Diagnosis Item
3: Diagnose shorts in the earth to CAN bus line. <Vehicles for
GCC>
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.
|
TROUBLE JUDGEMENT CONDITIONS
The M.U.T.-III judges the trouble
when it is impossible to receive the periodically sent
data and the voltage of CAN_H or CAN_L line is less than 1.0
V.
TROUBLESHOOTING HINTS
- Malfunction of the wiring harness
- Malfunction of the connector
- Malfunction of the ETACS-ECU
- Malfunction of the combination meter
- Malfunction of the SRS-ECU
- Malfunction of the EPS-ECU
- Malfunction of the ASC-ECU
- Malfunction of the steering wheel sensor
- Malfunction of the CVT-ECU
- Malfunction of the engine-ECU
|
STEP 1. Check the CAN bus lines. Resistance measurement
at diagnosis connector.
|
|
caution |
- A digital multimeter should
be used. For details refer to service precautions.
- The test wiring harness should be used. For details refer to
service precautions.
|
|
|
note |
This inspection allows you to check that there is a
short to earth in either CAN_H
line or CAN_L line. Thus, in the following steps, check the CAN
bus line that is defective.
|
|
|
(1)Disconnect engine-ECU connector and ETACS-ECU connector,
and measure the resistance
at harness side of diagnosis connector.
|
|
(2)
caution |
When measuring the resistance, disconnect the
negative battery
terminal. For details refer to service precautions.
|
Ensure that the negative battery terminal is disconnected.
|
|
(3)Resistance between diagnosis connector terminal No. 6
(CAN_H) and body
earth. OK: 1 kΩ or more
|
|
(4)Resistance between diagnosis connector terminal No. 14
(CAN_L) and body
earth. OK: 1 kΩ or more
|
|
Q.
Is the check result normal?
|
|
<Both of the measurement
results show 1 kΩ or more> Go
to Step 24.
|
|
|
|
<Either of CAN_H line
or CAN_L line the measurement
results show less than 1 kΩ> Go to Step 2.
|
|
|
|
STEP 2. Check the CAN line. Resistance measurement at C-213
intermediate
connector.
|
|
caution |
- A digital multimeter should
be used. For details refer to service precautions.
- The test wiring harness should be used. For details refer to
service precautions.
|
|
|
(1)Disconnect the C-213 intermediate connector, and measure
at its female-side intermediate
connector (at the front wiring harness side).
|
|
(2)
caution |
When measuring the resistance, disconnect the
negative battery
terminal. For details refer to service precautions.
|
Ensure that the negative battery terminal is disconnected.
|
|
(3)Resistance between C-213 intermediate connector terminal
No. 1 (CAN_H)
and body earth. OK: 1 kΩ or more
|
|
(4)Resistance between C-213 intermediate connector terminal
No. 2 (CAN_L)
and body earth. OK: 1 kΩ or more
|
|
Q.
Is the check result normal?
|
|
<1 kΩ or more>
Go to Step 13.
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|
|
|
<Less than 1 kΩ
> Go to Step 3.
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|
|
|
STEP 3. Check the CAN line between joint connector (CAN2) and the
engine-ECU. Resistance measurement at joint connector
(CAN2).
|
|
caution |
- A digital multimeter should
be used. For details refer to service precautions.
- The test wiring harness should be used. For details refer to
service precautions.
- Strictly observe the specified wiring harness repair procedure. For
details refer
to service precautions.
|
|
|
(1)Disconnect joint connector (CAN2), and measure at the
wiring harness side.
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|
(2)
caution |
When measuring the resistance, disconnect the
negative battery
terminal. For details refer to service precautions.
|
Ensure that the negative battery terminal is disconnected.
|
|
(3)Resistance between joint connector (CAN2) terminal No. 11
(CAN_H) and
body earth. OK: 1 kΩ or more
|
|
(4)Resistance between joint connector (CAN2) terminal No. 22
(CAN_L) and
body earth. OK: 1 kΩ or more
|
|
Q.
Is the check result normal?
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|
YES : <1 kΩ or
more> Go to Step 4.
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|
|
|
NO : <Less than 1 kΩ > Repair
the wiring harness between joint
connector (CAN2) and the engine-ECU connector.
|
|
|
|
STEP 4. Check the CAN line between joint connector (CAN2) and the
CVT-ECU. Resistance measurement at joint connector (CAN2).
|
|
caution |
- A digital multimeter should
be used. For details refer to service precautions.
- The test wiring harness should be used. For details refer to
service precautions.
|
|
|
(1)Disconnect joint connector (CAN2), and measure at the
wiring harness side.
|
|
(2)
caution |
When measuring the resistance, disconnect the
negative battery
terminal. For details refer to service precautions.
|
Ensure that the negative battery terminal is disconnected.
|
|
(3)Resistance between joint connector (CAN2) terminal No. 7
(CAN_H) and body
earth. OK: 1 kΩ or more
|
|
(4)Resistance between joint connector (CAN2) terminal No. 18
(CAN_L) and
body earth. OK: 1 kΩ or more
|
|
Q.
Is the check result normal?
|
|
<1 kΩ or more>
Go to Step 7.
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|
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|
<Less than 1 kΩ
> Go to Step 5.
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|
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STEP 5. M.U.T.-III CAN bus diagnostics [CVT-ECU connector
disconnected].
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|
caution |
Strictly observe the specified wiring harness
repair procedure.
For details refer to service precautions.
|
|
|
(1)Disconnect CVT-ECU connector, and diagnose by using the
M.U.T.-III.
|
![](../../../img/54/ACD04273AD00ENG.png)
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(2)Diagnose CAN bus lines, and check if
M.U.T.-III screen is as shown in the illustration.
Q.
Does M.U.T.-III screen correspond to the illustration?
Check intermediate connector, and
repair if necessary. If the intermediate connector
is in good condition, repair the wiring harness between joint connector
(CAN2) and the CVT-ECU
connector.
Check the CVT-ECU connector, and
repair if necessary. If the CVT-ECU connector
is in good condition, go to Step 6.
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|
STEP 6. M.U.T.-III CAN bus diagnostics (retest the
system).
|
|
Diagnose CAN bus lines, and check if M.U.T.-III
screen shows normal state.
|
|
Q.
Is the check result normal?
|
|
The
trouble can be an intermittent malfunction (Refer to GROUP 00 - How to use
Troubleshooting/Inspection Service Points - How to Cope with Intermittent
Malfunction).
|
|
|
|
Check
the CVT-ECU connector, and repair if necessary. If the CVT-ECU connector
is in good condition, replace the CVT-ECU.
|
|
|
|
STEP 7. Check the CAN line between joint connector (CAN2) and the
ASC-ECU. Resistance measurement at joint connector (CAN2).
|
|
caution |
- A digital multimeter should
be used. For details refer to service precautions.
- The test wiring harness should be used. For details refer to
service precautions.
|
|
|
(1)Disconnect joint connector (CAN2), and measure at the
wiring harness side.
|
|
(2)
caution |
When measuring the resistance, disconnect the
negative battery
terminal. For details refer to service precautions.
|
Ensure that the negative battery terminal is disconnected.
|
|
(3)Resistance between joint connector (CAN2) terminal No. 9
(CAN_H) and body
earth. OK: 1 kΩ or more
|
|
(4)Resistance between joint connector (CAN2) terminal No. 20
(CAN_L) and
body earth. OK: 1 kΩ or more
|
|
Q.
Is the check result normal?
|
|
<1 kΩ or more>
Go to Step 10.
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|
|
|
<Less than 1 kΩ
> Go to Step 8.
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|
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|
STEP 8. M.U.T.-III CAN bus diagnostics [ASC-ECU connector
disconnected].
|
|
caution |
Strictly observe the specified wiring harness
repair procedure.
For details refer to service precautions.
|
|
|
(1)Disconnect ASC-ECU connector, and diagnose by using the
M.U.T.-III.
|
![](../../../img/54/ACD04273AD00ENG.png)
|
(2)Diagnose CAN bus lines, and check if
M.U.T.-III screen is as shown in the illustration.
Q.
Does M.U.T.-III screen correspond to the illustration?
Repair the wiring harness between
joint connector (CAN2) and the ASC-ECU connector.
Check the ASC-ECU connector, and
repair if necessary. If the ASC-ECU connector
is in good condition, go to Step 9.
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|
STEP 9. M.U.T.-III CAN bus diagnostics (retest the
system).
|
|
Diagnose CAN bus lines, and check if M.U.T.-III
screen shows normal state.
|
|
Q.
Is the check result normal?
|
|
The
trouble can be an intermittent malfunction (Refer to GROUP 00 - How to use
Troubleshooting/Inspection Service Points - How to Cope with Intermittent
Malfunction).
|
|
|
|
Check
the ASC-ECU, and repair if necessary. If the ASC-ECU connector is in good
condition, replace the ASC-ECU. (Refer to GROUP 35C - Hydraulic Unit
).
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|
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STEP 10. Check the CAN line between joint connector (CAN2) and the
EPS-ECU. Resistance measurement at joint connector (CAN2).
|
|
caution |
- A digital multimeter should
be used. For details refer to service precautions.
- The test wiring harness should be used. For details refer to
service precautions.
- Strictly observe the specified wiring harness repair procedure. For
details refer
to service precautions.
|
|
|
(1)Disconnect joint connector (CAN2), and measure at the
wiring harness side.
|
|
(2)
caution |
When measuring the resistance, disconnect the
negative battery
terminal. For details refer to service precautions.
|
Ensure that the negative battery terminal is disconnected.
|
|
(3)Resistance between joint connector (CAN2) terminal No. 8
(CAN_H) and body
earth. OK: 1 kΩ or more
|
|
(4)Resistance between joint connector (CAN2) terminal No. 19
(CAN_L) and
body earth. OK: 1 kΩ or more
|
|
Q.
Is the check result normal?
|
|
<1 kΩ or more>
Repair C-213 intermediate connector, or
the wiring harness between joint connector (CAN2) and C-213 intermediate
connector.
|
|
|
|
<Less than 1 kΩ
> Go to Step 11.
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|
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|
STEP 11. M.U.T.-III CAN bus diagnostics [EPS-ECU connector
disconnected].
|
|
caution |
Strictly observe the specified wiring harness
repair procedure.
For details refer to service precautions.
|
|
|
(1)Disconnect EPS-ECU connector, and diagnose by using the
M.U.T.-III.
|
![](../../../img/54/ACD04273AD00ENG.png)
|
(2)Diagnose CAN bus lines, and check if
M.U.T.-III screen is as shown in the illustration.
Q.
Does M.U.T.-III screen correspond to the illustration?
Repair the wiring harness between
joint connector (CAN2) and the EPS-ECU connector.
Check the EPS-ECU connector, and
repair if necessary. If the EPS-ECU connector
is in good condition, go to Step 12.
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|
STEP 12. M.U.T.-III CAN bus diagnostics (retest the
system).
|
|
Diagnose CAN bus lines, and check if M.U.T.-III
screen shows normal state.
|
|
Q.
Is the check result normal?
|
|
The
trouble can be an intermittent malfunction (Refer to GROUP 00 - How to use
Troubleshooting/Inspection Service Points - How to Cope with Intermittent
Malfunction).
|
|
|
|
Check
the EPS-ECU connector, and repair if necessary. If the EPS-ECU connector
is in good condition, replace the EPS-ECU.
|
|
|
|
STEP 13. Check CAN line between joint connector (CAN1) and the
ETACS-ECU.
Resistance measurement at joint connector (CAN1).
|
|
caution |
- A digital multimeter should
be used. For details refer to service precautions.
- The test wiring harness should be used. For details refer to
service precautions.
- Strictly observe the specified wiring harness repair procedure. For
details refer
to service precautions.
|
|
|
(1)Disconnect joint connector (CAN1), and measure at the
wiring harness side.
|
|
(2)
caution |
When measuring the resistance, disconnect the
negative battery
terminal. For details refer to service precautions.
|
Ensure that the negative battery terminal is disconnected.
|
|
(3)Resistance between joint connector (CAN1) terminal No. 10
(CAN_H) and
body earth. OK: 1 kΩ or more
|
|
(4)Resistance between joint connector (CAN1) terminal No. 21
(CAN_L) and
body earth. OK: 1 kΩ or more
|
|
Q.
Is the check result normal?
|
|
YES : <1 kΩ or
more> Go to Step 14.
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|
|
|
NO : <Less than 1 kΩ > Repair
the wiring harness between joint
connector (CAN1) and the ETACS-ECU connector.
|
|
|
|
STEP 14. Check the CAN line between joint connector (CAN1) and the
combination meter. Resistance measurement at joint connector
(CAN1).
|
|
caution |
- A digital multimeter should
be used. For details refer to service precautions.
- The test wiring harness should be used. For details refer to
service precautions.
|
|
|
(1)Disconnect joint connector (CAN1), and measure at the
wiring harness side.
|
|
(2)
caution |
When measuring the resistance, disconnect the
negative battery
terminal. For details refer to service precautions.
|
Ensure that the negative battery terminal is disconnected.
|
|
(3)Resistance between joint connector (CAN1) terminal No. 6
(CAN_H) and body
earth. OK: 1 kΩ or more
|
|
(4)Resistance between joint connector (CAN1) terminal No. 17
(CAN_L) and
body earth. OK: 1 kΩ or more
|
|
Q.
Is the check result normal?
|
|
YES : <1 kΩ or
more> Go to Step 17.
|
|
|
|
<Less than 1 kΩ
> Go to Step 15.
|
|
|
|
STEP 15. M.U.T.-III CAN bus diagnostics [combination meter
connector disconnected].
|
|
caution |
Strictly observe the specified wiring harness
repair procedure.
For details refer to service precautions.
|
|
|
(1)Disconnect combination meter connector, and diagnose by
using the M.U.T.-III.
|
![](../../../img/54/ACD04273AD00ENG.png)
|
(2)Diagnose CAN bus lines, and check if
M.U.T.-III screen is as shown in the illustration.
Q.
Does M.U.T.-III screen correspond to the illustration?
Repair the wiring harness between
joint connector (CAN1) and the combination meter
connector.
Check the combination meter
connector, and repair if necessary. If the combination
meter connector is in good condition, go to Step 16.
|
|
STEP 16. M.U.T.-III CAN bus diagnostics (retest the
system).
|
|
Diagnose CAN bus lines, and check if M.U.T.-III
screen shows normal state.
|
|
Q.
Is the check result normal?
|
|
The
trouble can be an intermittent malfunction (Refer to GROUP 00 - How to use
Troubleshooting/Inspection Service Points - How to Cope with Intermittent
Malfunction).
|
|
|
|
Check
the combination meter connector, and repair if necessary. If the
combination
meter connector is in good condition, replace the combination
meter.
|
|
|
|
STEP 17. Check the CAN line between joint connector (CAN1) and the
SRS-ECU. Resistance measurement at joint connector (CAN1).
|
|
caution |
- A digital multimeter should
be used. For details refer to service precautions.
- The test wiring harness should be used. For details refer to
service precautions.
|
|
|
(1)Disconnect joint connector (CAN1), and measure at the
wiring harness side.
|
|
(2)
caution |
When measuring the resistance, disconnect the
negative battery
terminal. For details refer to service precautions.
|
Ensure that the negative battery terminal is disconnected.
|
|
(3)Resistance between joint connector (CAN1) terminal No. 4
(CAN_H) and body
earth. OK: 1 kΩ or more
|
|
(4)Resistance between joint connector (CAN1) terminal No. 15
(CAN_L) and
body earth. OK: 1 kΩ or more
|
|
Q.
Is the check result normal?
|
|
<1 kΩ or more>
Go to Step 20.
|
|
|
|
<Less than 1 kΩ
> Go to Step 18.
|
|
|
|
STEP 18. M.U.T.-III CAN bus diagnostics [SRS-ECU connector
disconnected].
|
|
caution |
Strictly observe the specified wiring harness
repair procedure.
For details refer to service precautions.
|
|
|
(1)Disconnect combination meter connector, and diagnose by
using the M.U.T.-III.
|
![](../../../img/54/ACD04273AD00ENG.png)
|
(2)Diagnose CAN bus lines, and check if
M.U.T.-III screen is as shown in the illustration.
Q.
Does M.U.T.-III screen correspond to the illustration?
Repair the wiring harness between
joint connector (CAN1) and the SRS-ECU connector.
Check the SRS-ECU connector, and
repair if necessary. If the SRS-ECU connector
is in good condition, go to Step 19.
|
|
STEP 19. M.U.T.-III CAN bus diagnostics (retest the
system).
|
|
Diagnose CAN bus lines, and check if M.U.T.-III
screen shows normal state.
|
|
Q.
Is the check result normal?
|
|
The
trouble can be an intermittent malfunction (Refer to GROUP 00 - How to use
Troubleshooting/Inspection Service Points - How to Cope with Intermittent
Malfunction).
|
|
|
|
Check
the SRS-ECU connector, and repair if necessary. If the SRS-ECU connector
is in good condition, replace the SRS-ECU.
|
|
|
|
STEP 20. Check the CAN line between joint connector (CAN1) and the
steering wheel sensor. Resistance measurement at joint connector
(CAN1).
|
|
caution |
- A digital multimeter should
be used. For details refer to service precautions.
- The test wiring harness should be used. For details refer to
service precautions.
|
|
|
(1)Disconnect joint connector (CAN1), and measure at the
wiring harness side.
|
|
(2)
caution |
When measuring the resistance, disconnect the
negative battery
terminal. For details refer to service precautions.
|
Ensure that the negative battery terminal is disconnected.
|
|
(3)Resistance between joint connector (CAN1) terminal No. 3
(CAN_H) and body
earth. OK: 1 kΩ or more
|
|
(4)Resistance between joint connector (CAN1) terminal No. 14
(CAN_L) and
body earth. OK: 1 kΩ or more
|
|
Q.
Is the check result normal?
|
|
<1 kΩ or more>
Go to Step 23.
|
|
|
|
<Less than 1 kΩ
> Go to Step 21.
|
|
|
|
STEP 21. M.U.T.-III CAN bus diagnostics [steering wheel sensor
connector disconnected].
|
|
caution |
Strictly observe the specified wiring harness
repair procedure.
For details refer to service precautions.
|
|
|
(1)Disconnect steering wheel sensor connector, and diagnose
by using the M.U.T.-III.
|
![](../../../img/54/ACD04273AD00ENG.png)
|
(2)Diagnose CAN bus lines, and check if
M.U.T.-III screen is as shown in the illustration.
Q.
Does M.U.T.-III screen correspond to the illustration?
Repair the wiring harness between
joint connector (CAN1) and the steering wheel
sensor connector.
Check the steering wheel sensor
connector, and repair if necessary. If the steering
wheel sensor connector is in good condition, go to Step 22.
|
|
STEP 22. M.U.T.-III CAN bus diagnostics (retest the
system).
|
|
Diagnose CAN bus lines, and check if M.U.T.-III
screen shows normal state.
|
|
Q.
Is the check result normal?
|
|
The
trouble can be an intermittent malfunction (Refer to GROUP 00 - How to use
Troubleshooting/Inspection Service Points - How to Cope with Intermittent
Malfunction).
|
|
|
|
Check
the steering wheel sensor connector, and repair if necessary. If the
steering
wheel sensor connector is in good condition, replace the steering wheel
sensor. (Refer to GROUP
35C - Steering Wheel Sensor ).
|
|
|
|
STEP 23. Check the CAN line between joint connector (CAN1) and the
diagnosis connector. Resistance measurement at joint connector
(CAN1).
|
|
caution |
- A digital multimeter should
be used. For details refer to service precautions.
- The test wiring harness should be used. For details refer to
service precautions.
- Strictly observe the specified wiring harness repair procedure. For
details refer
to service precautions.
|
|
|
(1)Disconnect joint connector (CAN1), and measure at the
wiring harness side.
|
|
(2)
caution |
When measuring the resistance, disconnect the
negative battery
terminal. For details refer to service precautions.
|
Ensure that the negative battery terminal is disconnected.
|
|
(3)Resistance between joint connector (CAN1) terminal No. 8
(CAN_H) and body
earth. OK: 1 kΩ or more
|
|
(4)Resistance between joint connector (CAN1) terminal No. 19
(CAN_L) and
body earth. OK: 1 kΩ or more
|
|
Q.
Is the check result normal?
|
|
<1 kΩ or more>
Repair the C-213 intermediate connector,
or the wiring harness between joint connector (CAN1) and the C-213
intermediate connector.
|
|
|
|
<Less than 1 kΩ >
Repair the diagnosis connector, or the
wiring harness between joint connector (CAN1) and the diagnosis
connector.
|
|
|
|
STEP 24. M.U.T.-III CAN bus diagnostics [engine-ECU connector
disconnected].
|
|
(1)Disconnect engine-ECU connector and diagnose by using the
M.U.T.-III.
|
![](../../../img/54/ACD04273AD00ENG.png)
|
(2)Diagnose CAN bus lines, and check if
M.U.T.-III screen is as shown in the illustration.
Q.
Does M.U.T.-III screen correspond to the illustration?
Go to Step
26.
Check
the engine-ECU connector, and repair if necessary. If the engine-ECU
connector
is in good condition, go to Step 25.
|
|
STEP 25. M.U.T.-III CAN bus diagnostics (retest the
system).
|
|
Diagnose CAN bus lines, and check if M.U.T.-III
screen shows normal state.
|
|
Q.
Is the check result normal?
|
|
The
trouble can be an intermittent malfunction (Refer to GROUP 00 - How to use
Troubleshooting/Inspection Service Points - How to Cope with Intermittent
Malfunction).
|
|
|
|
Check
the engine-ECU connector, and repair if necessary. If the engine-ECU
connector
is in good condition, replace the engine-ECU.
|
|
|
|
STEP 26. M.U.T.-III CAN bus diagnostics [ETACS-ECU connector
disconnected].
|
|
(1)Disconnect ETACS-ECU connector, and diagnose by using the
M.U.T.-III.
|
![](../../../img/54/ACD04273AD00ENG.png)
|
(2)Diagnose CAN bus lines, and check if
M.U.T.-III screen is as shown in the illustration.
Q.
Does M.U.T.-III screen correspond to the illustration?
The trouble can be an intermittent
malfunction (Refer to GROUP 00 - How to use
Troubleshooting/Inspection Service Points - How to Cope with Intermittent
Malfunction).
Check the ETACS-ECU connector,
and repair if necessary. If the ETACS-ECU connector
is in good condition, go to Step 27.
|
|
STEP 27. M.U.T.-III CAN bus diagnostics (retest the
system).
|
|
Diagnose CAN bus lines, and check if M.U.T.-III
screen shows normal state.
|
|
Q.
Is the check result normal?
|
|
The
trouble can be an intermittent malfunction (Refer to GROUP 00 - How to use
Troubleshooting/Inspection Service Points - How to Cope with Intermittent
Malfunction).
|
|
|
|
Check
the ETACS-ECU connector, and repair if necessary. If the ETACS-ECU
connector
is in good condition, replace the ETACS-ECU.
|
|
|