ENTRY AND START SYSTEM(for Start Function), Diagnostic DTC:U0100,U0140,U0142,U0155 and U1103

DTC Code DTC Name
U0100 Lost Communication with ECM / PCM
U0140 Lost Communication with Main Body ECU
U0142 Lost Communication with Main Body ECU
U0155 Lost Communication with Combination Meter
U1103 Lost Communication with Stop and Start Control Module

DESCRIPTION

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

Tip:

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

DTC Output from

U0100

Lost Communication with ECM / PCM

CAN communication error between the certification ECU (smart key ECU assembly) and ECM (1-trip detection*)

ECM

Turn the engine switch on (IG) and wait 10 seconds or more.

U0140

Lost Communication with Main Body ECU

CAN communication error between the certification ECU (smart key ECU assembly) and main body ECU (1-trip detection*)

Main body ECU (multiplex network body ECU)

Always

U0142

Lost Communication with Main Body ECU

CAN communication error between the certification ECU (smart key ECU assembly) and main body ECU (1-trip detection*)

Main body ECU (multiplex network body ECU)

Always

U0155

Lost Communication with Combination Meter

CAN communication error between the certification ECU (smart key ECU assembly) and combination meter assembly (1-trip detection*)

Combination meter assembly

Turn the engine switch on (IG) and wait 10 seconds or more.

U1103

Lost Communication with Stop and Start Control Module

CAN communication malfunction between the certification ECU (smart key ECU assembly) and engine stop and start ECU (1-trip detection logic*).

Engine stop and start ECU

Turn the engine switch on (IG) and wait 10 seconds or more.

*: Only detected while a malfunction is present and the engine switch is on (IG)

Table 1. 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 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.

U0140

U0142

Doors cannot be locked or unlocked. The warning (wireless buzzer) does not sound.

-

U0155

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

-

U1103

  • The engine stall misjudgment is done by the idling stop by stop and start system.

  • Immobiliser set is done by the door operation in the idling stop by stop and start system

-
Tip:

Related Data List and Active Test Items

DTC

Data List Item

Active Test Item

U0100

U0140

U0142

U0155

U1103

-

-

CAUTION / NOTICE / HINT

Note:

  • When using the GTS with the engine switch off to troubleshoot:

    Connect the GTS to the DLC3 and turn a courtesy light switch on and off at 1.5 second intervals until communication between the GTS and vehicle begins.

  • 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 (for LHD)

      NEXT (for RHD)
    NEXT (for LHD)

    GO TO CAN COMMUNICATION SYSTEM (HOW TO PROCEED WITH TROUBLESHOOTING)

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    NEXT (for RHD)

    GO TO CAN COMMUNICATION SYSTEM (HOW TO PROCEED WITH TROUBLESHOOTING)

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