Diagnosis Item
7: Diagnose shorts in the earth to CAN-C-Mid.
| 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.
- When the ETACS-ECU of vehicles without KOS is replaced, the encrypted code of the ignition
key needs to be registered to the ETACS-ECU. (If the encrypted code is not registered, the engine
cannot be started. Register the encrypted code as described in GROUP 54A, Immobilizer System - How
to Register Key ID
 .)
|
TROUBLE JUDGEMENT CONDITIONS
TROUBLESHOOTING HINTS
- Malfunction of the wiring harness
- Malfunction of the connector
- Malfunction of the ETACS-ECU
- Malfunction of the A/C-ECU
- Malfunction of the KOS-ECU <Vehicles with KOS>
- Malfunction of the OSS-ECU <Vehicles with OSS>
- Malfunction of the CAN box unit <vehicles with MMCS>
- Malfunction of the radio and CD player <vehicles with radio and CD player>
- Malfunction of the corner sensor/back sensor-ECU <vehicles with
reversing sensor system>
- Malfunction of the electric tailgate control unit <vehicles with electric
tailgate>
- Malfunction of the combination meter
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|
STEP 1. Check the CAN-C-Mid. Resistance measurement at
ETACS-ECU connector.
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|
| caution |
A digital multimeter should be used. For details refer to .
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| caution |
The test wiring harness should be used. For details refer
to .
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| 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-C-Mid that is defective.
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(1)Disconnect combination meter connector and ETACS-ECU connector, and measure the
resistance at harness side of ETACS-ECU connector.
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(2)| caution |
When measuring the resistance, disconnect the negative battery
terminal. For details refer to .
|
Ensure that the negative battery terminal is disconnected.
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(3)Resistance between ETACS-ECU connector terminal No.17 (CAN_H) and body
earth
OK: 1 kΩ or more
|
|
|
(4)Resistance between ETACS-ECU connector terminal No.16 (CAN_L) and body
earth
OK: 1 kΩ or more
|
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|
Q.
Is the check result normal?
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|
|
 <Both of the measurement results show 1 kΩ or more> Go
to Step 25.
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 <Either of CAN_H line or CAN_L line the measurement
results show less than 1 kΩ> Go to Step 2.
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STEP 2. Check the CAN-C-Mid between joint connector (CAN5) and the
ETACS-ECU. Resistance measurement at joint connector (CAN5).
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| caution |
A digital multimeter should be used. For details refer to .
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|
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|
| caution |
The test wiring harness should be used. For details refer
to .
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(1)Disconnect joint connector (CAN5), and measure at the wiring harness side.
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(2)| caution |
When measuring the resistance, disconnect the negative battery
terminal. For details refer to .
|
Ensure that the negative battery terminal is disconnected.
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(3)Resistance between joint connector (CAN5) terminal No.11 (CAN_H) and body
earth
OK: 1 kΩ or more
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(4)Resistance between joint connector (CAN5) terminal No.22 (CAN_L) and body
earth
OK: 1 kΩ or more
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|
Q.
Is the check result normal?
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|
<1 kΩ or more> Go to Step 3.
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<Less than 1 kΩ > Repair the wiring harness between joint
connector (CAN5) and the ETACS-ECU connector.
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STEP 3. Check the CAN-C-Mid between joint connector (CAN5) and the
A/C-ECU. Resistance measurement at joint connector (CAN5).
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|
| 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 (CAN5), 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.
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|
(3)Resistance between joint connector (CAN5) terminal No.6 (CAN_H) and body
earth
OK: 1 kΩ or more
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|
(4)Resistance between joint connector (CAN5) terminal No.17 (CAN_L) and body
earth
OK: 1 kΩ or more
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|
|
Q.
Is the check result normal?
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<1 kΩ or more> Go to Step 6.
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<Less than 1 kΩ > Go to Step 4.
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STEP 4. 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-C-Mid, 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 (CAN5) 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 5.
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STEP 5. M.U.T.-III CAN bus diagnostics (retest the system)
|
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|
Diagnose CAN-C-Mid, and check if M.U.T.-III screen shows normal state.
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|
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 ).
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|
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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.
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STEP 6. Check the CAN-C-Mid between joint connector (CAN5) and the
electric tailgate control unit <vehicles with electric tailgate>. Resistance
measurement at joint connector (CAN5).
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| note |
Steps 6 to 8 are only for vehicles with electric tailgate. On vehicles without it, go
to Step 9.
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|
|
| caution |
A digital multimeter should be used. For details refer to .
|
|
|
|
| caution |
The test wiring harness should be used. For details refer
to .
|
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(1)Disconnect joint connector (CAN5), and measure at the wiring harness side.
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(2)| caution |
When measuring the resistance, disconnect the negative battery
terminal. For details refer to .
|
Ensure that the negative battery terminal is disconnected.
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(3)Resistance between joint connector (CAN5) terminal No.8 (CAN_H) and body
earth
OK: 1 kΩ or more
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|
(4)Resistance between joint connector (CAN5) terminal No.19 (CAN_L) and body
earth
OK: 1 kΩ or more
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|
Q.
Is the check result normal?
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<1 kΩ or more> Go to Step 9.
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<Less than 1 kΩ > Go to Step 7.
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STEP 7. M.U.T.-III CAN bus diagnostics [electric tailgate control
unit connector disconnected]
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(1)Disconnect electric tailgate control unit connector, and diagnose by using the
M.U.T.-III.
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(2)Diagnose CAN-C-Mid, 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 (CAN5) and
the electric tailgate control unit connector.
Check the electric tailgate control unit connector, and repair if necessary. If
the electric tailgate control unit 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-C-Mid, and check if M.U.T.-III screen shows normal state.
|
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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 ).
|
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|
Check the electric tailgate control unit connector, and repair if necessary. If
the electric tailgate control unit connector is in good condition, replace the electric tailgate
control unit.
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STEP 9. Check the CAN-C-Mid between joint connector (CAN5) and the
corner sensor/back sensor-ECU <vehicles with reversing sensor system>.
Resistance measurement at joint connector (CAN5).
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| note |
Steps 9 to 11 are only for vehicles with reversing sensor system. On vehicles without
it, go to Step 12.
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| caution |
A digital multimeter should be used. For details refer to .
|
|
|
|
| caution |
The test wiring harness should be used. For details refer
to .
|
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|
|
(1)Disconnect joint connector (CAN5), 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.
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|
|
(3)Resistance between joint connector (CAN5) terminal No.4 (CAN_H) and body
earth
OK: 1 kΩ or more
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(4)Resistance between joint connector (CAN5) terminal No.15 (CAN_L) and body
earth
OK: 1 kΩ or more
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|
Q.
Is the check result normal?
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<1 kΩ or more> Go to Step 12.
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<Less than 1 kΩ > Go to Step 10.
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STEP 10. M.U.T.-III CAN bus diagnostics [corner sensor/back
sensor-ECU connector disconnected]
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(1)Disconnect corner sensor/back sensor-ECU connector, and diagnose by using
the M.U.T.-III.
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|
(2)Diagnose CAN-C-Mid, 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 (CAN5) and the corner sensor/back
sensor-ECU connector.
Check the corner sensor/back sensor-ECU connector, and repair if necessary.
If the corner sensor/back sensor-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-C-Mid, and check if M.U.T.-III screen shows normal state.
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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 ).
|
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|
Check the corner sensor/back sensor-ECU connector, and repair if necessary.
If the corner sensor/back sensor-ECU connector is in good condition, replace the corner
sensor/back sensor-ECU.
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STEP 12. Check the CAN-C-Mid between joint connector (CAN5) and the
radio and CD player. Resistance measurement at joint connector (CAN5).
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| note |
Steps 12 to 14 are only for vehicles with radio and CD player system. On vehicles without
it, go to Step 15.
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|
| 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 (CAN5), 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.
|
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|
(3)Resistance between joint connector (CAN5) terminal No.7 (CAN_H) and body
earth
OK: 1 kΩ or more
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|
(4)Resistance between joint connector (CAN5) terminal No.18 (CAN_L) and body
earth
OK: 1 kΩ or more
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|
(5)| caution |
Strictly observe the specified wiring harness repair procedure.
For details refer to .
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|
Q.
Is the check result normal?
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<1 kΩ or more> Go to Step 15.
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<Less than 1 kΩ > Go to Step 13.
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STEP 13. M.U.T.-III CAN bus diagnostics [radio and CD player
connector disconnected]
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|
|
(1)Disconnect radio and CD player connector, and diagnose by using the M.U.T.-III.
|
|
(2)Diagnose CAN-C-Mid, 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 (CAN5) and the radio and CD
player connector.
Check the radio and CD player connector, and repair if necessary. If the radio
and CD player 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)
|
|
|
Diagnose CAN-C-Mid, 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 radio and CD player connector, and repair if necessary. If the radio
and CD player connector is in good condition, replace the radio and CD player.
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STEP 15. Check the CAN-C-Mid between joint connector (CAN5) and the
CAN box unit and multivision display. Resistance measurement at joint connector (CAN5).
|
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| note |
Steps 15 to 17 are only for vehicles with MMCS. On vehicles without it, go to Step 18
.
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|
|
| 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 (CAN5), 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 (CAN5) terminal No.3 (CAN_H) and body
earth <CAN box unit>
OK: 1 kΩ or more
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|
(4)Resistance between joint connector (CAN5) terminal No.14 (CAN_L) and body
earth <CAN box unit>
OK: 1 kΩ or more
|
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|
(5)Resistance between joint connector (CAN5) terminal No.7 (CAN_H) and body
earth <multivision display>
OK: 1 kΩ or more
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|
(6)Resistance between joint connector (CAN5) terminal No.18 (CAN_L) and body
earth <multivision display>
OK: 1 kΩ or more
|
|
|
(7)| caution |
Strictly observe the specified wiring harness repair procedure.
For details refer to .
|
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|
Q.
Is the check result normal?
|
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|
<1 kΩ or more> Go to Step 18.
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<Less than 1 kΩ > Go to Step 16.
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STEP 16. M.U.T.-III CAN bus diagnostics [CAN box unit connector
disconnected]
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|
|
(1)Disconnect CAN box unit connector and multivision display connector, and diagnose
by using the M.U.T.-III.
|
|
(2)Diagnose CAN-C-Mid, 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 (CAN5) and the CAN box unit
connector and multivision display connector.
Check the CAN box unit connector and multivision display connector, and repair
if necessary. If the CAN box unit connector and multivision display connector is in good condition,
go to Step 17.
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|
STEP 17. M.U.T.-III CAN bus diagnostics (retest the system)
|
|
|
Diagnose CAN-C-Mid, 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 CAN box unit connector and multivision display connector, and repair
if necessary. If the CAN box unit connector and multivision display connector is in good condition,
replace the CAN box unit and multivision display.
|
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|
STEP 18. Check the CAN-C-Mid between joint connector (CAN5) and the
OSS-ECU. Resistance measurement at joint connector (CAN5).
|
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| note |
Steps 18 to 20 are only for vehicles with OSS. On vehicles without it, go to Step 21.
|
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|
|
| 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 (CAN5), 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 (CAN5) terminal No.10 (CAN_H) and body
earth
OK: 1 kΩ or more
|
|
|
(4)Resistance between joint connector (CAN5) 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 .
|
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|
Q.
Is the check result normal?
|
|
|
<1 kΩ or more> Go to Step 21.
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<Less than 1 kΩ > Go to Step 19.
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STEP 19. M.U.T.-III CAN bus diagnostics [OSS-ECU connector
disconnected]
|
|
|
(1)Disconnect OSS-ECU connector, and diagnose by using the M.U.T.-III.
|
|
(2)Diagnose CAN-C-Mid, 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 (CAN5) and the OSS-ECU connector.
Check the OSS-ECU connector, and repair if necessary. If the OSS-ECU connector
is in good condition, go to Step 20.
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|
STEP 20. M.U.T.-III CAN bus diagnostics (retest the system)
|
|
|
Diagnose CAN-C-Mid, 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 OSS-ECU connector, and repair if necessary. If the OSS-ECU connector
is in good condition, replace the OSS-ECU.
|
|
|
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|
STEP 21. Check the CAN-C-Mid between joint connector (CAN5) and the
KOS-ECU. Resistance measurement at joint connector (CAN5).
|
|
|
| note |
Steps 21 to 23 are only for vehicles with KOS. On vehicles without it, go to Step 24.
|
|
|
|
| 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 (CAN5), 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 (CAN5) terminal No.5 (CAN_H) and body
earth
OK: 1 kΩ or more
|
|
|
(4)Resistance between joint connector (CAN5) 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 24.
|
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<Less than 1 kΩ > Go to Step 22.
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STEP 22. M.U.T.-III CAN bus diagnostics [KOS-ECU connector
disconnected]
|
|
|
(1)Disconnect KOS-ECU connector, and diagnose by using the M.U.T.-III.
|
|
(2)Diagnose CAN-C-Mid, 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 (CAN5) and the KOS-ECU connector.
Check the KOS-ECU connector, and repair if necessary. If the KOS-ECU connector
is in good condition, go to Step 23.
|
|
|
STEP 23. M.U.T.-III CAN bus diagnostics (retest the system)
|
|
|
Diagnose CAN-C-Mid, 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-ECU connector, and repair if necessary. If the KOS-ECU connector
is in good condition, replace the KOS-ECU.
|
|
|
|
|
|
STEP 24. Check the CAN-C-Mid between joint connector (CAN5) and the
combination meter. Resistance measurement at joint connector (CAN5).
|
|
|
| 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 (CAN5), 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 (CAN5) terminal No.9 (CAN_H) and body
earth
OK: 1 kΩ or more
|
|
|
(4)Resistance between joint connector (CAN5) terminal No.20 (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 intermediate connector C-26.
|
|
|
|
|
|
<Less than 1 kΩ > Repair the wiring harness between joint
connector (CAN5) and the combination meter connector.
|
|
|
|
|
|
STEP 25. 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.
|
|
(2)Diagnose CAN-C-Mid, 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 27
Check the combination meter connector, and repair if necessary. If the combination
meter connector is in good condition, go to Step 26.
|
|
|
STEP 26. M.U.T.-III CAN bus diagnostics (retest the system)
|
|
|
Diagnose CAN-C-Mid, and check if M.U.T.-III screen shows normal state.
|
|
|
Q.
Is the check result normal?
|
|
|
The trouble can be an intermittent malfunction (Refer to GROUP 00 - How
to use Troubleshooting/inspection Service Points - How to Cope with Intermittent
Malfunction ).
|
|
|
|
|
|
Check the combination meter connector, and repair if necessary. If the combination
meter connector is in good condition, replace the combination meter.
|
|
|
|
|
|
STEP 27. 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.
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(2)Diagnose CAN-C-Mid, 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 28.
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STEP 28. M.U.T.-III CAN bus diagnostics (retest the system)
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Diagnose CAN-C-Mid, 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 ETACS-ECU connector, and repair if necessary. If the ETACS-ECU connector
is in good condition, replace the ETACS-ECU.
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