Can Communication System Check Can Bus Line (Lhd Models)
DESCRIPTION
WIRING DIAGRAM
INSPECTION PROCEDURE
CHECK CAN BUS MAIN LINE (MAIN BUS LINE FOR DISCONNECTION, BUS LINES FOR SHORT CIRCUIT)
CHECK CAN BUS LINE FOR SHORT TO +B
CHECK CAN BUS LINE FOR SHORT TO GND
CAN COMMUNICATION SYSTEM - Check CAN Bus Line (LHD Models) |
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, and 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 MAIN LINE (MAIN BUS LINE FOR DISCONNECTION, 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
| Result
|
L16-6 (CANH) - L16-14 (CANL)
| Engine switch off
| 54 to 69 Ω
| OK
|
L16-6 (CANH) - L16-14 (CANL)
| Engine switch off
| 69 Ω or more
| NG-A
|
L16-6 (CANH) - L16-14 (CANL)
| Engine switch off
| 54 Ω or less
| NG-B
|
| | CHECK CAN MAIN BUS LINE FOR DISCONNECTION |
|
|
| | CHECK CAN BUS LINES FOR SHORT CIRCUIT |
|
|
| 2.CHECK CAN BUS LINE FOR SHORT TO +B |
Measure the resistance according to the value(s) in the table below.
- Standard resistance:
Tester Connection
| Condition
| Specified Value
|
L16-6 (CANH) - L16-16 (BAT)
| Engine switch off
| 1 MΩ or more
|
L16-14 (CANL) - L16-16 (BAT)
| Engine switch off
| 1 MΩ or more
|
| | CHECK CAN BUS LINE FOR SHORT TO +B |
|
|
| 3.CHECK CAN BUS LINE FOR SHORT TO GND |
Measure the resistance according to the value(s) in the table below.
- Standard resistance:
Tester Connection
| Condition
| Specified Value
|
L16-6 (CANH) - L16-16 (BAT)
| Engine switch off
| 1 MΩ or more
|
L16-14 (CANL) - L16-16 (BAT)
| Engine switch off
| 1 MΩ or more
|
| | CHECK CAN BUS LINE FOR SHORT TO GND |
|
|
| OK |
|
|
|
| HOW TO PROCEED WITH TROUBLESHOOTING |
|
