Diagnosis Item
6: Diagnose shorts in the power supply to CAN bus line (SUB). <Vehicles
with Automatic
A/C>
| caution |
When servicing a CAN bus line,
earth yourself by touching a metal object such as an unpainted water pipe.
If you fail to do,
a component connected to the CAN bus line may be broken.
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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 gateway-ECU <Vehicles with automatic
A/C>
- Malfunction of the A/C-ECU <Vehicles with automatic
A/C>
- Malfunction of the camera-ECU <Vehicles with multi around monitor
system>
- Malfunction of the headlamp automatic levelling-ECU <Vehicles with
auto
headlamp levelling system>
- Malfunction of the smartphone link display audio <Vehicles for
RUSSIA,
AUSTRALIA and NEW ZEALAND>
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STEP 1. Check the CAN bus lines. Voltage measurement at gateway-ECU
connector.
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| caution |
A digital multimeter should be used.
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| caution |
The test wiring harness should be used.
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| 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.
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(1)Disconnect A/C-ECU connector and gateway-ECU connector,
and measure the voltage
at the harness side of diagnosis connector.
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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 gateway-ECU connector terminal No.6
(CAN_H) and body earth.
OK: 4.0 V or less
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(4)Voltage between gateway-ECU connector terminal No.5
(CAN_L) and body earth.
OK: 4.0 V or less
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(5)Disconnect the negative battery terminal.
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Q.
Is the check result normal?
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 <Both of the measurement
results show 4.0 V or less> Go to Step
13.
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 <Either of CAN_H line
or CAN_L line the measurement
results show more than 4.0 V> Go to Step 2.
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STEP 2. Check the CAN line between joint connector (CAN4) and the
gateway-ECU. Voltage measurement at joint connector (CAN4).
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| caution |
A digital multimeter should be used.
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| caution |
The test wiring harness should be used.
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(1)Disconnect joint connector (CAN4), 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 (CAN4) terminal No.10
(CAN_H) and body
earth.
OK: 4.0 V or less
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(4)Voltage between joint connector (CAN4) terminal No.21
(CAN_L) and body
earth.
OK: 4.0 V or less
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(5)Disconnect the negative battery terminal.
| caution |
Strictly observe the specified wiring harness repair
procedure.
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Q.
Is the check result normal?
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YES  : <4.0 V or less> Go
to Step 3.
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NO : <More than 4.0 V> Repair the
wiring harness between joint connector
(CAN4) and the gateway-ECU connector.
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STEP 3. Check the CAN line between joint connector (CAN4) and the
headlamp automatic levelling-ECU. Voltage measurement at joint connector
(CAN4).
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| caution |
A digital multimeter should be used.
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| caution |
The test wiring harness should be used.
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(1)Disconnect joint connector (CAN4), 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 (CAN4) terminal No.1
(CAN_H) and body
earth.
OK: 4.0 V or less
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(4)Voltage between joint connector (CAN4) terminal No.12
(CAN_L) and body
earth.
OK: 4.0 V or less
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(5)Disconnect the negative battery terminal.
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Q.
Is the check result normal?
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YES : <4.0 V or less> Go
to Step 6.
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<More than 4.0 V> Go
to Step 4.
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STEP 4. M.U.T.-III CAN bus diagnostics [Headlamp automatic
levelling-ECU connector disconnected]
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(1)Disconnect headlamp automatic levelling-ECU connector, and
diagnose by using the
M.U.T.-III.
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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 (CAN4) and the headlamp automatic
levelling-ECU connector.
Check the headlamp automatic
levelling-ECU connector, and repair if necessary.
If the headlamp automatic levelling-ECU connector is in good condition, go
to Step 5.
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STEP 5. 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).
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Check
the headlamp levelling-ECU connector, and repair if necessary. If the
headlamp
levelling-ECU connector is in good condition, replace the headlamp
levelling-ECU (Refer to GROUP
54A - Headlamp Automatic levelling System, Headlamp
levelling-ECU).
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STEP 6. Check the CAN line between joint connector (CAN4) and the
smartphone link display audio. Voltage measurement at joint connector
(CAN4).
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| caution |
A digital multimeter should be used.
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| caution |
The test wiring harness should be used.
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(1)Disconnect joint connector (CAN4), 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 (CAN4) terminal No.2
(CAN_H) and body
earth.
OK: 4.0 V or less
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(4)Voltage between joint connector (CAN4) terminal No.13
(CAN_L) and body
earth.
OK: 4.0 V or less
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(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 9.
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<More than 4.0 V> Go
to Step 7.
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STEP 7. M.U.T.-III CAN bus diagnostics [Smartphone link display
audio connector disconnected]
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(1)Disconnect smartphone link display audio connector, and
diagnose by using the M.U.T.-III.
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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 (CAN4) and the smartphone link
display audio connector.
Check the smartphone link display
audio connector, and repair if necessary. If
the smartphone link display audio connector is in good condition, go to
Step 8.
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STEP 8. 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).
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Check
the camera-ECU connector, and repair if necessary. If the smartphone link
display audio connector is in good condition, replace the smartphone link
display audio (Refer
to GROUP 54A - Smartphone Link Display Audio, Troubleshooting  ).
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STEP 9. Check the CAN line between joint connector (CAN4) and the
camera-ECU. Voltage measurement at joint connector (CAN4).
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| caution |
A digital multimeter should be used.
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| caution |
The test wiring harness should be used.
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(1)Disconnect joint connector (CAN4), 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 (CAN4) terminal No.3
(CAN_H) and body
earth.
OK: 4.0 V or less
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(4)Voltage between joint connector (CAN4) terminal No.14
(CAN_L) and body
earth.
OK: 4.0 V or less
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(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 12.
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<More than 4.0 V> Go
to Step 10.
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STEP 10. M.U.T.-III CAN bus diagnostics [Camera-ECU connector
disconnected]
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(1)Disconnect camera-ECU connector, and diagnose by using the
M.U.T.-III.
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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 (CAN4) and the camera-ECU connector.
Check the
camera-ECU connector, and repair if necessary. If the camera-ECU connector
is in good condition, go to Step 11.
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STEP 11. 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).
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Check
the camera-ECU connector, and repair if necessary. If the camera-ECU
connector
is in good condition, replace the camera-ECU (Refer to GROUP 54A -
Camera System, Camera-ECU).
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STEP 12. Check the CAN line between joint connector (CAN4) and the
A/C-ECU. Voltage measurement at joint connector (CAN4).
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| caution |
A digital multimeter should be used.
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| caution |
The test wiring harness should be used.
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(1)Disconnect joint connector (CAN4), 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 (CAN4) terminal No.11
(CAN_H) and body
earth.
OK: 4.0 V or less
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(4)Voltage between joint connector (CAN4) terminal No.22
(CAN_L) and body
earth.
OK: 4.0 V or less
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(5)Disconnect the negative battery terminal.
| caution |
Strictly observe the specified wiring harness repair
procedure.
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Q.
Is the check result normal?
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<4.0 V or less> Repair
joint connector (CAN4).
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NO : <More than 4.0 V> Repair the
wiring harness between joint connector
(CAN4) and the A/C-ECU connector.
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STEP 13. M.U.T.-III CAN bus diagnostics [A/C-ECU connector
disconnected]
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(1)Disconnect A/C-ECU connector and diagnose by using the
M.U.T.-III.
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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?
Go to Step
15.
Check
the A/C-ECU connector, and repair if necessary. If the A/C-ECU connector
is in good condition, go to Step 14.
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STEP 14. 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).
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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).
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STEP 15. M.U.T.-III CAN bus diagnostics [Gateway-ECU connector
disconnected]
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(1)Disconnect gateway-ECU connector, and diagnose by using
the M.U.T.-III.
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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?
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 gateway-ECU connector,
and repair if necessary. If the gateway-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)
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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).
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Check
the gateway-ECU connector, and repair if necessary. If the gateway-ECU
connector
is in good condition, replace the gateway-ECU.
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