Diagnosis Item
2: Diagnose shorts in the power supply to CAN bus line
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 more than 4.0
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 KOS&OSS-ECU <Vehicles with
KOS>
- Malfunction of the auto A/C controller assembly (A/C-ECU)
<Vehicles
with automatic A/C>
- Malfunction of the EPS-ECU
- Malfunction of the ASC-ECU
- Malfunction of the steering wheel sensor
- Malfunction of the FCM-ECU <Vehicles with FCM-LS>
- Malfunction of the CVT-ECU
- Malfunction of the engine-ECU
|
STEP 1. Check the CAN bus lines. Voltage measurement at diagnosis
connector.
|
|
caution |
- A digital multimeter should
be used.
- The test wiring harness should be used.
|
|
|
note |
This inspection allows you to check that there is a
short to power supply 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 voltage
at the harness side of diagnosis connector.
|
|
(2)Connect the negative battery terminal, and turn the
ignition switch to the ON position.
|
|
(3)Voltage between diagnosis connector terminal No.6
(CAN_H) and body earth. OK: 4.0 V or less
|
|
(4)Voltage between diagnosis connector terminal No.14
(CAN_L) and body earth. OK: 4.0 V or less
|
|
(5)Disconnect the negative battery terminal.
|
|
Q.
Is the check result normal?
|
|
<Both of the measurement
results show 4.0 V or less> Go to Step
33 .
|
|
|
|
<Either of CAN_H line
or CAN_L line the measurement
results show more than 4.0 V> Go to Step 2.
|
|
|
|
STEP 2. Check the CAN line. Voltage measurement at C-212 intermediate
connector.
|
|
caution |
- A digital multimeter should
be used.
- The test wiring harness should be used.
|
|
|
(1)Disconnect the intermediate connector, and measure at its
female-side intermediate
connector (at the front wiring harness side).
|
|
(2)Connect the negative battery terminal, and turn the
ignition switch to the ON position.
|
|
(3)Voltage between C-212 intermediate connector terminal No.6
(CAN_H) and
body earth. OK: 4.0 V or less
|
|
(4)Voltage between C-212 intermediate connector terminal No.7
(CAN_L) and
body earth. OK: 4.0 V or less
|
|
(5)Disconnect the negative battery terminal.
|
|
Q.
Is the check result normal?
|
|
<4.0 V or less> Go to
Step 13.
|
|
|
|
<More than 4.0 V> Go
to Step 3.
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|
|
|
STEP 3. Check the CAN line between joint connector (CAN2) and the
engine-ECU. Voltage measurement at joint connector (CAN2).
|
|
caution |
- A digital multimeter should
be used.
- The test wiring harness should be used.
- Strictly observe the specified wiring harness repair
procedure.
|
|
|
(1)Disconnect joint connector (CAN2), and measure at the
wiring harness side.
|
|
(2)Connect the negative battery terminal, and turn the
ignition switch to the ON position.
|
|
(3)Voltage between joint connector (CAN2) terminal No.11
(CAN_H) and body
earth. OK: 4.0 V or less
|
|
(4)Voltage between joint connector (CAN2) terminal No.22
(CAN_L) and body
earth OK: 4.0 V or less
|
|
(5)Disconnect the negative battery terminal.
|
|
Q.
Is the check result normal?
|
|
YES <M/T> : <4.0 V or less> Go
to Step 7.
|
|
|
|
YES <CVT> : <4.0 V or less> Go
to Step 4.
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|
|
|
NO : <More than 4.0 V> 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. Voltage measurement at joint connector (CAN2).
|
|
caution |
- A digital multimeter should
be used.
- The test wiring harness should be used.
|
|
|
(1)Disconnect joint connector (CAN2), and measure at the
wiring harness side.
|
|
(2)Connect the negative battery terminal, and turn the
ignition switch to the ON position.
|
|
(3)Voltage between joint connector (CAN2) terminal No.7
(CAN_H) and body
earth. OK: 4.0 V or less
|
|
(4)Voltage between joint connector (CAN2) terminal No.18
(CAN_L) and body
earth. OK: 4.0 V or less
|
|
(5)Disconnect the negative battery terminal.
|
|
Q.
Is the check result normal?
|
|
<4.0 V or less> Go to
Step 7.
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|
|
|
<More than 4.0 V> Go
to Step 5.
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|
|
|
STEP 5. M.U.T.-III CAN bus diagnostics [CVT-ECU connector
disconnected].
|
|
caution |
Strictly observe the specified wiring harness
repair procedure.
|
|
|
(1)Disconnect CVT-ECU connector, and diagnose by using the
M.U.T.-III.
|
![](../../../img/54/ACF03931AB00ENG.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?
Check the 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.
|
|
|
|
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. Voltage measurement at joint connector (CAN2).
|
|
caution |
- A digital multimeter should
be used.
- The test wiring harness should be used.
|
|
|
(1)Disconnect joint connector (CAN2), and measure at the
wiring harness side.
|
|
(2)Connect the negative battery terminal, and turn the
ignition switch to the ON position.
|
|
(3)Voltage between joint connector (CAN2) terminal No.9
(CAN_H) and body
earth. OK: 4.0 V or less
|
|
(4)Voltage between joint connector (CAN2) terminal No.20
(CAN_L) and body
earth. OK: 4.0 V or less
|
|
(5)Disconnect the negative battery terminal.
|
|
Q.
Is the check result normal?
|
|
<4.0 V or less> Go to
Step 10.
|
|
|
|
<More than 4.0 V> Go
to Step 8.
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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.
|
|
|
(1)Disconnect hydraulic unit assembly (integrated with
ASC-ECU) connector, and diagnose
by using the M.U.T.-III.
|
![](../../../img/54/ACF03931AB00ENG.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 hydraulic unit
assembly (integrated with ASC-ECU) connector.
Check the hydraulic unit assembly
(integrated with ASC-ECU) connector, and repair
if necessary. If the hydraulic unit assembly (integrated with 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.
|
|
|
|
Check
the hydraulic unit assembly (integrated with ASC-ECU) connector, and repair
if necessary. If the hydraulic unit assembly (integrated with ASC-ECU)
connector is in good
condition, replace the hydraulic unit assembly (integrated with ASC-ECU).
(Refer to GROUP 35C - Hydraulic
Unit ).
|
|
|
|
STEP 10. Check the CAN line between joint connector (CAN2) and the
EPS-ECU. Voltage measurement at joint connector (CAN2).
|
|
caution |
- A digital multimeter should
be used.
- The test wiring harness should be used.
- Strictly observe the specified wiring harness repair
procedure.
|
|
|
(1)Disconnect joint connector (CAN2), and measure at the
wiring harness side.
|
|
(2)Connect the negative battery terminal, and turn the
ignition switch to the ON position.
|
|
(3)Voltage between joint connector (CAN2) terminal No.8
(CAN_H) and body
earth. OK: 4.0 V or less
|
|
(4)Voltage between joint connector (CAN2) terminal No.19
(CAN_L) and body
earth. OK: 4.0 V or less
|
|
(5)Disconnect the negative battery terminal.
|
|
Q.
Is the check result normal?
|
|
<4.0 V or less> Repair
intermediate connector C-212, or the
wiring harness between joint connector (CAN2) and the intermediate
connector C-212.
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|
|
|
<More than 4.0 V> 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.
|
|
|
(1)Disconnect EPS-ECU connector, and diagnose by using the
M.U.T.-III.
|
![](../../../img/54/ACF03931AB00ENG.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.
|
|
|
|
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 the CAN line between joint connector (CAN1) and the
ETACS-ECU. Voltage measurement at joint connector (CAN1).
|
|
caution |
- A digital multimeter should
be used.
- The test wiring harness should be used.
- Strictly observe the specified wiring harness repair
procedure.
|
|
|
(1)Disconnect joint connector (CAN1), and measure at the
wiring harness side.
|
|
(2)Connect the negative battery terminal, and turn the
ignition switch to the ON position.
|
|
(3)Voltage between joint connector (CAN1) terminal No.10
(CAN_H) and body
earth. OK: 4.0 V or less
|
|
(4)Voltage between joint connector (CAN1) terminal No.21
(CAN_L) and body
earth. OK: 4.0 V or less
|
|
(5)Disconnect the negative battery terminal.
|
|
Q.
Is the check result normal?
|
|
YES <vehicles with KOS> : <4.0 V or
less> Go to Step 14.
|
|
|
|
YES <vehicles without KOS> : <4.0 V or
less> Go to Step 17.
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|
|
|
NO : <More than 4.0 V> 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
KOS&OSS-ECU. Voltage measurement at joint connector
(CAN1).
|
|
caution |
- A digital multimeter should
be used.
- The test wiring harness should be used.
|
|
|
(1)Disconnect joint connector (CAN1), and measure at the
wiring harness side.
|
|
(2)Connect the negative battery terminal, and turn the
ignition switch to the ON position.
|
|
(3)Voltage between joint connector (CAN1) terminal No.2
(CAN_H) and body
earth. OK: 4.0 V or less
|
|
(4)Voltage between joint connector (CAN1) terminal No.13
(CAN_L) and body
earth. OK: 4.0 V or less
|
|
(5)Disconnect the negative battery terminal.
|
|
Q.
Is the check result normal?
|
|
<4.0 V or less> Go to
Step 17.
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|
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|
NO : <More than 4.0 V>
Go to Step 15.
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|
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|
STEP 15. M.U.T.-III CAN bus diagnostics [KOS&OSS-ECU
connector
disconnected].
|
|
caution |
Strictly observe the specified wiring harness
repair procedure.
|
|
|
(1)Disconnect KOS&OSS-ECU connector, and diagnose by
using the M.U.T.-III.
|
![](../../../img/54/ACF03931AB00ENG.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 KOS&OSS-ECU
connector.
Check the KOS&OSS-ECU
connector, and repair if necessary. If the KOS&OSS-ECU
connector is in good condition, go to Step 16.
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|
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.
|
|
|
|
Check
the KOS&OSS-ECU connector, and repair if necessary. If the
KOS&OSS-ECU
connector is in good condition, replace the KOS&OSS-ECU.
|
|
|
|
STEP 17. Check the CAN line between joint connector (CAN1) and the
combination meter. Voltage measurement at joint connector
(CAN1).
|
|
caution |
- A digital multimeter should
be used.
- The test wiring harness should be used.
|
|
|
(1)Disconnect joint connector (CAN1), and measure at the
wiring harness side.
|
|
(2)Connect the negative battery terminal, and turn the
ignition switch to the ON position.
|
|
(3)Voltage between joint connector (CAN1) terminal No.6
(CAN_H) and body
earth. OK: 4.0 V or less
|
|
(4)Voltage between joint connector (CAN1) terminal No.17
(CAN_L) and body
earth. OK: 4.0 V or less
|
|
(5)Disconnect the negative battery terminal.
|
|
Q.
Is the check result normal?
|
|
YES <vehicles with automatic A/C> : <4.0 V or
less> Go to Step 20.
|
|
|
|
YES <vehicles without automatic
A/C> :
<4.0 V or less> Go to Step 23.
|
|
|
|
<More than 4.0 V> Go
to Step 18.
|
|
|
|
STEP 18. M.U.T.-III CAN bus diagnostics [combination meter
connector disconnected].
|
|
caution |
Strictly observe the specified wiring harness
repair procedure.
|
|
|
(1)Disconnect combination meter connector, and diagnose by
using the M.U.T.-III.
|
![](../../../img/54/ACF03931AB00ENG.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 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.
|
|
|
|
Check
the combination meter connector, and repair if necessary. If the
combination
meter connector is in good condition, replace the combination
meter.
|
|
|
|
STEP 20. Check the CAN line between joint connector (CAN1) and the
A/C-ECU. Voltage measurement at joint connector
(CAN1).
|
|
caution |
- A digital multimeter should
be used.
- The test wiring harness should be used.
|
|
|
(1)Disconnect joint connector (CAN1), and measure at the
wiring harness side.
|
|
(2)Connect the negative battery terminal, and turn the
ignition switch to the ON position.
|
|
(3)Voltage between joint connector (CAN1) terminal No.1
(CAN_H) and body
earth. OK: 4.0 V or less
|
|
(4)Voltage between joint connector (CAN1) terminal No.12
(CAN_L) and body
earth. OK: 4.0 V or less
|
|
(5)Disconnect the negative battery terminal.
|
|
Q.
Is the check result normal?
|
|
<4.0 V or less> Go to
Step 23.
|
|
|
|
<More than 4.0 V> Go
to Step 21.
|
|
|
|
STEP 21. M.U.T.-III CAN bus diagnostics [A/C-ECU connector
disconnected].
|
|
caution |
Strictly observe the specified wiring harness
repair procedure.
|
|
|
(1)Disconnect auto A/C controller assembly (A/C-ECU)
connector, and diagnose
by using the M.U.T.-III.
|
![](../../../img/54/ACF03931AB00ENG.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 auto A/C controller
assembly (A/C-ECU) connector.
Check the auto A/C controller
assembly (A/C-ECU) connector, and repair
if necessary. If the auto A/C controller assembly (A/C-ECU) 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.
|
|
|
|
Check
the auto A/C controller assembly (A/C-ECU), and repair if necessary.
If the auto A/C controller assembly (A/C-ECU) is in good condition,
replace the auto
A/C controller assembly (A/C-ECU).
|
|
|
|
STEP 23. Check the CAN line between joint connector (CAN1) and the
SRS-ECU. Voltage measurement at joint connector (CAN1).
|
|
caution |
- A digital multimeter should
be used.
- The test wiring harness should be used.
|
|
|
(1)Disconnect joint connector (CAN1), and measure at the
wiring harness side.
|
|
(2)Connect the negative battery terminal, and turn the
ignition switch to the ON position.
|
|
(3)Voltage between joint connector (CAN1) terminal No.4
(CAN_H) and body
earth. OK: 4.0 V or less
|
|
(4)Voltage between joint connector (CAN1) terminal No.15
(CAN_L) and body
earth. OK: 4.0 V or less
|
|
(5)Disconnect the negative battery terminal.
|
|
Q.
Is the check result normal?
|
|
<4.0 V or less> Go to
Step 26.
|
|
|
|
<More than 4.0 V> Go
to Step 24.
|
|
|
|
STEP 24. M.U.T.-III CAN bus diagnostics [SRS-ECU connector
disconnected].
|
|
caution |
Strictly observe the specified wiring harness
repair procedure.
|
|
|
(1)Disconnect SRS-ECU connector, and diagnose by using the
M.U.T.-III.
|
![](../../../img/54/ACF03931AB00ENG.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 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.
|
|
|
|
Check
the SRS-ECU connector, and repair if necessary. If the SRS-ECU connector
is in good condition, replace the SRS-ECU.
|
|
|
|
STEP 26. Check the CAN line between joint connector (CAN1) and the
steering wheel sensor. Voltage measurement at joint connector
(CAN1).
|
|
caution |
- A digital multimeter should
be used.
- The test wiring harness should be used.
|
|
|
(1)Disconnect joint connector (CAN1), and measure at the
wiring harness side.
|
|
(2)Connect the negative battery terminal, and turn the
ignition switch to the ON position.
|
|
(3)Voltage between joint connector (CAN1) terminal No.7
(CAN_H) and body
earth. OK: 4.0 V or less
|
|
(4)Voltage between joint connector (CAN1) terminal No.18
(CAN_L) and body
earth. OK: 4.0 V or less
|
|
(5)Disconnect the negative battery terminal.
|
|
Q.
Is the check result normal?
|
|
YES <vehicles with FCM-LS> : <4.0 V or
less> Go to Step 29.
|
|
|
|
YES <vehicles without FCM-LS> : <4.0 V or
less> Go to Step 32.
|
|
|
|
<More than 4.0 V> Go
to Step 27.
|
|
|
|
STEP 27. M.U.T.-III CAN bus diagnostics [steering wheel sensor
connector disconnected].
|
|
caution |
Strictly observe the specified wiring harness
repair procedure.
|
|
|
(1)Disconnect steering wheel sensor connector, and diagnose
by using the M.U.T.-III.
|
![](../../../img/54/ACF03931AB00ENG.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 28.
|
|
STEP 28. 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.
|
|
|
|
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 29. Check the CAN line between joint connector (CAN1) and the
FCM-ECU. Voltage measurement at joint connector (CAN1).
|
|
caution |
- A digital multimeter should
be used.
- The test wiring harness should be used.
|
|
|
(1)Disconnect joint connector (CAN1), and measure at the
wiring harness side.
|
|
(2)Connect the negative battery terminal, and turn the
ignition switch to the ON position.
|
|
(3)Voltage between joint connector (CAN1) terminal No.5
(CAN_H) and body
earth. OK: 4.0 V or less
|
|
(4)Voltage between joint connector (CAN1) terminal No.16
(CAN_L) and body
earth. OK: 4.0 V or less
|
|
(5)Disconnect the negative battery terminal.
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|
Q.
Is the check result normal?
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|
<4.0 V or less> Go to
Step 32.
|
|
|
|
<More than 4.0 V> Go
to Step 30.
|
|
|
|
STEP 30. M.U.T.-III CAN bus diagnostics [FCM-ECU connector
disconnected].
|
|
caution |
Strictly observe the specified wiring harness
repair procedure.
|
|
|
(1)Disconnect FCM-ECU connector, and diagnose by using the
M.U.T.-III.
|
![](../../../img/54/ACF03931AB00ENG.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?
Repair the wiring harness between
joint connector (CAN1) and the FCM-ECU connector.
Check the FCM-ECU connector, and
repair if necessary. If the FCM-ECU connector
is in good condition, go to Step 31.
|
|
STEP 31. 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.
|
|
|
|
Check
the FCM-ECU connector, and repair if necessary. If the FCM-ECU connector
is in good condition, replace the laser radar (FCM-ECU). (Refer to GROUP
54A - FCM-LS,
Laser Radar ).
|
|
|
|
STEP 32. Check the CAN line between joint connector (CAN1) and the
diagnosis connector. Voltage measurement at joint connector
(CAN1).
|
|
caution |
- A digital multimeter should
be used.
- The test wiring harness should be used.
- Strictly observe the specified wiring harness repair
procedure.
|
|
|
(1)Disconnect joint connector (CAN1), and measure at the
wiring harness side.
|
|
(2)Connect the negative battery terminal, and turn the
ignition switch to the ON position.
|
|
(3)Voltage between joint connector (CAN1) terminal No.8
(CAN_H) and body
earth. OK: Less than 1.0 V
|
|
(4)Voltage between joint connector (CAN1) terminal No.19
(CAN_L) and body
earth. OK: Less than 1.0 V
|
|
(5)Disconnect the negative battery terminal.
|
|
Q.
Is the check result normal?
|
|
<Less than 1.0 V> Repair
the intermediate connector, or the
wiring harness between joint connector (CAN1) and the intermediate
connector C-212.
|
|
|
|
<1.0 V or more> Repair the
diagnosis connector, or the wiring
harness between joint connector (CAN1) and the diagnosis
connector.
|
|
|
|
STEP 33. 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/ACF03931AB00ENG.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
35.
Check
the engine-ECU connector, and repair if necessary. If the engine-ECU
connector
is in good condition, go to Step 34.
|
|
STEP 34. 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.
|
|
|
|
Check
the engine-ECU connector, and repair if necessary. If the engine-ECU
connector
is in good condition, replace the engine-ECU.
|
|
|
|
STEP 35. 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/ACF03931AB00ENG.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.
Check the ETACS-ECU connector,
and repair if necessary. If the ETACS-ECU connector
is in good condition, go to Step 36.
|
|
STEP 36. 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.
|
|
|
|
Check
the ETACS-ECU connector, and repair if necessary. If the ETACS-ECU
connector
is in good condition, replace the ETACS-ECU.
|
|
|