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Home >> Toyota >> 2015 >> Avalon Hybrid Limited >> Repair and Diagnosis >> Brakes >> Anti-Lock Brakes >> Electronically Controlled Brake System - Diagnostic Codes (1 Of 2) - (Hybrid) >> Electronically Controlled Brake System >> DTC C1252/52: Brake Booster Pump Motor on Time Abnormally Long; DTC C1253/53: Pump Motor Relay Malfunction [10/2014 - ] >> Procedure

DTC C1252/52: Brake Booster Pump Motor on Time Abnormally Long; DTC C1253/53: Pump Motor Relay Malfunction [10/2014 - ]: Procedure

  1. PERFORM ACTIVE TEST USING TECHSTREAM (ABS MOTOR RELAY) 
    1. Connect the Techstream to the DLC3.
    2. Turn the power switch on (IG).
    3. Select the Active Test on the Techstream (Refer to DATA LIST / ACTIVE TEST [10/2014 - 10/2015] or DATA LIST / ACTIVE TEST [10/2015 - ] ).
      ABS/VSC/TRAC

      Tester Display Test Part Control Range Diagnostic Note
      ECB* Motor Relay ABS motor relay Relay ON/OFF -

      *: Electronically Controlled Brake System

    4. Select the Data List on the Techstream (Refer to DATA LIST / ACTIVE TEST [10/2014 - 10/2015] or DATA LIST / ACTIVE TEST [10/2015 - ] ).
      ABS/VSC/TRAC

      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      ECB* Motor Relay ABS motor relay / ON or OFF ON: Relay on
      OFF: Relay off      		 -

      *: Electronically Controlled Brake System

    5. Check the operating condition of the ABS motor relay when operating it using the Techstream.

      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

    Result: 

    B 

    See step  6

    Result: 

    A 

    See step  2

  2. INSPECT BRAKE BOOSTER PUMP ASSEMBLY 
    1. Turn the power switch off.
      GTY598666Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Make sure that there is no looseness at the locking part and the connecting part of the connectors.
    3. Disconnect the A56 and A57 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
      A56-2 (BM1) - A56-4 (GND1) Always Below 10 Ω
      A57-2 (BM2) - A57-1 (GND2) Always Below 10 Ω
      A56-2 (BM1) - A57-2 (BM2) Always Below 1 Ω
      A56-4 (GND1) - A57-1 (GND2) Always Below 1 Ω
      TEXT IN ILLUSTRATION

      *a Component without harness connected
      (Brake Booster Pump Assembly)

    Result: 

    NG 

    REPLACE BRAKE BOOSTER PUMP ASSEMBLY 

    (Refer to REMOVAL [10/2014 - ] )

    Result: 

    OK 

    See step  3

  3. CHECK HARNESS AND CONNECTOR (GND TERMINAL) 
    1. Measure the resistance according to the value (s) in the table below.
      GTY578425Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard Resistance

      Tester Connection Condition Specified Condition
      A56-4 (GND1) - Body ground Always Below 1 Ω
      A57-1 (GND2) - Body ground Always Below 1 Ω
      TEXT IN ILLUSTRATION

      *a Front view of wire harness connector
      (to Brake Booster Pump Assembly)

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR (GND CIRCUIT) 

    Result: 

    OK 

    See step  4

  4. READ VALUE USING TECHSTREAM (ACCUMULATOR PRESSURE SENSOR) 
    1. Reconnect the A56 and A57 brake booster pump assembly connectors.
    2. Connect the Techstream to the DLC3.
    3. Turn the power switch on (IG).
    4. Select the Data List on the Techstream (Refer to DATA LIST / ACTIVE TEST [10/2014 - 10/2015] or DATA LIST / ACTIVE TEST [10/2015 - ] ).
      ABS/VSC/TRAC

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

    NG 

    See step  8

    Result: 

    OK 

    See step  5

  5. RECONFIRM DTC 
    1. Turn the power switch off.
    2. Clear the DTCs (Refer to DTC CHECK / CLEAR [10/2014 - ] ).
    3. Turn the power switch on (IG).
    4. Check if the same DTC is output (Refer to DTC CHECK / CLEAR [10/2014 - ] ).

      Result

      Result Proceed to
      DTCs C1252/52 and C1253/53 are not output. A
      DTCs C1252/52 and/or C1253/53 are output. B

    Result: 

    A 

    USE SIMULATION METHOD TO CHECK 

    (Refer to HOW TO PROCEED WITH TROUBLESHOOTING [10/2014 - 10/2015] or HOW TO PROCEED WITH TROUBLESHOOTING [10/2015 - ] )

    Result: 

    B 

    REPLACE BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY 

    (Refer to REMOVAL [10/2014 - ] )

  6. CHECK HARNESS AND CONNECTOR (MRI TERMINAL) 
    1. Turn the power switch off.
      GTY545148Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Make sure that there is no looseness at the locking part and the connecting part of the connector.
    3. Disconnect the A51 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
      A51-1 (MRI1) - Body ground Always 11 to 14 V
      A51-2 (MRI2) - Body ground Always 11 to 14 V
      TEXT IN ILLUSTRATION

      *a Front view of wire harness connector
      (to Skid Control ECU (Brake Booster with Master Cylinder Assembly))

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR (MRI CIRCUIT) 

    Result: 

    OK 

    See step  7

  7. 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 A56 and A57 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
      A51-29 (MRO1) - A56-2 (BM1) Always Below 1 Ω
      A51-29 (MRO1) - Body ground Always 10 kΩ or higher
      A56-2 (BM1) - Body ground Always 10 kΩ or higher
      A51-30 (MRO2) - A57-2 (BM2) Always Below 1 Ω
      A51-30 (MRO2) - Body ground Always 10 kΩ or higher
      A57-2 (BM2) - Body ground Always 10 kΩ or higher

    Result: 

    OK 

    REPLACE BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY 

    (Refer to REMOVAL [10/2014 - ] )

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  8. PERFORM ACTIVE TEST USING TECHSTREAM (SOLENOID VALVE) 
    1. Select the Active Test on the Techstream (Refer to DATA LIST / ACTIVE TEST [10/2014 - 10/2015] or DATA LIST / ACTIVE TEST [10/2015 - ] ).

      HINT: 

      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).
      ABS/VSC/TRAC

      Tester Display Test Part 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

      *: Electronically Controlled Brake System

    2. Perform the Active Test of the solenoid using the Techstream.
    3. Select the Data List on the Techstream (Refer to DATA LIST / ACTIVE TEST [10/2014 - 10/2015] or DATA LIST / ACTIVE TEST [10/2015 - ] ).
      ABS/VSC/TRAC

      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
    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.

      HINT: 

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

    Result: 

    OK 

    REPLACE BRAKE BOOSTER PUMP ASSEMBLY 

    (Refer to REMOVAL [10/2014 - ] )

    Result: 

    NG 

    REPLACE BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY 

    (Refer to REMOVAL [10/2014 - ] )

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