Diagnosis Item 6: Diagnose shorts in the power supply 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.

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




DIAGNOSIS PROCEDURE


STEP 1. Check the CAN-C-Mid. Voltage measurement at ETACS-ECU 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 power supply in either CAN_H line or CAN_L line. Thus, in the following steps, check the CAN-C-Mid that is defective.
(1)Disconnect combination meter connector and ETACS-ECU connector, and measure the voltage at the harness side of ETACS-ECU connector.
(2)Connect the negative battery terminal, and turn on the power supply mode of the electric motor switch.
(3)Voltage between ETACS-ECU connector terminal No.17 (CAN_H) and body earth
OK: 4.0 V or less
(4)Voltage between ETACS-ECU connector terminal No.16 (CAN_L) and body earth
OK: 4.0 V or less
(5)Disconnect the negative auxiliary battery terminal.

Q. Is the check result normal?

<Both of the measurement results show 4.0 V or less> Go to Step 28.
<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-C-Mid between joint connector (CAN5) and the ETACS-ECU. Voltage 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)Connect the negative battery terminal, and turn on the power supply mode of the electric motor switch.
(3)Voltage between joint connector (CAN5) terminal No.11 (CAN_H) and body earth
OK: 4.0 V or less
(4)Voltage between joint connector (CAN5) terminal No.22 (CAN_L) and body earth
OK: 4.0 V or less
(5)Disconnect the negative auxiliary battery terminal.
caution Strictly observe the specified wiring harness repair procedure. For details refer to .

Q. Is the check result normal?

<4.0 V or less> Go to Step 3.
<More than 4.0 V> Repair the wiring harness between joint connector (CAN5) and the ETACS-ECU connector.

STEP 3. Check the CAN-C-Mid between joint connector (CAN5) and the A/C-ECU. Voltage 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)Connect the negative battery terminal, and turn on the power supply mode of the electric motor switch.
(3)Voltage between joint connector (CAN5) terminal No.6 (CAN_H) and body earth
OK: 4.0 V or less
(4)Voltage between joint connector (CAN5) terminal No.17 (CAN_L) and body earth
OK: 4.0 V or less
(5)Disconnect the negative auxiliary battery terminal.

Q. Is the check result normal?

<4.0 V or less> Go to Step 6.
<More than 4.0 V> Go to Step 4.

STEP 4. 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.

(2)Diagnose CAN-C-Mid, and check if M.U.T.-III screen is as shown in the illustration.
caution Strictly observe the specified wiring harness repair procedure. For details refer to .

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.

STEP 5. 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 A/C-ECU connector, and repair if necessary. If the A/C-ECU connector is in good condition, replace the A/C-ECU.

STEP 6. Check the CAN-C-Mid between joint connector (CAN5) and the electric tailgate control unit. Voltage 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)Connect the negative battery terminal, and turn on the power supply mode of the electric motor switch.
(3)Voltage between joint connector (CAN5) terminal No.8 (CAN_H) and body earth
OK: 4.0 V or less
(4)Voltage between joint connector (CAN-L) terminal No.19 (CAN_L) and body earth
OK: 4.0 V or less
(5)Disconnect the negative auxiliary battery terminal.

Q. Is the check result normal?

<4.0 V or less> Go to Step 9.
<More than 4.0 V> Go to Step 7.

STEP 7. M.U.T.-III CAN bus diagnostics [electric tailgate control unit connector disconnected]


(1)Disconnect electric tailgate control unit 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.
caution Strictly observe the specified wiring harness repair procedure. For details refer to .

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.

STEP 8. 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 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.

STEP 9. Check the CAN-C-Mid between joint connector (CAN5) and the corner sensor/back sensor-ECU <vehicles with reversing sensor system>. Voltage measurement at joint connector (CAN5).


note Steps 9 to 11 are only for vehicles with reversing sensor system. On vehicles without it, go to Step 12.
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)Connect the negative battery terminal, and turn on the power supply mode of the electric motor switch.
(3)Voltage between joint connector (CAN5) terminal No.4 (CAN_H) and body earth
OK: 4.0 V or less
(4)Voltage between joint connector (CAN5) terminal No.15 (CAN_L) and body earth
OK: 4.0 V or less
(5)Disconnect the negative auxiliary battery terminal.

Q. Is the check result normal?

<4.0 V or less> Go to Step 12.
<More than 4.0 V> Go to Step 10.

STEP 10. M.U.T.-III CAN bus diagnostics [corner sensor/back sensor-ECU connector disconnected]


(1)Disconnect corner sensor/back sensor-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.
caution Strictly observe the specified wiring harness repair procedure. For details refer to .

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 .

STEP 11. 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 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.

STEP 12. Check the CAN-C-Mid between joint connector (CAN5) and the radio and CD player. Voltage measurement at joint connector (CAN5).


note Steps 12 to 14 are only for vehicles with radio and CD player system. On vehicles without it, go to Step 15.
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)Connect the negative battery terminal, and turn on the power supply mode of the electric motor switch.
(3)Voltage between joint connector (CAN5) terminal No.7 (CAN_H) and body earth
OK: 4.0 V or less
(4)Voltage between joint connector (CAN5) terminal No.18 (CAN_L) and body earth
OK: 4.0 V or less
(5)Disconnect the negative auxiliary battery terminal.

Q. Is the check result normal?

<4.0 V or less> Go to Step 15.
<More than 4.0 V> Go to Step 13.

STEP 13. M.U.T.-III CAN bus diagnostics [radio and CD player connector disconnected]


(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.
caution Strictly observe the specified wiring harness repair procedure. For details refer to .

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.

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.

STEP 15. Check the CAN-C-Mid between joint connector (CAN5) and the CAN box unit and multivision display. Voltage measurement at joint connector (CAN5).


note Steps 15 to 17 are only for vehicles with MMCS. On vehicles without it, go to Step 18 .
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)Connect the negative battery terminal, and turn on the power supply mode of the electric motor switch.
(3)Voltage between joint connector (CAN5) terminal No.3 (CAN_H) and body earth <CAN box unit>
OK: 4.0 V or less
(4)Voltage between joint connector (CAN5) terminal No.14 (CAN_L) and body earth <CAN box unit>
OK: 4.0 V or less
(5)Voltage between joint connector (CAN5) terminal No.7 (CAN_H) and body earth <multivision display>
OK: 4.0 V or less
(6)Voltage between joint connector (CAN5) terminal No.18 (CAN_L) and body earth <multivision display>
OK: 4.0 V or less
(7)Disconnect the negative auxiliary battery terminal.

Q. Is the check result normal?

<4.0 V or less> Go to Step 18.
NO : <More than 4.0 V> Go to Step 16.

STEP 16. M.U.T.-III CAN bus diagnostics [CAN box unit connector and multivision display connector disconnected]


(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.
caution Strictly observe the specified wiring harness repair procedure. For details refer to .

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.

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.

STEP 18. Check the CAN-C-Mid between joint connector (CAN5) and the OSS-ECU. Voltage 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)Connect the negative battery terminal, and turn on the power supply mode of the electric motor switch.
(3)Voltage between joint connector (CAN5) terminal No.10 (CAN_H) and body earth
OK: 4.0 V or less
(4)Voltage between joint connector (CAN5) terminal No.21 (CAN_L) and body earth
OK: 4.0 V or less
(5)Disconnect the negative auxiliary battery terminal.

Q. Is the check result normal?

<4.0 V or less> Go to Step 21.
<More than 4.0 V> Go to Step 19.

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.
caution Strictly observe the specified wiring harness repair procedure. For details refer to .

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.

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.

STEP 21. Check the CAN-C-Mid between joint connector (CAN5) and the KOS-ECU. Voltage 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)Connect the negative battery terminal, and turn on the power supply mode of the electric motor switch.
(3)Voltage between joint connector (CAN5) terminal No.5 (CAN_H) and body earth
OK: 4.0 V or less
(4)Voltage between joint connector (CAN5) terminal No.16 (CAN_L) and body earth
OK: 4.0 V or less
(5)Disconnect the negative auxiliary battery terminal.

Q. Is the check result normal?

<4.0 V or less> Go to Step 24.
<More than 4.0 V> Go to Step 22.

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.
caution Strictly observe the specified wiring harness repair procedure. For details refer to .

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 EV remote-ECU. Voltage measurement at joint connector (CAN5).


note Steps 24 to 26 are only for vehicles with KOS. On vehicles without it, go to Step 27.
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)Connect the negative battery terminal, and turn on the power supply mode of the electric motor switch.
(3)Voltage between joint connector (CAN5) terminal No.2 (CAN_H) and body earth
OK: 4.0 V or less
(4)Voltage between joint connector (CAN5) terminal No.13 (CAN_L) and body earth
OK: 4.0 V or less
(5)Disconnect the negative auxiliary battery terminal.

Q. Is the check result normal?

<4.0 V or less> Go to Step 27.
<More than 4.0 V> Go to Step 25.

STEP 25. M.U.T.-III CAN bus diagnostics [EV remote-ECU connector disconnected]


(1)Disconnect EV remote-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.
caution Strictly observe the specified wiring harness repair procedure. For details refer to .

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 EV remote-ECU connector.

Check the EV remote-ECU connector, and repair if necessary. If the EV remote-ECU 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 EV remote-ECU connector, and repair if necessary. If the EV remote-ECU connector is in good condition, replace the EV remote-ECU.

STEP 27. Check the CAN-C-Mid between joint connector (CAN5) and the combination meter. Voltage 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)Connect the negative battery terminal, and turn on the power supply mode of the electric motor switch.
(3)Voltage between joint connector (CAN5) terminal No.9 (CAN_H) and body earth
OK: 4.0 V or less
(4)Voltage between joint connector (CAN5) terminal No.20 (CAN_L) and body earth
OK: 4.0 V or less
(5)Disconnect the negative auxiliary battery terminal.
caution Strictly observe the specified wiring harness repair procedure. For details refer to .

Q. Is the check result normal?

<4.0 V or less> Repair joint connector C-26.
<More than 4.0 V> Repair the wiring harness between joint connector (CAN5) and the combination meter connector.

STEP 28. 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 30.

Check the combination meter connector, and repair if necessary. If the combination meter connector is in good condition, go to Step 29.

STEP 29. 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 30. 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.

(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 31.

STEP 31.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 ETACS-ECU connector, and repair if necessary. If the ETACS-ECU connector is in good condition, replace the ETACS-ECU.