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

PRECAUTION [04/2013 - ]

1. PRECAUTION FOR DISCONNECTING CABLE FROM NEGATIVE BATTERY TERMINAL NOTE: When disconnecting the cable from the negative (-) battery terminal, initialize the following system(s) after the cable is reconnected. System See Procedure Variable Gear Ratio Steering System Refer to «INITIALIZATION [04/2013 - ]»(ref-665529-S01115916402014102400000) Air Conditioning System
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 normal 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 Freeze Frame Data, and record it before disconnecting any 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 PRECAUTION Do not remove or install VSC parts such as the steering angle sensor or yaw rate and acceleration sensor except when required, as they need to be adjusted correctly after removal and installation. Be sure to perform preparation before work and confirmation after work is completed by following the directions in the service information when working on the VSC system. Be sure to remove and install the ECU, brake actuator assembly, sensors, etc. with the engine switch off unless it is otherwise specified in the inspection procedure. If the ECU, brake actuator assembly 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. Also check that the system functions and signals received by the ECU are normal using Test Mode.
4. DTC PRECAUTION Warnings for some DTCs cannot be cleared only by repairing the malfunctioning parts. If the warning is displayed after repair work, the DTC should be cleared after turning the engine switch off. NOTE: If a DTC for a malfunctioning part reappears after it was cleared, then it has been stored again. When 2 or more DTCs are detected, perform diagnosis for each DTC, one by one until the problem is identified.
5. CHASSIS DYNAMOMETER PRECAUTION When testing with a 2-wheel drum tester such as a speedometer tester, combination tester for the speedometer and brakes, or chassis dynamometer, or when jacking up the front wheels and turning the wheels, perform the following procedure to enter Inspection Mode and disable the TRAC and VSC systems. NOTE: Secure the vehicle with lock chains for safety. HINT: If Inspection Mode is not used, the vehicle may unexpectedly move off the dynamometer because of TRAC and VSC operation. The VSC OFF switch (combination switch assembly) must not be used to disable TRAC and VSC operation when the vehicle is to be operated on a dynamometer. Pressing the VSC OFF switch (combination switch assembly) does not disable TRAC and VSC operation completely. Activating Inspection Mode (When Using the Techstream) Ensure that the engine switch is off and the engine is stopped. Connect the Techstream to the DLC3. Turn the engine switch on (IG). Turn the Techstream on. Enter the following menus: Chassis / ABS/VSC/TRAC / Utility / Inspection Mode. Chassis > ABS/VSC/TRAC > Utility Tester Display Inspection Mode Check that the VSC OFF indicator light comes on and the TRAC OFF message will be displayed on the multi-information display. HINT: If the VSC OFF indicator light does not come on and the TRAC OFF message is not displayed on the multi-information display, repeat the steps. Turning the engine switch off ends Inspection Mode. Activating Inspection Mode (When not Using the Techstream) HINT: Perform steps "C" to "G" within 30 seconds. Ensure that the engine switch is off and the engine is stopped (Step "A"). Release the parking brake (Step "B"). With the brake pedal depressed, start the engine (Step "C"). While holding the brake pedal down, apply the parking brake (Step "D"). With the parking brake applied, depress and release the brake pedal twice (Step "E"). While holding the brake pedal down, release and apply the parking brake twice (Step "F"). With the parking brake applied, depress and release the brake pedal twice (Step "G"). Check that the VSC OFF indicator light comes on and the TRAC OFF message is displayed on the multi-information display (Step "H"). HINT: If the VSC OFF indicator light does not come on and the TRAC OFF message is not displayed on the multi-information display in step "H", repeat steps "A" to "H". Turning the engine switch off ends Inspection Mode.
6. CAN COMMUNICATION SYSTEM PRECAUTIONS The CAN communication system is used for communication between the skid control ECU (brake actuator assembly), steering angle sensor, yaw rate and acceleration sensor and other ECUs. If there is trouble in a CAN communication line, corresponding DTCs in the communication line are output. If any CAN communication DTCs are output, repair the malfunction, then troubleshoot the VSC system while communication is 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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CAUTION / NOTICE / HINT

HINT

*: Use the Techstream.

PROCEDURE

1. VEHICLE BROUGHT TO WORKSHOP Result Proceed to NEXT Result: 1 NEXT See step 2
2. CUSTOMER PROBLEM ANALYSIS Interview the customer and confirm the problem. Refer to «HOW TO PROCEED WITH TROUBLESHOOTING [04/2013 - ]»(ref-665529-S21853141262014102400000) Result Proceed to NEXT Result: 1 NEXT See step 3
3. CHECK DTC AND FREEZE FRAME DATA* Check and record DTCs and Freeze Frame Data. for DTC Check / Clear: Refer to «DTC CHECK / CLEAR [04/2013 - ]»(ref-665532-S37150082782014102400000) for Freeze Frame Data: Refer to «FREEZE FRAME DATA [04/2013 - ]»(ref-665532-S32780303802014102400000) Chassis > ABS/VSC/TRAC > Trouble Codes Clear the DTCs and Freeze Frame Data. for DTC Check / Clear: Refer to «DTC CHECK / CLEAR [04/2013 - ]»(ref-665532-S37150082782014102400000) for Freeze Frame Data: Refer to «FREEZE FRAME DATA [04/2013 - ]»(ref-665532-S32780303802014102400000) Chassis > ABS/VSC/TRAC > Clear DTCs Reconfirm the DTCs. Reconfirm the DTCs based on the recorded DTCs and Freeze Frame Data. for DTC Check / Clear: Refer to «DTC CHECK / CLEAR [04/2013 - ]»(ref-665532-S37150082782014102400000) for Freeze Frame Data: Refer to «FREEZE FRAME DATA [04/2013 - ]»(ref-665532-S32780303802014102400000) Chassis > ABS/VSC/TRAC > Trouble Codes HINT: When CAN communication system DTCs are output, repair the CAN communication system first. Refer to «HOW TO PROCEED WITH TROUBLESHOOTING [04/2013 - ]»(ref-665785-S15342612202014102400000) If DTC U0100, U0123, U0124 and/or U0126 are among the CAN communication DTCs that are output, first use the Data List to check for a momentary open circuit. Refer to «CHECK FOR INTERMITTENT PROBLEMS [04/2013 - ]»(ref-665532-S02654142972014102400000) If the Techstream cannot communicate with the skid control ECU (brake actuator assembly), inspect the CAN communication system. Refer to «HOW TO PROCEED WITH TROUBLESHOOTING [04/2013 - ]»(ref-665785-S15342612202014102400000) If there is no response from the skid control ECU (brake actuator assembly), inspect the IG1 circuit of the skid control ECU (brake actuator assembly). Refer to «DTC C1241: Low Power Supply Voltage Malfunction [04/2013 - ]»(ref-665825-S03320458712014102400000) Result Result Proceed to DTCs are output. A DTCs are not output. (Problem symptom does not occur.) B DTCs are not output. (Problem symptom occurs.) C Result: 2 B See step 5 Result: 3 C See step 6 Result: 1 A See step 4
4. DIAGNOSTIC TROUBLE CODE CHART Proceed to Diagnostic Trouble Code Chart. Refer to «DIAGNOSTIC TROUBLE CODE CHART [04/2013 - ]»(ref-665532-S42482876212014102400000) Result Proceed to NEXT Result: 1 NEXT See step 7
5. SYMPTOM SIMULATION Proceed to How to Proceed with Troubleshooting. Refer to «CHECK FOR INTERMITTENT PROBLEMS [04/2013 - ]»(ref-665532-S02654142972014102400000) Result Proceed to NEXT Result: 1 NEXT See step 6
6. PROBLEM SYMPTOMS TABLE Proceed to Problem Symptoms Table. Refer to «PROBLEM SYMPTOMS TABLE [04/2013 - ]»(ref-665532-S20301770492014102400000) Result Proceed to NEXT Result: 1 NEXT See step 7
7. CIRCUIT INSPECTION* Result Proceed to NEXT Result: 1 NEXT See step 8
8. IDENTIFICATION OF PROBLEM Result Proceed to NEXT Result: 1 NEXT See step 9
9. REPAIR OR REPLACEMENT Result Proceed to NEXT Result: 1 NEXT See step 10
10. RECONFIRM DTC* Clear the DTCs. Refer to «DTC CHECK / CLEAR [04/2013 - ]»(ref-665532-S37150082782014102400000) Chassis > ABS/VSC/TRAC > Clear DTCs Check if the same DTCs are output. Refer to «DTC CHECK / CLEAR [04/2013 - ]»(ref-665532-S37150082782014102400000) Chassis > ABS/VSC/TRAC > Trouble Codes Result Result Proceed to DTCs are not output. A DTCs are output. B Result: 2 B REPAIR CIRCUITS INDICATED BY OUTPUT DTCS. Refer to «DIAGNOSTIC TROUBLE CODE CHART [04/2013 - ]»(ref-665532-S42482876212014102400000) Result: 1 A See step 11
11. CONFIRMATION TEST* Result Proceed to NEXT Result: 1 NEXT END

CHECK FOR INTERMITTENT PROBLEMS [04/2013 - ]

1. CHECK FOR INTERMITTENT PROBLEMS HINT: A momentary interruption (open circuit) in the connectors and/or wire harness between the sensors and ECUs can be detected using the Data List function of the Techstream. Turn the engine switch off. Connect the Techstream to the DLC3. Turn the engine switch on (IG). Turn the Techstream on. Follow the directions on the Techstream to display the Data List and select areas where momentary interruption should be monitored. HINT: A momentary interruption (open circuit) cannot be detected for 3 seconds after the engine switch is turned on (IG) (initial check). If Error remains displayed for one of the items on the Techstream, check for continuity between the ECU and the item for which Error is displayed. If a momentary interruption occurs and Error is displayed on the Techstream, Error will remain displayed on the Techstream for 1 second after the circuit returns to normal. Chassis > ABS/VSC/TRAC > Data List Tester Display Measurement Item Range Normal Condition Diagnostic Note 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 - EFI Communication Open ECM communication 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 Master cylinder pressure sensor open detection Error or Normal Error: Momentary interruption Normal: Normal - IG Voltage Value Decreased IG1 voltage value decrease detection Error or Normal Error: Voltage low Normal: Normal - IG Voltage Value Increased IG1 voltage value increase detection Error or Normal Error: Voltage high Normal: Normal - FR Speed Sensor Voltage Open Front speed sensor RH voltage open detection Error or Normal Error: Momentary interruption Normal: Normal - FL Speed Sensor Voltage Open Front speed sensor LH voltage open detection Error or Normal Error: Momentary interruption Normal: Normal - RR Speed Sensor Voltage Open Rear speed sensor RH voltage open detection Error or Normal Error: Momentary interruption Normal: Normal - RL Speed Sensor Voltage Open Rear speed sensor LH voltage open detection Error or Normal Error: Momentary interruption Normal: Normal - M/C Pressure Sensor Noise Master cylinder pressure sensor noise detection Error or Normal Error: Malfunction Normal: Normal - Brake Pedal Switch Open Brake pedal load sensing switch open detection Error or Normal Error: Momentary interruption Normal: Normal - Yaw Rate Sensor Voltage Open Yaw rate sensor voltage open detection Error or Normal Error: Momentary interruption Normal: Normal - EFI Communication Invalid ECM communication invalid detection Error or Normal Error: Invalid Normal: Normal - While observing the screen, gently jiggle the connector or wire harness between the ECU and sensors, or between ECUs. OK Normal is displayed. HINT: If the display changes, this indicates that there has been a momentary interruption (open circuit) in the connector and/or wire harness. In this case, repair or replace the connectors and/or wire harnesses as one of them is faulty.

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1. DESCRIPTION After replacing any VSC related components or performing wheel alignment adjustment, clear and read the sensor calibration data and system information. Refer to the table below and then perform the necessary operation according to the part to be replaced in order to perform calibration. Parts to be Replaced / Operation Necessary Operation Skid control ECU (brake actuator assembly) Perform yaw rate and acceleration sensor zero point calibration and store system information. Yaw rate and acceleration sensor Clear zero point calibration data and system information. Perform yaw rate and acceleration sensor zero point calibration and store system information. Wheel alignment adjustment Clear zero point calibration data and system information. Perform yaw rate and acceleration sensor zero point calibration and store system information.
2. PERFORM YAW RATE AND ACCELERATION SENSOR ZERO POINT CALIBRATION AND STORE SYSTEM INFORMATION (When Using Techstream) NOTE: Stored system information cannot be overwritten unless it is cleared. Clear the stored information and then store new system information. While obtaining the zero point, keep the vehicle stationary and do not vibrate, tilt, move, or shake it. Be sure to perform this procedure on a level surface (with an inclination of less than 0.25 degrees). While obtaining the zero point, make sure the tire pressure is as specified and the vehicle is in full contact with the ground (not lifted up or loaded). Clear the zero point calibration data and system information. NOTE: Performing the following procedure will clear the zero points of the yaw rate and acceleration sensor and system information simultaneously. Turn the engine switch off. Check that the steering wheel is centered. Apply the parking brake. Check that the shift lever is in P. Connect the Techstream to the DLC3. Turn the engine switch on (IG). Turn the Techstream on. Select the skid control ECU (brake actuator assembly) to clear the zero point calibration data using the Techstream. Enter the following menus: Chassis / ABS/VSC/TRAC / Utility / Reset Memory. Chassis > ABS/VSC/TRAC > Utility Tester Display Reset Memory Turn the engine switch off. NOTE: If the vehicle is driven after the zero point of the yaw rate and acceleration sensor and system information are cleared, DTCs will be stored. If the engine switch is turned on (IG) for more than 15 seconds with the shift lever in P after the zero point of the yaw rate and acceleration sensor has been cleared, only the zero point of the yaw rate sensor will be stored. If the vehicle is driven under these conditions, the skid control ECU (brake actuator assembly) will store the zero point calibration for the acceleration sensor as not being completed. The skid control ECU (brake actuator assembly) will then also indicate this as a malfunction of the VSC system using the indicator light. Perform the yaw rate and acceleration sensor zero point calibration and store system information. NOTE: Performing the following procedure will perform the yaw rate and acceleration sensor zero points calibration and store system information simultaneously. Turn the engine switch off. Check that the steering wheel is centered. Apply the parking brake. Check that the shift lever is in P. NOTE: DTCs C1210 (Zero Point Calibration of Yaw Rate Sensor Undone) and C1336 (Zero Point Calibration of Acceleration Sensor Undone) will be stored if the shift lever is not in P. If a DTC is stored that indicates zero point calibration is incomplete, repeat the procedure starting at the step for clearing the zero point calibration data and system information. Connect the Techstream to the DLC3. Turn the engine switch on (IG). Turn the Techstream on. Switch the skid control ECU (brake actuator assembly) to Test Mode using the Techstream. Enter the following menus: Chassis / ABS/VSC/TRAC / Utility / Test Mode. Chassis > ABS/VSC/TRAC > Utility Tester Display Test Mode After Test Mode has been entered, keep the vehicle stationary on a level surface for 5 seconds or more. Check that the slip indicator light comes on for several seconds and then blinks in the Test Mode pattern. HINT: If the slip indicator light does not blink, perform zero point calibration again. Zero point calibration is performed only once after the system enters Test Mode. Calibration cannot be performed again until the stored data is cleared. Turn the engine switch off and disconnect the Techstream.
3. PERFORM YAW RATE AND ACCELERATION SENSOR ZERO POINT CALIBRATION AND STORE SYSTEM INFORMATION (When Using SST Check Wire) NOTE: Stored system information cannot be overwritten unless it is cleared. Clear the stored information and then store new system information. While obtaining the zero point, keep the vehicle stationary and do not vibrate, tilt, move, or shake it. Be sure to perform this procedure on a level surface (with an inclination of less than 0.25 degrees). While obtaining the zero point, make sure the tire pressure is as specified and the vehicle is in full contact with the ground (not lifted up or loaded). Clear the zero point calibration data and system information. NOTE: Performing the following procedure will clear the zero points of the yaw rate and acceleration sensor and system information simultaneously. Turn the engine switch off. Check that the steering wheel is centered. Apply the parking brake. Check that the shift lever is in P. Turn the engine switch on (IG). The warning light and indicator light come on for 3 seconds to indicate that the initial check has completed. Using SST, connect and disconnect terminals TS and CG of the DLC3 4 times or more within 8 seconds. *a Front view of DLC3 SST: 09843-18040 Check that the slip indicator light comes on. NOTE: If the vehicle is driven after the zero point of the yaw rate and acceleration sensor and system information are cleared, DTCs will be stored. If the engine switch is turned on (IG) for more than 15 seconds with the shift lever in P after the zero point of the yaw rate and acceleration sensor has been cleared, only the zero point of the yaw rate sensor will be stored. If the vehicle is driven under these conditions, the skid control ECU (brake actuator assembly) will store the zero point calibration for the acceleration sensor as not being completed. The skid control ECU (brake actuator assembly) will then also indicate this as a malfunction of the VSC system using the indicator light. Turn the engine switch off. Perform the yaw rate and acceleration sensor zero point calibration and store system information. NOTE: Performing the following procedure will perform the yaw rate and acceleration sensor zero point calibration, and also store system information simultaneously. Turn the engine switch off. Check that the steering wheel is centered. Apply the parking brake. Check that the shift lever is in P. NOTE: DTCs 36 (Zero Point Calibration of Yaw Rate Sensor Undone) and 98 (Zero Point Calibration of Acceleration Sensor Undone) will be recorded if the shift lever is not in P. If a DTC is stored that indicates zero point calibration is incomplete, repeat the procedure starting at the step for clearing the zero point calibration data and system information. Using SST, connect terminals TS and CG of the DLC3. *a Front view of DLC3 SST: 09843-18040 Turn the engine switch on (IG). After Test Mode has been entered, keep the vehicle stationary on a level surface for 5 seconds or more. Check that the slip indicator light comes on for several seconds and then blinks in the Test Mode pattern. HINT: If the slip indicator light does not blink, perform zero point calibration again. Zero point calibration is performed only once after the system enters Test Mode. Calibration cannot be performed again until the stored data is cleared. Turn the engine switch off and disconnect SST from the DLC3.

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1. WARNING LIGHT AND INDICATOR LIGHT INITIAL CHECK Release the parking brake. NOTE: Before releasing the parking brake, move the shift lever to P. HINT: When the parking brake is applied or the brake fluid level is low, the brake warning light comes on. When the engine switch is turned on (IG), check that the ABS warning, brake warning, VSC OFF indicator and slip indicator lights all come on for approximately 3 seconds. HINT: If the skid control ECU (brake actuator assembly) stores a DTC, the ABS warning and slip indicator lights will come on. If any of the indicators 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 [04/2013 - ]»(ref-665825-S14759331032014102400000) ABS warning light circuit (Does not come on) Refer to «ABS Warning Light does not Come ON [04/2013 - ]»(ref-665825-S29357311052014102400000) Brake warning light circuit (Remains on) Refer to «Brake Warning Light Remains ON [04/2013 - ]»(ref-665825-S32121279752014102400000) Brake warning light circuit (Does not come on) Refer to «Brake Warning Light does not Come ON [04/2013 - ]»(ref-665825-S39015588232014102400000) VSC OFF indicator light circuit (Remains on) Refer to «VSC OFF Switch Circuit [04/2013 - ]»(ref-665825-S05108474672014102400000) VSC OFF indicator light circuit (Does not come on) Refer to «VSC OFF Switch Circuit [04/2013 - ]»(ref-665825-S05108474672014102400000) Slip indicator light circuit (Remains on) Refer to «Slip Indicator Light Remains ON [04/2013 - ]»(ref-665825-S41093571132014102400000) Slip indicator light circuit (Does not come on) Refer to «Slip Indicator Light does not Come ON [04/2013 - ]»(ref-665825-S14786531232014102400000)
2. SENSOR CHECK USING TEST MODE (SIGNAL CHECK) (When Using Techstream) HINT: If the engine switch is turned from on (IG) to on (ACC) or off during Test Mode (signal check), DTCs recorded during the sensor check will be cleared. During Test Mode (signal check), the skid control ECU (brake actuator assembly) records all DTCs detected in the sensor check. By performing Test Mode (signal check), the codes are cleared as the normal condition for each item is confirmed. The remaining codes are the codes where an abnormality was found. Procedure to enter Test Mode Turn the engine switch off. Check that the steering wheel is centered. Apply the parking brake. Check that the shift lever is in P. Connect the Techstream to the DLC3. Turn the engine switch on (IG). Turn the Techstream on. Switch the skid control ECU (brake actuator assembly) to Test Mode using the Techstream. Enter the following menus: Chassis / ABS/VSC/TRAC / Utility / Signal Check. Chassis > ABS/VSC/TRAC > Utility Tester Display Signal Check Check that the ABS warning and slip indicator lights come on for several seconds and then blink in the Test Mode pattern. HINT: If the ABS warning and slip indicator lights do not blink, inspect the ABS warning and slip indicator light circuits. Check the ABS sensors. HINT: Check that the ABS warning light is blinking in the Test Mode pattern before performing the following ABS sensor checks. Acceleration Sensor Check Keep the vehicle stationary on a level surface for 1 second or more. HINT: The acceleration sensor check can be performed by following the master cylinder pressure sensor check procedure below. Lost Booster Pressure Judgment Check and Master Cylinder Pressure Sensor Zero Point Calibration NOTE: Perform this check in the lost booster pressure state (vacuum in the booster is released by pumping the brake pedal). Turn the engine switch on (IG). Check that the brake warning light comes on when depressing the brake pedal with a force of 59.0 N (6.0 kgf, 13.2 lbf) or more for 1 second or more. (The lost booster pressure state is judged to be normal.) Start the engine while depressing the brake pedal with a force of 59.0 N (6.0 kgf, 13.2 lbf) or more for 1 second or more. Check that the brake warning light goes off when quickly releasing the brake pedal. (The lost booster pressure state is judged to be normal.) Leave the vehicle for 1 second or more. (Master cylinder pressure sensor zero point calibration) NOTE: If depressing the brake pedal slowly or repeatedly, the master cylinder pressure sensor zero point calibration is not performed normally. If the lost booster pressure judgment check results are not normal, then the master cylinder pressure sensor check cannot be performed. If rechecking after the engine has started, end Test Mode, enter Test Mode again, and release vacuum in the booster by pumping the brake pedal prior to rechecking. HINT: If the lost booster pressure state is not judged to be normal, the brake warning light comes on and Test Mode DTC C1281 (Master Cylinder Pressure Sensor Output Malfunction) is stored. Master Cylinder Pressure Sensor Check Leave the vehicle in a stationary condition and release the brake pedal for 1 second or more, and quickly and continuously depress the brake pedal with a force greater than 98 N (10 kgf, 22.0 lbf) for 1 second. Check that the ABS warning light stays on for 3 seconds. HINT: Confirm that the ABS warning light comes on. While the ABS warning light stays on, continue to depress the brake pedal with a force of 98 N (10 kgf, 22.0 lbf) or more. The ABS warning light comes on for 3 seconds every time the preceding brake pedal operation is performed. Speed Sensor Check Drive the vehicle straight-ahead. Accelerate the vehicle to a speed of 45 km/h (28 mph) or more for several seconds. HINT: The sensor check may not complete if wheelspin occurs. The ABS warning light comes on immediately if a malfunction is detected during the speed sensor check. NOTE: The speed sensor check may not complete if the speed sensor check is started while turning the steering wheel or spinning the wheels. After the ABS warning light goes off, if vehicle speed exceeds 80 km/h (50 mph), a sensor check code will be stored again. Decelerate or stop the vehicle before the speed reaches 80 km/h (50 mph). Check that the ABS warning light goes off. HINT: The ABS warning light goes off when the sensor check has completed. The ABS warning light comes on immediately after a malfunction has been detected during the speed sensor check. Stop the vehicle. HINT: When the sensor check has completed, the ABS warning light goes off while the vehicle is being driven, and blinks in the Test Mode pattern while the vehicle is stopped. NOTE: If the sensor check has not completed, the ABS warning light will blink while the vehicle is being driven and the ABS will not operate. VSC Sensor Check HINT: Check that the slip indicator light is blinking in the Test Mode pattern before performing the following VSC sensor check. Yaw Rate Sensor Zero Point Check Check that the shift lever is in P. Keep the vehicle stationary on a level surface for 5 seconds or more after the engine switch is turned on (IG). VSC OFF Switch (Combination Switch Assembly) Check Press the VSC OFF switch (combination switch assembly). Check that the VSC OFF indicator light comes on. Press the VSC OFF switch (combination switch assembly) again. End of Sensor Check If the sensor checks have completed, the ABS warning light blinks in the Test Mode pattern when the vehicle is stopped and the ABS warning light goes off while the vehicle is being driven. NOTE: If the sensor checks have not completed, the ABS warning light will blink while the vehicle is being driven and the ABS will not operate. Reading Sensor Check DTCs Read the DTCs by following the Techstream screen. NOTE: If only DTCs other than Test Mode sensor check DTCs are displayed, repair the malfunctions and clear the DTCs. If Test Mode sensor check DTCs and other DTCs are displayed or if only Test Mode sensor check DTCs are displayed, repair the malfunctions, clear the DTCs, and perform Test Mode inspection again. HINT: See "Sensor Check DTCs". Turn the engine switch off and disconnect the Techstream. Sensor Check DTCs ABS Sensor DTC No. Detection Item Trouble Area C1270 Initialization Incomplete ECM CAN communication system (Skid control ECU to ECM) Skid control ECU (brake actuator assembly) C1271 Low Output Signal of Front Speed Sensor RH Sensor installation for 2WD: Front speed sensor RH (front axle hub sub-assembly RH) for AWD: Front speed sensor RH C1272 Low Output Signal of Front Speed Sensor LH Sensor installation for 2WD: Front speed sensor LH (front axle hub sub-assembly LH) for AWD: Front speed sensor LH C1273 Low Output Signal of Rear Speed Sensor RH Rear speed sensor RH Sensor installation Rear speed sensor rotor RH (rear axle hub and bearing assembly RH) C1274 Low Output Signal of Rear Speed Sensor LH Rear speed sensor LH Sensor installation Rear speed sensor rotor LH (rear axle hub and bearing assembly LH) C1275 Abnormal Change in Output Signal of Front Speed Sensor RH Front speed sensor rotor RH (front axle hub sub-assembly RH) C1276 Abnormal Change in Output Signal of Front Speed Sensor LH Front speed sensor rotor LH (front axle hub sub-assembly LH) C1277 Abnormal Change in Output Signal of Rear Speed Sensor RH Rear speed sensor rotor RH (rear axle hub and bearing assembly RH) C1278 Abnormal Change in Output Signal of Rear Speed Sensor LH Rear speed sensor rotor LH (rear axle hub and bearing assembly LH) C1279 Acceleration Sensor Output Voltage Malfunction Sensor installation Acceleration sensor (yaw rate and acceleration sensor) C1281 Master Cylinder Pressure Sensor Output Malfunction Stop light switch assembly Master cylinder pressure sensor (brake actuator assembly) VSC Sensor DTC No. Detection Item Trouble Area C1473 Yaw Rate Sensor Malfunction Yaw rate sensor (yaw rate and acceleration sensor) HINT: The codes in this table are output only in Test Mode (signal check).
3. SENSOR CHECK USING TEST MODE (SIGNAL CHECK) (When Using SST Check Wire) HINT: If the engine switch is turned from on (IG) to on (ACC) or off during Test Mode (signal check), DTCs recorded during the sensor check will be cleared. During Test Mode (signal check), the skid control ECU (brake actuator assembly) records all DTCs detected in the sensor check. By performing Test Mode (signal check), the codes are cleared as the normal condition for each item is confirmed. The remaining codes are the codes where an abnormality was found. Procedure to enter Test Mode Turn the engine switch off. Check that the steering wheel is centered. Apply the parking brake. Check that the shift lever is in P. Using SST, connect terminals TS and CG of the DLC3. *a Front view of DLC3 SST: 09843-18040 Turn the engine switch on (IG). Check that the ABS warning and slip indicator lights come on for several seconds and then blink in the Test Mode pattern. HINT: If the ABS warning and slip indicator lights do not blink, inspect the TS and CG terminal circuit and ABS warning and slip indicator light circuits. Check the ABS sensors. HINT: Check that the ABS warning light is blinking in the Test Mode pattern before performing the following ABS sensor checks. Acceleration Sensor Check Keep the vehicle stationary on a level surface for 1 second or more. HINT: The acceleration sensor check can be performed by following the master cylinder pressure sensor check procedure below. Lost Booster Pressure Judgment Check and Master Cylinder Pressure Sensor Zero Point Calibration NOTE: Perform this check in the lost booster pressure state (vacuum in the booster is released by pumping the brake pedal). Turn the engine switch on (IG). Check that the brake warning light comes on when depressing the brake pedal with a force of 59.0 N (6.0 kgf, 13.2 lbf) or more for 1 second or more. (The lost booster pressure state is judged to be normal.) Start the engine while depressing the brake pedal with a force of 59.0 N (6.0 kgf, 13.2 lbf) or more for 1 second or more. Check that the brake warning light goes off when quickly releasing the brake pedal. (The lost booster pressure state is judged to be normal.) Leave the vehicle for 1 second or more. (Master cylinder pressure sensor zero point calibration) NOTE: If depressing the brake pedal slowly or repeatedly, the master cylinder pressure sensor zero point calibration is not performed normally. If the lost booster pressure judgment check results are not normal, then the master cylinder pressure sensor check cannot be performed. If rechecking after the engine has started, end Test Mode, enter Test Mode again, and release vacuum in the booster by pumping the brake pedal prior to rechecking. HINT: If the lost booster pressure state is not judged to be normal, the brake warning light comes on and Test Mode DTC C1281 (Master Cylinder Pressure Sensor Output Malfunction) is stored. Master Cylinder Pressure Sensor Check Leave the vehicle in a stationary condition and release the brake pedal for 1 second or more, and quickly and continuously depress the brake pedal with a force greater than 98 N (10 kgf, 22.0 lbf) for 1 second. Check that the ABS warning light stays on for 3 seconds. HINT: Confirm that the ABS warning light comes on. While the ABS warning light stays on, continue to depress the brake pedal with a force of 98 N (10 kgf, 22.0 lbf) or more. The ABS warning light comes on for 3 seconds every time the preceding brake pedal operation is performed. Speed Sensor Check Drive the vehicle straight-ahead. Accelerate the vehicle to a speed of 45 km/h (28 mph) or more for several seconds. NOTE: The speed sensor check may not complete if the speed sensor check is started while turning the steering wheel or spinning the wheels. After the ABS warning light goes off, if vehicle speed exceeds 80 km/h (50 mph), a sensor check code will be stored again. Decelerate or stop the vehicle before the speed reaches 80 km/h (50 mph). HINT: The sensor check may not complete if wheelspin occurs. The ABS warning light comes on immediately if a malfunction is detected during the speed sensor check. Check that the ABS warning light goes off. HINT: The ABS warning light goes off when the sensor check has completed. The ABS warning light comes on immediately after a malfunction has been detected during the speed sensor check. Stop the vehicle. NOTE: If the sensor check has not completed, the ABS warning light will blink while the vehicle is being driven and the ABS will not operate. HINT: When the sensor check has completed, the ABS warning light goes off while the vehicle is being driven, and blinks in the Test Mode pattern while the vehicle is stopped. VSC Sensor Check HINT: Check that the slip indicator light is blinking in the Test Mode pattern before performing the following VSC sensor check. Yaw Rate Sensor Zero Point Check Check that the shift lever is in P. Keep the vehicle stationary on a level surface for 5 seconds or more after the engine switch is turned on (IG). VSC OFF Switch (Combination Switch Assembly) Check Press the VSC OFF switch (combination switch assembly). Check that the VSC OFF indicator light comes on. Press the VSC OFF switch (combination switch assembly) again. End of Sensor Check If the sensor checks have completed, the ABS warning light blinks in the Test Mode pattern when the vehicle is stopped and the ABS warning light goes off while the vehicle is being driven. NOTE: If the sensor checks have not completed, the ABS warning light will blink while the vehicle is being driven and the ABS will not operate. Reading Sensor Check DTCs *a Front view of DLC3 Using SST, connect terminals TC and CG of the DLC3. SST: 09843-18040 Count the number of blinks of the ABS warning and slip indicator lights. NOTE: If only DTCs other than Test Mode sensor check DTCs are displayed, repair the malfunctions and clear the DTCs. If Test Mode sensor check DTCs and other DTCs are displayed or if only Test Mode sensor check DTCs are displayed, repair the malfunctions, clear the DTCs, and perform Test Mode inspection again. 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. If more than 1 malfunction is detected at the same time, the lowest numbered code will be displayed first. See "Sensor Check DTCs". After performing the check, disconnect SST from terminals TS and CG, and TC and CG of the DLC3, and turn the engine switch off. Turn the engine switch on (IG) to cancel Test Mode. HINT: If the engine switch is not turned off and back on (IG) after SST is removed from the DLC3, the previous Test Mode will continue. If the engine switch is turned back on (IG) with terminals TS and CG connected, the previous Test Mode will continue. Sensor Check DTCs ABS Sensor DTC No. Detection Item Trouble Area 71 Low Output Signal of Front Speed Sensor RH Sensor installation for 2WD: Front speed sensor RH (front axle hub sub-assembly RH) for AWD: Front speed sensor RH 72 Low Output Signal of Front Speed Sensor LH Sensor installation for 2WD: Front speed sensor LH (front axle hub sub-assembly LH) for AWD: Front speed sensor LH 73 Low Output Signal of Rear Speed Sensor RH Rear speed sensor RH Sensor installation Rear speed sensor rotor RH (rear axle hub and bearing assembly RH) 74 Low Output Signal of Rear Speed Sensor LH Rear speed sensor LH Sensor installation Rear speed sensor rotor LH (rear axle hub and bearing assembly LH) 75 Abnormal Change in Output Signal of Front Speed Sensor RH Front speed sensor rotor RH (front axle hub sub-assembly RH) 76 Abnormal Change in Output Signal of Front Speed Sensor LH Front speed sensor rotor LH (front axle hub sub-assembly LH) 77 Abnormal Change in Output Signal of Rear Speed Sensor RH Rear speed sensor rotor RH (rear axle hub and bearing assembly RH) 78 Abnormal Change in Output Signal of Rear Speed Sensor LH Rear speed sensor rotor LH (rear axle hub and bearing assembly LH) 79 Acceleration Sensor Output Voltage Malfunction Sensor installation Acceleration sensor (yaw rate and acceleration sensor) 81 Master Cylinder Pressure Sensor Output Malfunction Stop light switch assembly Master cylinder pressure sensor (brake actuator assembly) 88 Initialization Incomplete ECM CAN communication system (Skid control ECU to ECM) Skid control ECU (brake actuator assembly) VSC DTC No. Detection Item Trouble Area 71 Yaw Rate Sensor Malfunction Yaw rate sensor (yaw rate and acceleration sensor) HINT: The codes in this table are output only in Test Mode (signal check).

FREEZE FRAME DATA [04/2013 - ]

1. FREEZE FRAME DATA Whenever an ABS DTC is detected, the skid control ECU (brake actuator assembly) stores the current vehicle (ECU or sensor) state as Freeze Frame Data. The skid control ECU (brake actuator assembly) 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 driven at a low speed (7 km/h (4.3 mph) or less), or if a DTC is detected, the skid control ECU (brake actuator assembly) will stop counting the number. Freeze Frame Data at the time the ABS operates: The skid control ECU (brake actuator assembly) stores and updates data whenever the ABS 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 (brake actuator assembly) stores data at the time a DTC is detected, no updates will be performed until the data is cleared.
2. CHECK FREEZE FRAME DATA Turn the engine switch off. 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. Chassis > ABS/VSC/TRAC > Trouble Codes Select a DTC to display its Freeze Frame Data. Chassis > ABS/VSC/TRAC Tester Display Measurement Item Range Normal Condition Diagnostic Note Elapsed Time after Freeze Trigger Elapsed time after freeze trigger Min.: 0 msec, Max.: 500 msec - - Number of IG ON Number of times engine switch turned on (IG) after Freeze Frame Data stored 0 to 31 - - Stop Light SW Stop light switch assembly ON or OFF ON: Brake pedal depressed OFF: Brake pedal released - Parking Brake SW Parking brake switch assembly 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, TRAC, BA, HAB, PBA, PB, HA-CTRL, TSC, Fail, Sys or Non Actual operated system ABS: ABS activated VSC: VSC activated TRAC: TRAC activated BA: BA activated HAB: High power assist brake activated PBA: PBA activated PB: PB activated HA-CTRL: Hill-start assist control activated TSC: Trailer sway control activated* Fail: Fail safe mode activated Sys: System prohibit activated Non: No operation activated Master Cylinder Sensor Master cylinder pressure sensor reading Min.: 0.00 V, Max.: 5.00 V Brake pedal released: 0.30 to 0.80 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 Brake pedal 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°/s, Max.: 127°/s Vehicle stopped: 0°/s Turning right: -128 to 0°/s Turning left: 0 to 127°/s - Lateral G Lateral G Min.: -25.10 m/s 2 , Max.: 24.90 m/s 2 - During turning: Changes in proportion with lateral 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 FR Wheel Speed Front wheel speed sensor RH reading 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 reading 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 reading 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 reading 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 reading 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 Grade Vehicle speed grade Min.: -25.10 m/s 2 , Max.: 24.90 m/s 2 Vehicle stopped: 0.00 m/s 2 During driving: Changes in proportion with vehicle acceleration/deceleration Accelerator Opening Angle % Percentage of accelerator pedal opening angle Min.: 0.0%, Max.: 127.0% Accelerator pedal released: 0.0% During accelerator pedal operation: Changes in proportion with the pedal movement IG1 Voltage Value IG1 voltage value Min.: 0.00 V, Max.: 20.00 V Engine switch on (IG): 11.00 to 14.00 V - FR Target Oil Pressure The value of the target oil pressure applied to the front brake RH Min.: 0 Mpa, Max.: 20 Mpa - Operating the brake pedal: Varies depending on the target oil pressure FL Target Oil Pressure The value of the target oil pressure applied to the front brake LH Min.: 0 Mpa, Max.: 20 Mpa - Operating the brake pedal: Varies depending on the target oil pressure RR Target Oil Pressure The value of the target oil pressure applied to the rear brake RH Min.: 0 Mpa, Max.: 20 Mpa - Operating the brake pedal: Varies depending on the target oil pressure RL Target Oil Pressure The value of the target oil pressure applied to the rear brake LH Min.: 0 Mpa, Max.: 20 Mpa - Operating the brake pedal: Varies depending on the target oil pressure Brake Pedal Load Sensing SW Brake pedal load sensing switch ON or OFF ON: Brake pedal depressed OFF: Brake pedal released - Inspection Mode Inspection mode Other or Inspect Other: Normal mode Inspect: Inspection mode - Steering Angle Sensor Steering angle sensor Min.: -3276.8°, Max.: 3276.7° Turning left: Increases Turning right: Decreases - TRAC/VSC Off Mode TRAC/VSC off mode Normal, TRAC OFF or VSC OFF Normal: Normal mode TRAC OFF: TRAC off mode VSC OFF: VSC off mode - Power Train Driving force Power train driving force that is currently occurring Min.: -327680 N, Max.: 327670 N - - HINT: *: Not supported
3. CLEAR FREEZE FRAME DATA NOTE: Clearing the DTCs will also clear the Freeze Frame Data. Turn the engine switch off. Connect the Techstream to the DLC3. Turn the engine switch on (IG). Clear the DTCs and Freeze Frame Data. Refer to «DTC CHECK / CLEAR [04/2013 - ]»(ref-665532-S37150082782014102400000) Chassis > ABS/VSC/TRAC > Clear DTCs

FAIL-SAFE CHART [04/2013 - ]

1. FAIL-SAFE OPERATION If there is a problem with sensor signals or actuator systems, the skid control ECU prohibits power supply to the brake actuator assembly and informs the ECM of a VSC system malfunction. The brake actuator assembly turns off the solenoids and the ECM stops its VSC control 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, TRAC 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 [04/2013 - ]»(ref-665532-S33750327952014102400000) If a VSC system component malfunctions before VSC control begins, VSC control will be prohibited. If a system component malfunctions during VSC control, the system will gradually stop performing control so as not to trigger a sudden change in vehicle operation. If it is impossible for control to continue, the warning light comes on to inform the driver of system control termination. Refer to «DIAGNOSIS SYSTEM [04/2013 - ]»(ref-665532-S33750327952014102400000) ABS, EBD AND BA SYSTEM Item Operation Malfunction in the ABS. ABS, BA, TRAC and VSC control prohibited. Malfunction in the BA system. ABS, BA, TRAC and VSC control prohibited. Malfunction in the EBD system. ABS, EBD, BA, TRAC and VSC control prohibited. TRAC AND VSC SYSTEM Item Operation Malfunction in the engine control system (TRAC and VSC systems). Before control: Disables control. During control: Uses only the brakes to perform control. Malfunction in the brake control system (VSC system). Before control: Disables control. During control: Uses only the engine to perform control. Malfunction in the brake control system (TRAC system). Before control: Disables control. During control: Disables control (by gradually ending control).