Diagnosis Item
25: Short to power supply or earth, open circuit or line-to-line short in the CAN-B bus lines
| caution |
When servicing a CAN bus line,
earth yourself by touching a metal object such as an unpainted water pipe. If you fail to do,
a component connected to the CAN bus line may be broken.
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FUNCTION
TROUBLE JUDGEMENT CONDITIONS
TROUBLESHOOTING HINTS
- Malfunction of the connector (short to power supply or earth in connector
or improperly connected)
- Malfunction of the wiring harness (short to power supply or earth, open circuit
or line-to-line short in CAN bus lines)
- Faulty ECU(s) (internal short to power supply or earth)
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STEP 1. Checking short to earth (resistance measurement)
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| note |
This check determines whether there is a short to earth in the CAN-B bus line. If a short
to earth is present in either the CAN_H or CAN_L line, check the appropriate
line only.
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| caution |
- Disconnect the negative battery terminal. For
details refer to
 .
- A digital multimeter should be used. For details refer to .
- The test wiring harness should be used. For details refer to .
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(1)Disconnect C-411 ETACS-ECU connector, and measure at the wiring harness side.
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(2)Measure the resistance between C-411 ETACS-ECU connector terminal No.6 and body
earth. <CAN_H>
OK: 1 kΩ or more
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(3)Measure the resistance between C-411 ETACS-ECU connector terminal No.7 and body
earth. <CAN_L>
OK: 1 kΩ or more
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Q.
Is the check result normal?
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 Go to Step 8.
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 Go to Step 2.
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STEP 2. Check the wiring harness between C-126 SRS connector and C-05
joint connector (CAN1) for short to earth (resistance measurement).
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| caution |
- Disconnect the negative battery terminal. For
details refer to .
- A digital multimeter should be used. For details refer to .
- The test wiring harness should be used. For details refer to .
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(1)Disconnect joint connector (CAN1), and measure at the wiring harness side.
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(2)Measure the resistance between C-05 joint connector (CAN1) terminal No.10 and body
earth.
OK: 1 kΩ or more
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(3)Measure the resistance between C-05 joint connector (CAN1) terminal No.21 and body
earth.
OK: 1 kΩ or more
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Q.
Is the check result normal?
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Go to Step 3.
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Go to Step 28.
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STEP 3. Check the wiring harness between C-237 heater control panel <vehicles
without A/C> or C-216 A/C control panel <vehicles with A/C> connector
and C-05 joint connector (CAN1) for short to earth (resistance measurement).
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| caution |
- Disconnect the negative battery terminal. For
details refer to .
- A digital multimeter should be used. For details refer to .
- The test wiring harness should be used. For details refer to .
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(1)Disconnect joint connector (CAN1), and measure at the wiring harness side.
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(2)Measure the resistance between C-05 joint connector (CAN1) terminal No.6 and body
earth.
OK: 1 kΩ or more
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(3)Measure the resistance between C-05 joint connector (CAN1) terminal No.17 and body
earth.
OK: 1 kΩ or more
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Q.
Is the check result normal?
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Go to Step 4.
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Go to Step 29.
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STEP 4. Check the wiring harness between C-203 combination meter connector
and C-05 joint connector (CAN1) for short to earth (resistance measurement).
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| caution |
- Disconnect the negative battery terminal. For
details refer to .
- A digital multimeter should be used. For details refer to .
- The test wiring harness should be used. For details refer to .
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(1)Disconnect joint connector (CAN1), and measure at the wiring harness side.
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(2)Measure the resistance between C-05 joint connector (CAN1) terminal No.7 and body
earth.
OK: 1 kΩ or more
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(3)Measure the resistance between C-05 joint connector (CAN1) terminal No.18 and body
earth.
OK: 1 kΩ or more
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Q.
Is the check result normal?
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Go to Step 5.
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Go to Step 30.
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STEP 5. Check the wiring harness between C-09 WCM connector <vehicles
without KOS> or C-10 KOS-ECU connector <vehicles with KOS> and C-05
joint connector (CAN1) for short to earth (resistance measurement).
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| caution |
- Disconnect the negative battery terminal. For
details refer to .
- A digital multimeter should be used. For details refer to .
- The test wiring harness should be used. For details refer to .
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(1)Disconnect joint connector (CAN1), and measure at the wiring harness side.
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(2)Measure the resistance between C-05 joint connector (CAN1) terminal No.9 and body
earth.
OK: 1 kΩ or more
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(3)Measure the resistance between C-05 joint connector (CAN1) terminal No.20 and body
earth.
OK: 1 kΩ or more
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Q.
Is the check result normal?
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YES <vehicles with KOS> : Go to Step 6.
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YES <vehicles without KOS> : Go to Step 7.
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NO <the check result is not normal. (vehicles without KOS)> : Go to Step 31.
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NO <the check result is not normal. (vehicles with KOS)> : Go to Step 32.
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STEP 6. Check the wiring harness between C-14 OSS-ECU connector and
C-05 joint connector (CAN1) for short to earth (resistance measurement).
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| caution |
- Disconnect the negative battery terminal. For
details refer to .
- A digital multimeter should be used. For details refer to .
- The test wiring harness should be used. For details refer to .
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(1)Disconnect joint connector (CAN1), and measure at the wiring harness side.
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(2)Measure the resistance between C-05 joint connector (CAN1) terminal No.5 and body
earth.
OK: 1 kΩ or more
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(3)Measure the resistance between C-05 joint connector (CAN1) terminal No.16 and body
earth.
OK: 1 kΩ or more
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Q.
Is the check result normal?
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Go to Step 7.
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Go to Step 33.
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STEP 7. Check the wiring harness between C-411 ETACS-ECU connector
and C-05 joint connector (CAN1) for short to earth (resistance measurement).
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| caution |
- Disconnect the negative battery terminal. For
details refer to .
- A digital multimeter should be used. For details refer to .
- The test wiring harness should be used. For details refer to .
- Strictly observe the specified wiring harness repair procedure. For details refer
to .
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(1)Disconnect ETACS-ECU connector and joint connector (CAN1), and measure at the wiring
harness side.
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(2)Measure the resistance between C-05 joint connector (CAN1) terminal No.11 and body
earth.
OK: 1 kΩ or more
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(3)Measure the resistance between C-05 joint connector (CAN1) terminal No.22 and body
earth.
OK: 1 kΩ or more
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Q.
Is the check result normal?
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Go to Step 34.
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Repair the wiring harness between C-411 ETACS-ECU connector and C-05 joint connector
(CAN1).
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STEP 8. Checking short to power supply (voltage measurement)
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| note |
This check determines whether there is a short to power supply in the CAN-B bus line.
If a failure is present in either the CAN_H or CAN_L line, check the appropriate
line only.
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| caution |
- A digital multimeter should be used. For details
refer to .
- The test wiring harness should be used. For details refer to .
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(1)Disconnect C-411 ETACS-ECU connector, and measure at the wiring harness side.
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(2)Turn the ignition switch to the ON position.
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(3)Measure the voltage between C-411 ETACS-ECU connector terminal No.6 and body earth. <CAN_H>
OK: 5 V or less
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(4)Measure the voltage between C-411 ETACS-ECU connector terminal No.7 and body earth. <CAN_L>
OK: 5 V or less
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Q.
Is the check result normal?
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Go to Step 15.
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Go to Step 9.
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STEP 9. Check the wiring harness between C-126 SRS connector and C-05
joint connector (CAN1) for short to power supply (voltage measurement).
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| caution |
- A digital multimeter should be used. For details
refer to .
- The test wiring harness should be used. For details refer to .
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(1)Disconnect joint connector (CAN1), and measure at the wiring harness side.
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(2)Turn the ignition switch to the ON position.
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(3)Measure the voltage between C-05 joint connector (CAN1) terminal No.10 and body
earth. <CAN_H>
OK: 5 V or less
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(4)Measure the voltage between C-05 joint connector (CAN1) terminal No.21 and body
earth. <CAN_L>
OK: 5 V or less
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Q.
Is the check result normal?
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Go to Step 10.
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Go to Step 28.
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STEP 10. Check the wiring harness between C-237 heater control panel <vehicles
without A/C> or C-216 A/C control panel <vehicles with A/C> connector
and C-05 joint connector (CAN1) for short to power supply (voltage measurement).
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| caution |
- A digital multimeter should be used. For details
refer to .
- The test wiring harness should be used. For details refer to .
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(1)Disconnect joint connector (CAN1), and measure at the wiring harness side.
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(2)Turn the ignition switch to the ON position.
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(3)Measure the voltage between C-05 joint connector (CAN1) terminal No.6 and body
earth.
OK: 5 V or less
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(4)Measure the voltage between C-05 joint connector (CAN1) terminal No.17 and body
earth.
OK: 5 V or less
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Q.
Is the check result normal?
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Go to Step 11.
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Go to Step 29.
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STEP 11. Check the wiring harness between C-203 combination meter
connector and C-05 joint connector (CAN1) for short to power supply (voltage measurement).
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| caution |
- A digital multimeter should be used. For details
refer to .
- The test wiring harness should be used. For details refer to .
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(1)Disconnect joint connector (CAN1), and measure at the wiring harness side.
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(2)Turn the ignition switch to the ON position.
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(3)Measure the voltage between C-05 joint connector (CAN1) terminal No.7 and body
earth.
OK: 5 V or less
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(4)Measure the voltage between C-05 joint connector (CAN1) terminal No.18 and body
earth.
OK: 5 V or less
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Q.
Is the check result normal?
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Go to Step 12.
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Go to Step 30.
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STEP 12. Check the wiring harness between C-09 WCM connector <vehicles
without KOS> or C-10 KOS-ECU connector <vehicles with KOS> and C-05
joint connector (CAN1) for short to power supply (voltage measurement).
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| caution |
- A digital multimeter should be used. For details
refer to .
- The test wiring harness should be used. For details refer to .
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(1)Disconnect joint connector (CAN1), and measure at the wiring harness side.
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(2)Turn the ignition switch to the ON position.
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(3)Measure the voltage between C-05 joint connector (CAN1) terminal No.9 and body
earth.
OK: 5 V or less
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(4)Measure the voltage between C-05 joint connector (CAN1) terminal No.20 and body
earth.
OK: 5 V or less
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Q.
Is the check result normal?
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YES <vehicles with KOS> : Go to Step 13.
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YES <vehicles without KOS> : Go to Step 14.
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NO <the check result is not normal. (vehicles without KOS)> : Go to Step 31.
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NO <the check result is not normal. (vehicles with KOS)> : Go to Step 32.
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STEP 13. Check the wiring harness between C-14 OSS-ECU connector and
C-05 joint connector (CAN1) for short to power supply (voltage measurement).
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| caution |
- A digital multimeter should be used. For details
refer to .
- The test wiring harness should be used. For details refer to .
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(1)Disconnect joint connector (CAN1), and measure at the wiring harness side.
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(2)Turn the ignition switch to the ON position.
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(3)Measure the voltage between C-05 joint connector (CAN1) terminal No.5 and body
earth.
OK: 5 V or less
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(4)Measure the voltage between C-05 joint connector (CAN1) terminal No.16 and body
earth.
OK: 5 V or less
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Q.
Is the check result normal?
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Go to Step 14.
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Go to Step 33.
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STEP 14. Check the wiring harness between C-411 ETACS-ECU connector
and C-05 joint connector (CAN1) for short to power supply (voltage measurement).
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| caution |
- A digital multimeter should be used. For details
refer to .
- The test wiring harness should be used. For details refer to .
- Strictly observe the specified wiring harness repair procedure. For details refer
to .
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(1)Disconnect ETACS-ECU connector and joint connector (CAN1), and measure at the wiring
harness side.
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(2)Turn the ignition switch to the ON position.
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(3)Measure the voltage between C-05 joint connector (CAN1) terminal No.11 and body
earth.
OK: 1 V or less
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(4)Measure the voltage between C-105 joint connector (CAN1) terminal No.22 and body
earth.
OK: 1 V or less
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Q.
Is the check result normal?
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Go to Step 34.
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Repair the wiring harness between C-411 ETACS-ECU connector and C-05 joint connector
(CAN1).
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STEP 15. Checking line-to-line short
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| caution |
- Disconnect the negative battery terminal. For
details refer to .
- A digital multimeter should be used. For details refer to .
- The test wiring harness should be used. For details refer to .
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(1)Disconnect C-411 ETACS-ECU connector, and check that there is continuity at the
harness side.
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(2)Check that there is continuity between C-411 ETACS-ECU connector terminal Nos.6
and 7.
OK: 1 kΩ or more
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Q.
Is the check result normal?
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Go to Step 22.
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Go to Step 16.
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STEP 16. Check the wiring harness between C-126 SRS connector and
C-05 joint connector (CAN1) for line-to-line short.
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| caution |
- Disconnect the negative battery terminal. For
details refer to .
- A digital multimeter should be used. For details refer to .
- The test wiring harness should be used. For details refer to .
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(1)Disconnect joint connector (CAN1), and check that there is continuity at the harness
side.
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(2)Check that there is continuity between C-05 joint connector terminal Nos.10 and
21.
OK: 1 kΩ or more
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Q.
Is the check result normal?
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Go to Step 17.
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Go to Step 28.
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STEP 17. Check the wiring harness between C-237 heater control panel <vehicles
without A/C> or C-216 A/C control panel <vehicles with A/C> connector
and C-05 joint connector (CAN1) for line-to-line short.
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| caution |
- Disconnect the negative battery terminal. For
details refer to .
- A digital multimeter should be used. For details refer to .
- The test wiring harness should be used. For details refer to .
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(1)Disconnect joint connector (CAN1), and check that there is continuity at the harness
side.
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(2)Check that there is continuity between C-05 joint connector terminal Nos.6 and
17.
OK: 1 kΩ or more
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Q.
Is the check result normal?
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Go to Step 18.
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Go to Step 29.
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STEP 18. Check the wiring harness between C-203 combination meter
connector and C-05 joint connector (CAN1) for line-to-line short.
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| caution |
- Disconnect the negative battery terminal. For
details refer to .
- A digital multimeter should be used. For details refer to .
- The test wiring harness should be used. For details refer to .
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(1)Disconnect joint connector (CAN1), and check that there is continuity at the harness
side.
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(2)Check that there is continuity between C-05 joint connector terminal Nos.7 and
18.
OK: 1 kΩ or more
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Q.
Is the check result normal?
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Go to Step 19.
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Go to Step 30.
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STEP 19. Check the wiring harness between C-09 WCM connector <vehicles
without KOS> or C-10 KOS-ECU connector <vehicles with KOS> and C-15
joint connector (CAN1) for line-to-line short.
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| caution |
- Disconnect the negative battery terminal. For
details refer to .
- A digital multimeter should be used. For details refer to .
- The test wiring harness should be used. For details refer to .
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(1)Disconnect joint connector (CAN1), and check that there is continuity at the harness
side.
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(2)Check that there is continuity between C-05 joint connector terminal Nos.9 and
20.
OK: 1 kΩ or more
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Q.
Is the check result normal?
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YES <vehicles with KOS> : Go to Step 20.
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YES <vehicles without KOS> : Go to Step 21.
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NO <the check result is not normal. (vehicles without KOS)> : Go to Step 31.
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NO <the check result is not normal. (vehicles with KOS)> : Go to Step 32.
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STEP 20. Check the wiring harness between C-14 OSS-ECU connector and
C-05 joint connector (CAN1) for line-to-line short.
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| caution |
- Disconnect the negative battery terminal. For
details refer to .
- A digital multimeter should be used. For details refer to .
- The test wiring harness should be used. For details refer to .
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(1)Disconnect joint connector (CAN1), and check that there is continuity at the harness
side.
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(2)Check that there is continuity between C-05 joint connector terminal Nos.5 and
16.
OK: 1 kΩ or more
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Q.
Is the check result normal?
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Go to Step 21.
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Go to Step 33.
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STEP 21. Check the wiring harness between C-411 ETACS-ECU connector
and C-05 joint connector (CAN1) for line-to-line short.
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| caution |
- Disconnect the negative battery terminal. For
details refer to .
- A digital multimeter should be used. For details refer to .
- The test wiring harness should be used. For details refer to .
- Strictly observe the specified wiring harness repair procedure. For details refer
to .
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(1)Disconnect joint connector (CAN1), and check that there is continuity at the harness
side.
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(2)Check that there is continuity between C-05 joint connector terminal Nos.11 and
22.
OK: 1 kΩ or more
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Q.
Is the check result normal?
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Go to Step 33.
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Repair the wiring harness between C-411 ETACS-ECU connector and C-05 joint connector
(CAN1).
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STEP 22. Check the wiring harness between C-126 SRS-ECU connector
and C-05 joint connector (CAN1) for open circuit.
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(1)Disconnect SRS-ECU connector and joint connector (CAN1), and check the following
wiring harness.
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(2)Check that there is continuity between C-126 SRS-ECU connector terminal No.29/30
and C-05 joint connector (CAN1) terminal No.21/10
OK: Continuity exists (2 Ω or less)
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Q.
Is the check result normal?
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Go to Step 23.
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Repair the wiring harness between C-126 SRS-ECU connector and C-05 joint connector
(CAN1).
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STEP 23. Check the wiring harness between C-237 heater control panel <vehicles
without A/C> or C-216 A/C control panel <vehicles with A/C> connector
and C-05 joint connector (CAN1) for open circuit.
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(1)Disconnect heater control panel <vehicles without A/C> or A/C
control panel <vehicles with A/C> connector and joint connector (CAN1), and
check the following wiring harness.
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(2)Check that there is continuity between C-237 heater control panel <vehicles
without A/C> or C-216 A/C control panel <vehicles with A/C> connector
terminal No.7/8 and C-05 joint connector (CAN1) terminal No.6/17
OK: Continuity exists (2 Ω or less)
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Q.
Is the check result normal?
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Go to Step 24.
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Repair the wiring harness between C-237 heater control panel <vehicles
without A/C> or C-216 A/C control panel <vehicles with A/C> connector
and C-05 joint connector (CAN1).
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STEP 24. Check the wiring harness between C-203 combination meter
connector and C-05 joint connector (CAN1) for open circuit.
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(1)Disconnect combination meter connector and joint connector (CAN1), and check the
wiring harness.
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(2)Check that there is continuity between C-203 combination meter connector terminal
No.14/15 and C-05 joint connector (CAN1) terminal No.7/18
OK: Continuity exists (2 Ω or less)
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Q.
Is the check result normal?
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Go to Step 25.
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Repair the wiring harness between C-203 combination meter connector and C-05 joint connector
(CAN1).
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STEP 25. Check the wiring harness between C-09 WCM connector <vehicles
without KOS> or C-10 KOS-ECU connector <vehicles with KOS> and C-05
joint connector (CAN1) for open circuit.
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(1)Disconnect WCM connector <vehicles without KOS> or KOS-ECU connector <vehicles
with KOS> and joint connector (CAN1), and check the following wiring harness.
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(2)Check that there is continuity between C-09 WCM connector terminal No.3/2 and C-05
joint connector (CAN1) terminal No.9/20 <vehicles without KOS>
OK: Continuity exists (2 Ω or less)
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(3)Check that there is continuity between C-10 KOS-ECU connector terminal No.3/2 and
C-05 joint connector (CAN1) terminal No.9/20 <vehicles with KOS>
OK: Continuity exists (2 Ω or less)
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Q.
Is the check result normal?
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YES <vehicles with KOS> : Go to Step 26.
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YES <vehicles without KOS> : Go to Step 27.
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NO (the check result is not normal.) : Repair the wiring harness between C-09 WCM connector <vehicles without
KOS> or C-10 KOS-ECU connector <vehicles with KOS> and C-05 joint
connector (CAN1).
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STEP 26. Check the wiring harness between C-14 OSS-ECU connector and
C-05 joint connector (CAN1) for open circuit.
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(1)Disconnect OSS-ECU connector and joint connector (CAN1), and check the following
wiring harness.
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(2)Check that there is continuity between C-14 OSS-ECU connector terminal No.1/14
and C-05 joint connector (CAN1) terminal No.5/16
OK: Continuity exists (2 Ω or less)
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Q.
Is the check result normal?
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Go to Step 27.
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Repair the wiring harness between C-14 OSS-ECU connector and C-05 joint connector
(CAN1).
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STEP 27 Check the wiring harness between C-411 ETACS-ECU connector
and C-05 joint connector (CAN1) for open circuit.
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| caution |
Strictly observe the specified wiring harness repair procedure.
For details refer to .
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(1)Disconnect ETACS-ECU connector and joint connector (CAN1), and check the following
wiring harness.
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(2)Check that there is continuity between C-411 ETACS-ECU connector terminal No.6/7
and C-05 joint connector (CAN1) terminal No.11/22
OK: Continuity exists (2 Ω or less)
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Q.
Is the check result normal?
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Go to Step 34.
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Repair the wiring harness between C-411 ETACS-ECU connector and C-05 joint connector
(CAN1).
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STEP 28. M.U.T.-III CAN bus diagnostics (checking the SRS-ECU for
internal failure)
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| caution |
Strictly observe the specified wiring harness repair procedure.
For details refer to .
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Disconnect C-126 SRS-ECU connector, and diagnose the CAN bus line.
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OK: The display of the M.U.T.-III is as shown in the figure.
Q.
Does M.U.T.-III screen correspond to the illustration?
Repair the wiring harness between C-126 SRS-ECU connector and C-05 joint connector
(CAN1).
Check the SRS-ECU connector, and repair if necessary. If the SRS-ECU connector
is in good condition, replace the SRS-ECU.
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STEP 29. M.U.T.-III CAN bus diagnostics (checking the heater control
panel <vehicles without A/C> or A/C control panel <vehicles with
A/C> for internal failure)
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| caution |
Strictly observe the specified wiring harness repair procedure.
For details refer to .
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Disconnect C-237 heater control panel <vehicles without A/C> or C-216
A/C control panel <vehicles with A/C> connector, and diagnose the CAN bus
line.
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OK: The display of the M.U.T.-III is as shown in the figure.
Q.
Does M.U.T.-III screen correspond to the illustration?
Repair the wiring harness between C-237 heater control panel <vehicles
without A/C> or C-216 A/C control panel <vehicles with A/C> connector
and C-05 joint connector (CAN1).
Check the heater control panel <vehicles without A/C> or A/C
control panel <vehicles with A/C> connector, and repair if necessary. If the
heater control panel <vehicles without A/C> or A/C control panel <vehicles
with A/C> connector is in good condition, replace the heater control panel <vehicles without
A/C> or A/C control panel <vehicles with A/C>.
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STEP 30. M.U.T.-III CAN bus diagnostics (checking the combination
meter for internal failure)
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| caution |
Strictly observe the specified wiring harness repair procedure.
For details refer to .
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Disconnect C-203 combination meter connector, and diagnose the CAN bus line.
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OK: The display of the M.U.T.-III is as shown in the figure.
Q.
Does M.U.T.-III screen correspond to the illustration?
Repair the wiring harness between C-203 combination meter connector and C-05 joint connector
(CAN1).
Check the combination meter connector, and repair if necessary. If the combination
meter connector is in good condition, replace the combination meter.
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STEP 31. M.U.T.-III CAN bus diagnostics (checking the WCM for internal
failure)
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| caution |
Strictly observe the specified wiring harness repair procedure.
For details refer to .
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Disconnect C-09 WCM connector, and diagnose the CAN bus line.
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OK: The display of the M.U.T.-III is as shown in the figure.
Q.
Does M.U.T.-III screen correspond to the illustration?
Repair the wiring harness between C-09 WCM connector and C-05 joint connector
(CAN1).
Check the WCM connector, and repair if necessary. If the WCM connector is in good
condition, replace the WCM.
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STEP 32. M.U.T.-III CAN bus diagnostics (checking the KOS-ECU for
internal failure)
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| caution |
Strictly observe the specified wiring harness repair procedure.
For details refer to .
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Disconnect C-10 KOS-ECU connector, and diagnose the CAN bus line.
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OK: The display of the M.U.T.-III is as shown in the figure.
Q.
Does M.U.T.-III screen correspond to the illustration?
Repair the wiring harness between C-10 KOS-ECU connector and C-05 joint connector
(CAN1).
Check the KOS-ECU connector, and repair if necessary. If the KOS-ECU connector
is in good condition, replace the KOS-ECU.
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STEP 33. M.U.T.-III CAN bus diagnostics (checking the OSS-ECU for
internal failure)
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| caution |
Strictly observe the specified wiring harness repair procedure.
For details refer to .
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Disconnect C-14 OSS-ECU connector, and diagnose the CAN bus line.
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OK: The display of the M.U.T.-III is as shown in the figure.
Q.
Does M.U.T.-III screen correspond to the illustration?
Repair the wiring harness between C-14 OSS-ECU connector and C-05 joint connector
(CAN1).
Check the OSS-ECU connector, and repair if necessary. If the OSS-ECU connector
is in good condition, replace the OSS-ECU.
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STEP 34. Trouble symptom check
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Diagnose the CAN bus line, and check that normal condition is displayed.
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Q.
Is the check result normal?
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The trouble can be an intermittent malfunction (Refer to GROUP 00 - How
to use Troubleshooting/inspection Service Points - How to Cope with Intermittent
Malfunction ).
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Check the ETACS-ECU connector, and repair if necessary. If the ETACS-ECU connector
is in good condition, replace the ETACS-ECU.
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