SMART ENTRY AND START SYSTEM(for Start Function), Diagnostic DTC:U0100, U0155

DTC Code DTC Name
U0100 Lost Communication with ECM / PCM
U0155 Lost Communication with Combination Meter

DESCRIPTION

These DTCs are stored when there is a CAN communication error between the certification ECU (smart key ECU assembly), ECM or combination meter assembly.

Tech Tips

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.

DTC No. Detection Item DTC Detection Condition Trouble Area Note
U0100 Lost Communication with ECM / PCM CAN communication error between the certification ECU (smart key ECU assembly) and ECM (1-trip detection logic*) ECM Turn the engine switch on (IG) and wait 10 seconds or more.
U0155 Lost Communication with Combination Meter CAN communication error between the 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 10 seconds or more.

Vehicle Condition and Fail-safe Function when Malfunction Detected
DTC No. 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 is determined that the malfunction is not in the direct line (NE) but in CAN communication.


  • 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 is determined that there is a malfunction in both CAN communication 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.

U0155 The warning (meter buzzer) does not sound and the meter does not indicate a warning. -

Tech Tips

Related Data List and Active Test Items
DTC Data List Item Active Test Item

U0100

U0155

- -

CAUTION / NOTICE / HINT

Note


  • When using the GTS with the engine switch off, connect the GTS to the DLC3 and turn a courtesy light switch on and off at intervals of 1.5 seconds or less until communication between the GTS and the vehicle begins. Then select the Model Code "KEY REGIST" under manual mode and enter the following menus: Body Electrical / Entry&Start(CAN). While using the GTS, periodically turn a courtesy light switch on and off at intervals of 1.5 seconds or less to maintain communication between the GTS and the vehicle.

  • After performing repairs, perform the operation that fulfills the DTC output confirmation operation, and then confirm that no DTCs are output again.

PROCEDURE


  1. CHECK FOR DTC


    1. Note any DTCs that are output.

      Click here

      Result
      Proceed to
      NEXT

    NEXT