DESCRIPTION These DTCs are
stored when there is a CAN communication malfunction between the
certification ECU (smart key ECU assembly), ECM, main body ECU
(multiplex network body ECU) or combination meter assembly, and data
from the option connector (bus buffer ECU) cannot be received. |
DTC No. | Detection Item |
DTC Detection Condition | Trouble Area |
Note | | U0100 |
Lost Communication with ECM / PCM |
CAN communication malfunction between certification ECU (smart key ECU assembly) and ECM (1-trip detection logic*) |
ECM |
- Turn the engine switch on (IG) and wait at least 10 seconds.
| | U0140 |
Lost Communication with Main Body ECU |
CAN
communication malfunction between certification ECU (smart key ECU
assembly) and main body ECU (multiplex network body ECU) (1-trip
detection logic*) | Main body ECU (multiplex network body ECU) |
| | U0142 |
Lost Communication with Main Body ECU |
CAN
communication malfunction between certification ECU (smart key ECU
assembly) and main body ECU (multiplex network body ECU) (1-trip
detection logic*) | Main body ECU (multiplex network body ECU) |
| | U0155 |
Lost Communication with Combination Meter |
CAN
communication malfunction between certification ECU (smart key ECU
assembly) and combination meter assembly (1-trip detection logic*) |
Combination meter assembly |
- Turn the engine switch on (IG) and wait at least 10 seconds.
|
- *: Only detected while a malfunction is present.
Vehicle Condition and Fail-safe Function when Malfunction Detected |
DTC Code | Vehicle Condition when Malfunction Detected |
Fail-safe Function when Malfunction Detected | |
U0100 | There is no effect on vehicle behavior. |
If
the following conditions are met, it can be determined that the
malfunction is not in the direct line (NE) but in the CAN communication
system.
- When the engine switch is pressed, the system controls the engine based
on the engine speed signal via direct line, causing the engine to stop
cranking.
- When the engine switch is pressed and held, the system controls the
engine based on the engine speed signal via direct line, causing the
engine to stop cranking.
If the following conditions are met,
it can be determined that there is a malfunction in both the CAN
communication system and the direct line (NE).
- When the engine switch is pressed, the engine stops cranking after 6 seconds.
- When the engine switch is pressed and held, the engine remains cranking for up to 30 seconds.
| | U0140
U0142 |
- Doors cannot be locked or unlocked.
- The warning (wireless buzzer) does not sound.
| - | |
U0155 | The warning (meter buzzer) does not sound and no warning messages displayed on the multi-information display. |
- | Related Data List and Active Test Items |
DTC No. | Data List and Active Test | |
U0100 U0140 U0142 U0155 |
- | CAUTION / NOTICE / HINT
NOTICE:
- When using the Techstream with the engine switch off, connect the
Techstream to the DLC3 and turn a courtesy light switch on and off at
intervals of 1.5 seconds or less until communication between the
Techstream and the vehicle begins. Then select the vehicle type under
manual mode and enter the following menus: Body Electrical / Smart Key.
While using the Techstream, periodically turn a courtesy light switch on
and off at intervals of 1.5 seconds or less to maintain communication
between the Techstream and the vehicle.
- After repair, confirm that no DTCs are output by performing "DTC Output Confirmation Operation".
HINT: When the
cable is disconnected and reconnected to the negative (-) battery
terminal, the power source mode returns to the state it was in before
the cable was disconnected. PROCEDURE
(a) Check for DTCs and note any DTCs that are output.
Click here 
| NEXT |
 | GO TO CAN COMMUNICATION SYSTEM (HOW TO PROCEED WITH TROUBLESHOOTING) | |
