Toyota Corolla Cross Owners & Service Manuals

Toyota Corolla Cross: ABS Pump Motor Control Circuit Short to Ground (C052C11,C052C13,C052F14,C142719)

DESCRIPTION

The ABS motor relay is built into the brake actuator assembly.

When the skid control ECU (brake actuator assembly) operates ABS, TRAC, VSC, brake hold or brake assist, the ABS motor relay turns ON and drives the motor pump built into the brake actuator assembly.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

MIL

DTC Output from

Note

C052C11

ABS Pump Motor Control Circuit Short to Ground

When the voltage at terminal +BM is between 9.6 and 16.4 V, a short to ground in the ABS motor drive circuit is detected during the self-test.

Skid control ECU (brake actuator assembly)

Comes on

Brake/EPB

  • SAE Code: C052E (Case 1)
  • Output ECU: Skid control ECU (brake actuator assembly)

C052C13

ABS Pump Motor Control Circuit Open

An open in the ABS motor drive circuit is detected during the self-test.

Skid control ECU (brake actuator assembly)

Comes on

Brake/EPB

  • SAE Code: C052C (Case 3 and 6)
  • Output ECU: Skid control ECU (brake actuator assembly)

C052F14

ABS Pump Motor Supply Voltage Circuit Short to Ground or Open

  • When the pump motor is turned off after operating, 0.6 V or more is detected at the pump motor for 0.48 seconds or more.
  • The power supply of the ABS motor relay is less than 5 V for 0.15 seconds or more.

Skid control ECU (brake actuator assembly)

Comes on

Brake/EPB

  • SAE Code: C055B (Case 1 to 5)
  • Output ECU: Skid control ECU (brake actuator assembly)

C142719

ABS Pump Motor Circuit Current Above Threshold

  • When the ABS motor relay is operating, an overload in the ABS motor relay is detected for 0.06 seconds or more.
  • When the ABS motor relay is operating, a short in the pump motor drive circuit is detected for 0.06 seconds or more.

Skid control ECU (brake actuator assembly)

Comes on

Brake/EPB

  • SAE Code: C1427 (Case 1 and 2)
  • Output ECU: Skid control ECU (brake actuator assembly)

MONITOR DESCRIPTION

C052E:
  • The ABS motor 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.
C052C (Case 3 and 6) and C055B (Case 1, 2, 4 and 5):
  • The skid control ECU (brake actuator assembly) monitors the voltage of the ABS motor relay. If the voltage applied to the relay is a certain value or more or a certain value or less for a certain amount of time, the skid control ECU (brake actuator assembly) illuminates the MIL and stores this DTC.
C055B (Case 3):
  • The skid control ECU (brake actuator assembly) has a self-diagnosis function that monitors the pump motor circuit. Under certain conditions, if the pump motor or motor relay self-diagnosis fails a certain number of times for a certain amount of time, the skid control ECU (brake actuator assembly) illuminates the MIL and stores this DTC.
C1427 (Case 1 and 2):
  • The skid control ECU (brake actuator assembly) monitors the voltage of the ABS motor relay. If the voltage applied to the relay is excessively large or an internal malfunction is detected in the relay drive circuit, the skid control ECU (brake actuator assembly) illuminates the MIL and stores this DTC.

MONITOR STRATEGY

Related DTCs

C052C (Case 3): Freewheeling switch source monitoring

C052C (Case 6): Motor relay source monitoring

C052E: Motor relay gate test

C055B (Case 1): Pump motor run monitoring

C055B (Case 2): Motor relay drain supply monitoring

C055B (Case 3): Pump motor test timeout monitoring

C055B (Case 4): Motor relay supply voltage line monitoring (out of range high)

C055B (Case 5): Motor relay supply voltage line monitoring (out of range low)

C1427 (Case 1): Motor relay drain-source overvoltage monitoring

C1427 (Case 2): Pump motor application specific integrated circuit bit failure monitoring

Required Sensors/Components(Main)

Skid control ECU (brake actuator assembly)

Required Sensors/Components(Related)

Skid control ECU (brake actuator assembly)

Speed sensor

Frequency of Operation

Continuous: C052E

During initial checking: C052C (Case 3 and 6), C055B (Case 1 to 5), C1427 (Case 1 and 2)

Duration

-: C052E and C1427 (Case 2)

0.06 seconds: C052C (Case 3 and 6) and C1427 (Case 1)

0.10 seconds: C055B (Case 4 and 5)

0.15 seconds: C055B (Case 2)

0.48 seconds: C055B (Case 1)

60 seconds: C055B (Case 3)

MIL Operation

Immediately: C052C (Case 3), C052C (Case 6), C055B (Case 1), C055B (Case 2), C055B (Case 3), C055B (Case 4), C055B (Case 5), C1427 (Case 1) and C1427 (Case 2)

2 driving cycles: C052E

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. Depress the brake pedal several times to operate the pump motor of the brake actuator assembly. [*1]
  7. After the pump motor stops, wait for 2 seconds or more. [*2]

    HINT:

    [*1] to [*2]: Normal judgment procedure.

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

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

    *: Electric Parking Brake System

  9. 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

NEXT

END

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