Diagnosis Item
2: Diagnose shorts in the power supply to CAN bus line.
<LHD>
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 transfer-ECU <4WD (6M/T, A/T)>
- Malfunction of the A/C-ECU <Vehicles with automatic
A/C>
- Malfunction of the KOS&OSS-ECU <Vehicles with
KOS&OSS>
- Malfunction of the SRS-ECU
- Malfunction of the ABS-ECU <Vehicles with ABS>
- Malfunction of the ASTC-ECU <Vehicles with ASTC>
- Malfunction of the steering wheel sensor <Vehicles with
ASTC>
- Malfunction of the A/T-ECU <A/T>
- Malfunction of the engine-ECU
|
STEP 1. Check the CAN bus lines. Voltage 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 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
30.
|
|
|
|
<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 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)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?
|
|
<4.0 V or less> Go to
Step 13.
|
|
|
|
<More than 4.0 V> Go
to Step 3.
|
|
|
|
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. 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)Connect the negative battery terminal, and turn the
ignition switch to the "ON"
position.
|
|
(3)Voltage between joint connector (CAN2) terminal No.10
(CAN_H) and body
earth OK: 4.0 V or less
|
|
(4)Voltage between joint connector (CAN2) 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 ABS or ASTC> : <4.0 V or
less> Go to Step 4.
|
|
|
|
YES <Vehicles without ABS and ASTC, and
with KOS&OSS> : <4.0 V or less> Go
to Step 7.
|
|
|
|
YES <Vehicles without ABS, ASTC and
KOS&OSS> : <4.0 V or less> Go
to Step 10.
|
|
|
|
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
ABS-ECU or ASTC-ECU. Voltage 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)Connect the negative battery terminal, and turn the
ignition switch to the "ON"
position.
|
|
(3)Voltage between joint connector (CAN2) terminal No.5
(CAN_H) and body
earth OK: 4.0 V or less
|
|
(4)Voltage between joint connector (CAN2) terminal No.16
(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.
|
|
|
|
<More than 4.0 V> Go
to Step 5.
|
|
|
|
STEP 5. M.U.T.-III CAN bus diagnostics [ABS-ECU or ASTC-ECU
connector disconnected]
|
|
(1)Disconnect ABS-ECU or ASTC-ECU connector, and diagnose by
using the M.U.T.-III.
|
![](../../../img/54/ACG02475AB00ENG.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 ABS-ECU or ASTC-ECU connector.
Check the ABS-ECU or ASTC-ECU
connector, and repair if necessary. If the ABS-ECU
or ASTC-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 ABS-ECU or ASTC-ECU connector, and repair if necessary. If the ABS-ECU
connector is in good condition, replace the ABS-ECU (Refer to GROUP 35B
- Hydraulic
Unit) or ASTC-ECU (Refer to GROUP 35C - Hydraulic Unit).
|
|
|
|
STEP 7. Check the CAN line between joint connector (CAN2) and the
KOS&OSS-ECU. Voltage 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)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> Go to
Step 10.
|
|
|
|
<More than 4.0 V> Go
to Step 8.
|
|
|
|
STEP 8. 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/ACG02475AB00ENG.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 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 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 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 10. Check the CAN line between joint connector (CAN2) and the
SRS-ECU. Voltage 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)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> Repair the
wiring harness between joint connector
(CAN2) and the joint connector (CAN1).
|
|
|
|
<More than 4.0 V> Go
to Step 11.
|
|
|
|
STEP 11. 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/ACG02475AB00ENG.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 SRS-ECU connector.
Check the SRS-ECU connector, and
repair if necessary. If the SRS-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 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 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. 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)Connect the negative battery terminal, and turn the
ignition switch to the "ON"
position.
|
|
(3)Voltage between joint connector (CAN1) terminal No.11
(CAN_H) and body
earth OK: 4.0 V or less
|
|
(4)Voltage between joint connector (CAN1) 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 <Vehicles with automatic A/C> : <4.0 V or
less> Go to Step 14.
|
|
|
|
YES <Vehicles without automatic A/C
[4WD (6M/T, A/T)]> : <4.0 V or less> Go
to Step 17.
|
|
|
|
YES <Vehicles without automatic A/C
(2WD-A/T)>
: <4.0 V or less> Go to Step 20.
|
|
|
|
YES <Vehicles without automatic A/C
(2WD-M/T, 4WD-5M/T)> : <4.0 V or less> Go
to Step 23.
|
|
|
|
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
A/C-ECU. Voltage 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)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.
|
|
Q.
Is the check result normal?
|
|
YES <4WD (6M/T, A/T)> : <4.0 V or
less> Go to Step 17.
|
|
|
|
YES <2WD-A/T> : <4.0 V or less> Go
to Step 20.
|
|
|
|
YES <2WD-M/T, 4WD-5M/T> : <4.0 V or
less> Go to Step 23.
|
|
|
|
NO : <More than 4.0 V>
Go to Step 15.
|
|
|
|
STEP 15. 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/ACG02475AB00ENG.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 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 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 -
Heater control unit).
|
|
|
|
STEP 17. Check the CAN line between joint connector (CAN1) and the
transfer-ECU. Voltage 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)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?
|
|
YES <A/T> : <4.0 V or less> Go
to Step 20.
|
|
|
|
YES <M/T> : <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 [transfer-ECU connector
disconnected]
|
|
(1)Disconnect transfer-ECU connector, and diagnose by using
the M.U.T.-III.
|
![](../../../img/54/ACG02475AB00ENG.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 transfer-ECU
connector.
Check the transfer-ECU connector,
and repair if necessary. If the transfer-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 transfer-ECU connector, and repair if necessary. If the transfer-ECU
connector is in good condition, replace the transfer-ECU (Refer to GROUP
22A - Transfer-ECU <M/T> or
GROUP 23A - Transfer-ECU <A/T>).
|
|
|
|
STEP 20. Check the CAN line between joint connector (CAN1) and the
A/T-ECU. Voltage 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)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/T-ECU connector
disconnected]
|
|
(1)Disconnect A/T-ECU connector, and diagnose by using the
M.U.T.-III.
|
![](../../../img/54/ACG02475AB00ENG.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/T-ECU connector.
Check the A/T-ECU connector, and
repair if necessary. If the A/T-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 (Refer to GROUP 00 - How
to use Troubleshooting/inspection Service Points - How to Cope
with Intermittent
Malfunction).
|
|
|
|
Check
the A/T-ECU connector, and repair if necessary. If the A/T-ECU connector
is in good condition, replace the A/T-ECU (Refer to GROUP 23A -
A/T-ECU).
|
|
|
|
STEP 23. 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. 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)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?
|
|
YES <Vehicles with ASTC> : <4.0 V or
less> Go to Step 26.
|
|
|
|
YES <Vehicles without ASTC> : <4.0 V or
less> Go to Step 29.
|
|
|
|
<More than 4.0 V> Go
to Step 24.
|
|
|
|
STEP 24. 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/ACG02475AB00ENG.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 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 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).
|
|
|
|
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. 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)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?
|
|
<4.0 V or less> Go to
Step 29.
|
|
|
|
<More than 4.0 V> Go
to Step 27.
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STEP 27. M.U.T.-III CAN bus diagnostics [steering wheel sensor
connector disconnected]
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|
(1)Disconnect steering wheel sensor connector, and diagnose
by using the M.U.T.-III.
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![](../../../img/54/ACG02475AB00ENG.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 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.
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STEP 28. M.U.T.-III CAN bus diagnostics (retest the
system)
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|
Diagnose CAN bus lines, and check if M.U.T.-III
screen shows normal state.
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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).
|
|
|
|
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).
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STEP 29. Check the CAN line between joint connector (CAN1) and the
diagnosis connector. Voltage measurement at joint connector
(CAN1).
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|
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.
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(2)Connect the negative battery terminal, and turn the
ignition switch to the "ON"
position.
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(3)Voltage between joint connector (CAN1) terminal No.10
(CAN_H) and body
earth OK: Less than 1.0 V
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|
(4)Voltage between joint connector (CAN1) terminal No.21
(CAN_L) and body
earth OK: Less than 1.0 V
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|
(5)Disconnect the negative battery terminal.
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|
Q.
Is the check result normal?
|
|
<Less than 1.0 V> The
trouble can be an intermittent malfunction
(Refer to GROUP 00 - How to use Troubleshooting/inspection
Service Points - How
to Cope with Intermittent Malfunction).
|
|
|
|
<1.0 V or more> Repair the
diagnosis connector, or the wiring
harness between joint connector (CAN1) and the diagnosis
connector.
|
|
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|
STEP 30. 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/ACG02475AB00ENG.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
32.
Check
the engine-ECU connector, and repair if necessary. If the engine-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 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 <4G6>,
GROUP 13B - Engine-ECU <4D5> or GROUP 13C -
Engine-ECU <4N1>).
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|
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STEP 32. 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/ACG02475AB00ENG.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 33.
|
|
STEP 33. 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).
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|
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