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Diagnostic Item 2: Diagnose shorts in the power supply to CAN-C.
 
 
cautionWhen 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.
 
 
TROUBLE JUDGMENT CONDITIONS
The scan tool (M.U.T.-IIISE) 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 volts.
 
 
TROUBLESHOOTING HINTS
  • Malfunction of the wiring harness
  • Malfunction of the connector
  • Malfunction of the ETACS-ECU
  • Malfunction of the steering column switch (steering wheel sensor)
  • Malfunction of the SRS-ECU
  • Malfunction of the occupant classification-ECU
  • Malfunction of the gateway-ECU (for BSW) <Vehicles with Blind Spot Warning [BSW] (with Lane Change Assist) system>
  • Malfunction of the electric parking brake ECU <Vehicles with electric parking brake>
  • Malfunction of the FCM/LDW/AHB-ECU
  • Malfunction of the AWC-ECU <AWD>
  • Malfunction of the TCM
  • Malfunction of the ASC-ECU
  • Malfunction of the EPS-ECU
  • Malfunction of the ACC/FCM-ECU <Vehicles with ACC>
  • Malfunction of the ECM
 
 
DIAGNOSIS
Required Special Tools:
  • MB991223: Harness Set
  • MB992006: Extra Fine Probe
STEP 1. Check the CAN-C. Voltage measurement at data link connector.
cautionA digital multimeter should be used. For details refer to .
cautionThe test wiring harness should be used. For details refer to .
noteThis 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 ground
OK: 4.0 volts or less
(4) Voltage between data link connector terminal No.14 (CAN_L) and body ground
OK: 4.0 volts or less
(5) Disconnect the negative battery terminal.
Is the check result normal?
<Both of the measurement results show 4.0 volts or less> Go to Step 39.
<Either of CAN_H line or CAN_L line the measurement results show more than 4.0 volts> Go to Step 2.
 
STEP 2. Check the CAN-C. Voltage measurement at C-149 intermediate connector.
cautionA digital multimeter should be used. For details refer to .
cautionThe 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-149 intermediate connector terminal No.19 (CAN_H) and body ground
OK: 4.0 volts or less
(4) Voltage between C-149 intermediate connector terminal No.18 (CAN_L) and body ground
OK: 4.0 volts or less
(5) Disconnect the negative battery terminal.
Is the check result normal?
<4.0 volts or less> Go to Step 16.
<More than 4.0 volts> Go to Step 3.
 
STEP 3. Check the CAN-C between joint connector (CAN3) and the engine control module. Voltage measurement at joint connector (CAN3).
cautionA digital multimeter should be used. For details refer to .
cautionThe 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.10 (CAN_H) and body ground
OK: 4.0 volts or less
(4) Voltage between joint connector (CAN3) terminal No.21 (CAN_L) and body ground
OK: 4.0 volts or less
cautionStrictly observe the specified wiring harness repair procedure. For details refer to .
(5) Disconnect the negative battery terminal.
Is the check result normal?
<4.0 volts or less> Go to Step 7.
: <More than 4.0 volts> Repair the wiring harness between joint connector (CAN3) and the ECM connector.
: Go to Step 4.
 
STEP 4. Check the CAN-C between joint connector (CAN4) and the ACC/FCM-ECU. Voltage measurement at joint connector (CAN4).
cautionA digital multimeter should be used. For details refer to .
cautionThe test wiring harness should be used. For details refer to .
(1) Disconnect joint connector (CAN4), 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 (CAN4) terminal No.9 (CAN_H) and body ground
OK: 4.0 volts or less
(4) Voltage between joint connector (CAN4) terminal No.20 (CAN_L) and body ground
OK: 4.0 volts or less
(5) Disconnect the negative battery terminal.
cautionStrictly observe the specified wiring harness repair procedure. For details refer to .
Is the check result normal?
<4.0 volts or less> Repair the wiring harness between joint connector (CAN3) and the ECM connector.
<More than 4.0 volts> Go to Step 5.
 
STEP 5. Scan tool (M.U.T.-IIISE) CAN bus diagnostics [ACC/FCM-ECU connector disconnected]
(1) Disconnect ACC/FCM-ECU connector and read all diagnosis with the scan tool (M.U.T.-IIISE).
(2) Confirm that all diagnosis reading results are as shown in the table.
cautionStrictly observe the specified wiring harness repair procedure. For details refer to .
Are all diagnosis reading results as shown in the table?
Repair the wiring harness between joint connector (CAN4) and the ACC/FCM-ECU connector.
Check the ACC/FCM-ECU connector, and repair if necessary. If the ACC/FCM-ECU connector is in good condition, go to Step 6.
 
STEP 6. Scan tool (M.U.T.-IIISE) CAN bus diagnostics (retest the system)
Diagnose CAN-C, and check if the scan tool (M.U.T.-IIISE) 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/FCM-ECU connector, and repair if necessary. If the ACC/FCM-ECU connector is in good condition, replace the ACC/FCM-ECU.
 
STEP 7. Check the CAN-C between joint connector (CAN3) and the TCM. Voltage measurement at joint connector (CAN3).
cautionA digital multimeter should be used. For details refer to .
cautionThe 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 ground
OK: 4.0 volts or less
(4) Voltage between joint connector (CAN3) terminal No.16 (CAN_L) and body ground
OK: 4.0 volts or less
(5) Disconnect the negative battery terminal.
Is the check result normal?
<4.0 volts or less> Go to Step 10.
<More than 4.0 volts> Go to Step 8.
 
STEP 8. Scan tool (M.U.T.-IIISE) CAN bus diagnostics [TCM connector disconnected]
(1) Disconnect TCM connector and read all diagnosis with the scan tool (M.U.T.-IIISE).
(2) Confirm that all diagnosis reading results are as shown in the table.
cautionStrictly observe the specified wiring harness repair procedure. For details refer to .
Are all diagnosis reading results as shown in the table?
Repair the wiring harness between joint connector (CAN3) and the TCM.
Check the TCM connector, and repair if necessary. If the TCM connector is in good condition, go to Step 9.
 
STEP 9. Scan tool (M.U.T.-IIISE) CAN bus diagnostics (retest the system)
Diagnose CAN-C, and check if the scan tool (M.U.T.-IIISE) 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 10. Check the CAN-C between joint connector (CAN3) and the ASC-ECU. Voltage measurement at joint connector (CAN3).
cautionA digital multimeter should be used. For details refer to .
cautionThe 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 ground
OK: 4.0 volts or less
(4) Voltage between joint connector (CAN3) terminal No.19 (CAN_L) and body ground
OK: 4.0 volts or less
(5) Disconnect the negative battery terminal.
Is the check result normal?
<4.0 volts or less> Go to Step 13.
<More than 4.0 volts> Go to Step 11.
 
STEP 11. Scan tool (M.U.T.-IIISE) CAN bus diagnostics [ASC-ECU connector disconnected]
(1) Disconnect ASC-ECU connector and read all diagnosis with the scan tool (M.U.T.-IIISE).
(2) Confirm that all diagnosis reading results are as shown in the table.
cautionStrictly observe the specified wiring harness repair procedure. For details refer to .
Are all diagnosis reading results as shown in the table?
Repair the wiring harness between joint connector (CAN3) 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 12.
 
STEP 12. Scan tool (M.U.T.-IIISE) CAN bus diagnostics (retest the system)
Diagnose CAN-C, and check if the scan tool (M.U.T.-IIISE) 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 13. Check the CAN-C between joint connector (CAN3) and the EPS-ECU. Voltage measurement at joint connector (CAN3).
cautionA digital multimeter should be used. For details refer to .
cautionThe 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 ground
OK: 4.0 volts or less
(4) Voltage between joint connector (CAN3) terminal No.20 (CAN_L) and body ground
OK: 4.0 volts or less
(5) Disconnect the negative battery terminal.
Is the check result normal?
<4.0 volts or less> Repair intermediate connector C-149, or the wiring harness between joint connector (CAN3) and the intermediate connector C-149.
<More than 4.0 volts> Go to Step 14.
 
STEP 14. Scan tool (M.U.T.-IIISE) CAN bus diagnostics [EPS-ECU connector disconnected]
(1) Disconnect EPS-ECU connector and read all diagnosis with the scan tool (M.U.T.-IIISE).
(2) Confirm that all diagnosis reading results are as shown in the table.
cautionStrictly observe the specified wiring harness repair procedure. For details refer to .
Are all diagnosis reading results as shown in the table?
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 EPS-ECU connector.
Check the EPS-ECU connector, and repair if necessary. If the EPS-ECU connector is in good condition, go to Step 15.
 
STEP 15. Scan tool (M.U.T.-IIISE) CAN bus diagnostics (retest the system)
Diagnose CAN-C, and check if the scan tool (M.U.T.-IIISE) 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 16. Check the CAN-C between joint connector (CAN1) and the ETACS-ECU. Voltage measurement at joint connector (CAN1).
cautionA digital multimeter should be used. For details refer to .
cautionThe 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 ground
OK: 4.0 volts or less
(4) Voltage between joint connector (CAN1) terminal No.19 (CAN_L) and body ground
OK: 4.0 volts or less
(5) Disconnect the negative battery terminal.
cautionStrictly observe the specified wiring harness repair procedure. For details refer to .
Is the check result normal?
: <4.0 volts or less> Go to Step 17.
: <4.0 volts or less> Go to Step 20.
: <More than 4.0 volts> Repair the wiring harness between joint connector (CAN1) and the ETACS-ECU connector.
 
STEP 17. Check the CAN-C between joint connector (CAN1) and the AWC-ECU. Voltage measurement at joint connector (CAN1).
cautionA digital multimeter should be used. For details refer to .
cautionThe 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.11 (CAN_H) and body ground
OK: 4.0 volts or less
(4) Voltage between joint connector (CAN1) terminal No.22 (CAN_L) and body ground
OK: 4.0 volts or less
(5) Disconnect the negative battery terminal.
Is the check result normal?
<4.0 volts or less> Go to Step 20.
<More than 4.0 volts> Go to Step 18.
 
STEP 18. Scan tool (M.U.T.-IIISE) CAN bus diagnostics [AWC-ECU connector disconnected]
(1) Disconnect AWC-ECU connector and read all diagnosis with the scan tool (M.U.T.-IIISE).
(2) Confirm that all diagnosis reading results are as shown in the table.
cautionStrictly observe the specified wiring harness repair procedure. For details refer to .
Are all diagnosis reading results as shown in the table?
Check the intermediate connector or joint connector (CAN2), and repair if necessary. If the connector is in good condition, repair the wiring harness between joint connector (CAN1) and the AWC-ECU connector.
Check the AWC-ECU connector, and repair if necessary. If the AWC-ECU connector is in good condition, go to Step 19.
 
STEP 19. Scan tool (M.U.T.-IIISE) CAN bus diagnostics (retest the system)
Diagnose CAN-C, and check if the scan tool (M.U.T.-IIISE) 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 AWC-ECU connector, and repair if necessary. If the AWC-ECU connector is in good condition, replace the AWC-ECU.
 
STEP 20. Check the CAN-C between joint connector (CAN1) and the FCM/LDW/AHB-ECU. Voltage measurement at joint connector (CAN1).
cautionA digital multimeter should be used. For details refer to .
cautionThe 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.11 (CAN_H) and body ground
OK: 4.0 volts or less
(4) Voltage between joint connector (CAN1) terminal No.22 (CAN_L) and body ground
OK: 4.0 volts or less
(5) Disconnect the negative battery terminal.
Is the check result normal?
<4.0 volts or less> Go to Step 23.
: <More than 4.0 volts> Go to Step 21.
 
STEP 21. Scan tool (M.U.T.-IIISE) CAN bus diagnostics [FCM/LDW/AHB-ECU connector disconnected]
(1) Disconnect FCM/LDW/AHB-ECU connector and read all diagnosis with the scan tool (M.U.T.-IIISE).
(2) Confirm that all diagnosis reading results are as shown in the table.
cautionStrictly observe the specified wiring harness repair procedure. For details refer to .
Are all diagnosis reading results as shown in the table?
Check the intermediate connector or joint connector (CAN2), and repair if necessary. If the connector is in good condition, repair the wiring harness between joint connector (CAN1) and the FCM/LDW/AHB-ECU connector.
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 22.
 
STEP 22. Scan tool (M.U.T.-IIISE) CAN bus diagnostics (retest the system)
Diagnose CAN-C, and check if the scan tool (M.U.T.-IIISE) 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 23. Check the CAN-C between joint connector (CAN1) and the electric parking brake ECU. Voltage measurement at joint connector (CAN1).
cautionA digital multimeter should be used. For details refer to .
cautionThe 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 volts or less
(4) Voltage between joint connector (CAN1) terminal No.15 (CAN_L) and body ground
OK: 4.0 volts or less
(5) Disconnect the negative battery terminal.
Is the check result normal?
<4.0 volts or less> Go to Step 26.
<More than 4.0 volts> Go to Step 24.
 
STEP 24. Scan tool (M.U.T.-IIISE) CAN bus diagnostics [electric parking brake ECU connector disconnected]
(1) Disconnect electric parking brake ECU connector and read all diagnosis with the scan tool (M.U.T.-IIISE).
(2) Confirm that all diagnosis reading results are as shown in the table.
cautionStrictly observe the specified wiring harness repair procedure. For details refer to .
Are all diagnosis reading results as shown in the table?
Repair the wiring harness between joint connector (CAN1) and the electric parking brake ECU connector.
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 25.
 
STEP 25. Scan tool (M.U.T.-IIISE) CAN bus diagnostics (retest the system)
Diagnose CAN-C, and check if the scan tool (M.U.T.-IIISE) 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 26. Check the CAN-C between joint connector (CAN1) and the column switch. Voltage measurement at joint connector (CAN1).
cautionA digital multimeter should be used. For details refer to .
cautionThe 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.10 (CAN_H) and body ground
OK: 4.0 volts or less
(4) Voltage between joint connector (CAN1) terminal No.21 (CAN_L) and body ground
OK: 4.0 volts or less
(5) Disconnect the negative battery terminal.
Is the check result normal?
<4.0 volts or less> Go to Step 29.
<More than 4.0 volts> Go to Step 27.
 
STEP 27. Scan tool (M.U.T.-IIISE) CAN bus diagnostics [column switch connector disconnected]
(1) Disconnect column switch connector and read all diagnosis with the scan tool (M.U.T.-IIISE).
(2) Confirm that all diagnosis reading results are as shown in the table.
cautionStrictly observe the specified wiring harness repair procedure. For details refer to .
Are all diagnosis reading results as shown in the table?
Repair the wiring harness between joint connector (CAN1) 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 28.
 
STEP 28. Scan tool (M.U.T.-IIISE) CAN bus diagnostics (retest the system)
Diagnose CAN-C, and check if the scan tool (M.U.T.-IIISE) 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 steering column switch.
 
STEP 29. Check the CAN-C between joint connector (CAN1) and the occupant classification-ECU. Voltage measurement at joint connector (CAN1).
cautionA digital multimeter should be used. For details refer to .
cautionThe 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.3 (CAN_H) and body ground
OK: 4.0 volts or less
(4) Voltage between joint connector (CAN1) terminal No.14 (CAN_L) and body ground
OK: 4.0 volts or less
(5) Disconnect the negative battery terminal.
Is the check result normal?
<4.0 volts or less> Go to Step 32.
<More than 4.0 volts> Go to Step 30.
 
STEP 30. Scan tool (M.U.T.-IIISE) CAN bus diagnostics [occupant classification-ECU connector disconnected]
(1) Disconnect occupant classification-ECU connector and read all diagnosis with the scan tool (M.U.T.-IIISE).
(2) Confirm that all diagnosis reading results are as shown in the table.
cautionStrictly observe the specified wiring harness repair procedure. For details refer to .
Are all diagnosis reading results as shown in the table?
Check the front seat assembly (passenger's side) connector, and repair if necessary. If the front seat assembly (passenger's side) connector is in good condition, repair the wiring harness between joint connector (CAN1) and the occupant classification-ECU connector.
Check the occupant classification-ECU connector, and repair if necessary. If the occupant classification-ECU connector is in good condition, go to Step 31.
 
STEP 31. Scan tool (M.U.T.-IIISE) CAN bus diagnostics (retest the system)
Diagnose CAN-C, and check if the scan tool (M.U.T.-IIISE) 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 32. Check the CAN-C between joint connector (CAN1) and the SRS-ECU. Voltage measurement at joint connector (CAN1).
cautionA digital multimeter should be used. For details refer to .
cautionThe 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.9 (CAN_H) and body ground
OK: 4.0 volts or less
(4) Voltage between joint connector (CAN1) terminal No.20 (CAN_L) and body ground
OK: 4.0 volts or less
(5) Disconnect the negative battery terminal.
Is the check result normal?
: <4.0 volts or less> Go to Step 35.
: <4.0 volts or less> Go to Step 38.
<More than 4.0 volts> Go to Step 33.
 
STEP 33. Scan tool (M.U.T.-IIISE) CAN bus diagnostics [SRS-ECU connector disconnected]
(1) Disconnect SRS-ECU connector and read all diagnosis with the scan tool (M.U.T.-IIISE).
(2) Confirm that all diagnosis reading results are as shown in the table.
cautionStrictly observe the specified wiring harness repair procedure. For details refer to .
Are all diagnosis reading results as shown in the table?
Repair the wiring harness between joint connector (CAN1) 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 34.
 
STEP 34. Scan tool (M.U.T.-IIISE) CAN bus diagnostics (retest the system)
Diagnose CAN-C, and check if the scan tool (M.U.T.-IIISE) 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 35. Check the CAN-C between joint connector (CAN1) and the gateway-ECU (for BSW). Voltage measurement at joint connector (CAN1).
cautionA digital multimeter should be used. For details refer to .
cautionThe 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.5 (CAN_H) and body ground
OK: 4.0 volts or less
(4) Voltage between joint connector (CAN1) terminal No.16 (CAN_L) and body ground
OK: 4.0 volts or less
(5) Disconnect the negative battery terminal.
Is the check result normal?
<4.0 volts or less> Go to Step 38.
<More than 4.0 volts> Go to Step 36.
 
STEP 36. Scan tool (M.U.T.-IIISE) CAN bus diagnostics [gateway-ECU (for BSW) connector disconnected]
(1) Disconnect gateway-ECU (for BSW) connector and read all diagnosis with the scan tool (M.U.T.-IIISE).
(2) Confirm that all diagnosis reading results are as shown in the table.
cautionStrictly observe the specified wiring harness repair procedure. For details refer to .
Are all diagnosis reading results as shown in the table?
Repair the wiring harness between joint connector (CAN1) and the gateway-ECU (for BSW) connector.
Check the gateway-ECU (for BSW) connector, and repair if necessary. If the gateway-ECU (for BSW) connector is in good condition, go to Step 37.
 
STEP 37. Scan tool (M.U.T.-IIISE) CAN bus diagnostics (retest the system)
Diagnose CAN-C, and check if the scan tool (M.U.T.-IIISE) 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 (for BSW) connector, and repair if necessary. If the gateway-ECU (for BSW) connector is in good condition, replace the gateway-ECU (for BSW).
 
STEP 38. Check the CAN-C between joint connector (CAN1) and the data link connector. Voltage measurement at joint connector (CAN1).
cautionA digital multimeter should be used. For details refer to .
cautionThe 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 ground
OK: Less than 1.0 volt
(4) Voltage between joint connector (CAN1) terminal No.18 (CAN_L) and body ground
OK: Less than 1.0 volt
(5) Disconnect the negative battery terminal.
cautionStrictly observe the specified wiring harness repair procedure. For details refer to .
Is the check result normal?
<Less than 1.0 volt> Repair the intermediate connector C-149, or the wiring harness between joint connector (CAN1) and the intermediate connector C-149.
<1.0 volt or more> Repair the data link connector, or the wiring harness between joint connector (CAN1) and the data link connector.
 
STEP 39. Scan tool (M.U.T.-IIISE) CAN bus diagnostics [ECM connector disconnected]
(1) Disconnect ECM connector and read all diagnosis with the scan tool (M.U.T.-IIISE).
(2) Confirm that all diagnosis reading results are as shown in the table.
cautionStrictly observe the specified wiring harness repair procedure. For details refer to .
Are all diagnosis reading results as shown in the table?
Go to Step 41.
Check the ECM connector, and repair if necessary. If the engine control module connector is in good condition, go to Step 40.
 
STEP 40. Scan tool (M.U.T.-IIISE) CAN bus diagnostics (retest the system)
Diagnose CAN-C, and check if the scan tool (M.U.T.-IIISE) 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 engine control module connector is in good condition, replace the ECM.
 
STEP 41. Scan tool (M.U.T.-IIISE) CAN bus diagnostics [ETACS-ECU connector disconnected]
(1) Disconnect ETACS-ECU connector and read all diagnosis with the scan tool (M.U.T.-IIISE).
(2) Confirm that all diagnosis reading results are as shown in the table.
cautionStrictly observe the specified wiring harness repair procedure. For details refer to .
Are all diagnosis reading results as shown in the table?
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 42.
 
STEP 42. Scan tool (M.U.T.-IIISE) CAN bus diagnostics (retest the system)
Diagnose CAN-C, and check if the scan tool (M.U.T.-IIISE) 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.