丰田雅力士制动防抱死（ABS）系统修理手册（英文版）（可编辑）

丰田雅力士制动防抱死（ABS）系统修理手册（英文版）（可编辑） 丰田雅力士制动防抱死(ABS)系统修理手册(英文版) BC–1 BRAKE CONTROL – ANTI-LOCK BRAKE SYSTEM ANTI-LOCK BRAKE SYSTEM PRECAUTION 1 TROUBLESHOOTING PRECAUTION When there are malfunctions in the contact points of the terminals or installation problems with any parts removal and installation of the suspected problem parts may return the system to its normal condition either entirely or temporarily In order to determine the location of the malfunction be sure to check the conditions from the time the malfunction occurred through data such as DTC and freeze frame data outputs Record this information before disconnecting any connectors and removing or installing any parts Since the anti-lock brake system may be influenced by malfunctions in other systems be sure to check for DTCs in other systems Be sure to remove and install the brake actuator and each sensor with the ignition switch off unless specified in the inspection procedures When removing and installing the brake actuator and each sensor be sure to check that the normal display is output during a test mode inspection and a DTC output inspection after reinstalling all the parts If the DTC of the CAN communication line is output repair the malfunction in the communication line and then troubleshoot the anti-lock brake system Since the CAN communication line has its own length and route it cannot be repaired temporarily with a bypass wire etc BC BC–2 BRAKE CONTROL – ANTI-LOCK BRAKE SYSTEM PARTS LOCATION HATCHBACK SKID CONTROL SENSOR WIRE LH SKID CONTROL SENSOR WIRE RH SKID CONTROL SENSOR RH SKID CONTROL SENSOR ROTOR RH MASTER CYLINDER RESERVOIR -BRAKE FLUID LEVEL WARNING SWITCH FRONT SPEED SENSOR RH SKID CONTROL SENSOR ROTOR LH SKID CONTROL SENSOR LH FRONT SPEED SENSOR LH FRONT SPEED SENSOR ROTOR RH FRONT SPEED SENSOR ROTOR LH BRAKE ACTUATOR BC -SKID CONTROL ECU ENGINE ROOM RB -ABS1VSC1 FUSE -ABS2VSC2 FUSE -AM2 FUSE C117856E04 BC–3 BRAKE CONTROL – ANTI-LOCK BRAKE SYSTEM HATCHBACK COMBINATION METER - ABS WARNING LIGHT - BRAKE WARNING LIGHT STOP LIGHT SWITCH DLC3 MAIN BODY ECU DRIVER SIDE JB - ECU-IG FUSE - AM1 FUSE PARKING BRAKE SWITCH BC C118692E04 BC–4 BRAKE CONTROL – ANTI-LOCK BRAKE SYSTEM SEDAN SKID CONTROL SENSOR WIRE RH SKID CONTROL SENSOR RH SKID CONTROL SKID CONTROL SENSOR ROTOR RH SENSOR WIRE LH MASTER CYLINDER RESERVOIR -BRAKE FLUID LEVEL WARNING SWITCH FRONT SPEED SENSOR RH SKID CONTROL SENSOR ROTOR LH SKID CONTROL SENSOR LH FRONT SPEED SENSOR LH FRONT SPEED SENSOR ROTOR LH BRAKE ACTUATOR -SKID CONTROL ECU ENGINE ROOM RB -ABS1VSC1 FUSE BC FRONT SPEED -ABS2VSC2 FUSE SENSOR ROTOR RH -AM2 FUSE C139617E01 BC–5 BRAKE CONTROL – ANTI-LOCK BRAKE SYSTEM SEDAN COMBINATION METER -ABS WARNING LIGHT -BRAKE WARNING LIGHT STOP LIGHT SWITCH DLC3 PARKING BRAKE SWITCH MAIN BODY ECU DRIVER SIDE JB -ECU IG FUSE BC -AM1 FUSE C139619E01 BC–6 BRAKE CONTROL – ANTI-LOCK BRAKE SYSTEM SYSTEM DIAGRAM Brake Actuator Speed Sensor with each wheel Skid Control ECU Stop Light Switch Motor Relay Solenoid Relay Pump Motor Solenoid BC CAN Communication System C122525E01 BC–7 BRAKE CONTROL – ANTI-LOCK BRAKE SYSTEM Neutral Start Switch ECM TC Switch Power Steering ECU TS Switch Main Body ECU Parking Brake Switch ABS Warning Light BRAKE Warning Light Combination Meter CAN Communication System C125123E02 BC BC–8 BRAKE CONTROL – ANTI-LOCK BRAKE SYSTEM SYSTEM DESCRIPTION 1 SYSTEM DESCRIPTION HINT The skid control ECU forms a single unit with the brake actuator a ABS Anti-lock Brake System The ABS helps prevent the wheels from locking when the brakes are applied firmly or on a slippery surface Brake Actuator Pump Motor Each Speed Each Wheel Sensor Skid Control ECU Cylinder Solenoid Valve ABS Warning Light CAN Communication System Combination Meter Brake Fluid Pressure C115099E02 1 Operation description The skid control ECU detects wheel lock conditions by receiving vehicle speed signals from each speed sensor and sends control signals to the pump motor and solenoid valve to BC prevent the wheels from locking by controlling the brake fluid pressure of each wheel cylinder The ABS warning light comes on when the ABS system malfunctions BC–9 BRAKE CONTROL – ANTI-LOCK BRAKE SYSTEM b EBD Electronic Brake force Distribution The EBD control utilizes the ABS realizing the proper brake force distribution between the front and rear wheels in accordance with the driving conditions and vehicle load In addition when the brakes are applied while cornering it also controls the braking forces of the right and left wheels helping to maintain vehicle stability Brake Actuator Each Speed Each Wheel Sensor Skid Control ECU Solenoid Valve Cylinder BRAKE Warning Light Combination Meter CAN Communication System Brake Fluid Pressure C115100E02 1 Operation description The skid control ECU receives speed signals from each speed sensor to detect the slip conditions of the wheels and sends control signals to the solenoid The solenoid valve controls the brake fluid pressure of each wheel cylinder and divides the control power properly between the front and BC rear wheels and the right and left wheels The BRAKE warning light comes on to indicate malfunctions in the EBD system BC–10 BRAKE CONTROL – ANTI-LOCK BRAKE SYSTEM 2 ABS with EBD OPERATION a Based on the signals received from each of the 4 wheel speed sensors the skid control ECU calculates the speed and deceleration of each wheel and checks the wheel slippage conditions The ECU controls the pressure holding valve and pressure reduction valve in order to adjust the brake fluid pressure of each wheel cylinder in accordance with the slippage conditions 3 FAIL SAFE FUNCTION a When a failure occurs in the ABS system the ABS warning light comes on and its operation is prohibited In addition to this when a failure which disables the EBD operation occurs the brake warning light comes on and its operation is prohibited If control is prohibited due to a malfunction during operation control is disabled gradually to avoid sudden vehicle instability 4 INITIAL CHECK a When the vehicle speed first reaches approximately 4 mph 6 kmh or more after the ignition switch is turned on each solenoid valve and the motor of the brake actuator are sequentially activated to perform electrical checks During the initial check the operating sound of the solenoid valve and motor can be heard from the engine compartment but this does not indicate a malfunction 5 FUNCTION OF COMPONENTS Components Functions Detects the wheel speed and sends a signal to the skid control ECU The front speed sensor semiconductor speed sensor with the integrated bearing and the sensor rotor magnetic sensor rotor are installed on the front axle hub Front speed sensor The magnetic sensor rotor is equipped with north and south poles 48 of each Semiconductor speed sensor magnetic sensor rotor which are evenly spaced around its circumference The magnetic field changes as the magnetic sensor rotor rotates The semiconductor speed sensor detects the change and outputs it as the vehicle speed pulse The skid control sensor semiconductor speed sensor and the sensor rotor Skid control sensor magnetic sensor rotor are installed on the rear axle carrier Semiconductor speed sensor magnetic sensor rotor The skid control sensor has the same structure and functions as the front speed sensor Processes the signals from the sensors to control the ABS Skid control ECU Sends and receives control signals to and from the ECM via CAN BC Housed in brake actuator communication Consists of the master cylinder cut solenoid valve holding solenoid valve pump motor and reservoir and adjusts the brake fluid pressure applied to each wheel Brake actuator cylinder Houses the skid control ECU Supplies power to each solenoid Solenoid relay Housed in the skid control ECU Illuminates to inform the driver that a malfunction in the ABS has occurred ABS warning light Blinks to indicate DTCs that relate to the ABS Illuminates to inform the driver that the parking brake is ON when the system is BRAKE warning light normal and when the brake fluid has decreased Illuminates to inform the driver that a malfunction in the EBD has occurred BC–11 BRAKE CONTROL – ANTI-LOCK BRAKE SYSTEM HOW TO PROCEED WITH TROUBLESHOOTING HINT Use the intelligent tester 1 VEHICLE BROUGHT TO WORKSHOP NEXT 2 CUSTOMER PROBLEM ANALYSIS NEXT 3 DTCS AND FREEZE FRAME DATA CHECK AND CLEARANCE NEXT 4 PROBLEM SYMPTOM CONFIRMATION Result Result Proceed to Symptom does not occur A Symptom occurs B B SYMPTOM SIMULATION A 5 CAN COMMUNICATION SYSTEM CHECK a Check for the output DTC relating to the CAN communication system HINT The ECU of this system is connected to the CAN communication system Therefore before starting troubleshooting be sure to check that there is no trouble BC in the CAN communication system Result Result Proceed to CAN communication system DTC not output A CAN communication system DTC output B B CAN COMMUNICATION SYSTEM A BC–12 BRAKE CONTROL – ANTI-LOCK BRAKE SYSTEM 6 DTC CHECK HINT See page BC-25 Result Result Proceed to DTC output A DTC not output B B PROBLEM SYMPTOM TABLE A 7 DTC CHART HINT See page BC-31 NEXT 8 CIRCUIT INSPECTION HINT When 2 or more DTCs are detected perform circuit inspections one by one until the problem is identified NEXT 9 PROBLEM IDENTIFICATION NEXT 10 REPAIR OR REPLACEMENT NEXT BC 11 CONFIRMATION TEST NEXT END BC–13 BRAKE CONTROL – ANTI-LOCK BRAKE SYSTEM CHECK FOR INTERMITTENT PROBLEMS 1 CHECK FOR INTERMITTENT PROBLEMS HINT A momentary interruption open circuit in the connectors andor wire harness between the sensors and ECUs can be detected by using the ECU data list function of an intelligent tester a Turn the ignition switch off and connect the Intelligent Tester intelligent tester to the DLC3 b Turn the ignition switch on DLC3 CAN VIM C115104E05 c Follow the prompts on the intelligent tester to display the DATA LIST and select areas where a Harness Signal momentary interruption should be monitored HINT OK A momentary interruption open circuit cannot be detected for 3 seconds after the ignition Momentary switch is turned on initial check interruption 1 sec 1 sec 1 sec If the status remains on the ERROR display check for continuity between the ECU and the sensors or between ECUs Intelligent Tester Display The ERROR display on the intelligent tester remains on for 1 second after the harness signal ERROR changes from a momentary interruption open NORMAL circuit to normal condition C106657E02 Measurement Item Item Display Normal Condition Diagnostic Note Range Display FR speed sensor open detection ERROR Momentary interruption FR SPD OPN - ERROR or NORMAL NORMAL Normal FL speed sensor open detection ERROR Momentary interruption FL SPD OPN - ERROR or NORMAL NORMAL Normal RR speed sensor open detection ERROR Momentary interruption BC RR SPD OPN - ERROR or NORMAL NORMAL Normal RL speed sensor open detection ERROR Momentary interruption RL SPD OPN - ERROR or NORMAL NORMAL Normal BC–14 BRAKE CONTROL – ANTI-LOCK BRAKE SYSTEM d While observing the screen gently jiggle the connector or wire harness between the ECU and sensors or between ECUs OK Display does not change HINT The connector andor wire harness have a momentary interruption open circuit if the display changes Repair or replace the connector and wire harness if either of them is faulty F047126 BC BC–15 BRAKE CONTROL – ANTI-LOCK BRAKE SYSTEM TEST MODE PROCEDURE HINT By switching the skid control ECU from normal mode to test mode abnormality detection sensitivity is enhanced and troubleshooting can be conducted efficiently Perform a sensor check in test mode after the speed sensor or sensor rotor has been repaired or replaced If the ignition switch is turned from on to ACC or off during test mode DTCs related to the signal check function will be erased During test mode the skid control ECU stores all DTCs related to the signal check function and the DTCs are erased if normality is confirmed Any remaining DTCs are those indicating abnormalities that were found 1 TEST MODE SIGNAL CHECK PROCEDURE USING INTELLIGENT TESTER a Turn the ignition switch off b Check that the steering wheel is in the straight- ahead position c AT Check that the shift lever is in the P position and apply the parking brake d MT Check that the shift lever is in neutral and apply the parking brake e Connect the intelligent tester to the DLC3 Intelligent Tester f Turn the ignition switch on g Turn the tester on h Switch the skid control ECU to test mode using the intelligent tester Select the following menu items DIAGNOSIS OBDMOBD select vehicle ABS SIGNAL DLC3 CHECK CAN VIM C115104E01 i Check that the ABS warning light blinks as shown in Blinking Pattern in TEST MODE the illustration HINT 012 Seconds 012 Seconds If the ABS warning light does not blink perform ON relevant troubleshooting procedures The relevant troubleshooting procedures are described in the sections listed in the table below OFF Section Title See Page BC ABS Warning Light does not Come ON BC-73 BR03904E22 TS and CG Terminal Circuit BC-84 j Start the engine BC–16 BRAKE CONTROL – ANTI-LOCK BRAKE SYSTEM 2 SPEED SENSOR CHECK USING INTELLIGENT Blinking Pattern in TEST MODE TESTER a Check that the ABS warning light is blinking as 012 Seconds 012 Seconds shown in the illustration ON b Check the speed sensor signal 1 Drive the vehicle straight forward at a speed of 28 mph 45 kmh or more for several seconds 2 Check that the ABS warning light goes off OFF HINT BR03904E22 The sensor check may not be completed if one or more wheels spin or the steering wheel is turned If the speed sensor check is commenced while the steering wheel is turned the ABS warning light may come on after the low speed check is finished The ABS warning light comes on immediately when an abnormality is detected When the speed sensor signal is normal the ABS warning light goes off while the vehicle is driven at 28 mph 45 kmh or more and blinks in the test mode pattern while stationary Do not drive the vehicle at a speed of 50 mph 80 kmh or more after the ABS warning light turns off because test mode DTCs are set again when the vehicle speed exceeds 50 mph 80kmh BC BC–17 BRAKE CONTROL – ANTI-LOCK BRAKE SYSTEM Blinking pattern in speed sensor check Vehicle Speed mph kmh 28 45 3 5 0 0 Time Low Speed Check Middle Speed Check ABS Warning Light ON OFF C115115E01 3 Stop the vehicle 3 END SENSOR CHECK USING INTELLIGENT TESTER a When the sensor check is successfully completed the ABS warning light blinks in the test mode pattern when the vehicle is stopped and goes off when the vehicle is driven NOTICE If the sensor check is not completed the ABS warning light blinks even while the vehicle is