Toyota Corolla Cross Owners & Service Manuals

Toyota Corolla Cross: ECM Communication (C124A00)

DESCRIPTION

If the vehicle information stored by the skid control ECU (brake actuator assembly) does not match that sent from the ECM or a new skid control ECU (brake actuator assembly) is installed and the vehicle information has not been stored, this DTC is stored.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

MIL

DTC Output from

Note

C124A00

ECM Communication

Engine, drive source and destination information sent from the ECM does not match the information of the skid control ECU or there is no information in memory.

  • ECM
  • Skid control ECU (brake actuator assembly)

Comes on

Brake/EPB

  • SAE Code: C124A
  • Output ECU: Skid control ECU (brake actuator assembly)

MONITOR DESCRIPTION

After initial learning of the electronically controlled brake system is performed, CAN communication with the ECM is normal, and the destination information, engine information, or transmission information stored in both the ECM and skid control ECU does not match, the skid control ECU (brake actuator assembly) illuminates the MIL and stores this DTC.

MONITOR STRATEGY

Related DTCs

C124A (Case 1): Variant code value not supported

C124A (Case 2): Variant code value mismatch

C124A (Case 3): Variant code learning timeout

C124A (Case 4): Variant code value not rational

C124A (Case 5): Variant code read error

Required Sensors/Components(Main)

Skid control ECU (brake actuator assembly)

Required Sensors/Components(Related)

Skid control ECU (brake actuator assembly)

Frequency of Operation

Continuous

Duration

-: C124A (Case 1, 3, 4 and 5)

1.6 seconds: C124A (Case 2)

MIL Operation

2 driving cycles

Sequence of Operation

None

TYPICAL ENABLING CONDITIONS

Monitor runs whenever the following DTCs are not stored

TMC's intellectual property

Other conditions belong to TMC's intellectual property

-

TYPICAL MALFUNCTION THRESHOLDS

TMC's intellectual property

-

COMPONENT OPERATING RANGE

TMC's intellectual property

-

CONFIRMATION DRIVING PATTERN

NOTICE:

When performing the normal judgment procedure, make sure that the driver door is closed and is not opened at any time during the procedure.

HINT:

  • After repair has been completed, clear the DTC and then check that the vehicle has returned to normal by performing the following All Readiness check procedure.
  • When clearing the permanent DTCs, refer to the "CLEAR PERMANENT DTC" procedure.
  1. Connect the GTS to the DLC3.
  2. Turn the ignition switch to ON and turn the GTS on.
  3. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
  4. Turn the ignition switch off.
  5. Turn the ignition switch to ON (READY) and turn the GTS on.
  6. Wait for 1 second or more. [*]

    HINT:

    [*]: Normal judgment procedure.

    The normal judgment procedure is used to complete DTC judgment and also used when clearing permanent DTCs.

  7. Enter the following menus: Chassis / Brake/EPB* / Utility / All Readiness.

    *: Electric Parking Brake System

  8. Check the DTC judgment result.

    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, perform driving pattern again.

PROCEDURE

1.

CHECK PART NUMBER (ECM)

(a) Check that the proper ECM is installed.

OK:

Proper ECM is installed.

(b) Check if the ECM was replaced before the DTC was stored.

OK:

ECM was not replaced.

Result

Proceed to

OK

A

NG (A proper ECM is not installed and/or the ECM was replaced.)

B

B

REPLACE ECM

A

2.

CHECK PART NUMBER (BRAKE ACTUATOR ASSEMBLY)

(a) Check that a proper skid control ECU (brake actuator assembly) is installed.

OK:

Proper skid control ECU (brake actuator assembly) is installed.

(b) Check if the skid control ECU (brake actuator assembly) had been replaced before the DTC was stored.

OK:

Skid control ECU (brake actuator assembly) had not been replaced.

Result

Proceed to

OK

A

NG (The skid control ECU (brake actuator assembly) had been replaced.)

B

NG (A proper skid control ECU (brake actuator assembly) is not installed.)

C

A

REPLACE BRAKE ACTUATOR ASSEMBLY

C

REPLACE BRAKE ACTUATOR ASSEMBLY

B

3.

CONFIRM SYSTEM INFORMATION STORAGE

(a) Check that Store System Information has been performed.

OK:

Store System Information has been performed.

HINT:

After installing a new skid control ECU (brake actuator assembly), DTCs C051D54 and C124A00 will be stored until system variant learning is performed.

OK

REPLACE BRAKE ACTUATOR ASSEMBLY

NG

PERFORM SYSTEM INFORMATION MEMORIZATION

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