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Home >> Toyota >> 2016 >> Highlander Hybrid Limited >> Repair and Diagnosis >> Brakes >> Anti-Lock Brakes >> Electronically Controlled Brake System - Diagnostic Codes & Symptom Tests - (Hybrid) >> Electronically Controlled Brake System >> DTC C1252-52: Brake Booster Pump Motor on Time Abnormally Long; DTC C1253-53: Pump Motor Relay Malfunction [11/2016 - ] >> Procedure

DTC C1252-52: Brake Booster Pump Motor on Time Abnormally Long; DTC C1253-53: Pump Motor Relay Malfunction [11/2016 - ]: 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 [11/2016 - ]

      Chassis > ABS/VSC/TRAC > Active Test 

      Tester Display Measurement Item Control Range Diagnostic Note
      ECB Motor Relay ABS motor relay 1 Relay ON/OFF
      • Operation sound of relay (clicking sound) and pump motor can be heard
      • ECB: Electronically Controlled Brake System
      ECB Motor Relay2 ABS motor relay 2 Relay ON/OFF
      • Operation sound of relay (clicking sound) and pump motor can be heard
      • ECB: Electronically Controlled Brake System

      Chassis > ABS/VSC/TRAC > Active Test 

      Tester Display
      ECB Motor Relay

      Chassis > ABS/VSC/TRAC > Active Test 

      Tester Display
      ECB Motor Relay2
    4. Check the operation sound of the ABS motor relay and motor when operating it using the Techstream.

      OK

      The operation sound of the ABS motor relay and motor should be heard.

      Result

      Proceed to
      OK
      NG

    Result:  2

    NG 

    See step  7

    Result:  1

    OK 

    See step  2

  2. INSPECT BRAKE BOOSTER PUMP ASSEMBLY 
    1. Make sure that there is no looseness at the locking part and the connecting part of the connectors.
      GTY444291Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component without harness connected
      (Brake Booster Pump Assembly)
    2. Disconnect the A49 and A50 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
      A49-2 (BM1) - A49-4 (GND1) Always Below 10 Ω
      A50-2 (BM2) - A50-1 (GND2) Always Below 10 Ω
      A49-2 (BM1) - A50-2 (BM2) Always Below 1 Ω
      A49-4 (GND1) - A50-1 (GND2) Always Below 1 Ω
      A49-2 (BM1) - A49-1 (MTT) Always 950 to 1050 Ω
      A50-2 (BM2) - A49-1 (MTT) Always 950 to 1050 Ω

      Result

      Proceed to
      OK
      NG

    Result:  2

    NG 

    REPLACE BRAKE BOOSTER PUMP ASSEMBLY. Refer to  REMOVAL [02/2014 - ] 

    Result:  1

    OK 

    See step  3

  3. CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU ASSEMBLY - BRAKE BOOSTER PUMP ASSEMBLY) 
    1. Make sure that there is no looseness at the locking part and the connecting part of the connector.
    2. Disconnect the A62 skid control ECU assembly connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      A62-29 (MTT) - A49-1 (MTT) Always Below 1 Ω
      A62-29 (MTT) or A49-1 (MTT) - Body ground Always 10 kΩ or higher
      A49-4 (GND1) - Body ground Always Below 1 Ω
      A50-1 (GND2) - Body ground Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Result:  2

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result:  1

    OK 

    See step  4

  4. READ VALUE USING TECHSTREAM (ACCUMULATOR PRESSURE SENSOR) 
    1. Reconnect the A62 skid control ECU assembly connector.
    2. Reconnect the A49 and A50 brake booster pump assembly connectors.
    3. Connect the Techstream to the DLC3.
    4. Turn the power switch on (IG).
    5. Select the Data List on the Techstream.

      Refer to DATA LIST / ACTIVE TEST [11/2016 - ]

      Chassis > ABS/VSC/TRAC > 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: 2.60 to 3.80 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/TRAC > Data List 

      Tester Display
      Accumulator Sensor
    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 0.20 V.

      Result

      Proceed to
      OK
      NG

    Result:  2

    NG 

    See step  6

    Result:  1

    OK 

    See step  5

  5. RECONFIRM DTC 
    1. Turn the power switch off.
    2. Clear the DTCs.

      Refer to DTC CHECK / CLEAR [02/2014 - ]

      Chassis > ABS/VSC/TRAC > Clear DTCs 

    3. Turn the power switch off.
    4. Turn the power switch on (IG).
    5. Check if the same DTC is output.

      Refer to DTC CHECK / CLEAR [02/2014 - ]

      Chassis > ABS/VSC/TRAC > 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. B

    Result:  1

    A 

    USE SIMULATION METHOD TO CHECK. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [11/2016 - ] 

    Result:  2

    B 

    REPLACE SKID CONTROL ECU ASSEMBLY. Refer to  REMOVAL [02/2014 - ] 

  6. PERFORM ACTIVE TEST USING TECHSTREAM (SOLENOID VALVE) 
    1. Select the Active Test on the Techstream.

      Refer to DATA LIST / ACTIVE TEST [11/2016 - ]

      Chassis > ABS/VSC/TRAC > Active Test 

      Tester Display Measurement Item Control Range Diagnostic Note
      ECB Solenoid (SMC1) Master cut solenoid (SMC1) Solenoid ON/OFF ECB: Electronically Controlled Brake System
      ECB Solenoid (SMC2) Master cut solenoid (SMC2) Solenoid ON/OFF ECB: Electronically Controlled Brake System
      ECB Solenoid (SLRRL) Linear solenoid reduction valve (SLR) Solenoid ON/OFF ECB: Electronically Controlled Brake System
      ECB Solenoid (SLRRR) Linear solenoid reduction valve (SLR) Solenoid ON/OFF ECB: Electronically Controlled Brake System

      Chassis > ABS/VSC/TRAC > Active Test 

      Tester Display
      ECB Solenoid (SMC1)

      Chassis > ABS/VSC/TRAC > Active Test 

      Tester Display
      ECB Solenoid (SMC2)

      Chassis > ABS/VSC/TRAC > Active Test 

      Tester Display
      ECB Solenoid (SLRRL)

      Chassis > ABS/VSC/TRAC > Active Test 

      Tester Display
      ECB Solenoid (SLRRR)

      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).
    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 [11/2016 - ]

      Chassis > ABS/VSC/TRAC > Data List 

      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      FR W/C Sensor Front wheel cylinder pressure sensor RH Min.: 0.00 V, Max.: 5.00 V Brake pedal released: 0.30 to 0.70 V Reading increases when brake pedal is depressed
      FL W/C Sensor Front wheel cylinder pressure sensor LH Min.: 0.00 V, Max.: 5.00 V Brake pedal released: 0.30 to 0.70 V Reading increases when brake pedal is depressed
      RR W/C Sensor Rear wheel cylinder pressure sensor RH Min.: 0.00 V, Max.: 5.00 V Brake pedal released: 0.30 to 0.70 V Reading increases when brake pedal is depressed
      RL W/C Sensor Rear wheel cylinder pressure sensor LH Min.: 0.00 V, Max.: 5.00 V Brake pedal released: 0.30 to 0.70 V Reading increases when brake pedal is depressed

      Chassis > ABS/VSC/TRAC > Data List 

      Tester Display
      FR W/C Sensor

      Chassis > ABS/VSC/TRAC > Data List 

      Tester Display
      FL W/C Sensor

      Chassis > ABS/VSC/TRAC > Data List 

      Tester Display
      RR W/C Sensor

      Chassis > ABS/VSC/TRAC > Data List 

      Tester Display
      RL W/C Sensor
    4. Check that the output value of each wheel cylinder pressure sensor does not increase.

      OK

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

      HINT: 

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

      Result

      Result Proceed to
      The output value of any wheel cylinder pressure sensor increases. A
      The output values of all wheel cylinder pressure sensors do not increase. B

    Result:  1

    A 

    REPLACE BRAKE ACTUATOR ASSEMBLY. Refer to  REMOVAL [02/2014 - ] 

    Result:  2

    B 

    REPLACE BRAKE BOOSTER PUMP ASSEMBLY. Refer to  REMOVAL [02/2014 - ] 

  7. INSPECT ABS MOTOR RELAY 
    1. Remove the ABS motor relay (ABS MTR NO. 1 and ABS MTR NO. 2 relays).
      GTY426233Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 ABS Motor Relay (ABS MTR NO. 1 or ABS MTR NO. 2 relay)
      *a R1- or R2- Terminal
      *b MR1 or MR2 Terminal
      *c BM1 or BM2 Terminal
      *d +BM1 or +BM2 Terminal
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      FOR ABS MTR NO. 1 RELAY

      Tester Connection Condition Specified Condition
      3 (BM1) - 5 (+BM1) Voltage is not applied between terminals 1 (R1-) and 2 (MR1) 10 kΩ or higher
      3 (BM1) - 5 (+BM1) Voltage is applied between terminals 1 (R1-) and 2 (MR1) Below 1 Ω
      FOR ABS MTR NO. 2 RELAY

      Tester Connection Condition Specified Condition
      3 (BM2) - 5 (+BM2) Voltage is not applied between terminals 1 (R2-) and 2 (MR2) 10 kΩ or higher
      3 (BM2) - 5 (+BM2) Voltage is applied between terminals 1 (R2-) and 2 (MR2) Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Result:  2

    NG 

    REPLACE ABS MOTOR RELAY 

    Result:  1

    OK 

    See step  8

  8. CHECK HARNESS AND CONNECTOR (POWER SOURCE TERMINAL) 
    1. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      ABS MTR NO. 1 relay terminal 5 (+BM1) - Body ground Always 11 to 14 V
      ABS MTR NO. 2 relay terminal 5 (+BM2) - Body ground Always 11 to 14 V
      GTY445740Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 NO. 3 Engine Room Relay Block
      *2 ABS MTR NO. 2 Relay
      *3 ABS MTR NO. 1 Relay

      Result

      Proceed to
      OK
      NG

    Result:  2

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT) 

    Result:  1

    OK 

    See step  9

  9. CHECK HARNESS AND CONNECTOR (BRAKE BOOSTER PUMP ASSEMBLY - NO. 2 ENGINE ROOM RELAY BLOCK ASSEMBLY) 
    1. Make sure that there is no looseness at the locking part and the connecting part of the connector.
    2. Disconnect the A49 and A50 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
      A49-2 (BM1) - ABS MTR NO. 1 relay terminal 3 (BM1) Always Below 1 Ω
      A49-2 (BM1) or ABS MTR NO. 1 relay terminal 3 (BM1) - Body ground Always 10 kΩ or higher
      A50-2 (BM2) - ABS MTR NO. 2 relay terminal 3 (BM2) Always Below 1 Ω
      A50-2 (BM2) or ABS MTR NO. 2 relay terminal 3 (BM2) - Body ground Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result:  2

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result:  1

    OK 

    See step  10

  10. CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU ASSEMBLY - NO. 2 ENGINE ROOM RELAY BLOCK ASSEMBLY) 
    1. Make sure that there is no looseness at the locking part and the connecting part of the connectors.
    2. Disconnect the A65 and A62 skid control ECU assembly connectors.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      A62-24 (R1-) - ABS MTR NO. 1 relay terminal 1 (R1-) Always Below 1 Ω
      A62-24 (R1-) or ABS MTR NO. 1 relay terminal 1 (R1-) - Body ground Always 10 kΩ or higher
      A62-11 (MR1) - ABS MTR NO. 1 relay terminal 2 (MR1) Always Below 1 Ω
      A62-11 (MR1) or ABS MTR NO. 1 relay terminal 2 (MR1) - Body ground Always 10 kΩ or higher
      A65-14 (R2-) - ABS MTR NO. 2 relay terminal 1 (R2-) Always Below 1 Ω
      A65-14 (R2-) or ABS MTR NO. 2 relay terminal 1 (R2-) - Body ground Always 10 kΩ or higher
      A65-17 (MR2) - ABS MTR NO. 2 relay terminal 2 (MR2) Always Below 1 Ω
      A65-17 (MR2) or ABS MTR NO. 2 relay terminal 2 (MR2) - Body ground Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result:  1

    OK 

    REPLACE SKID CONTROL ECU ASSEMBLY. Refer to  REMOVAL [02/2014 - ] 

    Result:  2

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

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