Electronically Controlled Brake System (Diagnostics - Introduction): Diagnosis Lexus GS IV

HOW TO PROCEED WITH TROUBLESHOOTING [03/2012 - ]

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 [03/2012 - ]»(ref-600412-S12576599882014022400000) . 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 [03/2012 - ]»(ref-600441-S41685570292014022400000) for DTC Check/Clear, and. Refer to «FREEZE FRAME DATA [03/2012 - ]»(ref-600441-S23556123262014022400000) for Freeze Frame Data). Reconfirm the DTCs. Reconfirm the DTCs based on the recorded DTCs and Freeze Frame Data. Refer to «DTC CHECK / CLEAR [03/2012 - ]»(ref-600441-S41685570292014022400000) for DTC Check/Clear, and. Refer to «FREEZE FRAME DATA [03/2012 - ]»(ref-600441-S23556123262014022400000) 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 [03/2012 - ]»(ref-600588-S38298476802014022400000) . 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 [03/2012 - ]»(ref-600441-S26759275802014022400000) . If the Techstream cannot communicate with the skid control ECU assembly, inspect the CAN communication system. Refer to «HOW TO PROCEED WITH TROUBLESHOOTING [03/2012 - ]»(ref-600588-S38298476802014022400000) . If there is no response from the skid control ECU assembly, inspect the IG circuit of the skid control ECU assembly. Refer to «DTC C1241/41: Low Battery Positive Voltage; DTC C1242/42: Open in IG1 / IG2 Power Source Circuit»(ref-600627-S26158386552014022400000) . 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 [03/2012 - ]»(ref-600441-S14604054422014022400000) . NEXT --> Go to step 7
5. SYMPTOM SIMULATION Proceed to How to Proceed with Troubleshooting. Refer to «HOW TO PROCEED WITH TROUBLESHOOTING [03/2012 - ]»(ref-600412-S12576599882014022400000) . NEXT: Go to next step
6. PROBLEM SYMPTOMS TABLE Proceed to Problem Symptoms Table. Refer to «PROBLEM SYMPTOMS TABLE [03/2012 - ]»(ref-600441-S24114725172014022400000) . 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 [03/2012 - ]

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 .

Note. When replacing the skid control ECU assembly, 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 2

Scheme 3

1. SKID CONTROL ECU ASSEMBLY TEXT IN ILLUSTRATION *a Component without harness connected (Skid Control ECU Assembly) - - Terminal No. (Symbol) Terminal Description A15-1 (SKS2) Brake pedal stroke sensor 2 signal input A15-2 - (Not used) A15-3 (SKS) Brake pedal stroke sensor 1 signal input A15-4 (SKG) Brake pedal stroke sensor ground A15-5 (VCSK) Brake pedal stroke sensor power supply output A16-1 (GND4) Skid control ECU assembly ground 4 A16-2 - (Not used) A16-3 (FLR-) Front reduction solenoid LH (-) output A16-4 (FLR+) Front reduction solenoid LH (+) output A16-5 No pin A16-6 (SMC2) Master cut solenoid 2 output A16-7 (PCK2) Pressure sensor 2 stuck check output A16-8 (CANL) CAN communication line 3 (Sub bus 15) A16-9 (CANH) CAN communication line 3 (Sub bus 15) A16-10 (RR-) Rear wheel speed sensor RH (-) input A16-11 (RR+) Rear wheel speed sensor RH (+) power supply output A16-12 No pin A16-13 - (Not used) A16-14 (PMC2) Master cylinder pressure sensor 2 signal input A16-15 (FL-) Front wheel speed sensor LH (-) input A16-16 (FL+) Front wheel speed sensor LH (+) power supply output A16-17 (FLA+) Front addition solenoid LH (+) output A16-18 (FLA-) Front addition solenoid LH (-) output A16-19 No pin A16-20 (RRA+) Rear addition solenoid RH (+) output A16-21 (RRA-) Rear addition solenoid RH (-) output A16-22 (+BI4) +B power source 4 A16-23 (HZRI) Brake hold switch input A16-24 - (Not used) A16-25 (STP) Stop light switch input A16-26 No pin A16-27 - (Not used) A16-28 (VCM2) Pressure sensor 2 power supply output A16-29 (CA1L) CAN communication line 1 (V bus) A16-30 (CA1H) CAN communication line 1 (V bus) A16-31 (STPO) Stop light illumination output A16-32 (BS02) Master cut solenoid 2 power supply output A16-33 (RRR-) Rear reduction solenoid RH (-) output A16-34 (RRR+) Rear reduction solenoid RH (+) output A16-35 No pin A16-36 (MR2) ABS motor relay 2 power supply output A16-37 (R2-) ABS motor relay 2 output A16-38 (+BI2) +B power source 2 A16-39 - (Not used) A16-40 (CBI2) Capacitor power supply input 2 A16-41 (FAIL) Capacitor 2 signal input A16-42 No pin A16-43 (PRR) Rear wheel cylinder pressure sensor RH signal input A16-44 (E2) Pressure sensor 2 ground A16-45 (PFL) Front wheel cylinder pressure sensor LH signal input A16-46 (IG2) IG2 power supply A14-1 (GND) Skid control ECU assembly ground A14-2 - (Not used) A14-3 (FRR-) Front reduction solenoid RH (-) output A14-4 (FRR+) Front reduction solenoid RH (+) output A14-5 (SMC1) Master cut solenoid 1 output A14-6 - (Not used) A14-7 - (Not used) A14-8 (ENA) Capacitor signal output A14-9 (PCK1) Pressure sensor 1 stuck check output A14-10 (RL-) Rear wheel speed sensor LH (-) input A14-11 (RL+) Rear wheel speed sensor LH (+) power supply output A14-12 - (Not used) A14-13 - (Not used) A14-14 (PMC1) Master cylinder pressure sensor 1 signal input A14-15 (FR-) Front wheel speed sensor RH (-) input A14-16 (FR+) Front wheel speed sensor RH (+) power supply output A14-17 (FRA+) Front addition solenoid RH (+) output A14-18 (FRA-) Front addition solenoid RH (-) output A14-19 (RLA+) Rear addition solenoid LH (+) output A14-20 (RLA-) Rear addition solenoid LH (-) output A14-21 - (Not used) A14-22 (BZ) Skid control buzzer assembly output A14-23 (SP1) Speedometer signal output A14-24 (STP2) Stop light signal input A14-25 (CTY) Front door courtesy light switch assembly LH signal input A14-26 (PAC1) Accumulator pressure sensor 1 signal input A14-27 (VCM) Pressure sensor 1 power supply output A14-28 (E) Pressure sensor 1 ground A14-29 (+BI3) +B power source 3 A14-30 - (Not used) A14-31 - (Not used) A14-32 (BS01) Master cut solenoid 1 power supply output A14-33 (RLR-) Rear reduction solenoid LH (-) output A14-34 (RLR+) Rear reduction solenoid LH (+) output A14-35 (MR1) ABS motor relay 1 power supply output A14-36 (R1-) ABS motor relay 1 output A14-37 (MTT) ABS motor relay test input A14-38 (CBI1) Capacitor 1 power supply input A14-39 (CSW) VSC OFF switch input A14-40 - (Not used) A14-41 (VBZ) Skid control buzzer assembly power supply output A14-42 (PRL) Rear wheel cylinder pressure sensor LH signal input A14-43 (+BI1) +B power source 1 A14-44 (PFR) Front wheel cylinder pressure sensor RH signal input A14-45 (LBL) Brake fluid level warning switch input A14-46 (IG1) IG1 power source input
2. TERMINAL INSPECTION Disconnect the connector and measure the voltage or resistance on the wire harness side. TEXT IN ILLUSTRATION *a Front view of wire harness connector (to Skid Control ECU Assembly) - - HINT: Voltage cannot be measured with the connector connected to the skid control ECU assembly as the connector is watertight. STANDARD Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition A16-1 (GND4) - Body ground W-B - Body ground Skid control ECU assembly ground 4 Always Below 1 ohms A16-22 (+BI4) - Body ground LG - Body ground +B power source 4 Always 11 to 14 V A16-23 (HZRI) - Body ground SB - Body ground Brake hold switch input Brake hold switch held ON --> OFF (Released) Below 2.5 ohms --> 1Mohms or higher A16-25 (STP) - Body ground R - Body ground Stop light switch input Stop light switch ON --> OFF (Brake pedal depressed --> released) 11 to 14 V --> Below 1.5 V A16-38 (+BI2) - Body ground V - Body ground +B power source 2 Always 11 to 14 V A16-46 (IG2) - Body ground B - Body ground IG2 power source input Power switch on (IG) 11 to 14 V A14-1 (GND) - Body ground W-B - Body ground Skid control ECU assembly ground Always Below 1 ohms A14-24 (STP2) - Body ground W - Body ground Stop light signal input Stop light switch ON --> OFF (Brake pedal depressed --> released) 11 to 14 V --> Below 1.5 V A14-25 (CTY) - Body ground R - Body ground Front door courtesy light switch LH signal input Driver door closed --> open Pulse generation --> Below 1 V A14-29 (+BI3) - Body ground LG - Body ground +B power source 3 Always 11 to 14 V A14-39 (CSW) - Body ground L - Body ground VSC OFF switch input VSC OFF switch held ON --> OFF (Released) Below 1 ohms --> 10 kohms or higher A14-43 (+BI1) - Body ground B - Body ground +B power source 1 Always 11 to 14 V A14-45 (LBL) - Body ground Y - Body ground Brake fluid level warning switch input Brake fluid level warning switch OFF --> ON 1.84 to 2.16 kohms --> Below 1 ohms A14-46 (IG1) - Body ground L - Body ground IG1 power source input Power switch on (IG) 11 to 14 V

DIAGNOSIS SYSTEM [03/2012 - ]

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 assembly. The skid control ECU assembly records DTCs when it detects a malfunction in the ECU assembly 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 [03/2012 - ]»(ref-600412-S13764201052014022400000) .
2. DIAGNOSIS If the skid control ECU assembly 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. Also, when the brake hold switch is turned on, the brake hold operated indicator light blinks. 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), slip indicator and brake hold standby indicator lights, or by connecting the Techstream. Refer to «DTC CHECK / CLEAR [03/2012 - ]»(ref-600441-S41685570292014022400000) . 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 [03/2012 - ]»(ref-600441-S00576269522014022400000) .
3. WARNING LIGHT AND INDICATOR LIGHT INITIAL CHECK When the power switch is turned on (IG), check that the VSC OFF indicator light comes on for approximately 3 seconds, and ABS warning, brake warning / red (malfunction), brake warning / yellow (minor malfunction), slip indicator, brake hold standby indicator and brake hold operated indicator lights remain on 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), VSC OFF indicator, slip indicator, brake hold standby indicator and brake hold operated 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-600627-S09912069362014022400000) ABS warning light circuit (Does not come on) Refer to «ABS Warning Light does not Come ON»(ref-600627-S14314908282014022400000) Brake warning light / red (malfunction) circuit (Remains on) Refer to «Brake Warning Light Remains ON»(ref-600627-S01705240992014022400000) Brake warning light / red (malfunction) circuit (Does not come on) Refer to «Brake Warning Light does not Come ON»(ref-600627-S40908281922014022400000) Brake warning light / yellow (minor malfunction) circuit (Remains on) Refer to «Brake Control Warning Light Remains ON»(ref-600627-S10370357792014022400000) Brake warning light / yellow (minor malfunction) circuit (Does not come on) Refer to «Brake Control Warning Light does not Come ON»(ref-600627-S41583500342014022400000) VSC OFF indicator light circuit (Remains on) Refer to «VSC OFF Indicator Light Remains ON»(ref-600627-S39401096872014022400000) VSC OFF indicator light circuit (Does not come on) Refer to «VSC OFF Indicator Light does not Come ON»(ref-600627-S09718068772014022400000) Slip indicator light circuit (Remains on) Refer to «Slip Indicator Light Remains ON»(ref-600627-S32618008182014022400000) Slip indicator light circuit (Does not come on) Refer to «Slip Indicator Light does not Come ON»(ref-600627-S42299390312014022400000) Brake hold standby indicator light circuit Refer to «Brake Hold Standby Indicator Light Circuit»(ref-600627-S16593538352014022400000) Brake hold operated indicator light circuit Refer to «Brake Hold Operated Indicator Light Circuit»(ref-600627-S41162164642014022400000)

Scheme 4

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 [03/2012 - ]»(ref-600441-S14604054422014022400000) . 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 *a Front view of DLC3 Turn the power switch on (IG). Observe the blinking pattern of the ABS warning, brake warning / yellow (minor malfunction), slip indicator and brake hold standby 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), slip indicator and brake hold standby indicator light circuits. Trouble Area See Procedure TC and CG terminal circuit Refer to «TC and CG Terminal Circuit»(ref-600627-S19357494932014022400000) ABS warning light circuit (Remains on) Refer to «ABS Warning Light Remains ON»(ref-600627-S09912069362014022400000) ABS warning light circuit (Does not come on) Refer to «ABS Warning Light does not Come ON»(ref-600627-S14314908282014022400000) Brake warning light / yellow (minor malfunction) circuit (Remains on) Refer to «Brake Control Warning Light Remains ON»(ref-600627-S10370357792014022400000) Brake warning light / yellow (minor malfunction) circuit (Does not come on) Refer to «Brake Control Warning Light does not Come ON»(ref-600627-S41583500342014022400000) Slip indicator light circuit (Remains on) Refer to «Slip Indicator Light Remains ON»(ref-600627-S32618008182014022400000) Slip indicator light circuit (Does not come on) Refer to «Slip Indicator Light does not Come ON»(ref-600627-S42299390312014022400000) Brake hold standby indicator light circuit Refer to «Brake Hold Standby Indicator Light Circuit»(ref-600627-S16593538352014022400000) Count the number of blinks of the ABS warning, brake warning / yellow (minor malfunction), slip indicator and brake hold standby 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. Before connecting the terminals of the DLC3, if the brake hold operated indicator is blinking, the brake hold operated indicator stops blinking and turns off when terminals TC and CG of the DLC3 are connected. Check the details of the DTCs. Refer to «DIAGNOSTIC TROUBLE CODE CHART [03/2012 - ]»(ref-600441-S14604054422014022400000) . 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 *a 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.
3. END OF DTC CHECK/CLEAR Turn the power switch on (IG). Check that the ABS warning, brake warning / yellow (minor malfunction), slip indicator and brake hold operated indicator lights go off when the power switch is turned on (READY).

DATA LIST / ACTIVE TEST [03/2012 - ]

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 status / ON or OFF ON: Parking brake applied OFF: Parking brake released - TRC(TRAC)/VSC OFF SW VSC OFF switch / ON or OFF ON: Switch on OFF: Switch off - 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 lever position information / Fail, 1st-6th/B, D/M, P, N or R Actual shift lever position - Inspection Mode Inspection mode / Other or Inspect Other: Normal mode Inspect: Inspection mode - Master Cylinder Sensor Master cylinder pressure sensor 1 / Min.: 0.00 V, Max.: 5.00 V When brake pedal released: 0.3 to 0.7 V Reading increases when brake pedal is depressed Voltage of M/C Voltage of master cylinder pressure sensor 1 / Min.: -2.50 V, Max.: 2.49 V - - Master Cylinder Sensor2 Master cylinder pressure sensor 2 / Min.: 0.00 V, Max.: 5.00 V When brake pedal released: 0.3 to 0.7 V Reading increases when brake pedal is depressed Voltage of M/C2 Voltage of master cylinder pressure sensor 2 / Min.: -2.50 V, Max.: 2.49 V - - Stroke Sensor Brake pedal stroke sensor 1 / Min.: 0.00 V, Max.: 5.00 V When brake pedal released: 0.8 to 1.2 V Reading increases when brake pedal is depressed Voltage of Stroke Sensor Voltage of brake pedal stroke sensor 1 / Min.: -2.50 V, Max.: 2.49 V - - Stroke Sensor2 Brake pedal stroke sensor 2 / Min.: 0.00 V, Max.: 5.00 V When brake pedal released: 3.8 to 4.2 V Reading decreases when brake pedal is depressed Voltage of Stroke Sensor2 Voltage of brake pedal stroke sensor 2 / Min.: -2.50 V, Max.: 2.49 V - - Accumulator Sensor Accumulator pressure sensor / Min.: 0.00 V, Max.: 5.00 V Specified value: 2.6 to 3.8 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.: -18.525 m/s 2 , Max.: 18.387 m/s 2 - During deceleration/acceleration: Changes continuously Zero Point of Decele Memorized zero value / Min.: -25.10 m/s 2 , Max.: 24.90 m/s 2 - - Deceleration Sensor2 Acceleration sensor 2 / Min.: -18.525 m/s 2 , Max.: 18.387 m/s 2 - During deceleration/acceleration: Changes continuously Zero Point of Decele2 Memorized zero value / Min.: -25.10 m/s 2 , Max.: 24.90 m/s 2 - - Yaw Rate Sensor Yaw rate sensor 1 / Min.: -128°/s, Max.: 127°/s Vehicle stationary: 0°/s Right turn: -128 to 0°/s Left turn: 0 to 127°/s - Zero Point of Yaw Rate Memorized zero value / Min.: -128°, Max.: 127° - After completing zero point calibration: 0° Yaw Rate Sensor2 Yaw rate sensor 2 / Min.: -128°/s, Max.: 127°/s Vehicle stationary: 0°/s Right turn: -128 to 0°/s Left turn: 0 to 127°/s - Zero Point of Yaw Rate2 Memorized zero value / Min.: -128°/s, Max.: 127°/s - After completing zero point calibration: 0°/s Steering Angle Sensor Steering sensor / Min.: -3276.8°, Max.: 3276.7° Left turn: Increase Right turn: Decrease - Zero Point of Steering Angle Memorized zero value / Min.: -3276.8°, Max.: 3276.7° - After clearing zero point calibration: 0° FR W/C Sensor Front wheel cylinder pressure sensor RH / Min.: 0.00 V, Max.: 5.00 V When brake pedal released: 0.3 to 0.7 V Reading increases when brake pedal is depressed FL W/C Sensor Front wheel cylinder pressure sensor LH / Min.: 0.00 V, Max.: 5.00 V When brake pedal released: 0.3 to 0.7 V Reading increases when brake pedal is depressed RR W/C Sensor Rear wheel cylinder pressure sensor RH / Min.: 0.00 V, Max.: 5.00 V When brake pedal released: 0.3 to 0.7 V Reading increases when brake pedal is depressed RL W/C Sensor Rear wheel cylinder pressure sensor LH / Min.: 0.00 V, Max.: 5.00 V When brake pedal released: 0.3 to 0.7 V Reading increases when brake pedal is depressed Lateral G Lateral G / Min.: -25.10 m/s 2 , Max.: 24.90 m/s 2 - During turning: Changes in proportion with acceleration Forward and Rearward G Forward and backward G / Min.: -25.10 m/s 2 , Max.: 24.90 m/s 2 - During acceleration/deceleration: Changes in proportion with acceleration Yaw Rate Value Yaw rate value / Min.: -128°/s, Max.: 127°/s - During turning: Changes in proportion with yaw rate Steering Angle Value Steering angle value / Min.: -3276.8°, Max.: 3276.7° - During steering operation: Changes in proportion with steering wheel rotation Stop Light Relay No. 2 integration relay / ON or OFF ON: Relay on OFF: Relay off - Slip Indicator Light Slip indicator light / ON or OFF ON: Indicator light on OFF: Indicator light off - FR Wheel Speed Front wheel speed sensor RH / Min.: 0 km/h (0 mph), Max.: 326 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 / Min.: 0 km/h (0 mph), Max.: 326 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 / Min.: 0 km/h (0 mph), Max.: 326 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 / Min.: 0 km/h (0 mph), Max.: 326 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 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 No. 2 integration relay output / ON or OFF ON: Relay output on OFF: Relay output off - EBS Relay No. 2 integration relay (Emergency brake signal) / ON or OFF OFF: Always - FR Wheel ABS Ctrl Status Front wheel RH ABS control status / ON or OFF ON: During the control - FL Wheel ABS Ctrl Status Front wheel LH ABS control status / ON or OFF ON: During the control - RR Wheel ABS Ctrl Status Rear wheel RH ABS control status / ON or OFF ON: During the control - RL Wheel ABS Ctrl Status Rear wheel LH ABS control status / ON or OFF ON: During the control - BA Ctrl Status BA control status / ON or OFF ON: During the control - PBA Ctrl Status PBA control status / ON or OFF ON: During the control - TRC(TRAC) Ctrl Status TRAC control status / ON or OFF ON: During the control - TRC(TRAC) Brake Ctrl Status TRAC brake control status / ON or OFF ON: During the control - FR Wheel VSC Ctrl Status Front wheel RH VSC control status / ON or OFF ON: During the control - FL Wheel VSC Ctrl Status Front wheel LH VSC control status / ON or OFF ON: During the control - RR Wheel VSC Ctrl Status Rear wheel RH VSC control status / ON or OFF ON: During the control - RL Wheel VSC Ctrl Status Rear wheel LH VSC control status / ON or OFF ON: During the control - Accelerator Opening Angle % Accelerator pedal depressed amount / Min.: 0.0%, Max.: 128.0% When the accelerator pedal released: 0% During accelerator pedal operation: Changes in proportion with the pedal movement RR Regenerative Request RR regenerative request torque / Min.: 0 Nm, Max.: 524280 Nm - Changes according to brake pedal force (When depressing the brake pedal lightly at 30 km/h (19 mph) or more while avoiding sudden braking.) RR Regenerative Operation RR regenerative operation torque / Min.: 0 Nm, Max.: 524280 Nm - Changes according to brake pedal force (When depressing the brake pedal lightly at 30 km/h (19 mph) or more while avoiding sudden braking.) Regenerative Cooperation Regenerative cooperation / ON or OFF ON: Operating OFF: Not operating - ECB* Motor Relay ABS motor relay / ON or OFF ON: Relay on OFF: Relay off - ECB* Motor Relay2 ABS motor relay 2 / ON or OFF ON: Relay on OFF: Relay off - ECB* Main Relay ABS main relay / ON or OFF ON: Relay on OFF: Relay off - ECB* Main Relay2 ABS main relay 2 / ON or OFF ON: Relay on OFF: Relay off - ECB* Solenoid (SMC1) Master cut solenoid (SMC1) / ON or OFF ON: Operating OFF: Not operating - ECB* Solenoid (SMC2) Master cut solenoid (SMC2) / ON or OFF ON: Operating OFF: Not operating - SLAFR Solenoid Current Linear solenoid (FRA) current / Min.: 0.00 A, Max.: 3.00 A When brake pedal released: 0 A - SLAFL Solenoid Current Linear solenoid (FLA) current / Min.: 0.00 A, Max.: 3.00 A When brake pedal released: 0 A - SLARR Solenoid Current Linear solenoid (RRA) current / Min.: 0.00 A, Max.: 3.00 A When brake pedal released: 0 A - SLARL Solenoid Current Linear solenoid (RLA) current / Min.: 0.00 A, Max.: 3.00 A When brake pedal released: 0 A - SLRFR Solenoid Current Linear solenoid (FRR) current / Min.: 0.00 A, Max.: 3.00 A When brake pedal released: 0 A - SLRFL Solenoid Current Linear solenoid (FLR) current / Min.: 0.00 A, Max.: 3.00 A When brake pedal released: 0 A - SLRRR Solenoid Current Linear solenoid (RRR) current / Min.: 0.00 A, Max.: 3.00 A When brake pedal released: 0 A - SLRRL Solenoid Current Linear solenoid (RLR) current / Min.: 0.00 A, Max.: 3.00 A When brake pedal released: 0 A - 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 sensor open detection / Error or Normal Error: Momentary interruption Normal: Normal - Master Cylinder Open Master cylinder pressure sensor open detection / Error or Normal Error: Momentary interruption Normal: Normal - Master Cylinder2 Open Master cylinder pressure sensor 2 open detection / Error or Normal Error: Momentary interruption Normal: Normal - Stroke Open Stroke sensor open detection / Error or Normal Error: Momentary interruption Normal: Normal - FR Wheel Cylinder Open Front wheel cylinder pressure sensor RH open detection / Error or Normal Error: Momentary interruption Normal: Normal - FL Wheel Cylinder Open Front wheel cylinder pressure sensor LH open detection / Error or Normal Error: Momentary interruption Normal: Normal - RR Wheel Cylinder Open Rear wheel cylinder pressure sensor RH open detection / Error or Normal Error: Momentary interruption Normal: Normal - RL Wheel Cylinder Open Rear wheel cylinder pressure sensor LH 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 - VGRS Information VGRS information / With, Without or Unknown Without: Without VGRS system - VCM1 Voltage Value VCM voltage value / Min.: 0.00 V, Max.: 10.00 V Specified value: 4.8 to 5.2 V - VCM2 Voltage Value VCM2 voltage value / Min.: 0.00 V, Max.: 10.00 V Specified value: 4.8 to 5.2 V - IG1 Voltage Value IG1 voltage value / Min.: 0.00 V, Max.: 20.00 V - Changes in proportion to auxiliary battery voltage IG2 Voltage Value IG2 voltage value / Min.: 0.00 V, Max.: 20.00 V - Changes in proportion to auxiliary battery voltage BS1 Voltage Value BS1 voltage value / Min.: 0.00 V, Max.: 20.00 V - Changes in proportion to auxiliary battery voltage BS2 Voltage Value BS2 voltage value / Min.: 0.00 V, Max.: 20.00 V - Changes in proportion to auxiliary battery voltage VM1 Voltage Value VM1 voltage value / Min.: 0.00 V, Max.: 20.00 V - Changes in proportion to auxiliary battery voltage VM2 Voltage Value VM2 voltage value / Min.: 0.00 V, Max.: 20.00 V - Changes in proportion to auxiliary battery voltage +B1 Voltage Value +B1 voltage value / Min.: 0.00 V, Max.: 20.00 V - Changes in proportion to auxiliary battery voltage +B2 Voltage Value +B2 voltage value / Min.: 0.00 V, Max.: 20.00 V - Changes in proportion to auxiliary battery voltage MT Voltage Value MT voltage value / Min.: 0.00 V, Max.: 20.00 V - Changes in proportion to auxiliary battery voltage BH Standby Light Brake hold standby indicator light / ON or OFF ON: Indicator light on OFF: Indicator light off - BH Operated Light Brake hold operated indicator light / ON or OFF ON: Indicator light on OFF: Indicator light off - 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 0 Number of DTC output is displayed Hazard Switch History Hazard warning switch history / Incomplete or Complete - - ACC Low Pressure History Trip Counter Number of times power switch turned on (IG) and then off after ACC low pressure condition occurs / Min.: 0, Max.: 255 0 - ACC Low Pressure History Accumulation Counter Total number of times ACC low pressure condition occurs while brake control system not prepared / Min.: 0, Max.: 255 0 - *: 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. 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 No. 2 integration relay Relay ON/OFF Stop lights come on ECB* Main Relay ABS main relay Relay ON/OFF - ECB* Main Relay2 ABS main relay 2 Relay ON/OFF - ECB* Motor Relay ABS motor relay Relay ON/OFF Operation sound of relay (clicking sound) and motor can be heard ECB* Motor Relay2 ABS motor relay 2 Relay ON/OFF Operation sound of relay (clicking sound) and motor can be heard ECB* Solenoid (SMC1) Master cut solenoid (SMC1) Solenoid ON/OFF Operation sound of solenoid (clicking sound) can be heard ECB* Solenoid (SMC2) Master cut solenoid (SMC2) 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 RL Wheel Air Bleeding Pattern Rear wheel LH air bleeding pattern activation Activation ON/OFF When accumulator pressure lowers, pump operation creates sound RR Wheel Air Bleeding Pattern Rear wheel RH air bleeding pattern activation Activation ON/OFF When accumulator pressure lowers, pump operation creates sound Pump Check Pattern Pump check pattern activation Activation ON/OFF When accumulator pressure lowers, pump operation creates sound Drain System Air Bleeding Pattern Drain system air bleeding pattern activation Activation ON/OFF When accumulator pressure lowers, pump operation creates sound ECB* Solenoid (SLRRL) Value Close Linear solenoid (RLR) valve Valve close ON/OFF - ECB* Solenoid (SLARL) Value Close Linear solenoid (RLA) valve Valve close ON/OFF - ECB* Solenoid (SLRRR) Value Close Linear solenoid (RRR) valve Valve close ON/OFF - ECB* Solenoid (SLARR) Value Close Linear solenoid (RRA) valve Valve close ON/OFF - ECB* Solenoid (SLRFL) Value Close Linear solenoid (FLR) valve Valve close ON/OFF - ECB* Solenoid (SLAFL) Value Close Linear solenoid (FLA) valve Valve close ON/OFF - ECB* Solenoid (SLRFR) Value Close Linear solenoid (FRR) valve Valve close ON/OFF - ECB* Solenoid (SLAFR) Value Close Linear solenoid (FRA) valve Valve close ON/OFF - BH Standby Light Brake hold standby indicator light Indicator light ON/OFF Observe combination meter BH Operated Light Brake hold operated indicator light Indicator light ON/OFF Observe combination meter TRC(TRAC) OFF Indicator Light Multi-information display (TRAC OFF indicator) 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 No. 2 integration relay (Emergency brake signal) Relay ON/OFF No change *: Electronically Controlled Brake System

DIAGNOSTIC TROUBLE CODE CHART [03/2012 - ]

Note. When replacing the skid control ECU assembly, 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 assembly 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 "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: ABS DTC

*2: Electronically Controlled Brake System DTC

BRAKE HOLD DTC

ABS TEST MODE DTC

ELECTRONICALLY CONTROLLED BRAKE SYSTEM TEST MODE DTC