54C-DIAGNOSTICS ITEM 3

Diagnostic Item 3: Diagnose shorts in the ground to CAN-C.

caution

When servicing a CAN bus line, ground 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 JUDGMENT CONDITIONS

The scan tool (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 less than 1.0 V.

TROUBLESHOOTING HINTS

Malfunction of the wiring harness
Malfunction of the connector
Malfunction of the ETACS-ECU
Malfunction of the gateway-ECU <Vehicles with Blind Spot Warning [BSW] (with Lane Change Assist) system>
Malfunction of the SRS-ECU
Malfunction of the column switch assembly (steering wheel sensor)
Malfunction of the electric parking brake ECU <Vehicles with electric parking brake>
Malfunction of the AWD-ECU <Vehicles without S-AWC> or AWC-ECU <Vehicles with S-AWC>
Malfunction of the FCM/LDW/AHB-ECU <Vehicles with FCM>
Malfunction of the ASC-ECU
Malfunction of the EPS-ECU
Malfunction of the transaxle control module (TCM)
Malfunction of the occupant classification-ECU
Malfunction of the ACC-ECU <Vehicles with ACC>
Malfunction of the engine control module (ECM)

DIAGNOSIS

STEP 1. Check the CAN-C. Resistance 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 ground 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 resistance at harness side of data link connector.

(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 data link connector terminal No.6 (CAN_H) and body ground

OK: 1 kΩ or more

(4) Resistance between data link connector terminal No.14 (CAN_L) and body ground

OK: 1 kΩ or more

Is the check result normal?

<Both of the measurement results show 1 kΩ or more> Go to Step 40

<Either of CAN_H line or CAN_L line the measurement results show less than 1 kΩ> Go to Step 2

STEP 2. Check the CAN-C. Resistance 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)

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 C-126 intermediate connector terminal No.15 (CAN_H) and body ground

OK: 1 kΩ or more

(4) Resistance between C-126 intermediate connector terminal No.16 (CAN_L) and body ground

OK: 1 kΩ or more

Is the check result normal?

<1 kΩ or more> Go to Step 17

<Less than 1 kΩ > Go to Step 3

STEP 3. Check the CAN-C between joint connector (CAN1) and the ECM. Resistance 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)

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 (CAN1) terminal No.8 (CAN_H) and body ground

OK: 1 kΩ or more

(4) Resistance between joint connector (CAN1) terminal No.17 (CAN_L) and body ground

OK: 1 kΩ or more

caution

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

Is the check result normal?

: <1 kΩ or more> Go to Step 8

<Less than 1 kΩ > 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. Resistance 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)

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 (CAN1) terminal No.8 (CAN_H) and body ground

OK: 1 kΩ or more

(4) Resistance between joint connector (CAN1) terminal No.17 (CAN_L) and body ground

OK: 1 kΩ or more

Is the check result normal?

: <1 kΩ or more> Go to Step 8

<Less than 1 kΩ> Go to Step 5

STEP 5. Check the CAN-C between joint connector (CAN2) and the ACC-ECU. Resistance 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)

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 (CAN2) terminal No.9 (CAN_H) and body ground

OK: 1 kΩ or more

(4) Resistance between joint connector (CAN2) terminal No.20 (CAN_L) and body ground

OK: 1 kΩ or more

caution

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

Is the check result normal?

<1 kΩ or more> Repair the wiring harness between joint connector (CAN1) and the ECM connector.

<Less than 1 kΩ > 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 bus lines, and check if scan tool (M.U.T.-III) screen is as shown in the illustration.

caution

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

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)

Diagnose CAN-C, and check if scan tool (M.U.T.-III) screen shows normal state.

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

STEP 8. Check the CAN-C between joint connector (CAN1) and the TCM. Resistance 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)

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 (CAN1) terminal No.4 (CAN_H) and body ground

OK: 1 kΩ or more

(4) Resistance between joint connector (CAN1) terminal No.13 (CAN_L) and body ground

OK: 1 kΩ or more

Is the check result normal?

<1 kΩ or more> Go to Step 11

<Less than 1 kΩ > Go to Step 9

STEP 9. Scan tool (M.U.T.-III) CAN bus diagnostics [TCM connector disconnected]

(1) Disconnect TCM connector, and diagnose by using the scan tool (M.U.T.-III).

(2) Diagnose CAN bus lines, and check if scan tool (M.U.T.-III) screen is as shown in the illustration.

caution

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

Does scan tool (M.U.T.-III) screen correspond to the illustration?

Repair the wiring harness between joint connector (CAN1) and the TCM connector.

Check the TCM connector, and repair if necessary. If the TCM connector is in good condition, go to Step 10

STEP 10. Scan tool (M.U.T.-III) CAN bus diagnostics (retest the system)

Diagnose CAN-C, and check if scan tool (M.U.T.-III) screen shows normal state.

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 TCM connector, and repair if necessary. If the TCM connector is in good condition, replace the TCM.

STEP 11. Check the CAN line between joint connector (CAN1) and the EPS-ECU. Resistance 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)

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 (CAN1) terminal No.6 (CAN_H) and body ground

OK: 1 kΩ or more

(4) Resistance between joint connector (CAN1) terminal No.15 (CAN_L) and body ground

OK: 1 kΩ or more

Is the check result normal?

<1 kΩ or more> Go to Step 14

<Less than 1 kΩ > Go to Step 12

STEP 12. Scan tool (M.U.T.-III) CAN bus diagnostics [EPS-ECU connector disconnected]

(1) Disconnect EPS-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.

caution

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

Does scan tool (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 (CAN1) and the EPS-ECU connector.

Check the EPS-ECU connector, and repair if necessary. If the EPS-ECU connector is in good condition, go to Step 13

STEP 13. Scan tool (M.U.T.-III) CAN bus diagnostics (retest the system)

Diagnose CAN-C, and check if scan tool (M.U.T.-III) screen shows normal state.

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

STEP 14. Check the CAN-C between joint connector (CAN1) and the ASC-ECU. Resistance 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)

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 (CAN1) terminal No.7 (CAN_H) and body ground

OK: 1 kΩ or more

(4) Resistance between joint connector (CAN1) terminal No.16 (CAN_L) and body ground

OK: 1 kΩ or more

caution

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

Is the check result normal?

<1 kΩ or more> Repair intermediate connector C-126, or the wiring harness between joint connector (CAN1) and intermediate connector C-126.

<Less than 1 kΩ > Go to Step 15

STEP 15. Scan tool (M.U.T.-III) CAN bus diagnostics [ASC-ECU connector disconnected]

(1) Disconnect ASC-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.

caution

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

Does scan tool (M.U.T.-III) screen correspond to the illustration?

Repair the wiring harness between joint connector (CAN1) and the ASC-ECU connector.

Check the ASC-ECU connector, and repair if necessary. If the ASC-ECU connector is in good condition, go to Step 16

STEP 16. Scan tool (M.U.T.-III) CAN bus diagnostics (retest the system)

Diagnose CAN-C, and check if scan tool (M.U.T.-III) screen shows normal state.

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

STEP 17. Check CAN line between joint connector (CAN3) and the ETACS-ECU. Resistance 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)

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 (CAN3) terminal No.11 (CAN_H) and body ground

OK: 1 kΩ or more

(4) Resistance between joint connector (CAN3) terminal No.22 (CAN_L) and body ground

OK: 1 kΩ or more

(5)

caution

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

Is the check result normal?

<1 kΩ or more> Go to Step 18

: <Less than 1 kΩ > 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>. Resistance 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)

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 (CAN3) terminal No.5 (CAN_H) and body ground

OK: 1 kΩ or more

(4) Resistance between joint connector (CAN3) terminal No.16 (CAN_L) and body ground

OK: 1 kΩ or more

Is the check result normal?

<1 kΩ or more> Go to Step 21

<Less than 1 kΩ > 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]

(1) Disconnect AWD-ECU <Vehicles without S-AWC> or AWC-ECU <Vehicles with S-AWC> connector, and diagnose by using the scan tool (M.U.T.-III).

(2) Diagnose CAN bus lines, and check if scan tool (M.U.T.-III) screen is as shown in the illustration.

caution

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

Does scan tool (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 (CAN3) and the AWD-ECU <Vehicles without S-AWC> or AWC-ECU <Vehicles with S-AWC> connector.

Check the AWD-ECU <Vehicles without S-AWC> or AWC-ECU <Vehicles with S-AWC> connector, and repair if necessary. If the AWD-ECU <Vehicles without S-AWC> or AWC-ECU <Vehicles with S-AWC> connector is in good condition, go to Step 20

STEP 20. Scan tool (M.U.T.-III) CAN bus diagnostics (retest the system)

Diagnose CAN-C, and check if scan tool (M.U.T.-III) screen shows normal state.

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

STEP 21. Check the CAN-C between joint connector (CAN3) and the column switch. Resistance 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)

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 (CAN3) terminal No.6 (CAN_H) and body ground

OK: 1 kΩ or more

(4) Resistance between joint connector (CAN3) terminal No.17 (CAN_L) and body ground

OK: 1 kΩ or more

Is the check result normal?

<1 kΩ or more> Go to Step 24

<Less than 1 kΩ > Go to Step 22

STEP 22. Scan tool (M.U.T.-III) CAN bus diagnostics [column switch connector disconnected]

(1) Disconnect column switch 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.

caution

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

Does scan tool (M.U.T.-III) screen correspond to the illustration?

Repair the wiring harness between joint connector (CAN3) and the column switch connector.

Check the column switch connector, and repair if necessary. If the column switch connector is in good condition, go to Step 23

STEP 23. Scan tool (M.U.T.-III) CAN bus diagnostics (retest the system)

Diagnose CAN-C, and check if scan tool (M.U.T.-III) screen shows normal state.

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 column switch connector, and repair if necessary. If the column switch connector is in good condition, replace the column switch assembly (steering wheel sensor).

STEP 24. Check the CAN-C between joint connector (CAN3) and the occupant classification-ECU. Resistance 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)

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 (CAN3) terminal No.4 (CAN_H) and body ground

OK: 1 kΩ or more

(4) Resistance between joint connector (CAN3) terminal No.15 (CAN_L) and body ground

OK: 1 kΩ or more

Is the check result normal?

<1 kΩ or more> Go to Step 27

<Less than 1 kΩ > Go to Step 25

STEP 25. Scan tool (M.U.T.-III) CAN bus diagnostics [occupant classification-ECU connector disconnected]

(1) Disconnect occupant classification-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.

caution

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

Does scan tool (M.U.T.-III) screen correspond to the illustration?

Check the occupant classification-ECU connector, and repair if necessary. If the occupant classification-ECU connector is in good condition, go to Step 26

STEP 26. Scan tool (M.U.T.-III) CAN bus diagnostics (retest the system)

Diagnose CAN-C, and check if scan tool (M.U.T.-III) screen shows normal state.

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 occupant classification-ECU connector, and repair if necessary. If the occupant classification-ECU connector is in good condition, replace the occupant classification-ECU.

STEP 27. Check the CAN-C between joint connector (CAN3) and the FCM/LDW/AHB-ECU. Resistance 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)

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 (CAN3) terminal No.7 (CAN_H) and body ground

OK: 1 kΩ or more

(4) Resistance between joint connector (CAN3) terminal No.18 (CAN_L) and body ground

OK: 1 kΩ or more

Is the check result normal?

<1 kΩ or more> Go to Step 30

<Less than 1 kΩ > Go to Step 28

STEP 28. Scan tool (M.U.T.-III) CAN bus diagnostics [FCM/LDW/AHB-ECU connector disconnected]

(1) Disconnect FCM/LDW/AHB-ECU connector, and diagnose by using the scan tool (M.U.T.-III).

(2) Diagnose CAN bus lines, and check if scan tool (M.U.T.-III) screen is as shown in the illustration.

caution

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

Does scan tool (M.U.T.-III) screen correspond to the illustration?

Check the FCM/LDW/AHB-ECU connector, and repair if necessary. If the FCM/LDW/AHB-ECU connector is in good condition, go to Step 29

STEP 29. Scan tool (M.U.T.-III) CAN bus diagnostics (retest the system)

Diagnose CAN-C, and check if scan tool (M.U.T.-III) screen shows normal state.

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 FCM/LDW/AHB-ECU connector, and repair if necessary. If the FCM/LDW/AHB-ECU connector is in good condition, replace the FCM/LDW/AHB-ECU.

STEP 30. Check the CAN-C between joint connector (CAN3) and the SRS-ECU. Resistance 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)

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 (CAN3) terminal No.8 (CAN_H) and body ground

OK: 1 kΩ or more

(4) Resistance between joint connector (CAN3) terminal No.19 (CAN_L) and body ground

OK: 1 kΩ or more

Is the check result normal?

<1 kΩ or more> Go to Step 33

<Less than 1 kΩ > Go to Step 31

STEP 31. Scan tool (M.U.T.-III) CAN bus diagnostics [SRS-ECU connector disconnected]

(1) Disconnect SRS-ECU connector, and diagnose by using the scan tool (M.U.T.-III).

(2) Diagnose CAN bus lines, and check if scan tool (M.U.T.-III) screen is as shown in the illustration.

caution

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

Does scan tool (M.U.T.-III) screen correspond to the illustration?

Repair the wiring harness between joint connector (CAN3) 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 32

STEP 32. Scan tool (M.U.T.-III) CAN bus diagnostics (retest the system)

Diagnose CAN-C, and check if scan tool (M.U.T.-III) screen shows normal state.

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.

STEP 33. Check the CAN-C between joint connector (CAN3) and the electric parking brake ECU. Resistance 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)

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 (CAN3) terminal No.1 (CAN_H) and body ground

OK: 1 kΩ or more

(4) Resistance between joint connector (CAN3) terminal No.12 (CAN_L) and body ground

OK: 1 kΩ or more

Is the check result normal?

<1 kΩ or more> Go to Step 36

<Less than 1 kΩ > Go to Step 34

STEP 34. Scan tool (M.U.T.-III) CAN bus diagnostics [electric parking brake ECU connector disconnected]

(1) Disconnect electric parking brake ECU connector, and diagnose by using the scan tool (M.U.T.-III).

(2) Diagnose CAN bus lines, and check if scan tool (M.U.T.-III) screen is as shown in the illustration.

caution

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

Does scan tool (M.U.T.-III) screen correspond to the illustration?

Check the electric parking brake ECU connector, and repair if necessary. If the electric parking brake ECU connector is in good condition, go to Step 35

STEP 35. Scan tool (M.U.T.-III) CAN bus diagnostics (retest the system)

Diagnose CAN-C, and check if scan tool (M.U.T.-III) screen shows normal state.

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 parking brake ECU connector, and repair if necessary. If the electric parking brake ECU connector is in good condition, replace the electric parking brake ECU.

STEP 36. Check the CAN-C between joint connector (CAN3) and the gateway-ECU. Resistance 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)

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 (CAN3) terminal No.3 (CAN_H) and body ground

OK: 1 kΩ or more

(4) Resistance between joint connector (CAN3) terminal No.14 (CAN_L) and body ground

OK: 1 kΩ or more

Is the check result normal?

<1 kΩ or more> Go to Step 39

<Less than 1 kΩ > Go to Step 37

STEP 37. Scan tool (M.U.T.-III) CAN bus diagnostics [gateway-ECU connector disconnected]

(1) Disconnect gateway-ECU connector, and diagnose by using the scan tool (M.U.T.-III).

(2) Diagnose CAN bus lines, and check if scan tool (M.U.T.-III) screen is as shown in the illustration.

caution

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

Does scan tool (M.U.T.-III) screen correspond to the illustration?

Repair the wiring harness between joint connector (CAN3) and the gateway-ECU connector.

Check the electric parking brake ECU connector, and repair if necessary. If the gateway-ECU connector is in good condition, go to Step 38

STEP 38. Scan tool (M.U.T.-III) CAN bus diagnostics (retest the system)

Diagnose CAN-C, and check if scan tool (M.U.T.-III) screen shows normal state.

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

STEP 39. Check the CAN-C between joint connector (CAN3) and the data link connector. Resistance 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)

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 (CAN3) terminal No.9 (CAN_H) and body ground

OK: 1 kΩ or more

(4) Resistance between joint connector (CAN3) terminal No.20 (CAN_L) and body ground

OK: 1 kΩ or more

(5)

caution

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

Is the check result normal?

<1 kΩ or more> Repair the intermediate connector C-126, or the wiring harness between joint connector (CAN3) and the intermediate connector C-126.

<Less than 1 kΩ > 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]

(1) Disconnect ECM 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.

caution

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

Does scan tool (M.U.T.-III) screen correspond to the illustration?

Go to Step 42

Check the ECM connector, and repair if necessary. If the ECM connector is in good condition, go to Step 41

STEP 41. Scan tool (M.U.T.-III) CAN bus diagnostics (retest the system)

Diagnose CAN-C, and check if scan tool (M.U.T.-III) screen shows normal state.

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 ECM connector, and repair if necessary. If the ECM connector is in good condition, replace the ECM.

STEP 42. Scan tool (M.U.T.-III) CAN bus diagnostics [ETACS-ECU connector disconnected]

(1) Disconnect ETACS-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.

caution

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

Does scan tool (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 43

STEP 43. Scan tool (M.U.T.-III) CAN bus diagnostics (retest the system)

Diagnose CAN-C, and check if scan tool (M.U.T.-III) screen shows normal state.

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.