2012 Toyota Prius FourFACTORY OEM SERVICE PROCEDURE

Freeze Frame Data

  1. FREEZE FRAME DATA/INFORMATION 
    1. Whenever an ABS, VSC, electronically controlled brake system DTC is detected, the skid control ECU stores the current vehicle (sensor) state as Freeze Frame Data.
    2. The skid control ECU stores the number of times (maximum: 31) the power switch has been turned from off to on (IG) since the last time the ABS was activated.
    3. For DTCs stored in the skid control ECU, information (INF) codes that are contained in the Freeze Frame Data can be displayed on the Techstream.

      HINT: 

      • However, if the vehicle is stopped or at a low speed (7 km/h (4.3 mph) or less), or if a DTC is detected, the skid control ECU will stop counting the number of times the power switch has been turned from off to on (IG).
      • Freeze Frame Data at the time the ABS operates:

        The skid control ECU stores and updates data whenever the ABS system operates.

        When the ECU stores data at the time a DTC is detected, the data stored during ABS operation is cleared.

      • Freeze Frame Data at the time a DTC is detected:

        When the skid control ECU stores data at the time a DTC is detected, no updates will be performed until the data is cleared.

  2. CHECK FREEZE FRAME DATA AND INFORMATION 
    1. Connect the Techstream to the DLC3.
    2. Turn the power switch on (IG).
    3. Turn the Techstream on.
    4. Enter the following menus: Chassis / ABS/VSC/TRAC / Trouble Codes.
    5. According to the display on the Techstream, select the trouble code data display with Freeze Frame Data.
    6. Read the Freeze Frame Data recorded when the DTC was set.
    7. Read the information.
      1. Select the item that has an information (INF) code from the Freeze Frame Data screen.
        ABS/VSC/TRAC

        Tester Display Measurement Item/Range Normal Condition Diagnostic Note
        Detailed Freeze DTC Detailed code for Freeze Frame DTC / Min.: 0, Max.: 65535 - Number of information (INF) code output is displayed
        Elapsed Time after Freeze Trigger Elapsed time after freeze trigger / Min.: 0 msec, Max.: 500 msec - -
        Number of IG ON Number of operations of power switch on (IG) after storing Freeze Frame Data / 0 to 31 - -
        Elapsed Time Elapsed time after power switch on (IG) / Min.: 0 sec., Max.: 100661.76 sec. - -
        Buzzer Meter buzzer / ON or OFF ON: Buzzer on
        OFF: Buzzer off        		 -
        Stop Light SW Stop light switch / ON or OFF ON: Brake pedal depressed
        OFF: Brake pedal released        		 -
        Parking Brake SW Parking brake switch / ON or OFF ON: Parking brake applied
        OFF: Parking brake released        		 -
        Reservoir Warning SW Brake fluid level warning switch / ON or OFF ON: Reservoir level low
        OFF: Reservoir level normal        		 -
        Shift Lever Position Shift lever position information / Fail, 1st-6th/B, D/M, P/N or R Actual shift lever position -
        Operated System Operated system status / ABS, VSC, TRAC, BA, PB, PBA, HAB, HA-CTRL, Fail, Non or Sys - ABS: ABS activated
        VSC: VSC activated
        TRAC: TRAC activated
        BA: BA activated
        PB: PB activated
        PBA: PBA activated
        HAB: HAB activated
        HA-CTRL: Hill-start assist control activated
        Fail: Fail safe mode activated
        Non: No system activated
        Sys: System prohibited
        Stroke Sensor Brake pedal stroke sensor / Min.: 0 V, Max.: 5 V When brake pedal released: 0.65 to 1.35 V Reading increases when brake pedal is depressed
        Accumulator Sensor Accumulator pressure sensor / Min.: 0 V, Max.: 5 V Specified value: 2.9 to 4.2 V When brake fluid is stored in the accumulator: Accumulator pressure changes in accordance with volume of fluid stored in the accumulator
        Yaw Rate Sensor Yaw rate sensor / Min.: -128 °/s, Max.: 127 °/s Vehicle stopped: 0 °/s
        Turning right: -128 to 0 °/s
        Turning left: 0 to 127 °/s        		 -
        Lateral G Lateral G / Min.: -25.20 m/s2 , Max.: 24.91 m/s2 - During turning: Changes in proportion with acceleration
        Forward and Rearward G Forward and backward G / Min.: -25.11 m/s2 , Max.: 24.91 m/s2 - During acceleration/deceleration: Changes in proportion with acceleration
        FR Wheel Speed Front speed sensor RH / Min.: 0 km/h (0 mph), Max.: 326.4 km/h (202 mph) Vehicle stopped: 0 km/h (0 mph) When driving at constant speed: No large fluctuations
        FL Wheel Speed Front speed sensor LH / Min.: 0 km/h (0 mph), Max.: 326.4 km/h (202 mph) Vehicle stopped: 0 km/h (0 mph) When driving at constant speed: No large fluctuations
        RR Wheel Speed Rear speed sensor RH / Min.: 0 km/h (0 mph), Max.: 326.4 km/h (202 mph) Vehicle stopped: 0 km/h (0 mph) When driving at constant speed: No large fluctuations
        RL Wheel Speed Rear speed sensor LH / Min.: 0 km/h (0 mph), Max.: 326.4 km/h (202 mph) Vehicle stopped: 0 km/h (0 mph) When driving at constant speed: No large fluctuations
        Vehicle Speed Maximum wheel speed sensor / Min.: 0 km/h (0 mph), Max.: 326.4 km/h (202 mph) Vehicle stopped: 0 km/h (0 mph) When driving at constant speed: No large fluctuations
        Accelerator Opening Angle % The difference of a present accelerator / Min.: 0%, Max.: 127% When the accelerator pedal released: 0% During accelerator pedal operation: Changes in proportion with the pedal movement
        ECB* Motor Relay ABS motor relay / ON or OFF ON: Relay on
        OFF: Relay off        		 -
        ECB* Main Relay ABS main relay / ON or OFF ON: Relay on
        OFF: Relay off        		 -
        IG1 Voltage Value IG1 voltage value / Min.: 0 V, Max.: 20 V - Changes in proportion to auxiliary battery voltage
        IG2 Voltage Value IG2 voltage value / Min.: 0 V, Max.: 20 V - Changes in proportion to auxiliary battery voltage
        BS1 Voltage Value BS voltage value / Min.: 0 V, Max.: 20 V - Changes in proportion to auxiliary battery voltage
        VM1 Voltage Value VM1 voltage value / Min.: 0 V, Max.: 20 V - Changes in proportion to auxiliary battery voltage
        Motor Relay Voltage Value Motor relay voltage value / Min.: 0 V, Max.: 20 V During motor operation: 12 V
        No motor operation: 0 V        		 -
        Steering Angle Sensor Steering angle sensor / Min.: - 3276.8 °, Max.: 3276.7 ° Left turn: Increase
        Right turn: Decrease        		 -
        Regulator Pressure Sensor Regulator pressure sensor / Min.: -1 MPa, Max.: 23.99 MPa - -
        Regulator Pressure Sensor Output Variant Regulator pressure sensor output variant / Min.: -30 MPa/s, Max.: 225 MPa/s - -
        Wheel Cylinder Pressure Sensor Wheel cylinder pressure sensor / Min.: 0 V, Max.: 5 V When brake pedal released: 0.1 to 0.9 V Reading increases when brake pedal is depressed
        SLA Solenoid Current Linear solenoid additional valve (SLA) current / Min.: 0 A, Max.: 1.5 A When brake pedal released: 0 A -
        SLR Solenoid Current Linear solenoid reduction valve (SLR) current / Min.: 0 A, Max.: 1.5 A When brake pedal released: 0 A -
        Target Oil Pressure Wheel target hydraulic pressure / Min.: 0 MPa, Max.: 20 MPa Changes according to the target wheel cylinder hydraulic pressure -
        ECB* Solenoid (SSC) Simulator cut solenoid valve (SSC) / ON or OFF ON: Solenoid on
        OFF: Solenoid off        		 -
        ECB* Solenoid (SCC) Switching solenoid valve (SCC) / ON or OFF ON: Solenoid on
        OFF: Solenoid off        		 -
        ECB* Solenoid (SMC) Master cut solenoid valve (SMC) / ON or OFF ON: Solenoid on
        OFF: Solenoid off        		 -
        ECB* Solenoid (SRC) Regulator cut solenoid valve (SRC) / ON or OFF ON: Solenoid on
        OFF: Solenoid off        		 -

        *: Electronically Controlled Brake System

  3. CLEAR FREEZE FRAME DATA AND INFORMATION 
    NOTE:

    Clearing the DTCs will also clear the Freeze Frame Data and information (INF) codes.

    1. Connect the Techstream to the DLC3.
    2. Turn the power switch on (IG).
    3. Turn the Techstream on.
    4. Clear the DTCs and Freeze Frame Data. Refer to DTC CHECK / CLEAR .
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