ELECTRONICALLY CONTROLLED BRAKE SYSTEM, Diagnostic DTC:C1252/52, C1253/53

DTC Code DTC Name
C1252/52 Brake Booster Pump Motor on Time Abnormally Long
C1253/53 Pump Motor Relay Malfunction

DESCRIPTION

The skid control ECU (brake booster with master cylinder assembly) detects decreases in the accumulator pressure according to the data from the accumulator pressure sensor, and then starts and stops the pump motor by operating the motor relay.

DTC No. Detection Item INF Code DTC Detection Condition Trouble Area Note
C1252/52 Brake Booster Pump Motor on Time Abnormally Long 311 The pump motor is operating continuously for 178 seconds or more. (When the relay is malfunctioning for 98 seconds or more.)

  • Short in motor circuit or motor monitor circuit

  • Motor relay stuck

  • Accumulator pressure sensor malfunction in brake actuator (Brake booster with master cylinder assembly)

  • Skid control ECU (Brake booster with master cylinder assembly)

 Electronically controlled brake system DTC
C1253/53 Pump Motor Relay Malfunction

321

322

323

324

325

326

327

328

329

  • INF Code: 321


    • With IG1 terminal voltage 9.5 V or more, the motor drive monitor remains off for 0.2 seconds or more after a motor drive on request.

  • INF Code: 322


    • The motor drive monitor remains on for 2 seconds or more after a motor drive off request.

  • INF Code: 323


    • A skid control ECU (brake booster with master cylinder assembly) internal motor drive logical inconsistency continues for 2 seconds or more.

  • INF Code: 324


    • An open circuit is detected in the skid control ECU (brake booster with master cylinder assembly) internal motor relays 1 and 2.

  • INF Code: 325


    • An open circuit is detected in the skid control ECU (brake booster with master cylinder assembly) internal motor relays 1 and 3.

  • INF Code: 326


    • An open circuit is detected in the skid control ECU (brake booster with master cylinder assembly) internal motor relays 2 and 3.

  • INF Code: 327


    • An open circuit is detected in the skid control ECU (brake booster with master cylinder assembly) internal motor relay 1.

  • INF Code: 328


    • An open circuit is detected in the skid control ECU (brake booster with master cylinder assembly) internal motor relay 2.

  • INF Code: 329


    • An open circuit is detected in the skid control ECU (brake booster with master cylinder assembly) internal motor relay 3.

  • INF Code: 321, 324, 325, 326, 327, 328, 329


    • Open in motor circuit or motor monitor circuit

    • Skid control ECU (Brake booster with master cylinder assembly)

  • INF Code: 322


    • Short in motor circuit or motor monitor circuit

    • Skid control ECU (Brake booster with master cylinder assembly)

  • INF Code: 323


    • Skid control ECU (Brake booster with master cylinder assembly)

 Electronically controlled brake system DTC

WIRING DIAGRAM

A01MFXYE03

CAUTION / NOTICE / HINT

Note


  • When replacing the skid control ECU (brake booster with master cylinder assembly) or brake actuator (brake booster with master cylinder assembly), perform initialization and calibration of the linear solenoid valve.

    Click here

  • Inspect the fuses for circuits related to this system before performing the following procedure.

PROCEDURE


  1. PERFORM ACTIVE TEST USING GTS (ECB MOTOR RELAY)


    1. Connect the GTS to the DLC3.

    2. Turn the power switch on (IG).

    3. Select the Active Test on the GTS.

      Click here


      Chassis > ABS/VSC/TRC > Active Test
      Tester Display Measurement Item Control Range Diagnostic Note
      ECB Motor Relay ABS motor relay Relay ON/OFF ECB: Electronically Controlled Brake System

      Chassis > ABS/VSC/TRC > Active Test
      Tester Display
      ECB Motor Relay

    4. Select the Data List on the GTS.

      Click here


      Chassis > ABS/VSC/TRC > Data List
      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      ECB Motor Relay ABS motor relay ON or OFF

      ON: Relay on

      OFF: Relay off

      		 ECB: Electronically Controlled Brake System

      Chassis > ABS/VSC/TRC > Data List
      Tester Display
      ECB Motor Relay

    5. Check the operating condition of the ABS motor relay when operating it with the GTS.

      Result
      Result Proceed to
      ABS motor relay in the Data List turns ON/OFF using the Active Test. A
      ABS motor relay in the Data List does not change using the Active Test. B

    B

    CHECK HARNESS AND CONNECTOR (MRI TERMINAL) Click here

    A

  2. INSPECT BRAKE BOOSTER PUMP ASSEMBLY


    1. A01MIPYC21
      *a

      Component without harness connected

      (Brake Booster Pump Assembly)

      Turn the power switch off.

    2. Make sure that there is no looseness at the locking part and the connecting part of the connectors.

    3. Disconnect the A35 and A36 brake booster pump assembly connectors.

    4. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      A35-1 (BM1) - A35-2 (GND1) Always Below 10 Ω
      A36-2 (BM2) - A36-1 (GND2) Always Below 10 Ω
      A35-1 (BM1) - A36-2 (BM2) Always Below 1 Ω
      A35-2 (GND1) - A36-1 (GND2) Always Below 1 Ω
      Result
      Result Proceed to
      OK A
      NG (for RHD) B
      NG (for LHD) C

    B

    REPLACE BRAKE BOOSTER PUMP ASSEMBLY Click here

    C

    REPLACE BRAKE BOOSTER PUMP ASSEMBLY Click here

    A

  3. CHECK HARNESS AND CONNECTOR (GND TERMINAL)


    1. A01MJO2C02
      *a

      Front view of wire harness connector

      (to Brake Booster Pump Assembly)

      Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      A35-2 (GND1) - Body ground Always Below 1 Ω
      A36-1 (GND2) - Body ground Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (GND CIRCUIT)

    OK

  4. READ VALUE USING GTS (ACCUMULATOR SENSOR)


    1. Reconnect the A35 and A36 brake booster pump assembly connectors.

    2. Connect the GTS to the DLC3.

    3. Turn the power switch on (IG).

    4. Select the Data List on the GTS.

      Click here


      Chassis > ABS/VSC/TRC > Data List
      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      Accumulator Sensor Accumulator pressure sensor Min.: 0.00 V, Max.: 5.00 V Specified value: 2.90 to 4.20 V When brake fluid is stored in the accumulator: Accumulator pressure changes in accordance with volume of fluid stored in the accumulator

      Chassis > ABS/VSC/TRC > Data List
      Tester Display
      Accumulator Sensor

    5. Depress the brake pedal 4 or 5 times to operate the pump motor.

    6. Wait for 30 seconds without depressing the brake pedal.

    7. Check that the accumulator pressure sensor output value change is within the specified range.

      OK
      Accumulator pressure sensor output value change is less than 0.55 V.
      Result
      Proceed to
      OK
      NG

    NG

    PERFORM ACTIVE TEST USING GTS (ECB SOLENOID (SMC/SRC/SCC)) Click here

    OK

  5. RECONFIRM DTC


    1. Clear the DTCs.

      Click here


      Chassis > ABS/VSC/TRC > Clear DTCs

    2. Turn the power switch off.

    3. Turn the power switch on (IG).

    4. Check if the same DTC is output.

      Click here


      Chassis > ABS/VSC/TRC > Trouble Codes
      Result
      Result Proceed to
      DTCs C1252/52 and C1253/53 are not output. A
      DTCs C1252/52 and/or C1253/53 are output (for RHD). B
      DTCs C1252/52 and/or C1253/53 are output (for LHD). C

    A

    USE SIMULATION METHOD TO CHECK Click here

    B

    REPLACE BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY Click here

    C

    REPLACE BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY Click here

  6. PERFORM ACTIVE TEST USING GTS (ECB SOLENOID (SMC/SRC/SCC))


    1. Select the Active Test on the GTS.

      Click here


      Chassis > ABS/VSC/TRC > Active Test
      Tester Display Measurement Item Control Range Diagnostic Note
      ECB Solenoid (SMC/SRC/SCC) Switching solenoid valve (SMC/SRC/SCC) Solenoid ON/OFF

      • Operation sound of solenoid (clicking sound) can be heard

      • ECB: Electronically Controlled Brake System

      Chassis > ABS/VSC/TRC > Active Test
      Tester Display
      ECB Solenoid (SMC/SRC/SCC)

      Tech Tips

      The Active Test can be performed when the following conditions are met.


      • ABS main relay is on.

      • Shift lever is in P.

      • Parking brake is applied.

      • Vehicle speed is 0 km/h (0 mph).

    2. Perform the Active Test of the solenoid using the GTS.

    3. Select the Data List on the GTS.

      Click here


      Chassis > ABS/VSC/TRC > Data List
      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      Wheel Cylinder Pressure Sensor Wheel cylinder pressure sensor Min.: 0.00 V, Max.: 5.00 V Brake pedal released: 0.10 to 0.90 V Reading increases when brake pedal is depressed

      Chassis > ABS/VSC/TRC > Data List
      Tester Display
      Wheel Cylinder Pressure Sensor

    4. Check that the output value of the wheel cylinder pressure sensor does not increase.

      OK
      The output value of the wheel cylinder pressure sensor does not increase.

      Tech Tips

      If the output value increases, there may be brake fluid leaks in the brake actuator.

      Result
      Result Proceed to
      OK (for RHD) A
      OK (for LHD) B
      NG (for RHD) C
      NG (for LHD) D

    A

    REPLACE BRAKE BOOSTER PUMP ASSEMBLY Click here

    B

    REPLACE BRAKE BOOSTER PUMP ASSEMBLY Click here

    C

    REPLACE BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY Click here

    D

    REPLACE BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY Click here

  7. CHECK HARNESS AND CONNECTOR (MRI TERMINAL)


    1. A01MK1FC10
      *a

      Front view of wire harness connector

      (to Skid Control ECU (Brake Booster with Master Cylinder Assembly))

      Turn the power switch off.

    2. Make sure that there is no looseness at the locking part and the connecting part of the connector.

    3. Disconnect the A63 skid control ECU (brake booster with master cylinder assembly) connector.

    4. Measure the voltage according to the value(s) in the table below.

      Standard Voltage
      Tester Connection Condition Specified Condition
      A63-1 (MRI1) - Body ground Always 11 to 14 V
      A63-2 (MRI2) - Body ground Always 11 to 14 V
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (MRI CIRCUIT)

    OK

  8. CHECK HARNESS AND CONNECTOR (BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY - BRAKE BOOSTER PUMP ASSEMBLY)


    1. Make sure that there is no looseness at the locking part and the connecting part of the connectors.

    2. Disconnect the A35 and A36 brake booster pump assembly connectors.

    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      A63-29 (MRO1) - A35-1 (BM1) Always Below 1 Ω
      A63-29 (MRO1) or A35-1 (BM1) - Body ground Always 10 kΩ or higher
      A63-30 (MRO2) - A36-2 (BM2) Always Below 1 Ω
      A63-30 (MRO2) or A36-2 (BM2) - Body ground Always 10 kΩ or higher
      Result
      Result Proceed to
      OK (for RHD) A
      OK (for LHD) B
      NG C

    A

    REPLACE BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY Click here

    B

    REPLACE BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY Click here

    C

    REPAIR OR REPLACE HARNESS OR CONNECTOR