Disconnect the cable from the negative (-) battery terminal before measuring the resistances of the main wire and the branch wire.
DTCs for the CAN communication system are as follows: U0073, U0100, U0101, U0104, U0114/38, U0122, U0123, U0124, U0125, U0126, U0129, U0130, U0131, U0132, U0140, U0141, U0142, U0151, U0155, U0164, U0199, U0208, U0230, U0327, U1002 (CAN MS BUS), U1002 (CAN No. 2 BUS), U1100, U1101, U110B, U1110, U1111, U1115, U1117, B1499, B2427, B2621, B2624, B2779 and C1AEF.
Refer to the troubleshooting procedures of each system if DTCs regarding the CAN communication system are not output.
Before measuring the resistance, leave the vehicle for at least 1 minute and do not operate the ignition switch, any switches or doors. If doors need to be opened in order to check connectors, open the doors and leave them open.
After turning the ignition switch off, waiting time may be required before disconnecting the cable from the battery terminal. Therefore, make sure to read the disconnecting the cable from the battery terminal notice before proceeding with work ().
When disconnecting the cable, some systems need to be initialized after the cable is reconnected ().
Connect the cable to the negative (-) battery terminal.
- When disconnecting the cable, some systems need to be initialized after the cable is reconnected ().
Select "Bus Check" from "System Select" ().
Wait 1 minute and then check the display of the connected ECUs and sensors.
ResultInspection Result | Proceed to |
All ECUs and sensors connected to the CAN communication system are displayed on the screen. | A |
Except for the main body ECU (cowl side junction block LH), no ECUs connected to the MS bus are displayed. The main body ECU (cowl side junction block LH) outputs the MS bus trouble code (U1002) (the MS bus main wire open or short malfunction). | B |
No ECUs connected to the MS bus are displayed (the branch wire between the main body ECU (cowl side junction block LH) and V bus circuit is open). | C |
Except for the network gateway ECU, no ECUs connected to the movement control bus are displayed. The network gateway ECU outputs the movement control bus trouble code (U1002) (the movement control bus main wire open or short malfunction). | D |
No ECUs connected to the movement control bus are displayed (the branch wire between the network gateway ECU and movement control bus is open). | E |
An ECU or sensor that should be connected to the CAN communication system is not displayed (the ECU or sensor branch wire is open). | F |
An ECU or sensor that should be connected to the CAN communication system is not displayed or display is intermittent during check (the ECU or sensor branch wire is open on one side). | G |
- ECUs and sensors that are not present will not be displayed. Be careful not to mistake them for communication stop malfunctions.
If the display of an ECU is intermittent during the check, one side of an ECU or sensor branch wire is open (The signal of the ECU is treated as noise, which affects the response and display of the intelligent tester).
The main body ECU (cowl side junction block LH) checks for proper ECU communication for ECUs that are connected to the CAN MS bus circuit, and the results are displayed on the intelligent tester.
The gateway ECU built into the main body ECU (cowl side junction block LH) may be malfunctioning if both of the following occurs: 1) all ECUs connected to the MS bus are not displayed on the tester; and 2) DTC U1002 is not output.
If communication stops between an ECU and the main body ECU (cowl side junction block LH) or network gateway ECU for 10 seconds or more, the ECU disappears from the intelligent tester display.
For communication stop mode of ECUs connected to the CAN MS bus circuit or movement control bus, refer to the DTC flowchart of the respective communication stop.