STEP 1. Check the CAN-C. Voltage measurement at data link 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 that is defective. |
(1) Disconnect ECM connector and ETACS-ECU connector, and measure the voltage at the harness side of data link connector.
(2) Connect the negative battery terminal, and turn the ignition switch to the ON position.
(3) Voltage between data link connector terminal No.6 (CAN_H) and body groundOK: 4.0 V or less
(4) Voltage between data link connector terminal No.14 (CAN_L) and body groundOK: 4.0 V or less
(5) Disconnect the negative battery terminal.
Is the check result normal?
<Both of the measurement results show 4.0 V or less> Go to Step 40. <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. Voltage measurement at C-126 intermediate connector.
caution | A digital multimeter should be used. For details refer to . |
caution | The test wiring harness should be used. For details refer to . |
(1) Disconnect the intermediate connector, and measure at its female-side intermediate connector (at the front wiring harness side).
(2) Connect the negative battery terminal, and turn the ignition switch to the ON position.
(3) Voltage between C-126 intermediate connector terminal No.15 (CAN_H) and body groundOK: 4.0 V or less
(4) Voltage between C-126 intermediate connector terminal No.16 (CAN_L) and body groundOK: 4.0 V or less
(5) Disconnect the negative battery terminal.
Is the check result normal?
<4.0 V or less> Go to Step 17. <More than 4.0 V> Go to Step 3.
STEP 3. Check the CAN-C between joint connector (CAN1) and the ECM. Voltage measurement at joint connector (CAN1).
note | Step 3 is only for vehicles without ACC. On vehicles with it, go to Step 4. |
caution | A digital multimeter should be used. For details refer to . |
caution | The test wiring harness should be used. For details refer to . |
(1) Disconnect joint connector (CAN1), and measure at the wiring harness side.
(2) Connect the negative battery terminal, and turn the ignition switch to the ON position.
(3) Voltage between joint connector (CAN1) terminal No.8 (CAN_H) and body groundOK: 4.0 V or less
(4) Voltage between joint connector (CAN1) terminal No.17 (CAN_L) and body groundOK: 4.0 V or less
caution | Strictly observe the specified wiring harness repair procedure. For details refer to . |
(5) Disconnect the negative battery terminal.
Is the check result normal?
: <4.0 V or less> Go to Step 8. <More than 4.0 V> Repair the wiring harness between joint connector (CAN1) and the ECM connector.
STEP 4. Check the CAN-C between joint connector (CAN1) and the ECM. Voltage measurement at joint connector (CAN1).
note | Step 4 is only for vehicles with ACC. On vehicles without it, go to Step 5. |
caution | A digital multimeter should be used. For details refer to . |
caution | The test wiring harness should be used. For details refer to . |
(1) Disconnect joint connector (CAN1), and measure at the wiring harness side.
(2) Connect the negative battery terminal, and turn the ignition switch to the ON position.
(3) Voltage between joint connector (CAN1) terminal No.8 (CAN_H) and body groundOK: 4.0 V or less
(4) Voltage between joint connector (CAN1) terminal No.17 (CAN_L) and body groundOK: 4.0 V or less
(5) Disconnect the negative battery terminal.
Is the check result normal?
: <4.0 V or less> Go to Step 8. <More than 4.0 V> Go to Step 5.
STEP 5. Check the CAN-C between joint connector (CAN2) and the ACC-ECU. Voltage measurement at joint connector (CAN2).
note | Step 5, 6 and 7 are only for vehicles with ACC. On vehicles without it, go to Step 8. |
caution | A digital multimeter should be used. For details refer to . |
caution | The test wiring harness should be used. For details refer to . |
(1) Disconnect joint connector (CAN2), and measure at the wiring harness side.
(2) Connect the negative battery terminal, and turn the ignition switch to the ON position.
(3) Voltage between joint connector (CAN2) terminal No.9 (CAN_H) and body groundOK: 4.0 V or less
(4) Voltage between joint connector (CAN2) terminal No.20 (CAN_L) and body groundOK: 4.0 V or less
(5) Disconnect the negative battery terminal.caution | Strictly observe the specified wiring harness repair procedure. For details refer to . |
Is the check result normal?
<4.0 V or less> Repair the wiring harness between joint connector (CAN1) and the ECM connector. <More than 4.0 V> Go to Step 6.
STEP 6. Scan tool (M.U.T.-III) CAN bus diagnostics [ACC-ECU connector disconnected]
(1) Disconnect ACC-ECU connector, and diagnose by using the scan tool (M.U.T.-III).
(2) Diagnose CAN-C, and check if scan tool (M.U.T.-III) screen is as shown in the illustration.
Does scan tool (M.U.T.-III) screen correspond to the illustration?
Repair the wiring harness between joint connector (CAN2) and the ACC-ECU connector. Check the ACC-ECU connector, and repair if necessary. If the ACC-ECU connector is in good condition, go to Step 7.
STEP 7. Scan tool (M.U.T.-III) CAN bus diagnostics (retest the system)
STEP 8. Check the CAN-C between joint connector (CAN1) and the TCM. Voltage measurement at joint connector (CAN1).
caution | A digital multimeter should be used. For details refer to . |
caution | The test wiring harness should be used. For details refer to . |
(1) Disconnect joint connector (CAN1), and measure at the wiring harness side.
(2) 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 ground OK: 4.0 V or less
(4) Voltage between joint connector (CAN1) terminal No.13 (CAN_L) and body groundOK: 4.0 V or less
(5) Disconnect the negative battery terminal.
Is the check result normal?
<4.0 V or less> Go to Step 11. <More than 4.0 V> Go to Step 9.
STEP 9. Scan tool (M.U.T.-III) CAN bus diagnostics [TCM connector disconnected]
STEP 10. Scan tool (M.U.T.-III) CAN bus diagnostics (retest the system)
STEP 11. Check the CAN-C between joint connector (CAN1) and the EPS-ECU. Voltage measurement at joint connector (CAN1).
caution | A digital multimeter should be used. For details refer to . |
caution | The test wiring harness should be used. For details refer to . |
(1) Disconnect joint connector (CAN1), and measure at the wiring harness side.
(2) 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 groundOK: 4.0 V or less
(4) Voltage between joint connector (CAN1) terminal No.15 (CAN_L) and body groundOK: 4.0 V or less
(5) Disconnect the negative battery terminal.
Is the check result normal?
<4.0 V or less> Go to Step 14. <More than 4.0 V> Go to Step 12.
STEP 12. Scan tool (M.U.T.-III) CAN bus diagnostics [EPS-ECU connector disconnected]
STEP 13. Scan tool (M.U.T.-III) CAN bus diagnostics (retest the system)
STEP 14. Check the CAN-C between joint connector (CAN1) and the ASC-ECU. Voltage measurement at joint connector (CAN1).
caution | A digital multimeter should be used. For details refer to . |
caution | The test wiring harness should be used. For details refer to . |
(1) Disconnect joint connector (CAN1), and measure at the wiring harness side.
(2) 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 groundOK: 4.0 V or less
(4) Voltage between joint connector (CAN1) terminal No.16 (CAN_L) and body groundOK: 4.0 V or less
caution | Strictly observe the specified wiring harness repair procedure. For details refer to . |
(5) Disconnect the negative battery terminal.
Is the check result normal?
<4.0 V or less> Repair intermediate connector C-126, or the wiring harness between joint connector (CAN1) and the intermediate connector C-126. <More than 4.0 V> Go to Step 15.
STEP 15. Scan tool (M.U.T.-III) CAN bus diagnostics [ASC-ECU connector disconnected]
STEP 16. Scan tool (M.U.T.-III) CAN bus diagnostics (retest the system)
STEP 17. Check the CAN-C between joint connector (CAN3) and the ETACS-ECU. Voltage measurement at joint connector (CAN3).
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 (CAN3), 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 (CAN3) terminal No.11 (CAN_H) and body groundOK: 4.0 V or less
(4) Voltage between joint connector (CAN3) terminal No.22 (CAN_L) and body groundOK: 4.0 V or less
(5) Disconnect the negative battery terminal.caution | Strictly observe the specified wiring harness repair procedure. For details refer to . |
Is the check result normal?
<4.0 V or less> Go to Step 18. : <More than 4.0 V> Repair the wiring harness between joint connector (CAN3) and the ETACS-ECU connector.
STEP 18. Check the CAN-C between joint connector (CAN3) and the AWD-ECU <Vehicles without S-AWC> or AWC-ECU <Vehicles with S-AWC>. Voltage measurement at joint connector (CAN3).
note | Step 18, 19 and 20 are only for vehicles with AWD. On vehicles without it, go to Step 21. |
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 (CAN3), 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 (CAN3) terminal No.5 (CAN_H) and body groundOK: 4.0 V or less
(4) Voltage between joint connector (CAN3) terminal No.16 (CAN_L) and body groundOK: 4.0 V or less
(5) Disconnect the negative battery terminal.
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. Scan tool (M.U.T.-III) CAN bus diagnostics [AWD-ECU <Vehicles without S-AWC> or AWC-ECU <Vehicles with S-AWC> connector disconnected]
STEP 20. Scan tool (M.U.T.-III) CAN bus diagnostics (retest the system)
STEP 21. Check the CAN-C between joint connector (CAN3) and the column switch. Voltage measurement at joint connector (CAN3).
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 (CAN3), 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 (CAN3) terminal No.6 (CAN_H) and body groundOK: 4.0 V or less
(4) Voltage between joint connector (CAN3) terminal No.17 (CAN_L) and body groundOK: 4.0 V or less
(5) Disconnect the negative battery terminal.
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. Scan tool (M.U.T.-III) CAN bus diagnostics [column switch connector disconnected]
STEP 23. Scan tool (M.U.T.-III) CAN bus diagnostics (retest the system)
STEP 24. Check the CAN-C between joint connector (CAN3) and the occupant classification-ECU. Voltage measurement at joint connector (CAN3).
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 (CAN3), 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 (CAN3) terminal No.4 (CAN_H) and body groundOK: 4.0 V or less
(4) Voltage between joint connector (CAN3) terminal No.15 (CAN_L) and body groundOK: 4.0 V or less
(5) Disconnect the negative battery terminal.
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. Scan tool (M.U.T.-III) CAN bus diagnostics [occupant classification-ECU connector disconnected]
STEP 26. Scan tool (M.U.T.-III) CAN bus diagnostics (retest the system)
STEP 27. Check the CAN-C between joint connector (CAN3) and the FCM/LDW/AHB-ECU. Voltage measurement at joint connector (CAN3).
note | Step 27, 28 and 29 are only for vehicles with FCM. On vehicles without it, go to Step 30. |
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 (CAN3), 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 (CAN3) terminal No.7 (CAN_H) and body groundOK: 4.0 V or less
(4) Voltage between joint connector (CAN3) terminal No.18 (CAN_L) and body groundOK: 4.0 V or less
(5) Disconnect the negative battery terminal.
Is the check result normal?
<4.0 V or less> Go to Step 30. <More than 4.0 V> Go to Step 28.
STEP 28. Scan tool (M.U.T.-III) CAN bus diagnostics [FCM/LDW/AHB-ECU connector disconnected]
STEP 29. Scan tool (M.U.T.-III) CAN bus diagnostics (retest the system)
STEP 30. Check the CAN-C between joint connector (CAN3) and the SRS-ECU. Voltage measurement at joint connector (CAN3).
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 (CAN3), 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 (CAN3) terminal No.8 (CAN_H) and body groundOK: 4.0 V or less
(4) Voltage between joint connector (CAN3) terminal No.19 (CAN_L) and body groundOK: 4.0 V or less
(5) Disconnect the negative battery terminal.
Is the check result normal?
<4.0 V or less> Go to Step 33. <More than 4.0 V> Go to Step 31.
STEP 31. Scan tool (M.U.T.-III) CAN bus diagnostics [SRS-ECU connector disconnected]
STEP 32. Scan tool (M.U.T.-III) CAN bus diagnostics (retest the system)
STEP 33. Check the CAN-C between joint connector (CAN3) and the electric parking brake ECU. Voltage measurement at joint connector (CAN3).
note | Step 33, 34 and 35 are only for vehicles with electric parking brake system. On vehicles without it, go to Step 36. |
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 (CAN3), 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 (CAN3) terminal No.1 (CAN_H) and body groundOK: 4.0 V or less
(4) Voltage between joint connector (CAN3) terminal No.12 (CAN_L) and body groundOK: 4.0 V or less
(5) Disconnect the negative battery terminal.
Is the check result normal?
<4.0 V or less> Go to Step 36. <More than 4.0 V> Go to Step 34.
STEP 34. Scan tool (M.U.T.-III) CAN bus diagnostics [electric parking brake ECU connector disconnected]
STEP 35. Scan tool (M.U.T.-III) CAN bus diagnostics (retest the system)
STEP 36. Check the CAN-C between joint connector (CAN3) and the gateway-ECU. Voltage measurement at joint connector (CAN3).
note | Step 36, 37 and 38 are only for vehicles with Blind Spot Warning [BSW] (with Lane Change Assist) system. On vehicles without it, go to Step 39. |
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 (CAN3), 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 (CAN3) terminal No.2 (CAN_H) and body groundOK: 4.0 V or less
(4) Voltage between joint connector (CAN3) terminal No.13 (CAN_L) and body groundOK: 4.0 V or less
(5) Disconnect the negative battery terminal.
Is the check result normal?
<4.0 V or less> Go to Step 39. <More than 4.0 V> Go to Step 37.
STEP 37. Scan tool (M.U.T.-III) CAN bus diagnostics [gateway-ECU connector disconnected]
STEP 38. Scan tool (M.U.T.-III) CAN bus diagnostics (retest the system)
STEP 39. Check the CAN-C between joint connector (CAN3) and the data link connector. Voltage measurement at joint connector (CAN3).
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 (CAN3), 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 (CAN3) terminal No.9 (CAN_H) and body groundOK: Less than 1.0 V
(4) Voltage between joint connector (CAN3) terminal No.20 (CAN_L) and body groundOK: Less than 1.0 V
(5) Disconnect the negative battery terminal.caution | Strictly observe the specified wiring harness repair procedure. For details refer to . |
Is the check result normal?
<Less than 1.0 V> Repair the intermediate connector C-126, or the wiring harness between joint connector (CAN3) and the intermediate connector C-126. <1.0 V or more> Repair the data link connector, or the wiring harness between joint connector (CAN3) and the data link connector.
STEP 40. Scan tool (M.U.T.-III) CAN bus diagnostics [ECM connector disconnected]
STEP 41. Scan tool (M.U.T.-III) CAN bus diagnostics (retest the system)
STEP 42. Scan tool (M.U.T.-III) CAN bus diagnostics [ETACS-ECU connector disconnected]
STEP 43. Scan tool (M.U.T.-III) CAN bus diagnostics (retest the system)