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Home >> Lexus >> 2006 >> GS 300 RWD >> Repair and Diagnosis >> Brakes >> Brakes Control Systems >> Brake Control >> BRAKE CONTROL BRAKE ACTUATOR (w/ ECB) >> On-Vehicle Inspection

On-Vehicle Inspection

  1. INSPECT BRAKE ACTUATOR ASSEMBLY OPERATION 
    1. Pre-check preparation
      1. Move the shift lever to the P position. Apply the parking brake and connect the intelligent tester to the DLC3.
      2. Turn the engine switch on (IG).
      3. Turn on the intelligent tester. Select "MAS CYL PRS1", "MAS CYL PRS2", "FR PRESS SENS", "FL PRESS SENS" and "RL PRESS SENS"
    2. Check FR system solenoid (SLA**, SLR**, SMC1, SMC2)
      1. Select "SLAFR CUR". --> Enter and check the output voltage.
        NOTE: Do not depress the brake pedal.

        HINT:

        • It takes approximately 35 seconds to complete the check.
        • If incorrect, troubleshoot the brake system. (See PROBLEM SYMPTOMS TABLE  )

        Standard voltage 

        STANDARD VOLTAGE REFERENCE CHART

        Sensor 10 to 20 sec. after check start (V) 35 sec. or more after check start (V)
        MAS CYL PRS 1 0.3 to 0.7 0.3 to 0.7
        MAS CYL PRS 2 0.3 to 0.7 0.3 to 0.7
        FR PRESS SENS 2.5 to 4.5 0.3 to 0.7
        FL PRESS SENS 0.3 to 0.7 0.3 to 0.7
        RR PRESS SENS 0.3 to 0.7 0.3 to 0.7
        RL PRESS SENS 0.3 to 0.7 0.3 to 0.7
    3. Check FL system solenoid (SLA**, SLR**, SMC1, SMC2)
      1. Select "SLAFL CUR". --> Enter and check the output voltage.
        NOTE: Do not depress the brake pedal.

        HINT:

        • It takes approximately 35 seconds to complete the check.
        • If incorrect, troubleshoot the brake system. (See PROBLEM SYMPTOMS TABLE  )

        Standard voltage 

        STANDARD VOLTAGE REFERENCE CHART

        Sensor 10 to 20 sec. after check start (V) 35 sec. or more after check start (V)
        MAS CYL PRS 1 0.3 to 0.7 0.3 to 0.7
        MAS CYL PRS 2 0.3 to 0.7 0.3 to 0.7
        FR PRESS SENS 0.3 to 0.7 0.3 to 0.7
        FL PRESS SENS 2.5 to 4.5 0.3 to 0.7
        RR PRESS SENS 0.3 to 0.7 0.3 to 0.7
        RL PRESS SENS 0.3 to 0.7 0.3 to 0.7
    4. Check RR system solenoid (SLA**, SLR**, SMC1, SMC2)
      1. Select "SLARR CUR". --> Enter and check the output voltage.
        NOTE: Do not depress the brake pedal.

        HINT:

        • It takes approximately 35 seconds to complete the check.
        • If incorrect, troubleshoot the brake system. (See PROBLEM SYMPTOMS TABLE  )

        Standard voltage 

        STANDARD VOLTAGE REFERENCE CHART

        Sensor 10 to 20 sec. after check start (V) 35 sec. or more after check start (V)
        MAS CYL PRS 1 0.3 to 0.7 0.3 to 0.7
        MAS CYL PRS 2 0.3 to 0.7 0.3 to 0.7
        FR PRESS SENS 0.3 to 0.7 0.3 to 0.7
        FL PRESS SENS 0.3 to 0.7 0.3 to 0.7
        RR PRESS SENS 2.5 to 4.5 0.3 to 0.7
        RL PRESS SENS 0.3 to 0.7 0.3 to 0.7
    5. Check RL system solenoid (SLA**, SLR**, SMC1, SMC2)
      1. Select "SLAFL CUR". --> Enter and check the output voltage.
        NOTE: Do not depress the brake pedal.

        HINT:

        • It takes approximately 35 seconds to complete the check.
        • If incorrect, troubleshoot the brake system. (See PROBLEM SYMPTOMS TABLE  )

        Standard voltage 

        STANDARD VOLTAGE REFERENCE CHART

        Sensor 10 to 20 sec. after check start (V) 35 sec. or more after check start (V)
        MAS CYL PRS 1 0.3 to 0.7 0.3 to 0.7
        MAS CYL PRS 2 0.3 to 0.7 0.3 to 0.7
        FR PRESS SENS 0.3 to 0.7 0.3 to 0.7
        FL PRESS SENS 0.3 to 0.7 0.3 to 0.7
        RR PRESS SENS 0.3 to 0.7 0.3 to 0.7
        RL PRESS SENS 2.5 to 4.5 0.3 to 0.7
    6. Check SMC1, SMC2
      1. Select and enter "ECB INVALID" to prohibit the brake control (ECB) on the intelligent tester menu screen.
      2. Check that the ECB warning light comes on.
      3. Check the output voltage by depressing the pedal.

        Standard: 

        Difference in the output voltage between "MAS CYL PRS 1" and "FR PRESS SENS" is less than 0.4 V. 

        Difference in output voltage between "MAS CYL PRS 2" and "FL PRESS SENS" is less than 0.4 V. 

      4. Enter the return key on the intelligent tester and cancel brake control prohibition (ECB INVALID).
  2. INSPECT PRESSURE SENSOR OPERATION 
    1. Check battery voltage

      Standard voltage: 

      10 to 14 V (during engine stop) 

    2. Connect the hydro booster pressure gauge and pedal effort gauge.
      1. Install hydro LSPV gauge (SST) and brake pedal effort gauge.

        SST 09709-29018 

      2. Bleed the air from the hydro booster pressure gauge.
      3. Move the shift lever to the P position. Connect the intelligent tester to the DLC3 with the parking brake applied.
      4. Turn the engine switch on (IG).
      5. Clear the DTC. (See DIAGNOSIS SYSTEM  )
        Fig 1: Identifying Hydro Booster Pressure Gauge And Pedal Effort Gauge
        G04025222Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    3. Check wheel cylinder pressure sensor and master pressure sensor.
      1. Turn on the intelligent tester. Select "MAS CYL PRS 1", "MAS CYL PRS 2", "FR PRESS SENS", "FL PRESS SENS" and "RR PRESS SENS", "RL PRES SENS" into the date monitor.
      2. Check the brake pedal effort gauge, hydro booster pressure gauge reading, and output pressure voltage.

        If incorrect, troubleshoot the brake system. (See PROBLEM SYMPTOMS TABLE  )

        Standard voltage 

        STANDARD VOLTAGE REFERENCE CHART

        Brake effort N (kgf, lbf) MAS CYL PRS 1 (V) MAS CYL PRS 2 (V)
        200 (20.4, 45) 0.80 to 1.10 0.8 to 1.10
        500 (51, 112) 1.55 to 1.85 1.55 to 1.85
        STANDARD VOLTAGE REFERENCE CHART

        Brake effort N (kgf, lbf) Front right wheel hydraulic pressure MPa (kgf/cm2 , psi) FR PRESS SENS (V)
        50 (5.1, 11) 3.2 (32.6, 464) 1.0 to 1.3
        100 (10.2, 22) 7.0 (71.4, 1015) 1.75 to 2.05
        150 (15.3, 34) 8.3 (84.6, 1203) 2.05 to 2.35
        200 (20.4, 45) 8.3 (84.6, 1203) 2.05 to 2.35
        50 (5.1, 11) 3.2 (32.6, 464) 1.0 to 1.3
        100 (10.2, 22) 7.0 (71.4, 1015) 1.75 to 2.05
        150 (15.3, 34) 8.3 (84.6, 1203) 2.05 to 2.35
        200 (20.4, 45) 8.3 (84.6, 1203) 2.05 to 2.35
        STANDARD VOLTAGE REFERENCE CHART

        Brake effort N (kgf, lbf) Rear right wheel hydraulic pressure MPa (kgf/cm2 , psi) RR PRESS SENS (V)
        50 (5.1, 11) 3.1 (31.6, 449) 1.0 to 1.3
        100 (10.2, 22) 4.0 (40.8, 580) 1.15 to 1.45
        150 (15.3, 34) 4.0 (40.8, 580) 1.15 to 1.45
        200 (20.4, 45) 4.0 (40.8, 580) 1.15 to 1.45
        STANDARD VOLTAGE REFERENCE CHART

        Brake effort N (kgf, lbf) Rear left wheel hydraulic pressure MPa (kgf/cm2 , psi) RL PRESS SENS (V)
        50 (5.1, 11) 3.1 (31.6, 449) 1.0 to 1.3
        100 (10.2, 22) 4.0 (40.8, 580) 1.15 to 1.45
        150 (15.3, 34) 4.0 (40.8, 580) 1.15 to 1.45
        200 (20.4, 45) 4.0 (40.8, 580) 1.15 to 1.45
    4. Check accumulator (ACC) pressure sensor
      1. Move the shift lever to the P position. Apply the parking brake and connect the intelligent tester to the DLC3.
      2. Turn the engine switch on (IG).
      3. Turn on the intelligent tester. Select and enter the accumulator (ACC) pressure sensor 1 ("ACC PRESS SENS") into the date monitor.
      4. Temporarily operate the pump motor by depressing the brake pedal 4 or 5 times.
      5. After confirming that the pump motor stops, check the pressure output voltage.

        Standard Voltage: 

        2.6 to 3.8 V 

        If incorrect, troubleshoot the brake system. (See PROBLEM SYMPTOMS TABLE  )

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