Toyota Corolla Cross Owners & Service Manuals

Toyota Corolla Cross: Lost Communication With Brake System Control Module Missing Message (U012987)

Toyota Corolla Cross (2022-2024) Service Manual / Drivetrain / K120 (cvt) / Continuously Variable Transaxle System / Lost Communication With Brake System Control Module Missing Message (U012987)

DESCRIPTION

The TCM receives signals from the skid control ECU via CAN communication. When DTCs indicating a CAN communication system malfunction are output, repair the CAN communication system before performing troubleshooting for each corresponding ECU or sensor.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

MIL

Memory

Note

U012987

Lost Communication With Brake System Control Module Missing Message

No communication between the TCM and skid control ECU (brake actuator assembly) for 2.2 seconds or more (1-trip logic)

  • CAN communication system
  • Skid control ECU (Brake actuator assembly)
  • TCM
  • Except Mexico Models: Does not come on
  • For Mexico Models: Comes on

DTC stored

  • SAE Code: U0129
  • DTC for Mexico Models: Applies (Mexico models only)

CONFIRMATION DRIVING PATTERN

HINT:

After repairs have been completed, clear the DTCs and then check that the vehicle has returned to normal by performing the following All Readiness check procedure.

  1. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
  2. Turn the ignition switch off and wait for 3 minutes or more.
  3. Turn the ignition switch to ON and turn the GTS on.
  4. Wait for 5 seconds or more with the ignition switch to ON.
  5. Enter the following menus: Powertrain / Transmission / Utility / All Readiness.
  6. Input the DTC: U012987.
  7. Check the DTC judgment result.

    GTS Display

    Description

    NORMAL

    • DTC judgment completed
    • System normal

    ABNORMAL

    • DTC judgment completed
    • System abnormal

    INCOMPLETE

    • DTC judgment not completed
    • Perform driving pattern after confirming DTC enabling conditions

    N/A

    • Unable to perform DTC judgment
    • Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit

    HINT:

    • If the judgment result shows NORMAL, the system is normal.
    • If the judgment result shows ABNORMAL, the system has a malfunction.
    • If the judgment result shows INCOMPLETE or N/A, perform the Confirmation Driving Pattern and check the DTC judgment result again.

CAUTION / NOTICE / HINT

NOTICE:

  • Perform registration and/or initialization when parts related to the continuously variable transaxle system are replaced.

    Click here

  • Check that no DTCs are stored after performing initialization.

    Click here

PROCEDURE

1.

CLEAR DTC AND PERFORM ROAD TEST

(a) Clear the DTCs.

Powertrain > Transmission > Clear DTCs

HINT:

Write down the currently output DTCs before clearing them.

(b) Start the engine and drive the vehicle at a low speed.

NEXT

2.

CHECK DTC OUTPUT (DTC U012987)

(a) Enter the following menus:

Powertrain > Transmission > Trouble Codes

(b) Read the DTCs using the GTS.

Result

Proceed to

DTC U012987 is not output

A

DTC U012987 is output

B

A

CHECK FOR INTERMITTENT PROBLEMS

Click here

Click here

B

GO TO CAN COMMUNICATION SYSTEM

    READ NEXT:

     Lost Communication with Stop and Start Control Module Missing Message (U110387)

    DESCRIPTION The TCM and engine stop and start ECU send and receive signals via CAN communication. If a communication error occurs between the TCM and engine stop and start ECU, the TCM stores this

     Transmission Control Switch Circuit

    DESCRIPTION After moving the shift lever to M, it is possible to change the shift range between M1 and M10 using the shift lever. Moving the shift lever to "+" once raises the shift ran

     ECU Power Source Circuit

    DESCRIPTION When the ignition switch is turned to ON, auxiliary battery voltage is applied to terminal MREL of the ECM through the coil of the EFI-MAIN relay. This causes the EFI-MAIN relay to cl

    SEE MORE:

     Diagnosis System

    DIAGNOSIS SYSTEM NOTICE: The following communication bus check screen is provided only as an example. This screen differs from the actual screen for this vehicle. Description of "Communication Bus Check" Screen HINT: The ECUs and sensors that are normally connected to the CAN commun

     Diagnostic Trouble Code Chart

    DIAGNOSTIC TROUBLE CODE CHART Power Door Lock Control System DTC No. Detection Item Link B124300 Impact Detection Sensor Circuit Malfunction

    © 2020-2024 Copyright www.tcorollacross.com