Electronically Controlled Brake (Diagnostics - Introduction): Diagnosis Lexus HS I

HOW TO PROCEED WITH TROUBLESHOOTING

HINT

*: Use the Techstream.

1. VEHICLE BROUGHT TO WORKSHOP NEXT: Go to next step
2. CUSTOMER PROBLEM ANALYSIS Interview the customer and confirm the problem. Refer to «HOW TO PROCEED WITH TROUBLESHOOTING»(ref-398089-S18270818032011051600000) . NEXT: Go to next step
3. CHECK DTC AND FREEZE FRAME DATA* Check and record DTCs and Freeze Frame Data. Clear the DTCs and Freeze Frame Data. Refer to «DTC CHECK / CLEAR»(ref-398097-S18517405762011051600000) for DTC Check/Clear, and. Refer to «FREEZE FRAME DATA»(ref-398097-S09838681902011051600000) for Freeze Frame Data). Reconfirm the DTCs. Reconfirm the DTCs based on the recorded DTCs and Freeze Frame Data. Refer to «DTC CHECK / CLEAR»(ref-398097-S18517405762011051600000) for DTC Check/Clear, and. Refer to «FREEZE FRAME DATA»(ref-398097-S09838681902011051600000) for Freeze Frame Data). HINT: When DTCs indicating CAN communication system malfunctions are output, repair the CAN communication system before repairing each corresponding sensor. Refer to «HOW TO PROCEED WITH TROUBLESHOOTING»(ref-398235-S17886579092011051600000) . If any of DTCs U0123/62, U0124/95, U0126/63, and U0293/59 is output together with a CAN communication DTC, first check the appropriate sensor for a momentary open circuit. Refer to «CHECK FOR INTERMITTENT PROBLEMS»(ref-398097-S38565635072011051600000) . If the Techstream cannot communicate with the skid control ECU, inspect the CAN communication system. Refer to «HOW TO PROCEED WITH TROUBLESHOOTING»(ref-398235-S17886579092011051600000) . If there is no response from the skid control ECU, inspect the IG1 circuit of the skid control ECU. Refer to «DTC C1241/41: Low Battery Positive Voltage; DTC C1242/42: Open in IG1 / IG2 Power Source Circuit»(ref-398289-S20904523312011051600000) . Result Result Proceed to DTC is output A DTC is not output (Problem symptom does not occur) B DTC is not output (Problem symptom occurs) C B --> Go to step 5 C --> Go to step 6 A: Go to next step
4. DIAGNOSTIC TROUBLE CODE CHART Proceed to Diagnostic Trouble Code Chart. Refer to «DIAGNOSTIC TROUBLE CODE CHART»(ref-398097-S01025085302011051600000) . NEXT --> Go to step 7
5. SYMPTOM SIMULATION Proceed to How to Proceed with Troubleshooting. Refer to «HOW TO PROCEED WITH TROUBLESHOOTING»(ref-398089-S18270818032011051600000) . NEXT: Go to next step
6. PROBLEM SYMPTOMS TABLE Proceed to Problem Symptoms Table. Refer to «PROBLEM SYMPTOMS TABLE»(ref-398097-S13184429062011051600000) . NEXT: Go to next step
7. CIRCUIT INSPECTION* NEXT: Go to next step
8. IDENTIFICATION OF PROBLEM NEXT: Go to next step
9. REPAIR OR REPLACEMENT NEXT: Go to next step
10. CONFIRMATION TEST* NEXT --> END

PROBLEM SYMPTOMS TABLE

If there are no DTCs but the problem still occurs, check the circuits for each problem symptom in the order given in the table below and proceed to the relevant troubleshooting page.

Note. When replacing the brake booster with master cylinder (skid control ECU), sensor, etc., make sure that the power switch is turned off, the stop light switch is off, and 2 minutes have elapsed since the driver's door was closed.

HINT

1. Since the hydraulic passage is blocked off by the master cut solenoid during electronically controlled brake system control, there is no kickback (vibration) to the brake pedal, creating a quiet sound even while the ABS is operating.
2. Use the table below to help determine the cause of problem symptoms. If multiple suspected areas are listed, the potential causes of the symptoms are listed in order of probability in the "Suspected Area" column of the table. Check each symptom by checking the suspected areas in the order they are listed. Replace parts as necessary.
3. Inspect the fuses and relays related to this system before inspecting the suspected areas below.

ELECTRONICALLY CONTROLLED BRAKE SYSTEM

Scheme 3

Scheme 4

1. TERMINALS OF ECU TEXT IN ILLUSTRATION *1 Component without harness connected (Skid Control ECU) - - Terminal No. (Symbol) Terminal Description 1 (MRI1) Motor power supply input 1 2 (MRI2) Motor power supply input 2 3 (STP0) Stop light control relay output 4 (TS) Sensor check switch input 5 (FR-) Front speed sensor RH (-) signal input 6 (STP2) Stop light control relay input 7 (RL-) Rear speed sensor LH (-) signal input 8 (CSW) VSC OFF switch input 9 (RR-) Rear speed sensor RH (-) signal input 10 (HZRI) Hazard warning switch input 11 (SP1) Speed sensor signal output 12 (IG2) IG2 power source input 13 (BZ) Skid control buzzer output 14 (BI) +B power source input 15 (BS) Solenoid power supply input 16 (IG1) IG1 power source input 18 (FR+) Front speed sensor RH (+) power supply output 19 (CTY) Courtesy switch input 20 (RL+) Rear speed sensor LH (+) power supply output 22 (RR+) Rear speed sensor RH (+) power supply output 23 (GND6) Skid control ECU ground 6 24 (GND5) Skid control ECU ground 5 25 (GND4) Skid control ECU ground 4 26 (GND3) Skid control ECU ground 3 27 (GND2) Skid control ECU ground 2 28 (GND) Skid control ECU ground 29 (MRO1) Motor power supply output 1 30 (MRO2) Motor power supply output 2 31 (FL+) Front speed sensor LH (+) power supply output 32 (FL-) Front speed sensor LH (-) signal input 33 (STP) Stop light switch input 34 (CA2L) CAN communication line 2 (L) 35 (CA2H) CAN communication line 2 (H) 36 (LBL) Brake fluid level warning switch input 37 (CA1H) CAN communication line 1 (H) 38 (CA1L) CAN communication line 1 (L) 39 (VCSK) Stroke sensor power supply output 40 (SKS2) Stroke sensor signal input 2 41 (SKG) Stroke sensor ground 42 (SKS) Stroke sensor signal input
2. TERMINAL INSPECTION Disconnect the connector and measure the voltage or resistance on the wire harness side. TEXT IN ILLUSTRATION *1 Front view of wire harness connected (to Skid Control ECU) - - HINT: Voltage cannot be measured with the connector connected to the skid control ECU as the connector is watertight. STANDARD Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition A60-1 (MRI1) - Body ground R - Body ground Motor power supply input 1 Always 11 to 14 V A60-2 (MRI2) - Body ground B - Body ground Motor power supply input 2 Always 11 to 14 V A60-3 (STP0) - Body ground G - Body ground Stop light control relay output Always 11 to 14 V A60-6 (STP2) - Body ground W - Body ground Stop light control relay input Stop light switch ON --> OFF (Brake pedal depressed --> released) 11 to 14 V --> Below 1.5 V A60-8 (CSW) - Body ground G - Body ground VSC OFF switch input VSC OFF switch held ON --> OFF (Released) Below 1 ohms --> 10 kohms or higher A60-10 (HZRI) - Body ground W - Body ground Hazard warning switch input Hazard warning switch ON --> OFF Below 1 ohms --> 10 kohms or higher A60-12 (IG2) - Body ground Y - Body ground IG2 power source input Power switch on (IG) 11 to 14 V A60-13 (BZ) - Body ground B - Body ground Skid control buzzer output Power switch on (IG), buzzer not sounding 11 to 14 V A60-14 (BI) - Body ground V - Body ground +B power source input Always 11 to 14 V A60-15 (BS) - Body ground Y - Body ground Solenoid power supply input Always 11 to 14 V A60-16 (IG1) - Body ground Y - Body ground IG1 power source input Power switch on (IG) 11 to 14 V A60-19 (CTY) - Body ground L - Body ground Courtesy switch input Driver door close --> open 11 to 14 V --> Below 1.5 V A60-23 (GND6) - Body ground W-B - Body ground Skid control ECU ground 6 Always Below 1 ohms A60-24 (GND5) - Body ground W-B - Body ground Skid control ECU ground 5 Always Below 1 ohms A60-25 (GND4) - Body ground W-B - Body ground Skid control ECU ground 4 Always Below 1 ohms A60-26 (GND3) - Body ground W-B - Body ground Skid control ECU ground 3 Always Below 1 ohms A60-27 (GND2) - Body ground W-B - Body ground Skid control ECU ground 2 Always Below 1 ohms A60-28 (GND) - Body ground W-B - Body ground Skid control ECU ground Always Below 1 ohms A60-33 (STP) - Body ground LG - Body ground Stop light switch input Stop light switch ON --> OFF (Brake pedal depressed --> released) 11 to 14 V --> Below 1.5 V A60-36 (LBL) - Body ground R - Body ground Brake fluid level warning switch input Brake fluid level warning switch OFF --> ON 1.84 to 2.16 kohms --> Below 1 ohms

DIAGNOSIS SYSTEM

1. DESCRIPTION When troubleshooting a vehicle with the diagnosis system, the only difference from the usual troubleshooting procedure is connecting the Techstream to the vehicle and reading various data output from the vehicle's skid control ECU. The skid control ECU records DTCs when it detects a malfunction in the ECU itself or in its circuits. To check the DTCs, connect the Techstream to the DLC3 on the vehicle. The Techstream enables you to clear the DTCs, activate the various actuators, and check the Freeze Frame Data and Data List. Check the auxiliary battery voltage. Standard Voltage 11 to 14 V If the voltage is below 11 V, recharge the auxiliary battery before proceeding to the next step. Check the DLC3. Refer to «GENERAL INFORMATION»(ref-398089-S21707799022011051600000) .
2. DIAGNOSIS If the skid control ECU detects a malfunction, the ABS warning, brake warning / red (malfunction), brake warning / yellow (minor malfunction) and slip indicator lights will come on in order to warn the driver. The DTCs are simultaneously stored in the memory. The DTCs can be read by connecting SST between terminals TC and CG of the DLC3 and observing the blinking pattern of the ABS warning, brake warning / yellow (minor malfunction) and slip indicator lights, or by connecting the Techstream. Refer to «DTC CHECK / CLEAR»(ref-398097-S18517405762011051600000) . This system has a Test Mode (signal check) function. The DTCs can be read by connecting SST between terminals TS and CG of the DLC3 and observing the blinking pattern of the ABS warning, brake warning / yellow (minor malfunction) and slip indicator lights, or by connecting the Techstream. Refer to «TEST MODE PROCEDURE»(ref-398097-S15603599552011051600000) .
3. WARNING LIGHT AND INDICATOR LIGHT INITIAL CHECK Release the parking brake. NOTE: When releasing the parking brake, push the P position switch (transmission shift main switch) for safety. HINT: When the parking brake is applied or the brake fluid level is low, the brake warning light / red (malfunction) comes on. When the power switch is turned on (IG), check that the ABS warning, brake warning / red (malfunction), brake warning / yellow (minor malfunction), VSC OFF indicator and slip indicator lights come on, and TRAC OFF message is displayed on the multi-information display until the power switch is turned on (READY). HINT: If the warning light and indicator light check result is not normal, proceed to troubleshooting for the ABS warning, brake warning / red (malfunction), brake warning / yellow (minor malfunction) and slip indicator light circuits. If the indicator remains on or does not come on, proceed to troubleshooting for the light circuits listed below. Trouble Area See Procedure ABS warning light circuit (Remains on) Refer to «ABS Warning Light Remains ON»(ref-398289-S22117057412011051600000) ABS warning light circuit (Does not come on) Refer to «ABS Warning Light does not Come ON»(ref-398289-S13560335452011051600000) Brake warning light / red (malfunction) circuit (Remains on) Refer to «Brake Warning Light Remains ON»(ref-398289-S22315712682011051600000) Brake warning light / red (malfunction) circuit (Does not come on) Refer to «Brake Warning Light does not Come ON»(ref-398289-S14738914892011051600000) Brake warning light / yellow (minor malfunction) circuit (Remains on) Refer to «Brake Control Warning Light Remains ON»(ref-398289-S37927015112011051600000) Brake warning light / yellow (minor malfunction) circuit (Does not come on) Refer to «Brake Control Warning Light does not Come ON»(ref-398289-S35785424512011051600000) VSC OFF indicator light circuit (Remains on) Refer to «VSC OFF Indicator Light Remains ON»(ref-398289-S05064946382011051600000) VSC OFF indicator light circuit (Does not come on) Refer to «VSC OFF Indicator Light does not Come ON»(ref-398289-S04656540102011051600000) Multi-information display (TRAC OFF indicator) circuit (Remains on) Refer to «TRAC OFF Indicator Light Remains ON»(ref-398289-S32029888472011051600000) Multi-information display (TRAC OFF indicator) circuit (Does not come on) Refer to «TRAC OFF Indicator Light does not Come ON»(ref-398289-S15479334552011051600000) Slip indicator light circuit (Remains on) Refer to «Slip Indicator Light Remains ON»(ref-398289-S21549699332011051600000) Slip indicator light circuit (Does not come on) Refer to «Slip Indicator Light does not Come ON»(ref-398289-S42520856412011051600000)

Scheme 5

Scheme 6

1. DTC CHECK/CLEAR (When Using the Techstream) Check for DTCs. Connect the Techstream to the DLC3. Turn the power switch on (IG). Turn the Techstream on. Read the DTCs following the prompts on the Techstream screen. Enter the following menus: Chassis / ABS/VSC/TRAC / Trouble Codes. Check the details of the DTCs. Refer to «DIAGNOSTIC TROUBLE CODE CHART»(ref-398097-S01025085302011051600000) . Clear the DTCs. Connect the Techstream to the DLC3. Turn the power switch on (IG). Turn the Techstream on. Operate the Techstream to clear the codes. Enter the following menus: Chassis / ABS/VSC/TRAC / Trouble Codes. According to the display on the Techstream, select the trouble code data display with the clear button.
2. DTC CHECK/CLEAR (When not Using the Techstream) Check for DTCs. Using SST, connect terminals TC and CG of the DLC3. SST: 09843-18040 TEXT IN ILLUSTRATION *1 Front view of DLC3 Turn the power switch on (IG). Observe the blinking pattern of the ABS warning, brake warning / yellow (minor malfunction) and slip indicator lights in order to identify the DTC. HINT: If no code appears, inspect the TC and CG terminal circuit, and ABS warning, brake warning / yellow (minor malfunction) and slip indicator light circuits. Trouble Area See Procedure TC and CG terminal circuit Refer to «TC and CG Terminal Circuit»(ref-398289-S13498526062011051600000) ABS warning light circuit (Remains on) Refer to «ABS Warning Light Remains ON»(ref-398289-S22117057412011051600000) ABS warning light circuit (Does not come on) Refer to «ABS Warning Light does not Come ON»(ref-398289-S13560335452011051600000) Brake warning light / yellow (minor malfunction) circuit (Remains on) Refer to «Brake Control Warning Light Remains ON»(ref-398289-S37927015112011051600000) Brake warning light / yellow (minor malfunction) circuit (Does not come on) Refer to «Brake Control Warning Light does not Come ON»(ref-398289-S35785424512011051600000) Slip indicator light circuit (Remains on) Refer to «Slip Indicator Light Remains ON»(ref-398289-S21549699332011051600000) Slip indicator light circuit (Does not come on) Refer to «Slip Indicator Light does not Come ON»(ref-398289-S42520856412011051600000) Count the number of blinks of the ABS warning, brake warning / yellow (minor malfunction) and slip indicator lights. HINT: How to read DTCs: Diagnostic trouble codes are represented by the number of blinks of a warning light. For example, code 21 would be shown by 2 blinks, a pause of 1.5 seconds, and then 1 blink. If one code is detected: The light repeats the same code after a pause of 4 seconds. If multiple codes are detected: The light outputs one code after another with a 2.5-second pause between each code. When all codes have been output, there is a 4-second pause and then the light begins to output the codes again. Check the details of the DTCs. Refer to «DIAGNOSTIC TROUBLE CODE CHART»(ref-398097-S01025085302011051600000) . After completing the check, disconnect terminals TC and CG of the DLC3 to turn off the display. If 2 or more DTCs are detected at the same time, the DTCs will be displayed in ascending order. Clear the DTCs. Using SST, connect terminals TC and CG of the DLC3. SST: 09843-18040 TEXT IN ILLUSTRATION *1 Front view of DLC3 Turn the power switch on (IG). Clear the DTCs stored in the ECU by depressing the brake pedal 8 times or more within 5 seconds. Check that the warning light indicates a normal system code. Remove SST from the terminals of the DLC3. HINT: The DTCs cannot be cleared by disconnecting the battery terminal or the ECU-IG NO. 2 fuse.
3. END OF DTC CHECK/CLEAR Turn the power switch on (IG). Check that the ABS warning, brake warning / yellow (minor malfunction) and slip indicator lights go off when the power switch is turned on (READY).

DATA LIST / ACTIVE TEST

1. DATA LIST HINT: Using the Techstream to read the Data List allows the values or states of switches, sensors, actuators and other items to be read without removing any parts. This non-intrusive inspection can be very useful because intermittent conditions or signals may be discovered before parts or wiring is disturbed. Reading the Data List information early in troubleshooting is one way to save diagnostic time. NOTE: In the table below, the values listed under "Normal Condition" are reference values. Do not depend solely on these reference values when deciding whether a part is faulty or not. Warm up the engine. Turn the power switch off. Connect the Techstream to the DLC3. Turn the power switch on (IG). Turn the Techstream on. Enter the following menus: Chassis / ABS/VSC/TRAC / Data List. According to the display on the Techstream, read the Data List. ABS/VSC/TRAC Tester Display Measurement Item/Range Normal Condition Diagnostic Note ABS Warning Light ABS warning light / ON or OFF ON: Warning light on OFF: Warning light off - Brake Warning Light Brake warning light / red (malfunction) / ON or OFF ON: Warning light on OFF: Warning light off - ECB* Warning Light Brake warning light / yellow (minor malfunction) / ON or OFF ON: Warning light on OFF: Warning light off - 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 - Reservoir Warning SW Brake fluid level warning switch / ON or OFF ON: Reservoir level low OFF: Reservoir level normal - Main Idle SW Main idle switch / ON or OFF ON: Accelerator pedal released OFF: Accelerator pedal depressed - Shift Lever Position Shift position information / Fail, 1st-6th/B, D/M, P/N or R Actual shift position - Inspection Mode Inspection mode / Other or Inspect Other: Normal mode Inspect: Inspection mode - Regulator Pressure Sensor Output Regulator pressure sensor output / Min.: 0 V, Max.: 5 V When brake pedal released: 0.1 to 0.9 V Reading increases when brake pedal is depressed 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 Voltage of Stroke Sensor Voltage of brake pedal stroke sensor / Min.: -2.5 V, Max.: 2.49 V - - Stroke Sensor2 Brake pedal stroke sensor 2 / Min.: 0 V, Max.: 5 V When brake pedal released: 3.65 to 4.35 V Reading decreases when brake pedal is depressed Voltage of Stroke Sensor2 Voltage of brake pedal stroke sensor 2 / Min.: -2.5 V, Max.: 2.49 V - - 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 Deceleration Sensor Acceleration sensor 1 / Min.: -18.18 m/s 2 , Max.: 18.18 m/s 2 - During deceleration/acceleration: Changes continuously Zero Point of Decele Memorized zero value / Min.: -25.11 m/s 2 , Max.: 24.91 m/s 2 - - Deceleration Sensor2 Acceleration sensor 2 / Min.: -18.18 m/s 2 , Max.: 18.18 m/s 2 - During deceleration/acceleration: Changes continuously Zero Point of Decele2 Memorized zero value / Min.: -25.11 m/s 2 , Max.: 24.91 m/s 2 - - Yaw Rate Sensor Yaw rate sensor 1 / Min.: -128 degrees/s, Max.: 127 degrees/s Vehicle stationary: 0 degrees/s Right turn: -128 to 0 degrees/s Left turn: 0 to 127 degrees/s - Zero Point of Yaw Rate Memorized zero value / Min.: -128 degrees/sec., Max.: 127 degrees/sec. - After completing zero point calibration: 0 degrees/sec. Yaw Rate Sensor2 Yaw rate sensor 2 / Min.: -128 degrees/s, Max.: 127 degrees/s Vehicle stationary: 0 degrees/s Right turn: -128 to 0 degrees/s Left turn: 0 to 127 degrees/s - Zero Point of Yaw Rate2 Memorized zero value / Min.: -128 degrees/s, Max.: 127 degrees/s - After completing zero point calibration: 0 degrees/s Steering Angle Sensor Steering angle sensor / Min.: -3276.8 degrees, Max.: 3276.7 degrees Left turn: Increase Right turn: Decrease - Zero Point of Steering Angle Memorized zero value / Min.: -3276.8 degrees, Max.: 3276.7 degrees - After clearing zero point calibration: 0 degrees 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 Yaw Rate Value Yaw rate value / Min.: -128 degrees/s, Max.: 127 degrees/s - During turning: Changes in proportion with yaw Steering Angle Value Steering angle value / Min.: -3276.8 degrees, Max.: 3276.7 degrees - During steering operation: Changes in proportion with steering wheel rotation Slip Indicator Light Slip indicator light / ON or OFF ON: Indicator light on OFF: Indicator light off - 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 FR Wheel Acceleration Front wheel RH acceleration / Min.: -200.84 m/s 2 , Max.: 199.27 m/s 2 - During deceleration/acceleration: Changes continuously FL Wheel Acceleration Front wheel LH acceleration / Min.: -200.84 m/s 2 , Max.: 199.27 m/s 2 - During deceleration/acceleration: Changes continuously RR Wheel Acceleration Rear wheel RH acceleration / Min.: -200.84 m/s 2 , Max.: 199.27 m/s 2 - During deceleration/acceleration: Changes continuously RL Wheel Acceleration Rear wheel LH acceleration / Min.: -200.84 m/s 2 , Max.: 199.27 m/s 2 - During deceleration/acceleration: Changes continuously Stop Light Relay Output Stop light control relay output / ON or OFF ON: Relay output on OFF: Relay output off - EBS Relay Stop light control relay (Emergency brake signal) / ON or OFF OFF: Relay off - FR Wheel ABS Ctrl Status Front wheel RH ABS control status / ON or OFF ON: During control - FL Wheel ABS Ctrl Status Front wheel LH ABS control status / ON or OFF ON: During control - RR Wheel ABS Ctrl Status Rear wheel RH ABS control status / ON or OFF ON: During control - RL Wheel ABS Ctrl Status Rear wheel LH ABS control status / ON or OFF ON: During control - RR Wheel EBD Ctrl Status Rear wheel RH EBD control status / ON or OFF ON: During control - RL Wheel EBD Ctrl Status Rear wheel LH EBD control status / ON or OFF ON: During control - BA Ctrl Status BA control status / ON or OFF ON: During control - PBA Ctrl Status PBA control status / ON or OFF ON: During control - TRC(TRAC) Ctrl Status TRAC control status / ON or OFF ON: During control - TRC(TRAC) Engine Ctrl Status TRAC engine control status / ON or OFF ON: During control - TRC(TRAC) Brake Ctrl Status TRAC brake control status / ON or OFF ON: During control - FR Wheel VSC Ctrl Status Front wheel RH VSC control status / ON or OFF ON: During control - FL Wheel VSC Ctrl Status Front wheel LH VSC control status / ON or OFF ON: During control - RR Wheel VSC Ctrl Status Rear wheel RH VSC control status / ON or OFF ON: During control - RL Wheel VSC Ctrl Status Rear wheel LH VSC control status / ON or OFF ON: During control - 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 Regenerative Cooperation Regenerative cooperation / ON or OFF ON: Operate OFF: Not operate - FR Regenerative Request FR regenerative request torque / Min.: 0 Nm, Max.: 65536 Nm - Changes according to brake pedal force (When depressing the brake pedal lightly after above 30 km/h (19 mph) or more, avoiding sudden braking.) FR Regenerative Operation FR regenerative operation torque / Min.: 0 Nm, Max.: 65536 Nm - Changes according to brake pedal force (When depressing the brake pedal lightly after above 30 km/h (19 mph) or more, avoiding sudden braking.) 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 - ABS Solenoid (SFRH) Holding solenoid valve (FRH) / ON or OFF ON: Operate OFF: Not operate - ABS Solenoid (SFRR) Reduction solenoid valve (FRR) / ON or OFF ON: Operate OFF: Not operate - ABS Solenoid (SFLH) Holding solenoid valve (FLH) / ON or OFF ON: Operate OFF: Not operate - ABS Solenoid (SFLR) Reduction solenoid valve (FLR) / ON or OFF ON: Operate OFF: Not operate - ABS Solenoid (SRRH) Holding solenoid valve (RRH) / ON or OFF ON: Operate OFF: Not operate - ABS Solenoid (SRRR) Reduction solenoid valve (RRR) / ON or OFF ON: Operate OFF: Not operate - ABS Solenoid (SRLH) Holding solenoid valve (RLH) / ON or OFF ON: Operate OFF: Not operate - ABS Solenoid (SRLR) Reduction solenoid valve (RLR) / ON or OFF ON: Operate OFF: Not operate - ECB* Solenoid (SRC) Regulator cut solenoid valve (SRC) / ON or OFF ON: Operate OFF: Not operate - ECB* Solenoid (SCC) Switching solenoid valve (SCC) / ON or OFF ON: Operate OFF: Not operate - ECB* Solenoid (SMC) Master cut solenoid valve (SMC) / ON or OFF ON: Operate OFF: Not operate - ECB* Solenoid (SSC) Simulator cut solenoid valve (SSC) / ON or OFF ON: Operate OFF: Not operate - Regulator Pressure Sensor Correction Voltage Voltage of regulator pressure sensor / Min.: -2.5 V, Max.: 2.49 V - - FR Speed Open Front speed sensor RH open detection / Error or Normal Error: Momentary interruption Normal: Normal - FL Speed Open Front speed sensor LH open detection / Error or Normal Error: Momentary interruption Normal: Normal - RR Speed Open Rear speed sensor RH open detection / Error or Normal Error: Momentary interruption Normal: Normal - RL Speed Open Rear speed sensor LH open detection / Error or Normal Error: Momentary interruption Normal: Normal - Yaw Rate Open Yaw rate sensor open detection / Error or Normal Error: Momentary interruption Normal: Normal - Deceleration Open Acceleration sensor open detection / Error or Normal Error: Momentary interruption Normal: Normal - Steering Open Steering angle sensor open detection / Error or Normal Error: Momentary interruption Normal: Normal - Master Cylinder Open Regulator pressure sensor open detection / Error or Normal Error: Momentary interruption Normal: Normal - Stroke Open Brake pedal stroke sensor open detection / Error or Normal Error: Momentary interruption Normal: Normal - FR Wheel Cylinder Open Wheel cylinder pressure sensor open detection / Error or Normal Error: Momentary interruption Normal: Normal - Accumulator Open Accumulator pressure sensor open detection / Error or Normal Error: Momentary interruption Normal: Normal - HV Communication Open Hybrid vehicle communication open detection / Error or Normal Error: Momentary interruption Normal: Normal - TRAC/VSC Off Mode TRAC/VSC off mode / Normal, TRC OFF, Unknown or VSC OFF Normal: Normal mode TRC OFF: TRAC off mode Unknown: Unspecified VSC OFF: VSC off mode - Number of DTC Number of DTC / Min.: 0, Max.: 255 - Number of DTC output is displayed 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 Regulator Pressure Sensor Output After Filter Regulator pressure sensor output after filter / Min.: -1 MPa, Max.: 23.99 MPa - - Regulator Pressure Sensor Variation Regulator pressure sensor variation / Min.: -30 MPa/s, Max.: 225 MPa/s - - SLA Solenoid Current Linear solenoid additional valve (SLA) current / Min.: 0 A, Max.: 3 A When brake pedal released: 0 A - SLR Solenoid Current Linear solenoid reduction valve (SLR) current / Min.: 0 A, Max.: 3 A When brake pedal released: 0 A - SSC Solenoid Current Simulator cut solenoid valve (SSC) current / Min.: 0 A, Max.: 3 A When brake pedal released: 0 A - SCC Solenoid Current Switching solenoid valve (SCC) current / Min.: 0 A, Max.: 3 A When brake pedal released: 0 A - SMC Solenoid Current Master cut solenoid valve (SMC) current / Min.: 0 A, Max.: 3 A When brake pedal released: 0 A - SRC Solenoid Current Regulator cut solenoid valve (SRC) current / Min.: 0 A, Max.: 3 A When brake pedal released: 0 A - Hazard Switch History Hazard switch history / Incomplete or Complete Incomplete: Incomplete Complete: Complete - *: Electronically Controlled Brake System
2. ACTIVE TEST HINT: Using the Techstream to perform Active Tests allows relays, VSVs, actuators and other items to be operated without removing any parts to operate without removing any parts. This non-intrusive functional inspection can be very useful because intermittent operation may be discovered before parts or wiring is disturbed. Performing Active Tests early in troubleshooting is one way to save diagnostic time. Data List information can be displayed while performing Active Tests. Warm up the engine. Turn the power switch off. Connect the Techstream to the DLC3. Turn the power switch on (IG). Turn the Techstream on. Enter the following menus: Chassis / ABS/VSC/TRAC / Active Test. According to the display on the Techstream, perform the Active Test. ABS/VSC/TRAC Tester Display Test Part Control Range Diagnostic Note ABS Warning Light ABS warning light Warning light ON/OFF Observe combination meter Brake Warning Light Brake warning light / red (malfunction) Warning light ON/OFF Observe combination meter ECB* Warning Light Brake warning light / yellow (minor malfunction) Warning light ON/OFF Observe combination meter Buzzer Skid control buzzer Buzzer ON/OFF Buzzer can be heard Stop Light Relay Stop light control relay Relay ON/OFF Stop lights come on ECB* Main Relay ABS main relay Relay ON/OFF - ECB* Motor Relay ABS motor relay Relay ON/OFF - ABS Solenoid (SRLR) Reduction solenoid valve (RLR) Solenoid ON/OFF Operation sound of solenoid (clicking sound) can be heard ABS Solenoid (SRLH) Holding solenoid valve (RLH) Solenoid ON/OFF Operation sound of solenoid (clicking sound) can be heard ABS Solenoid (SRRR) Reduction solenoid valve (RRR) Solenoid ON/OFF Operation sound of solenoid (clicking sound) can be heard ABS Solenoid (SRRH) Holding solenoid valve (RRH) Solenoid ON/OFF Operation sound of solenoid (clicking sound) can be heard ABS Solenoid (SFLR) Reduction solenoid valve (FLR) Solenoid ON/OFF Operation sound of solenoid (clicking sound) can be heard ABS Solenoid (SFLH) Holding solenoid valve (FLH) Solenoid ON/OFF Operation sound of solenoid (clicking sound) can be heard ABS Solenoid (SFRR) Reduction solenoid valve (FRR) Solenoid ON/OFF Operation sound of solenoid (clicking sound) can be heard ABS Solenoid (SFRH) Holding solenoid valve (FRH) Solenoid ON/OFF Operation sound of solenoid (clicking sound) can be heard ECB* Control Invalid Electronically controlled brake system control invalid Control invalid ON/OFF Electronically controlled brake system control is disabled (braking with no accumulator assist) Accumulator Zero Down Accumulator zero down activation Activation ON/OFF Brake fluid in the accumulator makes noise Actuator Air Bleeding Pattern Actuator air bleeding pattern activation Activation ON/OFF When accumulator pressure lowers, pump operation creates sound Power Supply Air Bleeding Pattern1 Power supply air bleeding pattern activation 1 Activation ON/OFF When accumulator pressure lowers, pump operation creates sound Power Supply Air Bleeding Pattern2 Power supply air bleeding pattern activation 2 Activation ON/OFF When accumulator pressure lowers, pump operation creates sound TRAC OFF Indicator Light Multi-information display Display ON/OFF Observe combination meter VSC OFF Indicator Light VSC OFF indicator light Indicator light ON/OFF Observe combination meter Slip Indicator Light Slip indicator light Indicator light ON/OFF Observe combination meter EBS Relay Stop light control relay Relay ON/OFF No change ECB* Solenoid (SLR) Valve Close Linear solenoid reduction valve (SLR) Valve close ON/OFF - ECB* Solenoid (SLA) Valve Close Linear solenoid additional valve (SLA) Valve close ON/OFF - Stroke Simulator Cut Valve Pattern Simulator cut solenoid valve (SSC) Pattern activation ON/OFF (Difficult to identify visually) ECB* Solenoid (SRC) Regulator cut solenoid valve (SRC) Solenoid ON/OFF Operation sound of solenoid (clicking sound) can be heard ECB* Solenoid (SMC) Master cut solenoid valve (SMC) Solenoid ON/OFF Operation sound of solenoid (clicking sound) can be heard ECB* Solenoid (SCC) Switching solenoid valve (SCC) Solenoid ON/OFF Operation sound of solenoid (clicking sound) can be heard ECB* Solenoid (SSC) Simulator cut solenoid valve (SSC) Solenoid ON/OFF Operation sound of solenoid (clicking sound) can be heard ECB* Solenoid (SMC/SRC/SCC) Switching solenoid valve (SMC/SRC/SCC) Solenoid ON/OFF Operation sound of solenoid (clicking sound) can be heard *: Electronically Controlled Brake System

DIAGNOSTIC TROUBLE CODE CHART

Note. When replacing the brake booster with master cylinder (skid control ECU), sensor, etc., make sure that the power switch is turned off, the stop light switch is off, and 2 minutes have elapsed since the driver's door was closed.

HINT

1. If no abnormality is found when inspecting parts, inspect the skid control ECU and ground points for poor connections.
2. If a trouble code is displayed during the DTC check, check the circuit indicated by the DTC. For details of each code, refer to the information for the respective "DTC Code" in the DTC chart.
3. When 2 or more DTCs are detected, perform circuit inspections one by one until the problem is identified.
4. Inspect the fuses and relays before inspecting the trouble areas as shown in the table below.

ABS DTC

VSC DTC

ELECTRONICALLY CONTROLLED BRAKE SYSTEM DTC

ABS AND ELECTRONICALLY CONTROLLED BRAKE SYSTEM DTC

*1: Electronically Controlled Brake System DTC

*2: ABS DTC

ABS TEST MODE DTC

VSC TEST MODE DTC

ELECTRONICALLY CONTROLLED BRAKE SYSTEM TEST MODE DTC