CAN Bus Line
Circuit diagnosis
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 DISCONNECTION, BUS LINES FOR SHORT CIRCUIT) |
Turn the ignition switch off.
Measure the resistance according to the value(s) in the table below.
- Result:
Tester Connection
Condition
Specified Value
Proceed to
D1-6 (CANH) - D1-14 (CANL)
Disconnect the negative auxiliary battery cable
54 to 69 Ω
OK
D1-6 (CANH) - D1-14 (CANL)
Disconnect the negative auxiliary battery cable
69 Ω or higher
NG-A
D1-6 (CANH) - D1-14 (CANL)
Disconnect the negative auxiliary battery cable
54 Ω or less
NG-B
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| OK | |
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| 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
D1-6 (CANH) - D1-16 (BAT)
Disconnect the negative auxiliary battery cable
1 MΩ or higher
D1-14 (CANL) - D1-16 (BAT)
Disconnect the negative auxiliary battery cable
1 MΩ or higher
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| OK | |
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| 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
D1-4 (CG) - D1-6 (CANH)
Disconnect the negative auxiliary battery cable
1 kΩ or higher
D1-4 (CG) - D1-14 (CANL)
Disconnect the negative auxiliary battery cable
1 kΩ or higher
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| OK | ||
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