Last Modified: 07-31-2024 6.11:8.1.0 Doc ID: RM1000000025DUN
Model Year Start: 2023 Model: Corolla Prod Date Range: [09/2022 -           ]
Title: BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: ELECTRONICALLY CONTROLLED BRAKE SYSTEM (for HV Model): C143A7E,C143A7F,C143D49,C14DA14; ABS Solenoid Control Module Actuator Stuck On; 2023 - 2025 MY Corolla Corolla HV [09/2022 -        ]

DTC

C143A7E

ABS Solenoid Control Module Actuator Stuck On

DTC

C143A7F

ABS Solenoid Control Module Actuator Stuck Off

DTC

C143D49

ABS Solenoid Control Module Internal Electronic Failure

DTC

C14DA14

ABS Solenoid Supply Voltage Circuit Short to Ground or Open

DESCRIPTION

The ABS solenoid relay is built into the skid control ECU in the brake actuator assembly. The ABS solenoid relay supplies power to each solenoid.

The skid control ECU (brake actuator assembly) detects an ABS solenoid relay malfunction by performing a self-check and relay operation check.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

MIL

DTC Output from

Note

C143A7E

ABS Solenoid Control Module Actuator Stuck On

When an ABS solenoid relay OFF request is sent, the ABS solenoid relay remains ON for 0.065 seconds or more.

Skid control ECU (brake actuator assembly)

Comes on

Brake/EPB
  • SAE Code: C143B
  • Output ECU: Skid control ECU (brake actuator assembly)

C143A7F

ABS Solenoid Control Module Actuator Stuck Off

When an ABS solenoid relay ON request is sent, the ABS solenoid relay remains OFF for 0.015 seconds or more.

Skid control ECU (brake actuator assembly)

Comes on

Brake/EPB
  • SAE Code: C143C
  • Output ECU: Skid control ECU (brake actuator assembly)

C143D49

ABS Solenoid Control Module Internal Electronic Failure

A malfunction in the ABS solenoid relay drive circuit is detected during the self-test.

Skid control ECU (brake actuator assembly)

Comes on

Brake/EPB
  • SAE Code: C143D (Case 1 to 3)
  • Output ECU: Skid control ECU (brake actuator assembly)

C14DA14

ABS Solenoid Supply Voltage Circuit Short to Ground or Open

The ABS solenoid voltage is less than 40% of the +BS voltage for 0.185 seconds or more.

Skid control ECU (brake actuator assembly)

Comes on

Brake/EPB
  • SAE Code: C14DB (Case 1 and 2)
  • Output ECU: Skid control ECU (brake actuator assembly)

MONITOR DESCRIPTION

C143B and C143C:

  • The skid control ECU (brake actuator assembly) monitors the voltage of the ABS solenoid relay. By comparing the voltage upstream of the relay to the voltage downstream of the relay, it can detect if the relay is stuck on (relay remains on during OFF command), or stuck off (relay remains off during ON command). If the relay is stuck on or stuck off for a certain amount of time, the skid control ECU (brake actuator assembly) illuminates the MIL and stores this DTC.

C143D (Case 1 to 3):

  • The ABS solenoid relay has a self-diagnosis function that monitors the relay and relay drive circuit. When the self-diagnosis function detects a relay or relay drive circuit malfunction, the skid control ECU (brake actuator assembly) illuminates the MIL and stores this DTC.

C14DB (Case 1 and 2):

  • When a short to ground in the ABS solenoid relay continues for a certain amount of time, the skid control ECU (brake actuator assembly) illuminates the MIL and stores this DTC.

MONITOR STRATEGY

Related DTCs

C143B: Valve supply voltage monitoring (turning OFF impossible)

C143C: Valve supply voltage monitoring (turning ON impossible)

C143D (Case 1): Fail-safe logic test (shorted high)

C143D (Case 2): Fail-safe logic test (shorted low)

C143D (Case 3): Fail-safe logic test

C14DB (Case 1): Valve supply voltage monitoring (Valve supply voltage short to GND-high ohmic short)

C14DB (Case 2): Valve supply voltage monitoring (Valve supply voltage short to GND-low ohmic short)

Required Sensors/Components(Main)

Skid control ECU (brake actuator assembly)

Required Sensors/Components(Related)

Skid control ECU (brake actuator assembly)

Frequency of Operation

During initial checking

Duration

-: C143D (Case 1 to 3)

0.015 seconds: C143C

0.025 seconds: C14DB (Case 2)

0.065 seconds: C143B

0.185 seconds: C14DB (Case 1)

MIL Operation

Immediately

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.

REPLACE BRAKE ACTUATOR ASSEMBLY

Click here 2023 - 2025 MY Corolla Corolla HV [09/2022 -        ]; BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: BRAKE ACTUATOR (for HV Model): REMOVAL

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