Vehicle Stability Control System (Diagnostics - Introduction): Other Lexus RX III

PRECAUTION

1. PRECAUTION FOR DISCONNECTING THE CABLE FROM THE NEGATIVE BATTERY NOTE: When disconnecting the cable from the negative (-) battery terminal, initialize the following systems after the cable is reconnected: System See Procedure Parking Assist Monitor System Refer to «INITIALIZATION»(ref-400649-S12881576452011051800000) Side Monitor System (w/ Parking Assist Monitor System) Refer to «INITIALIZATION»(ref-400649-S12881576452011051800000) Back Door Closer System Refer to «INITIALIZATION»(ref-400649-S12881576452011051800000) Power Back Door System Refer to «INITIALIZATION»(ref-400649-S12881576452011051800000)
2. TROUBLESHOOTING PRECAUTIONS When there is a malfunction with terminal contact points or part installation problems, removal and installation of the suspected parts may return the system to the normal condition either completely or temporarily. In order to determine the malfunctioning area, be sure to check the conditions at the time the malfunction occurred, such as DTC output and the Freeze Frame Data, and record them before disconnecting each connector or removing and installing parts. Since the system may be influenced by malfunctions in systems other than the VSC system, be sure to check for DTCs in other systems.
3. HANDLING PRECAUTIONS Do not remove or install VSC parts such as the steering angle sensor or yaw rate and acceleration sensor except when necessary, as they must be calibrated after removal or installation. Be sure to perform preparation before work and confirmation after work is completed by following the directions in the repair service information when working on the VSC system. Be sure to remove and install the ECU, brake actuator and each sensor, etc. with the engine switch off unless it is specified in the inspection procedure. If the ECU, brake actuator or a sensor has been removed and installed, it is necessary to check the system for problems after the parts have been reassembled. Check for DTCs using the Techstream, and also check that system functions and signals received by the ECU are normal using Test Mode.
4. DTC PRECAUTION Warnings for some DTCs will not be cleared by just replacing the defective parts. If a warning is still displayed after completing a repair, turn the engine switch off before beginning the procedure for clearing DTCs. NOTE: If a part is still malfunctioning even after the DTC is cleared, the DTC will be stored again.
5. CHASSIS DYNAMOMETER PRECAUTION When testing with a 2-wheel drum tester such as a speedometer tester, a combination tester for the speedometer and brake, a chassis dynamometer, or when jacking up the front wheels and turning the wheels, perform the following procedure to enter the Inspection Mode and stop the TR(A)C and VSC systems. Enter Inspection Mode to disable TR(A)C and VSC control when using a chassis dynamometer. HINT: The vehicle may move unexpectedly out of the dynamometer because of TR(A)C and VSC operations. NOTE: Secure the vehicle with the lock chain for safety. When performing procedures related to VSC OFF switch operation, make sure that the mode is VSC OFF mode. Activating Inspection Mode (When Using the Techstream) Ensure that the engine switch is off and the engine is stopped. Make sure that the shift lever is in P. Connect the Techstream to the DLC3. Start the engine. Turn the Techstream on. Enter the following menus: Chassis / ABS/VSC/TRAC / Utility / Inspection Mode. Check that the TR(A)C OFF message will be displayed on the multi-information display and VSC OFF indicator light will come on. HINT: If the TR(A)C OFF message will be displayed on the multi-information display and VSC OFF indicator light do not come on, repeat the steps. Turning the engine switch off ends Inspection Mode. Activating Inspection Mode (When not Using the Techstream) HINT: Perform steps "D" to "H" within 30 seconds. Ensure that the engine switch is off and the engine is stopped (Step "A"). Make sure that the shift lever is in P (Step "B"). Start the engine (Step "C"). Apply the parking brake by depressing the parking brake pedal (Step "D"). Depress and release the brake pedal twice (Step "E"). Depress and hold the brake pedal down, then release and apply the parking brake twice (Step "F"). With the parking brake applied, depress and release the brake pedal twice (Step "G"). Check if the TR(A)C OFF message will be displayed on the multi-information display and VSC OFF indicator light will come on (Step "H"). HINT: If the TR(A)C OFF message will be displayed on the multi-information display and VSC OFF indicator light do not come on in step "H", repeat the steps from "A" to "H". Turning the engine switch off ends Inspection Mode.
6. CAN COMMUNICATION SYSTEM PRECAUTIONS The CAN communication system is used for data communication between the skid control ECU, the steering angle sensor, the yaw rate and acceleration sensor and other ECUs. If there are any problems in the CAN communication lines, corresponding DTCs for the communication lines are output. If any CAN communication line DTCs are output, repair the malfunction in the communication lines and troubleshoot the VSC system after data communication becomes normal. In order to enable CAN communication, a specific type of wiring is used for the CAN communication lines. The wiring used for each communication line is a twisted pair of wires that have an equal length. A bypass wire should not be used because the data being transmitted will be corrupted.

1. PRECAUTION FOR DISCONNECTING THE CABLE FROM THE NEGATIVE BATTERY NOTE: When disconnecting the cable from the negative (-) battery terminal, initialize the following systems after the cable is reconnected: System See Procedure Parking Assist Monitor System Refer to «INITIALIZATION»(ref-400649-S34584305262011051800000) Side Monitor System (w/ Parking Assist Monitor System) Refer to «INITIALIZATION»(ref-400649-S34584305262011051800000) Back Door Closer System Refer to «INITIALIZATION»(ref-400649-S34584305262011051800000) Power Back Door System Refer to «INITIALIZATION»(ref-400649-S34584305262011051800000)
2. TROUBLESHOOTING PRECAUTIONS When there is a malfunction with terminal contact points or part installation problems, removal and installation of the suspected parts may return the system to the normal condition either completely or temporarily. In order to determine the malfunctioning area, be sure to check the conditions at the time the malfunction occurred, such as DTC output and the Freeze Frame Data, and record them before disconnecting each connector or removing and installing parts. Since the system may be influenced by malfunctions in systems other than the VSC system, be sure to check for DTCs in other systems.
3. HANDLING PRECAUTIONS Do not remove or install VSC parts such as the steering angle sensor or yaw rate and acceleration sensor except when necessary, as they must be calibrated after removal or installation. Be sure to perform preparation before work and confirmation after work is completed by following the directions in the repair service information when working on the VSC system. Be sure to remove and install the ECU, brake actuator and each sensor, etc. with the engine switch off unless it is specified in the inspection procedure. If the ECU, brake actuator or a sensor has been removed and installed, it is necessary to check the system for problems after the parts have been reassembled. Check for DTCs using the Techstream, and also check that system functions and signals received by the ECU are normal using Test Mode.
4. DTC PRECAUTION Warnings for some DTCs will not be cleared by just replacing the defective parts. If a warning is still displayed after completing a repair, turn the engine switch off before beginning the procedure for clearing DTCs. NOTE: If a part is still malfunctioning even after the DTC is cleared, the DTC will be stored again.
5. CHASSIS DYNAMOMETER PRECAUTION When testing with a 2-wheel drum tester such as a speedometer tester, a combination tester for the speedometer and brake, a chassis dynamometer, or when jacking up the front wheels and turning the wheels, perform the following procedure to enter the Inspection Mode and stop the TR(A)C and VSC systems. Enter Inspection Mode to disable TR(A)C and VSC control when using a chassis dynamometer. HINT: The vehicle may move unexpectedly out of the dynamometer because of TR(A)C and VSC operations. NOTE: Secure the vehicle with the lock chain for safety. When performing procedures related to VSC OFF switch operation, make sure that the mode is VSC OFF mode. Activating Inspection Mode (When Using the Techstream) Ensure that the engine switch is off and the engine is stopped. Make sure that the shift lever is in P. Connect the Techstream to the DLC3. Start the engine. Turn the Techstream on. Enter the following menus: Chassis / ABS/VSC/TRAC / Utility / Inspection Mode. Check that the TR(A)C OFF message will be displayed on the multi-information display and VSC OFF indicator light will come on. HINT: If the TR(A)C OFF message will be displayed on the multi-information display and VSC OFF indicator light do not come on, repeat the steps. Turning the engine switch off ends Inspection Mode. Activating Inspection Mode (When not Using the Techstream) HINT: Perform steps "D" to "H" within 30 seconds. Ensure that the engine switch is off and the engine is stopped (Step "A"). Make sure that the shift lever is in P (Step "B"). Start the engine (Step "C"). Apply the parking brake by depressing the parking brake pedal (Step "D"). Depress and release the brake pedal twice (Step "E"). Depress and hold the brake pedal down, then release and apply the parking brake twice (Step "F"). With the parking brake applied, depress and release the brake pedal twice (Step "G"). Check if the TR(A)C OFF message will be displayed on the multi-information display and VSC OFF indicator light will come on (Step "H"). HINT: If the TR(A)C OFF message will be displayed on the multi-information display and VSC OFF indicator light do not come on in step "H", repeat the steps from "A" to "H". Turning the engine switch off ends Inspection Mode.
6. CAN COMMUNICATION SYSTEM PRECAUTIONS The CAN communication system is used for data communication between the skid control ECU, the steering angle sensor, the yaw rate and acceleration sensor and other ECUs. If there are any problems in the CAN communication lines, corresponding DTCs for the communication lines are output. If any CAN communication line DTCs are output, repair the malfunction in the communication lines and troubleshoot the VSC system after data communication becomes normal. In order to enable CAN communication, a specific type of wiring is used for the CAN communication lines. The wiring used for each communication line is a twisted pair of wires that have an equal length. A bypass wire should not be used because the data being transmitted will be corrupted.

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Scheme 19

FREEZE FRAME DATA

1. FREEZE FRAME DATA Whenever an ABS DTC is detected, the skid control ECU stores the current vehicle (sensor) state as Freeze Frame Data. The skid control ECU stores the number of times (maximum: 31) the engine switch has been turned from off to on (IG) since the last time the ABS was activated. HINT: 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. 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 Connect the Techstream to the DLC3. Turn the engine switch on (IG). Turn the Techstream on. Enter the following menus: Chassis / ABS/VSC/TRAC / Trouble Codes. According to the display on the Techstream, select the trouble code data display with Freeze Frame Data. ABS/VSC/TRAC Tester Display Measurement Item/Range Normal Condition Diagnostic Note Elapsed Time after Freeze Trigger Elapsed time after freeze trigger / Min.: 0 ms, Max.: 500 ms - - Number of IG ON Number of operations of engine switch being turned on (IG) after storing Freeze Frame Data / 0 to 31 - - Buzzer Skid control 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 - Gear Position Gear position information / P/N, R, 1st-8th, FAIL or NOT R Actual gear position - Shift Lever Position Shift lever position information / P/N, R, D/M, 1st-6th/B or FAIL Actual shift lever position - Operated System Operated system status / ABS, VSC, TRC, BA, HAB, PBA, PB, HA-CTRL, FAIL, SYS or NON - ABS: ABS activated VSC: VSC activated TRC: TRAC activated BA: BA activated HAB: HAB activated PBA: PBA activated PB: PB activated HA-CTRL: Hill-start assist control activated FAIL: Fail safe mode activated SYS: System prohibit activated NON: No operation activated Master Cylinder Sensor Master cylinder pressure sensor reading / Min.: 0 V, Max.: 5 V When brake pedal is released: 0.3 to 0.9 V Reading increases when brake pedal is depressed M/C Sensor Grade Master cylinder pressure sensor change / Min.: -30 MPa/s, Max.: 225 MPa/s When brake pedal is released or pedal held at constant position: 0 MPa/s When brake pedal is being operated: Changes in proportion with pedal movement speed Yaw Rate Sensor Yaw rate sensor / Min.: -128 deg/s, Max.: 127 deg/s Vehicle stopped: 0 deg/s Turning right: -128 to 0 deg/s Turning left: 0 to 127 deg/s - Lateral G Lateral G / Min.: -25.11 m/s 2 , Max.: 24.91 m/s 2 - During turning: Changes in proportion with acceleration Forward and Rearward G Forward and backward G / Min.: - 25.11 m/s 2 , Max.: 24.91 m/s 2 - During acceleration/deceleration: Changes in proportion with acceleration FR Wheel Speed Front wheel speed sensor RH reading / 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 wheel speed sensor LH reading / 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 wheel speed sensor RH reading / 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 wheel speed sensor LH reading / 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 reading / 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 Grade Vehicle speed grade / Min.: -25.11 m/s 2 , Max.: 24.91 m/s 2 Vehicle stopped: 0 m/s 2 During driving: Changes in proportion with vehicle acceleration/deceleration Real Engine Torque Real engine torque / Min.: -1024 N*m, Max.: 1023 N*m - - Accelerator Opening Angle % The difference of a present accelerator / Min.: 0%, Max.: 128% When the accelerator pedal is released: 0% During accelerator pedal operation: Changes in proportion with the pedal movement Brake Pedal Load Sensing SW Brake pedal load sensing switch / ON or OFF ON: Brake pedal depressed beyond the specified point OFF: Brake pedal not depressed beyond the specified point - Inspection Mode Inspection mode / OTHER or INSPECT OTHER: Normal mode INSPECT: Inspection mode - Steering Angle Sensor Steering angle sensor / Min.: - 3276.8 deg, Max.: 3276.7 deg Left turn: Increase Right turn: Decrease - TRC/VSC Off Mode TRAC/VSC off mode / NORMAL, TRC OFF or VSC OFF NORMAL: Normal mode TRC OFF: TRAC off mode VSC OFF: VSC off mode
3. CLEAR FREEZE FRAME DATA NOTE: Clearing the DTCs will also clear the Freeze Frame Data. Connect the Techstream to the DLC3. Turn the engine switch on (IG). Clear the DTCs and Freeze Frame Data. Refer to «DTC CHECK / CLEAR»(ref-400653-S16813452302011051800000) .

1. FREEZE FRAME DATA Whenever an ABS DTC is detected, the skid control ECU stores the current vehicle (sensor) state as Freeze Frame Data. The skid control ECU stores the number of times (maximum: 31) the engine switch has been turned from off to on (IG) since the last time the ABS was activated. HINT: 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. 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 Connect the Techstream to the DLC3. Turn the engine switch on (IG). Turn the Techstream on. Enter the following menus: Chassis / ABS/VSC/TRAC / Trouble Codes. According to the display on the Techstream, select the trouble code data display with Freeze Frame Data. ABS/VSC/TRAC Tester Display Measurement Item/Range Normal Condition Diagnostic Note Elapsed Time after Freeze Trigger Elapsed time after freeze trigger / Min.: 0 ms, Max.: 500 ms - - Number of IG ON Number of operations of engine switch being turned on (IG) after storing Freeze Frame Data / 0 to 31 - - Buzzer Skid control 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 - Gear Position Gear position information / P/N, R, 1st-8th, FAIL or NOT R Actual gear position - Shift Lever Position Shift lever position information / P/N, R, D/M, 1st-6th/B or FAIL Actual shift lever position - Operated System Operated system status / ABS, VSC, TRC, BA, HAB, PBA, PB, HA-CTRL, FAIL, SYS or NON - ABS: ABS activated VSC: VSC activated TRC: TRAC activated BA: BA activated HAB: HAB activated PBA: PBA activated PB: PB activated HA-CTRL: Hill-start assist control activated FAIL: Fail safe mode activated SYS: System prohibit activated NON: No operation activated Master Cylinder Sensor Master cylinder pressure sensor reading / Min.: 0 V, Max.: 5 V When brake pedal is released: 0.3 to 0.9 V Reading increases when brake pedal is depressed M/C Sensor Grade Master cylinder pressure sensor change / Min.: -30 MPa/s, Max.: 225 MPa/s When brake pedal is released or pedal held at constant position: 0 MPa/s When brake pedal is being operated: Changes in proportion with pedal movement speed Yaw Rate Sensor Yaw rate sensor / Min.: -128 deg/s, Max.: 127 deg/s Vehicle stopped: 0 deg/s Turning right: -128 to 0 deg/s Turning left: 0 to 127 deg/s - Lateral G Lateral G / Min.: -25.11 m/s 2 , Max.: 24.91 m/s 2 - During turning: Changes in proportion with acceleration Forward and Rearward G Forward and backward G / Min.: - 25.11 m/s 2 , Max.: 24.91 m/s 2 - During acceleration/deceleration: Changes in proportion with acceleration FR Wheel Speed Front wheel speed sensor RH reading / 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 wheel speed sensor LH reading / 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 wheel speed sensor RH reading / 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 wheel speed sensor LH reading / 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 reading / 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 Grade Vehicle speed grade / Min.: -25.11 m/s 2 , Max.: 24.91 m/s 2 Vehicle stopped: 0 m/s 2 During driving: Changes in proportion with vehicle acceleration/deceleration Real Engine Torque Real engine torque / Min.: -1024 N*m, Max.: 1023 N*m - - Accelerator Opening Angle % The difference of a present accelerator / Min.: 0%, Max.: 128% When the accelerator pedal is released: 0% During accelerator pedal operation: Changes in proportion with the pedal movement Brake Pedal Load Sensing SW Brake pedal load sensing switch / ON or OFF ON: Brake pedal depressed beyond the specified point OFF: Brake pedal not depressed beyond the specified point - Inspection Mode Inspection mode / OTHER or INSPECT OTHER: Normal mode INSPECT: Inspection mode - Steering Angle Sensor Steering angle sensor / Min.: - 3276.8 deg, Max.: 3276.7 deg Left turn: Increase Right turn: Decrease - TRC/VSC Off Mode TRAC/VSC off mode / NORMAL, TRC OFF or VSC OFF NORMAL: Normal mode TRC OFF: TRAC off mode VSC OFF: VSC off mode
3. CLEAR FREEZE FRAME DATA NOTE: Clearing the DTCs will also clear the Freeze Frame Data. Connect the Techstream to the DLC3. Turn the engine switch on (IG). Clear the DTCs and Freeze Frame Data. Refer to «DTC CHECK / CLEAR»(ref-400653-S23107378592011051800000) .

FAIL-SAFE CHART

1. FAIL SAFE OPERATION If there is a problem with sensor signals or brake actuator systems, the skid control ECU prohibits power supply to the brake actuator and informs the ECM of VSC system failure. The brake actuator turns off the solenoids and the ECM stops its VSC according to signals from the skid control ECU. The vehicle will operate in a manner similar to a vehicle that is not equipped with ABS, TR(A)C and VSC systems. ABS control will be prohibited, but EBD control will continue to the extent that EBD control is possible. If EBD control is impossible, the brake warning light will come on to warn the driver. Refer to «DIAGNOSIS SYSTEM»(ref-400653-S17656122002011051800000) . If a VSC system component malfunctions before VSC begins, VSC will be prohibited. If a system component malfunctions while VSC is operating, the system will gradually stop operating so as not to trigger a sudden change in vehicle stability. If it is impossible to control the systems, the warning light will come on to inform the driver of system control termination. Refer to «DIAGNOSIS SYSTEM»(ref-400653-S17656122002011051800000) . HINT: For vehicles with the multi-information display, the master warning light will come on and a warning message will be displayed on the multi-information display if any of the EBD system, BA system, or TR(A)C system is malfunctioning or if the ABS control or VSC cannot be performed. ABS, EBD AND BA SYSTEM Malfunctioning Area Control Method ABS system ABS, BA, TR(A)C, VSC control prohibited BA system ABS, BA, TR(A)C, VSC control prohibited EBD system ABS, EBD, BA, TR(A)C, VSC control prohibited HINT: A malfunction in either the ABS or BA system will result in identical operation, with ABS, BA, TR(A)C, VSC system control being prohibited. TR(A)C AND VSC SYSTEM Malfunctioning Area Control Method Engine control system (TR(A)C and VSC systems) Before control: Disables control During control: Uses only the brakes to perform control Brake control system (VSC system) Before control: Disables control During control: Uses only the engine to perform control Brake control system (TR(A)C system) Before control: Disables control During control: Disables control (by gradually stopping control) HINT: The TR(A)C and VSC systems use different systems to prohibit different controls depending on the malfunctioning parts.

1. FAIL SAFE OPERATION If there is a problem with sensor signals or brake actuator systems, the skid control ECU prohibits power supply to the brake actuator and informs the ECM of VSC system failure. The brake actuator turns off the solenoids and the ECM stops its VSC according to signals from the skid control ECU. The vehicle will operate in a manner similar to a vehicle that is not equipped with ABS, TR(A)C and VSC systems. ABS control will be prohibited, but EBD control will continue to the extent that EBD control is possible. If EBD control is impossible, the brake warning light will come on to warn the driver. Refer to «DIAGNOSIS SYSTEM»(ref-400653-S29089802202011051800000) . If a VSC system component malfunctions before VSC begins, VSC will be prohibited. If a system component malfunctions while VSC is operating, the system will gradually stop operating so as not to trigger a sudden change in vehicle stability. If it is impossible to control the systems, the warning light will come on to inform the driver of system control termination. Refer to «DIAGNOSIS SYSTEM»(ref-400653-S29089802202011051800000) . HINT: For vehicles with the multi-information display, the master warning light will come on and a warning message will be displayed on the multi-information display if any of the EBD system, BA system, or TR(A)C system is malfunctioning or if the ABS control or VSC cannot be performed. ABS, EBD AND BA SYSTEM Malfunctioning Area Control Method ABS system ABS, BA, TR(A)C, VSC control prohibited BA system ABS, BA, TR(A)C, VSC control prohibited EBD system ABS, EBD, BA, TR(A)C, VSC control prohibited HINT: A malfunction in either the ABS or BA system will result in identical operation, with ABS, BA, TR(A)C, VSC system control being prohibited. TR(A)C AND VSC SYSTEM Malfunctioning Area Control Method Engine control system (TR(A)C and VSC systems) Before control: Disables control During control: Uses only the brakes to perform control Brake control system (VSC system) Before control: Disables control During control: Uses only the engine to perform control Brake control system (TR(A)C system) Before control: Disables control During control: Disables control (by gradually stopping control) HINT: The TR(A)C and VSC systems use different systems to prohibit different controls depending on the malfunctioning parts.