Scheme 1
Description of ESC
Electronic Stability Control (ESC) recognizes critical driving conditions, such as panic reactions in dangerous situations, and stabilizes the vehicle by wheel-individual braking and engine control intervention.
ESC adds a further function known as Active Yaw Control (AYC) to the ABS, TCS, EBD and ESC functions. Whereas the ABS/TCS function controls wheel slip during braking and acceleration and, thus, mainly intervenes in the longitudinal dynamics of the vehicle, active yaw control stabilizes the vehicle about its vertical axis.
This is achieved by wheel individual brake intervention and adaptation of the momentary engine torque with no need for any action to be taken by the driver.
ESC essentially consists of three assemblies: the sensors, the electronic control unit and the actuators.
The stability control feature works under all driving and operating conditions. Under certain driving conditions, the ABS/TCS function can be activated simultaneously with the ESC function in response to a command by the driver.
In the event of a failure of the stability control function, the basic safety function, ABS, is still maintained.
Scheme 2
Description of ESC Control
ESC system includes ABS/EBD, TCS and AYC function.
ABS/EBD function: The ECU changes the active sensor signal (current shift) coming from the four wheel sensors to the square wave. By using the input of above signals, the ECU calculates the vehicle speed and the acceleration & deceleration of the four wheels. And, the ECU judges whether the ABS/EBD should be actuated or not.
TCS function prevents the wheel slip of drive direction by adding the brake pressure and engine torque reduction via CAN communication. TCS function uses the wheel speed sensor signal to determine the wheel slip as far as ABS function.
AYC function prevents unstable maneuver of the vehicle. To determine the vehicle maneuver, AYC function uses the maneuver sensor signals (Yaw Rate Sensor, Lateral Acceleration Sensor, Steering Wheel Angle Sensor).
If vehicle maneuver is unstable (Over Steer or Under Steer), AYC function applies the brake pressure on certain wheel, and send engine torque reduction signal by CAN.
After the key-on, the ECU continually diagnoses the system failure. (self-diagnosis) If the system failure is detected, the ECU informs driver of the system failure through the BRAKE/ABS/ESC warning lamp. (fail-safe warning)
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- ESC Non-operation: Normal braking. Solenoid valve Continuity Valve Motor pump TC Valve IN (NO) OFF OPEN OFF OFF OUT (NC) OFF CLOSE
- ESC operation Solenoid valve Continuity Valve Motor pump TC Valve Understeering (Only inside of rear wheel) IN (NO) OFF OPEN ON ON OUT (NC) OFF CLOSE Oversteering (Only outside of front wheel) IN (NO) OFF OPEN OUT (NC) OFF CLOSE
ABS Warning Lamp module
The active ABS warning lamp module indicates the self-test and failure status of the ABS. The ABS warning lamp shall be on
- During the initialization phase after IGN ON. (continuously 3 seconds).
- In the event of inhibition of ABS functions by failure.
- During diagnostic mode.
- When the ECU Connector is separated from ECU.
- Cluster lamp is ON when communication is impossible with CAN module.
EBD/Parking Brake Warning Lamp Module
The active EBD warning lamp module indicates the self-test and failure status of the EBD. However, in case the Parking Brake Switch is turned on, the EBD warning lamp is always turned on regardless of EBD functions. The EBD warning lamp shall be on
- During the initialization phase after IGN ON. (continuously 3 seconds).
- When the Parking Brake Switch is ON or brake fluid level is low.
- When the EBD function is out of order.
- During diagnostic mode.
- When the ECU Connector is separated from ECU.
- Cluster lamp is ON when communication is impossible with CAN module.
ESC Function/Warning Lamp
The ESC function/warning lamp indicates the self-test and failure status of the ESC.
The ESC function/warning lamp is turned on under the following conditions
- During the initialization phase after IGN ON. (continuously 3 seconds).
- When the ESC function is inhibited by system failure.
- When the ESC control is operating. (Blinking - 2Hz)
- During diagnostic mode. (Except standard mode)
- Cluster lamp is ON when communication is impossible with CAN module.
ESC Off Lamp
The ESC Off lamp indicates the self-test and operating status of the ESC.
The ESC Off lamp operates under the following conditions
- During the initialization mode after IGN ON. (continuously 3 seconds).
- ESC Off lamp is On when driver input the ESC Off switch.
ESC On/Off Switch
The ESC On/Off Switch shall be used to toggle the ESC function between On/Off states based upon driver input.
The On/Off switch shall be a normally open, momentary contact switch. Closed contacts switch the circuit to ignition.
Initial status of the ESC function is on and switch toggle the state.
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| Connector Terminal | Specification | |
|---|---|---|
| Pin No | Description | |
| 29 | IGNITION1(+) | High level of wake up voltage: 4.5V < V < 16.0V Low level of wake up voltage: V < 2.4V Max. current: I < 50mA |
| 25 | POS. BATTERY 1. (SOLENOID) | Over voltage range: 17.0 ± 0.5V Operating voltage range: 10.0 ± 0.5V < V < 16.0 ± 0.5V Low voltage range: 7.0 ± 0.5V < V < 9.5 ± 0.5V Max. current: I < 40A Max. leakage current: I < 0.25mA |
| 1 | POS. BATTERY 2. (MOTOR) | Operating voltage range: 10.0 ± 0.5V < V < 16.0 ± 0.5V Rush current: I < 110A Max current: I < 40A Max leakage current: I < 0.25mA |
| 38 | GROUND | Rated current: I < 550mA Max. current: I < 40A |
| 13 | PUMP MOTOR GROUND | Rush current: I < 110A Max current: I < 40A |
| 23 | BRAKE LIGHT SWITCH | Input voltage (Low): V < 2V Input voltage (High): V > 6V 10 ESC ON/OFF SWITCH Max. Input current: I < 3mA (@12.8V) |
| 28 | SENSOR FRONT RIGHT OUTPUT | External pull up resistance: 1 Kohms < R Output duty: 50 ± 20% |
| 14 | CAN BUS LINE (LOW) | Max. Input current: I < 10mA |
| 26 | CAN BUS LINE (HIGH) | |
| 18 | SENSOR FRONT LEFT POWER | Output voltage: V_BAT1 -0.6V ~ V_BAT1 -1.1V Output current: Max 30mA |
| 34 | SENSOR FRONT RIGHT POWER | |
| 19 | SENSOR REAR LEFT POWER | |
| 33 | SENSOR REAR RIGHT POWER | |
| 31 | SENSOR FRONT LEFT SIGNAL | Input current LOW: 5.9 ~ 8.4mA Input current HIGH: 11.8 ~ 16.8mA Frequency range: 1 ~ 2500Hz Input duty: 50 ± 10% |
| 21 | SENSOR FRONT RIGHT SIGNAL | |
| 32 | SENSOR REAR LEFT SIGNAL | |
| 20 | SENSOR REAR RIGHT SIGNAL | |
| 12 | CAN SENSOR LINE (HIGH) | Max. input current: I < 10mA |
| 24 | CAN SENSOR LINE (LOW) | |
| 8 | HAC RELAY DRIVE | Max. Current: I< 180mA Max. Output Low Voltage: V< 1.2V |
| 9 | BRAKE SWITCH | Input voltage (Low): V < 2V Input voltage (High): V > 6V Max. Input current: I < 10mA |
| 36 | RELAY STATE MONITORING | |
Failure Diagnosis
- In principle, ESC and TCS controls are prohibited in case of ABS failure.
- When ESC or TCS fails, only the failed system control is prohibited.
- However, when the solenoid valve relay should be turned off in case of ESC failure, refer to «C2380 ABS/TCS/ESC (ESP) VALVE ERROR»(/hyundai/santa-fe/iii-2012-2016/remont/anti-locktraction-control/#antilock-brake-system-abselectronic-stability-control-esc-diagnosis) .
- Information on ABS fail-safe is identical to the fail-safe in systems where ESC is not installed.
Memory of Fail Code
- It keeps the code as far as the backup lamp power is connected. (O)
- It keeps the code as far as the HCU power is on. (X)
Failure Checkup
- Initial checkup is performed immediately after the HECU power on.
- Valve relay checkup is performed immediately after the IG2 ON.
- It executes the checkup all the time while the IG2 power is on.
Countermeasures in Fail
- Turn the system down and perform the following actions and wait for HECU power OFF.
- Turn the valve relay off.
- Stop the control during the operation and do not execute any until the normal condition recovers.
Warning Lamp ON
- ESC warning lamp turn on for 3sec after IGN ON.
- ESC function lamp blinks when ESC Act.
- If ESC fail occurred, ESC warning turns ON.
- ESC OFF lamp turn on in case of ESC Switch OFF 3sec after IGN ON
Scheme 12
Notes With Regard To Diagnosis
The phenomena listed in the following table are not abnormal.
| Condition | Explanation |
|---|---|
| System check sound | When starting the engine, a thudding sound can sometimes be heard coming from inside the engine compartment. This is because the system operation check is being performed. |
| ABS operation sound | Sound of the motor inside the ABS hydraulic unit operation (whine). Sound is generated along with vibration of the brake pedal (scraping). When ABS operates, sound is generated from the vehicle chassis due to repeated brake application and release (Thump: suspension; squeak: tires) |
| ABS operation (Long braking distance) | For road surfaces such as snow-covered and gravel roads, the braking distance for vehicles with ABS can sometimes be longer than that for other vehicles. Accordingly, advise the customer to drive safely on such roads by lowering the vehicle speed. |
| Diagnosis detection conditions can vary depending on the diagnosis code. When checking the trouble symptom after the diagnosis code has been erased, ensure that the requirements listed in "Comment" are met. | |
Scheme 13
Symptoms Table
| Symptom | Suspect Area |
|---|---|
| ABS does not operate. | Only when 1~4 are all normal and the problem is still occurring, replace the HECU. Check the DTC reconfirming that the normal code is output. Power source circuit. Speed sensor circuit. Check the hydraulic circuit for leakage. |
| ABS does not operate intermittently. | Only when 1~4 are all normal and the problem is still occurring, replace the ABS actuator assembly. Check the DTC reconfirming that the normal code is output. Wheel speed sensor circuit. Stop lamp switch circuit. Check the hydraulic circuit for leakage. |
| Communication with GDS is not possible. (Communication with any system is not possible) | Power source circuit CAN line |
| Communication with GDS is not possible. (Communication with ABS only is not possible) | Power source circuit CAN line HECU |
| When ignition key is turned ON (engine OFF), the ABS warning lamp does not light up. | ABS warning lamp circuit HECU |
| Even after the engine is started, the ABS warning lamp remains ON. | ABS warning lamp circuit HECU |
Note. During ABS operation, the brake pedal may vibrate or may not be able to be depressed. Such phenomena are due to intermittent changes in hydraulic pressure inside the brake line to prevent the wheels from locking and is not an abnormality.
ABS Does Not Operate
| Trouble Symptoms | Possible Cause |
|---|---|
| Brake operation varies depending on driving conditions and road surface conditions, so diagnosis can be difficult. However if a normal DTC is displayed, check the following probable cause. When the problem is still occurring, replace the ESC control module. | Faulty power source circuit Faulty wheel speed sensor circuit Faulty hydraulic circuit for leakage Faulty HECU |
DETECTING CONDITION
DTC Inspection
- Connect the GDS with the data link connector and turn the ignition switch ON.
- Verify that the DTC code is output.
- Is the DTC code output? NO Check the power source circuit. YES Erase the DTC and recheck using GDS.
Scheme 14
- Disconnect the connector from the ESC control module.
- Turn the ignition switch ON, measure the voltage between terminal 29 of the ESC control module harness side connector and body ground. Specification: approximately B+
- Is the voltage within specification? YES Check the ground circuit. NO Check the harness or connector between the fuse (10A) in the engine compartment junction block and the ESC control module. Repair if necessary.
Scheme 15
- Disconnect the connector from the ESC control module.
- Check for continuity between terminals 13, 38 of the ESC control module harness side connector and ground point.
- Is there continuity? YES Check the wheel speed sensor circuit. NO Repair an open in the wire and ground point.
Check the wheel speed sensor circuit
- Refer to «ANTILOCK BRAKE SYSTEM (ABS)/ELECTRONIC STABILITY CONTROL (ESC) DTCS»(/hyundai/santa-fe/iii-2012-2016/remont/dtc-index/#dtc-index__antilock-brake-system-abselectronic-stability-control)
- Is it normal? YES Check the hydraulic circuit for leakage. NO Repair or replace the wheel speed sensor.
Check the hydraulic circuit for leakage
- Refer to «BRAKE LINE»(/hyundai/santa-fe/iii-2012-2016/remont/mechanical-hydraulic/#brake-system) .
- Inspect leakage of the hydraulic lines.
- Is it normal? YES The problem is still occurring, replace the ESC control module. NO Repair the hydraulic lines for leakage.
ABS Does Not Operate (Intermittently)
| Trouble Symptoms | Possible Cause |
|---|---|
| Brake operation varies depending on driving conditions and road surface conditions, so diagnosis can be difficult. However if a normal DTC is displayed, check the following probable cause. When the problem is still occurring, replace the ESC control module. | Faulty power source circuit Faulty wheel speed sensor circuit Faulty hydraulic circuit for leakage Faulty HECU |
DETECTING CONDITION
- Connect the GDS with the data link connector and turn the ignition switch ON.
- Verify that the DTC code is output.
- Is the DTC code output? NO Check the wheel speed sensor circuit. YES Erase the DTC and recheck using GDS.
- Refer to «ANTILOCK BRAKE SYSTEM (ABS)/ELECTRONIC STABILITY CONTROL (ESC) DTCS»(/hyundai/santa-fe/iii-2012-2016/remont/dtc-index/#dtc-index__antilock-brake-system-abselectronic-stability-control) .
- Is it normal? YES Check the stop lamp switch circuit. NO Repair or replace the wheel speed sensor.
Scheme 16
- Check that stop lamp lights up when brake pedal is depressed and turns off when brake pedal is released.
- Measure the voltage between terminal 23 of the ESC control module harness side connector and body ground when brake pedal is depressed. Specification : approximately B+
- Is the voltage within specification? YES Check the hydraulic circuit for leakage. NO Repair the stop lamp switch. Repair an open in the wire between the ESC control module and the stop lamp switch.
- Refer to «BRAKE LINE»(/hyundai/santa-fe/iii-2012-2016/remont/mechanical-hydraulic/#brake-system) .
- Inspection leakage of the hydraulic lines.
- Is it normal? YES The problem is still occurring, replace the ESC control module. NO Repair the hydraulic lines for leakage.
Communication with GDS is not possible. (Communication with any system is not possible)
| Trouble Symptoms | Possible Cause |
|---|---|
| Possible defect in the power supply system (including ground) for the diagnosis line. | An open in the wire Poor ground Faulty power source circuit |
DETECTING CONDITION
Scheme 17
- Measure the voltage between terminal 16 of the data link connector and body ground. Specification : approximately B+
- Is voltage within specification? YES Check the ground circuit for the diagnosis. NO Repair an open in the wire. Check and replace fuse from the engine compartment junction block.
Scheme 18
- Check for continuity between terminal 4 of the data link connector and body ground.
- Is there continuity? NO Repair an open in the wire between terminal 4 of the data link connector and ground point.
Communication with GDS is not possible. (Communication with ABS only is not possible)
| Trouble Symptoms | Possible Cause |
|---|---|
| When communication with GDS is not possible, the cause may be probably an open in the HECU power circuit or an open in the diagnosis output circuit. | An open in the wire Faulty HECU Faulty power source circuit |
DETECTING CONDITION
Check for Continuity in the CAN Line
- Disconnect the connector from the ESC control module.
- Check for continuity between terminals 26, 14 of the ESC control module connector and 3, 11 of the data link connector.
- Is there continuity? YES Check the power source of ESC control module. NO Repair an open in the wire.
Scheme 19
- Disconnect the connector from the ESC control module.
- Turn the ignition switch ON, measure the voltage between terminal 29 of the ESC control module harness side connector and body ground. Specification : approximately B+
- Is voltage within specification? YES Check for poor ground. NO Check the harness or connector between the fuse (10A) in the engine compartment junction block and the ESC control module. Repair if necessary.
Check for poor ground
- Check for continuity between terminal 4 of the data link connector and ground point. YES Replace the ESC control module and recheck. NO Repair an open in the wire or poor ground
Scheme 20
When ignition Key Is turned ON (engine OFF), The ABS Warning Lamp does not Light Up
| Trouble Symptoms | Possible Cause |
|---|---|
| When current flows in the HECU the ABS warning lamp turns from ON to OFF as the initial check. Therefore if the lamp does not light up, the cause may be an open in the lamp power supply circuit, a blown bulb, an open in the both circuits between the ABS warning lamp and the HECU, and the faulty HECU. | Faulty ABS warning lamp bulb Blown fuse is related to ABS in the engine compartment junction block Faulty ABS warning lamp module Faulty HECU |
DETECTING CONDITION
Problem verification
- Disconnect the connector from the ESC control module and turn the ignition switch ON.
- Does the ABS warning lamp light up? YES Inspect again after replacing the ESC HECU. NO Check the power source for the ABS warning lamp.
Scheme 21
- Disconnect the instrument cluster connector (M08) and turn the ignition switch ON.
- Measure the voltage between terminal (M08) 39 of the cluster harness side connector and body ground. Specification : approximately B+
- Is voltage within specification? YES Check the CAN circuit resistance for ABS warning lamp. NO Check for blown fuse.
Scheme 22
- Disconnect the instrument cluster connector (M08) and turn the ignition switch OFF.
- Measure the resistance between terminal (M08) 32 and 33 of the cluster harness side connector. Specification : 60ohms
- Is resistance within specification? YES Repair ABS warning lamp bulb or instrument cluster assembly. NO Check the CAN circuit wiring for ABS warning lamp.
Check the CAN circuit wiring for ABS warning lamp
- Disconnect the instrument cluster connector (M08) and ESC HECU connector, and then turn the ignition switch OFF.
- Check for continuity between terminal (M08) 32 of the cluster harness side connector and terminal 26 of ESC HECU harness side. Check for continuity between terminal (M08) 33 of the cluster harness side connector and terminal 14 of ESC HECU harness side. Specification : Below 1ohms
- Is resistance within specification? YES Repair short of wiring between terminal 26, 14 of ESC HECU harness connector and ABS warning lamp module. NO Repair open of wiring between terminal 26, 14 of ESC HECU harness connector and ABS warning lamp module.
Even After The Engine Is Started, The ABS Warning Lamp Remains ON
| Trouble Symptoms | Possible Cause |
|---|---|
| If the HECU detects trouble, it lights the ABS warning lamp while at the same time prohibiting ABS control. At this time, the HECU records a DTC in memory. Even though the normal code is output, the ABS warning lamp remains ON, then the cause may be probably an open or short in the ABS warning lamp circuit. | An open in the wire Faulty instrument cluster assembly Faulty ABS warning lamp module Faulty HECU |
DETECTING CONDITION
Check DTC Output
- Connect the GDS to the 16P data link connector located behind the driver's side kick panel.
- Check the DTC output using GDS.
- Is DTC output? YES Perform the DTC troubleshooting procedure (Refer to «ANTILOCK BRAKE SYSTEM (ABS)/ELECTRONIC STABILITY CONTROL (ESC) DTCS»(/hyundai/santa-fe/iii-2012-2016/remont/dtc-index/#dtc-index__antilock-brake-system-abselectronic-stability-control) . NO Check the CAN circuit resistance for ABS warning lamp.
Scheme 23
- Disconnect the instrument cluster connector (M08) and turn the ignition switch OFF.
- Measure the resistance between terminal (M08) 32 and 33 of the cluster harness side connector. Specification : 60ohms
- Is resistance within specification? YES Repair ABS warning lamp bulb or instrument cluster assembly. NO Check the CAN circuit wiring for ABS warning lamp.
- Disconnect the instrument cluster connector (M08) and ESC HECU connector, and then turn the ignition switch OFF.
- Check for continuity between terminal (M08) 32 of the cluster harness side connector and terminal 26 of ESC HECU harness side. Check for continuity between terminal (M08) 33 of the cluster harness side connector and terminal 14 of ESC HECU harness side. Specification : Below 1ohms
- Is resistance within specification? YES Repair short of wiring between terminal 26, 14 of ESC HECU harness connector and ABS warning lamp module. NO Repair open of wiring between terminal 26, 14 of ESC HECU harness connector and ABS warning lamp module.
Operation
The EBD system (Electronic Brake force Distribution) as a sub-system of the ABS system is to control the maximum braking effectiveness by the rear wheels.
It further utilizes the efficiency of highly developed ABS equipment by controlling the slip of the rear wheels in the partial braking range.
The brake force is moved even closer to the optimum and controlled electronically, thus dispensing with the need for the proportioning valve.
The proportioning valve, because of a mechanical device, has limitations to achieve an ideal brake force distribution to the rear wheels as well as to carry out the flexible brake force distribution proportioning to the vehicle load or weight increasing. And in the event of malfunctioning, driver cannot notice whether it fails or not.
EBD controlled by the ABS Control Module, calculates the slip ratio of each wheel at all times and controls the brake pressure of the rear wheels not to exceed that of the front wheels.
If the EBD fails, the EBD warning lamp (Parking brake lamp) lights up.
Advantages
- Function improvement of the base-brake system.
- Compensation for the different friction coefficients.
- Elimination of the proportioning valve.
- Failure recognition by the warning lamp.
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- Turn the ignition switch OFF.
- Remove the brake fluid from the master cylinder reservoir with a syringe. NOTE: Be sure to completely remove foreign substances from around brake fluid reservoir and cap before opening the reservoir cap. If not, it may cause contamination of brake fluid and deterioration in braking performance. Do not spill brake fluid on the vehicle, it may damage the paint; if brake fluid does contact the paint, wash it off immediately with water.
- Remove the surge tank. (Refer to " «SURGE TANK»(/hyundai/santa-fe/iii-2012-2016/remont/exhaust/#intake-and-exhaust-system) ")
- Pull up the lock of the HECU connector (A) and then disconnect the connector.
- Disconnect the brake tubes from the HECU by unlocking the nuts counterclockwise with a spanner. Tightening torque: 12.7 ~ 16.7 N.m (1.3 ~ 1.7 kgf.m, 9.4 ~ 12.3 lb-ft) 18.6 ~ 22.6 N.m (1.9 ~ 2.3 kgf.m, 13.7 ~ 16.6 lb-ft)
- Loosen the HECU bracket nuts (A) and then remove HECU and bracket. Tightening torque: 16.7 ~ 25.5 N.m (1.7 ~ 2.6 kgf.m, 12.3 ~ 18.8 lb-ft) CAUTION: Never attempt to disassemble the HECU. Never shock the HECU.
- Remove the bolts and then remove the bracket from HECU. Tightening torque: 10.8 ~ 13.7 N.m (1.1 ~ 1.4 kgf.m, 8.0 ~ 10.1 lb-ft)
Installation
- Installation is the reverse of removal.
- Tighten the HECU mounting bolts and nuts to the specified torque.
- After installation, bleed the brake system. (Refer to " «BRAKE SYSTEM BLEEDING»(/hyundai/santa-fe/iii-2012-2016/remont/mechanical-hydraulic/#brake-system) ")
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- Remove the front wheel and tire. Tightening torque: 88.3 ~ 107.9 N.m (9.0 ~ 11.0 kgf.m, 65.1 ~ 79.6 lb-ft)
- Remove the front wheel speed sensor mounting bolt (A). Tightening torque: 6.9 ~ 10.8 N.m (0.7 ~ 1.1 kgf.m, 5.1 ~ 7.6 lb-ft)
- Remove the front wheel guard.
- Remove the front wheel speed sensor cable mounting bolt (A).
- Disconnect the front wheel speed sensor connector (B) and then remove the front wheel speed sensor.
- Installation is the reverse of removal.
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- Remove the rear wheel and tire. Tightening torque: 88.3 ~ 107.9 N.m (9.0 ~ 11.0 kgf.m, 65.1 ~ 79.6 lb-ft)
- Remove the rear wheel speed sensor mounting bolt (A). Tightening torque: 6.9 ~ 10.8 N.m (0.7 ~ 1.1 kgf.m, 5.1 ~ 7.6 lb-ft)
- Remove the rear wheel guard.
- Disconnect the rear wheel speed sensor connector (A).
- Installation is the reverse of removal. NOTE: Install the rear sensor after lubricating the O-ring of sensor with the assembly fluid (RAREMAX AF-1). When inserting the sensor, take care the O-ring not to be damaged.
Scheme 36
- Remove the connector (A) after removing the front wheel speed sensor clip.
- Remove the rear wheel speed sensor. (Refer to " «REAR HUB - CARRIER»(/hyundai/santa-fe/iii-2012-2016/remont/wheel-hubs/#rear-axle-assembly) ")
- Installation is the reverse of removal.
Description
The yaw rate and G sensor is included inside the air bag control module (SRSCM).
When the vehicle is turning with respect to a vertical axis the yaw rate sensor detects the yaw rate electronically by the vibration change of plate fork inside the yaw rate sensor.
If yaw velocity reaches the specific velocity after it detects the vehicle yawing, the ESC control is reactivated.
The later G sensor senses vehicle's lateral G. A small element inside the sensor is attached to a deflectable lever arm by later G.
Direction and magnitude of lateral G loaded to vehicle can be known with electrostatic capacity changing according to lateral G.
Scheme 37
| Description | Specification | Remarks | |
|---|---|---|---|
| Operating voltage | 8 ~ 16V | ||
| Output signal | CAN Interface | ||
| Operating temperature | 40 ~ 85°C (-40 ~ 185°F) | ||
| Yaw-rate sensor | Measurement range | 128 ~ +128°/sec | |
| Frequency response | 15 ~ 45Hz | ||
| G sensor | Measurement range | 1.99 ~ +1.99g | |
| Frequency response | 50Hz ± 60% | ||
PART SPECIFICATIONS
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- Remove the ignition key from the vehicle.
- Disconnect the battery negative cable and wait for at least three minutes before beginning work.
- Remove the floor console. (Refer to " «FLOOR CONSOLE ASSEMBLY»(/hyundai/santa-fe/iii-2012-2016/remont/exteriorinterior-trim/#floor-console) ")
- Loosen the bolts and then remove the rear air vent duct (A).
- Pull up the lock, of the SRSCM connector, the disconnect the connector (A).
- Remove the SRSCM mounting bolts (3EA) from the SRSCM, then remove the SRSCM. CAUTION: You must remove or install SRSCM or other SRS components with the ignition switch OFF to avoid accidental airbag deployment.
- Remove the ignition key from the vehicle.
- Install in the reverse order of removal.
- After installing the SRSCM, confirm proper system operation: Turn the ignition switch ON; the SRS indicator light should be turned on for about six seconds and then go off. CAUTION: SRSCM is sensing the vehicle rollover. SAB, CAB, BPT will be able to expanse if mechanic moves the SRSCM on vehicle during IGN ON state. For this reason, turn the IGN OFF surely and then remove the SRSCM from vehicle. If the SRSCM is replaced always perform variant coding. Also, perform the lateral G sensor calibration. (Refer to " «SRS CONTROL MODULE (SRSCM)»(/hyundai/santa-fe/iii-2012-2016/remont/airbag/#supplemental-restraint-system-control-module-srscm) ")
Scheme 40
- Ignition "OFF", connect GDS.
- Ignition "ON" & Engine "OFF" select vehicle name and ESP system.
- Perform G-sensor calibration.
- Perform the " «G-SENSOR CALIBRATION»(/hyundai/santa-fe/iii-2012-2016/remont/anti-locktraction-control/#electronic-stability-control-esc-system) " procedure with GDS.
- Complete the "G-Sensor Calibration" procedure.
- The ESC OFF switch is for the user to turn off the ESC system.
- The ESC OFF lamp is on when ESC OFF switch is engaged.
Scheme 41
Scheme 42
- Turn ignition switch OFF and disconnect the negative (-) battery cable.
- Remove the crash pad lower panel. (Refer to " «CRASH PAD LOWER PANEL»(/hyundai/santa-fe/iii-2012-2016/remont/gauges-instrument-panels/#crash-pad) ")
- Remove the crash pad side switch assembly (A) after loosening the screws.
- Check the continuity between the switch terminals as the ESC OFF switch is engaged.
The DBC function is the acronym word of Downhill Brake Control function. When a vehicle goes down the hill, just pushing the DBC switch enables the car to keep its vehicle's speed at a constant value without operating the brake pedal. The DBC function is operated when the vehicle is on the decline and its velocity is under the predetermined speed.
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- Turn ignition switch OFF and disconnect the negative (-) battery cable.
- Remove the crash pad lower panel. (Refer to " «CRASH PAD LOWER PANEL»(/hyundai/santa-fe/iii-2012-2016/remont/gauges-instrument-panels/#crash-pad) ")
- Remove the crash pad side switch assembly (A) after loosening the screws.
- Check the continuity between the switch terminals as the DBC switch is engaged.
The Steering Angle Sensor (SAS) is installed in MDPS (Motor Driven Power Steering) and it sends messages to HECU through CAN communication line.
The SAS is used to determine turning direction and speed of the steering wheel.
The HECU uses the signals from the SAS when performing ESC-related calculations.
Components (Steering Angle Sensor, Torque Sensor, Failsafe relay, etc.) of the EPS system are located inside the steering column & EPS unit assembly and the steering column. EPS unit assembly must not be disassemble to be inspected. They must be replaced. (Refer to REPAIR PROCEDURES .