 kΩ or higher |
| | SHORT TO GND IN CAN BUS LINE |
|
|
| OK | |
| |
| GO TO "HOW TO PROCEED WITH TROUBLESHOOTING" |
|
LEXUS IS250, IS220d / GSE20 ALE20
