Diagnosis Item
3: Diagnose shorts in the earth 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 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 KOS&OSS-ECU
- Malfunction of the A/C-ECU
- Malfunction of the EPS-ECU
- Malfunction of the ABS-ECU <Vehicles without ASC> or ASC-ECU
<Vehicles
with ASC>
- Malfunction of the CVT-ECU
- Malfunction of the engine-ECU
- Malfunction of the Steering wheel sensor <Vehicles with
ASC>
- Malfunction of the FCM-ECU <Vehicles with FCM-LS>
|
STEP 1. Check the CAN bus lines. Resistance measurement
at diagnosis connector.
|
|
caution |
A digital multimeter should be used. For details
refer to .
|
|
|
caution |
The test wiring harness should be used. For details
refer
to .
|
|
|
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 .
|
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 33.
|
|
|
|
<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 .
|
|
|
caution |
The test wiring harness should be used. For details
refer
to .
|
|
|
(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 .
|
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.
|
|
|
|
<Less than 1 kΩ
> Go to Step 3.
|
|
|
|
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 .
|
|
|
caution |
The test wiring harness should be used. For details
refer
to .
|
|
|
(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 .
|
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?
|
|
YES <CVT> : <1 kΩ or
more> Go to Step 4.
|
|
|
|
YES <M/T (with ABS or ASC)> : <1
kΩ or more> Go to Step 7.
|
|
|
|
YES <M/T (without ABS or
ASC)> :
<1 kΩ or more> Go to Step 10.
|
|
|
|
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 .
|
|
|
caution |
The test wiring harness should be used. For details
refer
to .
|
|
|
(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 .
|
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.
|
|
|
|
<Less than 1 kΩ
> Go to Step 5.
|
|
|
|
STEP 5. M.U.T.-III CAN bus diagnostics [CVT-ECU connector
disconnected]
|
|
(1)Disconnect CVT-ECU connector, and diagnose by using the
M.U.T.-III.
|
![](../../../img/54/ACF03967AB00ENG.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 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.
|
|
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 (Refer to GROUP 23A -
CVT-ECU ).
|
|
|
|
STEP 7. Check the CAN line between joint connector (CAN2) and the
ABS-ECU or ASC-ECU. Resistance measurement at joint connector
(CAN2).
|
|
caution |
A digital multimeter should be used. For details
refer to .
|
|
|
caution |
The test wiring harness should be used. For details
refer
to .
|
|
|
(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 .
|
Ensure that the negative battery terminal is disconnected.
|
|
(3)Resistance between joint connector (CAN2) terminal No.10
(CAN_H) and body
earth <Vehicles without ASC> OK: 1 kΩ or
more
|
|
(4)Resistance between joint connector (CAN2) terminal No.21
(CAN_L) and body
earth <Vehicles without ASC> OK: 1 kΩ or
more
|
|
(5)Resistance between joint connector (CAN2) terminal No.9
(CAN_H) and body
earth <Vehicles with ASC> OK: 1 kΩ or
more
|
|
(6)Resistance between joint connector (CAN2) terminal No.20
(CAN_L) and body
earth <Vehicles with ASC> OK: 1 kΩ or
more
|
|
Q.
Is the check result normal?
|
|
<1 kΩ or more>
Go to Step 10.
|
|
|
|
<Less than 1 kΩ
> Go to Step 8.
|
|
|
|
STEP 8. M.U.T.-III CAN bus diagnostics [ABS-ECU or ASC-ECU
connector disconnected]
|
|
(1)Disconnect ABS-ECU or ASC-ECU connector, and diagnose by
using the M.U.T.-III.
|
![](../../../img/54/ACF03967AB00ENG.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 ABS-ECU or ASC-ECU
connector.
Check the ABS-ECU or ASC-ECU
connector, and repair if necessary. If the ABS-ECU
or ASC-ECU connector is in good condition, go to Step 9.
|
|
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 ABS-ECU or ASC-ECU connector, and repair if necessary. If the ABS-ECU
or ASC-ECU connector is in good condition, replace the ABS-ECU (Refer to
GROUP 35B - Hydraulic
Unit ) or ASC-ECU (Refer to GROUP 35C
- Hydraulic Unit ).
|
|
|
|
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 .
|
|
|
caution |
The test wiring harness should be used. For details
refer
to .
|
|
|
(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 .
|
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.
|
|
|
|
STEP 11. M.U.T.-III CAN bus diagnostics [EPS-ECU connector
disconnected]
|
|
(1)Disconnect EPS-ECU connector, and diagnose by using the
M.U.T.-III.
|
![](../../../img/54/ACF03967AB00ENG.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.
|
|
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 (Refer to GROUP 37 -
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 .
|
|
|
caution |
The test wiring harness should be used. For details
refer
to .
|
|
|
(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 .
|
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
|
|
(5)
caution |
Strictly observe the specified wiring harness repair
procedure.
For details refer to .
|
|
|
Q.
Is the check result normal?
|
|
YES <vehicles with KOS> : <1
kΩ or more> Go to Step 14.
|
|
|
|
YES <vehicles without KOS> : <1
kΩ or more> Go to Step 17.
|
|
|
|
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
KOS&OSS-ECU. Resistance measurement at joint connector
(CAN1).
|
|
caution |
A digital multimeter should be used. For details
refer to .
|
|
|
caution |
The test wiring harness should be used. For details
refer
to .
|
|
|
(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 .
|
Ensure that the negative battery terminal is disconnected.
|
|
(3)Resistance between joint connector (CAN1) terminal No.11
(CAN_H) and body
earth <LHD> OK: 1 kΩ or more
|
|
(4)Resistance between joint connector (CAN1) terminal No.22
(CAN_L) and body
earth <LHD> OK: 1 kΩ or more
|
|
(5)Resistance between joint connector (CAN1) terminal No.2
(CAN_H) and body
earth <RHD> OK: 1 kΩ or more
|
|
(6)Resistance between joint connector (CAN1) terminal No.13
(CAN_L) and body
earth <RHD> OK: 1 kΩ or more
|
|
(7)
caution |
Strictly observe the specified wiring harness repair
procedure.
For details refer to .
|
|
|
Q.
Is the check result normal?
|
|
<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 [KOS&OSS-ECU
connector
disconnected]
|
|
(1)Disconnect KOS&OSS-ECU connector, and diagnose by
using the M.U.T.-III.
|
![](../../../img/54/ACF03967AB00ENG.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.
|
|
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 KOS&OSS-ECU connector, and repair if necessary. If the
KOS&OSS-ECU
connector is in good condition, replace the KOS&OSS-ECU (Refer to
GROUP 42B - KOS&OSS-ECU ).
|
|
|
|
STEP 17. Check the CAN line between joint connector (CAN1) and the
A/C-ECU. Resistance measurement at joint connector
(CAN1).
|
|
caution |
A digital multimeter should be used. For details
refer to .
|
|
|
caution |
The test wiring harness should be used. For details
refer
to .
|
|
|
(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 .
|
Ensure that the negative battery terminal is disconnected.
|
|
(3)Resistance between joint connector (CAN1) terminal No.7
(CAN_H) and body
earth <LHD> OK: 1 kΩ or more
|
|
(4)Resistance between joint connector (CAN1) terminal No.18
(CAN_L) and body
earth <LHD> OK: 1 kΩ or more
|
|
(5)Resistance between joint connector (CAN1) terminal No.1
(CAN_H) and body
earth <RHD> OK: 1 kΩ or more
|
|
(6)Resistance between joint connector (CAN1) terminal No.12
(CAN_L) and body
earth <RHD> OK: 1 kΩ or more
|
|
(7)
caution |
Strictly observe the specified wiring harness repair
procedure.
For details refer to .
|
|
|
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 [A/C-ECU connector
disconnected]
|
|
(1)Disconnect A/C-ECU connector, and diagnose by using
the M.U.T.-III.
|
![](../../../img/54/ACF03967AB00ENG.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 A/C-ECU connector.
Check the A/C-ECU
connector, and repair if necessary. If the A/C-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 A/C-ECU connector, and repair if necessary. If the A/C-ECU
connector is in good condition, replace the A/C-ECU (Refer to GROUP
55B - Auto
A/C Controller Assembly ).
|
|
|
|
STEP 20. 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 .
|
|
|
caution |
The test wiring harness should be used. For details
refer
to .
|
|
|
(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 .
|
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
|
|
(5)
caution |
Strictly observe the specified wiring harness repair
procedure.
For details refer to .
|
|
|
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 [combination meter
connector disconnected]
|
|
(1)Disconnect combination meter connector, and diagnose by
using the M.U.T.-III.
|
![](../../../img/54/ACF03967AB00ENG.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 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 combination meter connector, and repair if necessary. If the
combination
meter connector is in good condition, replace the combination meter (Refer
to GROUP 54A - Combination
Meter, Combination Meter ).
|
|
|
|
STEP 23. 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 .
|
|
|
caution |
The test wiring harness should be used. For details
refer
to .
|
|
|
(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 .
|
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
|
|
(5)
caution |
Strictly observe the specified wiring harness repair
procedure.
For details refer to .
|
|
|
Q.
Is the check result normal?
|
|
<1 kΩ or more>
Go to Step 26.
|
|
|
|
<Less than 1 kΩ
> Go to Step 24.
|
|
|
|
STEP 24. M.U.T.-III CAN bus diagnostics [SRS-ECU connector
disconnected]
|
|
(1)Disconnect SRS-ECU connector, and diagnose by using the
M.U.T.-III.
|
![](../../../img/54/ACF03967AB00ENG.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 (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 (Refer to GROUP 52B -
SRS-ECU ).
|
|
|
|
STEP 26. 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 .
|
|
|
caution |
The test wiring harness should be used. For details
refer
to .
|
|
|
(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 .
|
Ensure that the negative battery terminal is disconnected.
|
|
(3)Resistance between joint connector (CAN1) terminal No.3
<LHD> or
7 <RHD> (CAN_H) and body earth OK: 1 kΩ
or more
|
|
(4)Resistance between joint connector (CAN1) terminal No.14
<LHD> or
18 <RHD> (CAN_L) and body earth OK: 1
kΩ or more
|
|
(5)
caution |
Strictly observe the specified wiring harness repair
procedure.
For details refer to .
|
|
|
Q.
Is the check result normal?
|
|
<1 kΩ or more>
Go to Step 29.
|
|
|
|
<Less than 1 kΩ
> Go to Step 27.
|
|
|
|
STEP 27. M.U.T.-III CAN bus diagnostics [Steering wheel sensor
connector disconnected]
|
|
(1)Disconnect steering wheel sensor connector, and diagnose
by using the M.U.T.-III.
|
![](../../../img/54/ACF03967AB00ENG.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 (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 29. Check the CAN line between joint connector (CAN1) and the
FCM-ECU. Resistance measurement at joint connector (CAN1).
|
|
caution |
A digital multimeter should be used. For details
refer to .
|
|
|
caution |
The test wiring harness should be used. For details
refer
to .
|
|
|
(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 .
|
Ensure that the negative battery terminal is disconnected.
|
|
(3)Resistance between joint connector (CAN1) terminal No.5
(CAN_H) and body
earth OK: 1 kΩ or more
|
|
(4)Resistance between joint connector (CAN1) terminal No.16
(CAN_L) and body
earth OK: 1 kΩ or more
|
|
(5)
caution |
Strictly observe the specified wiring harness repair
procedure.
For details refer to .
|
|
|
Q.
Is the check result normal?
|
|
<1 kΩ or more>
Go to Step 32.
|
|
|
|
<Less than 1 kΩ
> Go to Step 30.
|
|
|
|
STEP 30. M.U.T.-III CAN bus diagnostics [FCM-ECU connector
disconnected]
|
|
(1)Disconnect FCM-ECU connector, and diagnose by using the
M.U.T.-III.
|
![](../../../img/54/ACF03967AB00ENG.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 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 (Refer to GROUP 00 - How
to use Troubleshooting/inspection Service Points - How to Cope
with 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. Resistance measurement at joint connector
(CAN1).
|
|
caution |
A digital multimeter should be used. For details
refer to .
|
|
|
caution |
The test wiring harness should be used. For details
refer
to .
|
|
|
(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 .
|
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
|
|
(5)
caution |
Strictly observe the specified wiring harness repair
procedure.
For details refer to .
|
|
|
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 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/ACF03967AB00ENG.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 (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 (Refer to GROUP 13A -
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/ACF03967AB00ENG.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 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 (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 (Refer to GROUP 54A -
ETACS, ETACS-ECU ).
|
|
|