Brake Control: Overview Toyota Prius II рестайлинг

DESCRIPTION

The speed sensor detects wheel speed and sends the appropriate signals to the ECU. These signals are used to control the ABS control system. The front and rear rotors have 48 serrations, respectively. When the rotors rotate, the magnetic field emitted by the permanent magnet in the speed sensor generates an AC voltage. Since the frequency of this AC voltage changes in direct proportion to the speed of the rotor, the frequency is used by the ECU to detect the speed of each wheel.

DTCs C1271/71 and C1272/72 can be deleted when the speed sensor sends a vehicle speed signal or the. Test Mode ends. DTCs C1271/71 and C1272/72 are output only in the test mode.

Checking Vehicle Speed Signal. Scheme 1

DIAGNOSTIC TROUBLE CODE CHART

HINT

1. DTC C0200/31 is for the right front speed sensor.
2. DTC C0205/32 is for the left front speed sensor.
3. The BRAKE warning light comes on when speed sensor malfunctions are detected in 2 or more wheels.

ABS Speed Sensor Front Wiring Diagram. Scheme 2

Refer to DTC C0200/31 AND C0205/32.

DTCs C1273/73 and C1274/74 can be deleted when the speed sensor sends a vehicle speed signal or the Test Mode ends. DTCs C1273/73 and C1274/74 are output only in the Test Mode.

DTC SPECIFICATION

HINT

1. DTC C0210/33 is for the right rear speed sensor.
2. DTC C0215/34 is for the left rear speed sensor.
3. The BRAKE warning light comes on when speed sensor malfunctions are detected in two or more wheels.

ABS Speed Sensor Rear Wiring Diagram. Scheme 3

When a fluid level drop in the master cylinder reservoir is detected, the signal is input to the skid control ECU. When the DTC for the fluid level drop is memorized, the warning is canceled if the fluid level returns to normal and the other DTCs are not input.

DTC DESCRIPTION

Brake Fluid Level Warning Switch Wiring Diagram. Scheme 4

DTC DESCRIPTION CHART

The yaw rate (deceleration) sensor detects any gravity applied to the vehicle and transmit the signal to the skid control ECU via CAN communication system (vehicle equipped with Enhanced VSC). The deceleration sensor is built into the yaw rate sensor and detects the vehicle condition in the 2 systems (GL1, GL2).

When a malfunction occurs in the communication line with the yaw rate sensor, DTC U0123/62 (yaw rate sensor communication malfunction) and DTC U0124/95 (deceleration sensor communication malfunction) are output.

DTCs C0371/71 and C1279/79 are deleted when the yaw fate and deceleration sensor sends a yaw rate and/or deceleration signal or test mode ends. DTCs C0371/71 and C1279/79 are output only in test mode.

DTC RESULT REFERENCE

Yaw Rate Sensor Wiring Diagram. Scheme 5

Scheme 6

Scheme 7

1. CHECK DTC Clear the DTCs (see «DTC CHECK / CLEAR»(ref-289877-S16387242252008070800000) ). Turn the power switch ON (READY). Check that the trouble code for CAN communication DTCs U0073/94 and U0123/62 are not output. Result DTC RESULT REFERENCE Result Proceed to CAN communication DTCs are not output. A CAN communication DTC U0073 or U0123/62 is output. B Only unfinished zero point calibration DTC C1210/36 or C1336/36 is output. C B: REPAIR CIRCUIT INDICATED BY OUTPUT CODE C: Go to step 5 A: Go to Next Step
2. CHECK SENSOR INSTALLATION (YAW RATE (DECELERATION) SENSOR) Check that the yaw rate (deceleration) sensor has been installed properly. OK: The sensor should be tightened to the specified torque. The sensor should not be tilted. NG: INSTALL YAW RATE SENSOR CORRECTLY OK: Go to Next Step
3. CHECK WIRE HARNESS (YAW RATE SENSOR - BATTERY) Disconnect the Y1 sensor connector. Turn the power switch ON (READY). Measure the voltage of the wire harness side connector. Standard voltage STANDARD VOLTAGE CHART Tester Connection Specified Condition Y1-5 (IG) - Body ground 10 to 14 V NG: REPAIR OR REPLACE HARNESS AND CONNECTOR (Scheme 6): Identifying Y1 Sensor Connector OK: Go to Next Step
4. CHECK WIRE HARNESS (YAW RATE SENSOR - BODY GROUND) Disconnect the Y1 sensor connector. Measure the resistance of the wire harness side connector. Standard resistance STANDARD RESISTANCE REFERENCE CHART Tester Connection Specified Condition Y1-1(GND) - Body ground Below 1 ohms NG: REPAIR OR REPLACE HARNESS AND CONNECTOR (Scheme 7): Identifying Y1 Sensor Connector OK: REPLACE YAW RATE SENSOR
5. PERFORM ZERO POINT CALIBRATION OF YAW RATE SENSOR AND DECELERATION SENSOR Perform the zero point calibration of the yaw rate (deceleration) sensor (see «CALIBRATION»(ref-289877-S30149460362008070800000) ).
6. RECONFIRM DTC Clear the DTCs (see «DTC CHECK / CLEAR»(ref-289877-S16387242252008070800000) ). Turn the power switch ON (READY). Check the same DTCs are recorded (see «DTC CHECK / CLEAR»(ref-289877-S16387242252008070800000) ). Result DTC RESULT REFERENCE CHART Result Proceed to DTC is not output A DTC is output B HINT: This DTC may be memorized due to a malfunction in the connector terminal. B: REPLACE YAW RATE SENSOR A: END

The skid control ECU inputs the steering sensor signal through the CAN communication. When a malfunction occurs in the communication line with the steering sensor, DTC U0126/63 (malfunction in communication with steering angle sensor) is output.

DTC DESCRIPTION CHART

Scheme 8

These codes are memorized when the power source voltage for the skid control ECU drops or the voltage for the ABS NO. 1, ABS NO. 2 relay operation drops.

Codes may be memorized when the voltage of the auxiliary battery temporarily drops.

When the power source voltage is too high, the skid control ECU stops functioning and outputs no DTCs, and the ABS and BRAKE warning light remain on.

HINT

DTC C1256/56 (accumulator low voltage malfunction) may be memorized if the power source voltage drops.

DTC DESCRIPTION

Scheme 9

Scheme 10

Scheme 11

1. CHECK DTC (HYBRID CONTROL SYSTEM) Check that hybrid control system DTCs are output. Result DTC RESULT REFERENCE Result Proceed to DTC is not output A DTC is output B B: REPAIR HYBRID CONTROL SYSTEM A: Go to Next Step
2. CHECK AUXILIARY BATTERY VOLTAGE Check the auxiliary battery voltage. Standard voltage: 10 to 14 V NG: CHARGE OR REPLACE AUXILIARY BATTERY OK: Go to Next Step
3. CHECK BRAKE CONTROL POWER SUPPLY (IG VOLTAGE) Measure the voltage of the connector. Standard voltage VOLTAGE SPECIFICATION CHART Tester Connection Condition Specified Condition B18-5(IG) -Body ground Power switch ON (READY) 10 to 14 V NG: REPLACE BRAKE CONTROL POWER SUPPLY (Scheme 9): Identifying Brake Control Power Supply B18 Connector OK: Go to Next Step
4. CHECK SKID CONTROL ECU Measure the voltage of the connectors. HINT: Measure the voltage from behind the connector with the connector connected to the skid control ECU. Standard voltage VOLTAGE SPECIFICATION CHART Tester Connection Condition Specified Condition S8-7(IG1) - Body ground Power switch ON (READY) 10 to 14 V S10-5 (IG2) - Body ground Power switch ON (READY) 10 to 14V S8-3 (+BI1) - Body ground Always 10 to 14V S9-5 (+BI2) - Body ground Always 10 to 14 V Measure the resistance of the connectors. (Scheme 10): Inspecting Skid Control ECU Connectors Terminal Standard resistance STANDARD RESISTANCE REFERENCE CHART Tester Connection Specified Condition S7-1 (GND) - Body ground Below 1 ohms S8-2 (GND2) - Body ground Below 1 ohms S8-1 (GND3) - Body ground Below 1 ohms S9-2 (GND4) - Body ground Below 1 ohms S9-1 (GND5) - Body ground Below 1 ohms S10-4 (GND6) - Body ground Below 1 ohms NG: REPAIR OR REPLACE HARNESS AND CONNECTOR OK: Go to Next Step
5. CHECK SKID CONTROL ECU (BS1, R1+, SR1, BS2, R2+, SR2 VOLTAGE) Measure the voltage of the connectors. HINT: Measure the voltage from behind the connector with the connector connected to the skid control ECU. Standard voltage VOLTAGE SPECIFICATION CHART Tester Connection Condition Specified Condition S7-2(R1+) - Body ground Power switch ON (READY) 8 to 13 V S10-17(R2+) - Body ground Power switch ON (READY) 8 to 13 V S7-12(SR1) - Body ground Power switch ON (READY) Below 1.5 V S10-15 (SR2) - Body ground Power switch ON (READY) Below 1.5 V S7-3(BS1) - Body ground Power switch ON (READY) 10 to 14V S10-7(BS2) - Body ground Power switch ON (READY) 10 to 14 V (Scheme 11): Identifying Skid Control ECU Result DTC RESULT REFERENCE Result Proceed to All OK A NG(R1+, R2+) B NG(SR1, SR2, BS1, BS2) C B: REPLACE SKID CONTROL ECU C: REPAIR OR REPLACE HARNESS AND CONNECTOR A: Go to Next Step
6. RECONFIRM DTC Clear the DTCs (see «DTC CHECK / CLEAR»(ref-289877-S16387242252008070800000) ), Turn the power switch ON (READY). Check the same DTCs are recorded (see «DTC CHECK / CLEAR»(ref-289877-S16387242252008070800000) ). Result DTC RESULT REFERENCE Result Proceed to DTC is not output A DTC is output B B: REPLACE SKID CONTROL ECU A: END (DTC MAY BE STORED DUE TO TEMPORARY POWER SOURCE VOLTAGE DROP)

The master cylinder pressure sensor and the wheel cylinder pressure sensor are built into the brake actuator, and measure the master cylinder pressure and the wheel cylinder pressure sent to the skid control ECU.

DTC C1281/81 can be detected when the master cylinder pressure sensor sends a master cylinder pressure signal or test mode ends. DTC C1281/81 is output only in test mode.

DTC RESULT REFERENCE

Accumulator Pressure Sensor Malfunction - Wiring Diagram. Scheme 12

The stroke sensor inputs the pedal stroke into the skid control ECU.

DTC DESCRIPTION

Stroke Sensor Malfunction - Wiring Diagram. Scheme 13

The skid control ECU inputs the stop light switch signal and detects braking condition. The skid control ECU has a circuit for open detection inside. The skid control ECU outputs the DTC if it detects an open in the stop light signal input line when the stop light switch is off, or an open in the stop light circuit (GND side).

DTC DESCRIPTION

Stop Light Switch Wiring Diagram (1 Of 2). Scheme 14

Stop Light Switch Wiring Diagram (2 Of 2). Scheme 15

The skid control ECU 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. The skid control ECU usually drives the motor relay 1 (ABS MTR) for Electronically Controlled Brake control, and the motor relay 2 (ABS MTR 2) for ABS control. If either is malfunctioning, the other substitutes.

DTC DESCRIPTION

Brake Actuator And Skid Control ECU - Wiring Diagram. Scheme 16

The accumulator pressure sensor is built into the actuator and detects the accumulator pressure, The skid control ECU turns on the brake control warning light and sounds the skid control buzzer if it senses a decrease in the accumulator pressure.

DESCRIPTION CHART

The skid control ECU communicates with the hybrid control ECU and controls braking force according to the motor's regenerative force.

The skid control ECU sends Enhanced VSC signal to the hybrid control ECU and inputs operating signal from the hybrid control ECU.

The skid control ECU uses CAN communication for communication with the hybrid control ECU. If a communication malfunction is memorized, the skid control ECU prohibits Enhanced VSC operation and a part of Electronically Controlled Brake control by fail-safe function.

C1259/59 is stored if the power switch is ON (READY) with the HV battery service plug disconnected.

CAN COMMUNICATION CHART

HV System Regenerative Malfunction - Wiring Diagram. Scheme 17

HINT

This DTC is output from the skid control ECU when the hybrid control ECU sends a malfunction signal to the skid control ECU.

The skid control ECU outputs this DTC if malfunctions are found in the circuit inside the computer by self-diagnosis.

DTC DESCRIPTION

ABS main relay 1 (ABS NO. 1 relay) supplies power to the changeover solenoid and the linear solenoid. ABS main relay 2 (ABS NO. 2 relay) goes on for approximately 5 seconds after the power switch is turned off and the braking effort signal input is terminated. ABS main relay 2 (ABS NO. 2 relay) supplies electricity and maintains operating condition for the brake system when the power switch is OFF.

DTC RESULT REFERENCE

Each solenoid adjusts pressure which affects each wheel cylinder according to signals from the skid control ECU and controls the vehicle.

The master cut solenoid (SMC 1/2) is closed and blocks the master cylinder pressure from the Electronically Controlled Brake control pressure when the system is normal. The master cut solenoid is open and sends the master cylinder fluid pressure to the non-assisted brake wheel cylinders during the fail-safe due to system malfunction.

STANDARD VOLTAGE CHART

Brake Actuator Assembly And Skid Control ECU - Wiring Diagram (1 Of 2). Scheme 18

Brake Actuator Assembly And Skid Control ECU - Wiring Diagram (2 Of 2). Scheme 19

The stroke simulator solenoid (SCSS) generates pedal reactive effort during Electronically Controlled Brake control. If one of the 4 wheels loses brake booster function, the stroke simulator operation is prohibited.

DTC DESCRIPTION

Brake Master Stroke Simulator Cylinder Wiring Diagram. Scheme 20

The skid control ECU controls braking force according to the hybrid system regenerative braking force and inputs the fluid pressure necessary for operating each wheel cylinder according to the wheel cylinder pressure sensor.

DTCs may be stored if one of the following occurs

1. Brake fluid leaks
2. Wheel cylinder vibrates due to uneven wear of brake disc rotor
3. Foreign matter enters solenoid valve
4. Line pressure drops during air bleeding
5. Disc brake pad is replaced
6. Rotor is replaced

DTC DESCRIPTION

Scheme 21

The skid control ECU stores and corrects the difference in each individual part such as the stroke sensor, actuator solenoids, and stroke simulator solenoid. Perform "initialization of linear solenoid valve and calibration" if these parts are replaced.

The skid control ECU inputs the shift position P signal.

DTC DESCRIPTION CHART

The accumulator (ACC) pressure sensor is built into the brake actuator.

The skid control ECU detects the accumulator pressure from the data sent from the accumulator pressure sensor, and then runs and stops the pump motor by operating the motor relay.

DTCs may be output if the accumulator pressure drops due to frequent braking (this is not a malfunction).

DTC DESCRIPTION CHART

The brake control power supply (capacitor) provides auxiliary power for brake control when the auxiliary battery (12 V) voltage drops.

STANDARD VOLTAGE SPECIFICATION

Scheme 22

Scheme 23

Scheme 24

Scheme 25

Scheme 26

1. INSPECT FUSE (ABS MAIN3) Remove the ABS MAIN3 fuse from the engine room relay block. Measure the resistance of the fuse. Standard resistance: Below 1 ohms NG: CHECK FOR SHORT IN ALL HARNESS AND CONNECTOR CONNECTED TO FUSE AND REPLACE FUSE (Scheme 22): Inspecting Fuse (ABS MAIN3) OK: Go to next step
2. CHECK BRAKE CONTROL POWER SUPPLY (BC VOLTAGE) Measure the voltage of the connector. HINT: Measure the voltage from behind the connector with the connector connected. Standard voltage STANDARD VOLTAGE SPECIFICATION Tester Connection Specified Condition B18-8 (BC) - Body ground 10 to 14 V NG: REPAIR OR REPLACE HARNESS AND CONNECTOR (Scheme 23): Identifying Brake Control Power Supply B18 Connector OK: Go to next step
3. CHECK SKID CONTROL ECU (+BI1, +BI2 VOLTAGE) Measure the voltage of the connectors. HINT: Measure the voltage from behind the connector with the connector connected to the skid control ECU. Standard voltage STANDARD VOLTAGE SPECIFICATION Tester Connection Specified Condition S8-3 (+B11) - Body ground 10 to 14 V S9-5 (+BI2) - Body ground 10 to 14 V (Scheme 24): Checking Skid Control ECU (+BI1, +BI2 Voltage) NG: REPAIR OR REPLACE HARNESS AND CONNECTOR OK: Go to next step
4. CHECK SKID CONTROL ECU (+BO1, +BO2 VOLTAGE) Measure the voltage of the connectors. HINT: Measure the voltage from behind the connector with the connector connected to the skid control ECU. Standard voltage STANDARD VOLTAGE SPECIFICATION Tester Connection Specified Condition S8-5 (+BO1) - Body ground 10 to 14 V S9-4 (+BO2) - Body ground 10 to 14 V NG: REPAIR OR REPLACE HARNESS AND CONNECTOR (Scheme 25): Identifying S8 And S9 Connector Terminal OK: Go to next step
5. CHECK BRAKE CONTROL POWER SUPPLY (OUT, BCTY, OUT2 VOLTAGE) Measure the voltage of the connector. HINT: Measure the voltage from behind the connector with the connector connected. Standard voltage STANDARD VOLTAGE SPECIFICATION Tester Connection Condition Specified Condition B18-1 (OUT) - Body ground Power switch ON (READY) 9 to 13 V B18-2 (BCTY) - Body ground Power switch ON (READY) 9 to 13 V B18-7 (OUT2) - Body ground Power switch ON (READY) 9 to 13 V (Scheme 26): Checking Brake Control Power Supply (OUT1, BCTY, OUT2 Voltage) NG: REPLACE BRAKE CONTROL POWER SUPPLY OK: REPAIR OR REPLACE HARNESS AND CONNECTOR

The brake control power supply assembly (capacitor) provides auxiliary power for brake control when an auxiliary battery (12 V) voltage drops.

The FAIL and ENA line are placed between the skid control ECU and the brake control power supply assembly. Signals indicating that the brake control power supply is in auxiliary mode are sent to the skid control ECU through the FAIL line.

Charge permit prohibition signals are sent to the brake control power supply through the ENA line.

DTC DESCRIPTION

Capacitor Communication Malfunction Wiring Diagram. Scheme 27

HINT

The DTC is stored if a brake-fluid,, internal or other leak is detected due to improper sealing in the actuator.

Internal leakage is suspected if the pump motor operates frequently without braking.

DTC DESCRIPTION

The ABS warning light illuminates to inform the driver that there is a problem in the ABS.

When DTC output is normal and the ABS warning light remains on, perform troubleshooting as indicated below.

ABS Warning Light Wiring Diagram (1 Of 2). Scheme 28

ABS Warning Light Wiring Diagram (2 Of 2). Scheme 29

The VSC warning light illuminates to inform the driver that there is a problem in the Enhanced VSC. When DTC output is normal and the VSC warning light remains on, perform troubleshooting as indicated below.

VSC Warning Light Wiring Diagram (1 Of 2). Scheme 30

The BRAKE warning light comes on when the brake fluid is insufficient or the parking brake is applied. The skid control ECU is connected to the combination meter via the CAN and multiplex communications. When the DTC is normal and BRAKE warning light remains on, perform troubleshooting as indicated below.

Brake Warning Light Wiring Diagram (2 Of 2). Scheme 31

The skid control ECU is connected to the combination meter via the CAN and multiplex communications. The brake control warning light illuminates to inform the driver that there is a problem in the Electronically Controlled Brake, or a problem in the brake system that has no influence on driving.

The SLIP indicator blinks during Enhanced VSC operation.

The skid control ECU is connected to the combination meter via the CAN and multiplex communications.

The skid control buzzer sounds and VSC warning light comes ON during Enhanced VSC operation.

Skid Control Buzzer Circuit - Wiring Diagram. Scheme 32

Connecting terminals TC and CG of the DLC3 causes the ECU to display DTCs by flashing the ABS warning light.

Scheme 33

TC And CG Terminal Circuit - Wiring Diagram. Scheme 34

In the sensor check mode, a malfunction of the speed sensor that cannot be detected when the vehicle is stopped is detected while driving.

Transition to the sensor check mode can be performed by connecting terminals TS and CG of the DLC3 and turning the power switch from OFF to ON (READY).

TS And CG Terminal Circuit - Wiring Diagram. Scheme 35

See also:
• DTC CHECK/CLEAR
• REMOVAL