Toyota Corolla Cross Owners & Service Manuals

Toyota Corolla Cross: Lost Communication With ECM/PCM "A" Missing Message (U010087,U012987,U014087,U015587,U029387,U111787)

Toyota Corolla Cross (2022-2024) Service Manual / Vehicle Interior / Theft Deterrent / Keyless Entry / Smart Key System (for Entry Function, Hev Model) / Lost Communication With ECM/PCM "A" Missing Message (U010087,U012987,U014087,U015587,U029387,U111787)

DESCRIPTION

These DTCs are stored when there is a CAN communication malfunction between the certification ECU (smart key ECU assembly and ECM, skid control ECU (brake actuator assembly), main body ECU (multiplex network body ECU), hybrid vehicle control ECU, combination meter assembly or option connector (bus buffer ECU).

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

Note

U010087

Lost Communication With ECM/PCM "A" Missing Message

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

ECM

 DTC Output Confirmation Operation:
  • Turn the ignition switch ON and wait at least 10 seconds.

U012987

Lost Communication with Brake System Control Module "A" Missing Message

CAN communication malfunction between certification ECU (smart key ECU assembly) and skid control ECU (brake actuator assembly) (1-trip detection logic*1)

Skid control ECU (brake actuator assembly)

 DTC Output Confirmation Operation:
  • Turn the ignition switch ON and wait at least 10 seconds.

U014087

Lost Communication with Body Control Module Missing Message

CAN communication malfunction between certification ECU (smart key ECU assembly) and main body ECU (multiplex network body ECU) (1-trip detection logic*1)

Main body ECU (multiplex network body ECU)

 DTC Output Confirmation Operation:
  • Turn the ignition switch ON and wait at least 10 seconds.

U015587

Lost Communication with Instrument Panel Cluster (IPC) Control Module Missing Message

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

Combination meter assembly

 DTC Output Confirmation Operation:
  • Turn the ignition switch ON and wait at least 10 seconds.

U029387

Lost Communication with Hybrid/EV Powertrain Control Module Missing Message

CAN communication malfunction between certification ECU (smart key ECU assembly) and hybrid vehicle control ECU (1-trip detection logic*1)

Hybrid vehicle control ECU

 DTC Output Confirmation Operation:
  • Turn the ignition switch ON and wait at least 10 seconds.

U111787

Lost Communication with Accessory Gateway Missing Message

CAN communication malfunction between the certification ECU (smart key ECU assembly) and the option connector (bus buffer ECU) for approximately 10 seconds or more.

Option connector (bus buffer ECU)

 DTC Output Confirmation Operation:
  • Turn the ignition switch ON and wait at least 10 seconds.
  • *1: 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

U010087

There is no effect on vehicle behavior.

-

U012987

-

-

U014087
  • Doors cannot be locked or unlocked.
  • The warning (wireless buzzer) does not sound.

-

U015587

The warning (meter buzzer) does not sound and no warning messages displayed on the multi-information display.

-

U029387

There is no effect on vehicle behavior.

-

U111787

The engine cannot be started using the wireless remote control function.

-
Related Data List and Active Test Items

DTC No.

Data List and Active Test

U010087

U012987

U014087

U015587

U029387

U111787

-

CAUTION / NOTICE / HINT

NOTICE:

  • When using the GTS with the ignition 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 vehicle type under manual mode and enter the following menus: Body Electrical / Smart Key. 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 repair, confirm that no DTCs are output by performing "DTC Output Confirmation Operation".

PROCEDURE

1.

CHECK FOR DTC

(a) Check for DTCs and note any DTCs that are output.

NEXT

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

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