Copyright by Hyundai Motor Company. All rights reserved. ECS

2 Layout Air tube Front Air spring & Damper (LH) Front Air spring & Damper (RH) Rear Air spring & Damper (RH) Rear Air spring & Damper (LH) Reservoir tank Compressor, Solenoid valve block Height sensor (RL) Height sensor (RR) Height sensor (FR) Height sensor (FL) G-sensor (FL) G-sensor (FR) G-sensor (Rear) ECS control module Air filter

3 ECS Air tube connection Air filling Rear air spring Reservoir Compressor Solenoid valve block Air filter Front air spring Click the blank to know the name of component.

4 ECS Leveling control High level (Off-road level) Normal levelLow level (Highway level) LevelFrontRear High level (Off-road level) + 30mm Normal level 0mm (D.H:394) 0mm (D.H:387) Low level (Highway level) -15mm D.H: Design Height (the height from the wheel center to the top edge of wheel housing)

5 ECS Comparison Step motor Damper Coil spring Air spring Solenoid valve Air spring - High strength bag - Aluminum guide [BH][LZ]

6 ECS Component Front Air strut CDC damper Air spring Consists of Air spring, CDC damper Function - Air spring Controls the vehicle height in real time - CDC damper Controls damping force depending on the road condition Connected to air tube Solenoid valve

7 ECS Component Rear Air spring Consists of Air spring, Urethane pad to absorb the shock and Protector to isolate the foreign materials. Function Controls the vehicle height in real time (Air spring) Principle – Air spring Controls the vehicle height filling or discharging the air via tube. Air spring Urethane pad Protector Connected to air tube

8 ECS Component CDC damper Piston valve Solenoid valve Function Controls the damping force depending on the road condition (CDC damper) Principle A slider inside solenoid valve moves depending on the input current. Controlling the oil flows the solenoid valve, adjusts the damping force.

9 ECS Slide motion depending on the current amount Oil passage is varied depending on the sliding motion Damping control

10 ECS Comparison of pneumatic circuit [Open Loop system] [Closed Loop system] - Intake & Exhaust the air in every cycle - Use low / high air pressure - Low leveling control speed - Low energy efficiency - Intake & Exhaust the air supplementary (Leakage, etc..) - Use high pressure - High leveling control speed - High energy efficiency (Higher than open loop type by 20 ~ 30%) - Reduced compressor operating time and volume

11 ECS Pneumatic components 1. Compressor 2. Air dryer 3. Throttle/Check valve 4,5 Reversing valve 6. Reservoir tank 7. Ambient valve Air spring 8. Solenoid valve block 9. Pressure sensor 10. Relief valve 11. Air Filling valve 12. Vacuum tube & Air filter 13. Outlet tube Air filling valve Reservoir tank Compressor Solenoid valve block

12 ECS Pneumatic circuit – System air filling 11. Air filling valve 6. Reservoir 5. Reversing valve 1. Compressor 4. Reversing valve 8. Solenoid valve block Air spring Reservoir Air filling valve Solenoid valve block Compressor Air spring

13 ECS Pneumatic circuit – Lifting level Reservoir Air filling valve Solenoid valve block Compressor Air spring 6. Reservoir 5. Reversing valve 1. Compressor 4. Reversing valve 8. Solenoid valve block Air spring

14 ECS Pneumatic circuit – Lowering level Air spring 4. Reversing valve 1. Compressor 2. Air dryer 3. Check valve 5. Reversing valve 6. Reservoir Reservoir Air filling valve Solenoid valve block Compressor Air spring

15 ECS Pneumatic circuit – Air filling (Supplementary) 13. Air filter 1. Compressor 2. Air Dryer 3. Check valve 5. Reversing valve 6. Reservoir Reservoir Air filling valve Solenoid valve block Compressor Air spring

16 ECS Pneumatic circuit – Air discharge (dryness) 6. Reservoir 5. Reversing valve 3. Throttle 2. Air dryer 4. Reversing valve 7. Ambient valve 13. Air filter Reservoir Air filling valve Solenoid valve block Compressor Air spring

17 ECS Inputs & Outputs Ambient Solenoid valve (1EA) Reversing solenoid valves (2EA) Height sensor (4EA) ECS mode switch G-sensor (3EA) Power (B+,IG) & G [CAN] Engine torque Brake S/W Steering Angle Sensor ABS/ESC Vehicle speed Vehicle height (for AFLS) Air spring solenoid valves (4EA) Compressor relay Damper SOL. valve (4EA) Pressure sensor Power supply to height sensor Power supply to pressure sensor ECS Control Module Door lock/unlock ADM * ADM: Assistant door module K-line Scanner Serial comm.

18 ECS PINDescription 1GND 4Not used 5+5V 6PWM signal [Connector layout] Height sensor Push manually to the ball stud Mounted by bolts Function - Detects the level (for vehicle level control) and the bouncing acceleration (for damping force control). Height Sensor (Front side)

19 ECS Height sensor signal [Max. Level] [Min. Level] Duty(-): 6% Frequency: 783Hz Max.: 4.63V Min.: 0.06V Duty(-): 97% Frequency: 785Hz Max.: 4.49V Min.: 0.06V CH4: Ground CH5: Sensor power CH5: Sensor signal CH4: Ground CH5: Sensor power CH5: Sensor signal

20 ECS Height sensor calibration - When? After air filling, height sensor or ECS control module replaced. Calibration procedure - IG ON (engine off or on) and keep Normal level. - Measure the height described in the right side picture. - Input the measured value to the scanner. Order: FL, FR, RL, RR - After calibration, confirm that the value is within the specification measuring the height again. Wheel center Top edge of wheel housing Height

21 ECS Function - It detects the bouncing acceleration of vehicle and installed at the front area (2EA) and rear area (1EA). - Receiving G-sensor output value, control module controls the solenoid valve in the CDC damper. G-sensor ECS control module Inside trunk Rear G-sensor G-sensor (FL)

22 ECS ECS switch Level control switch - Manual Up: Normal High - Manual Down: High Normal Damping control switch - Sport mode: high damping force (hard) - Normal mode: automatic damping force control Level control switch Damping control switch ECS Control module Level control switch K-line Comm. Ground Power Up/Down Damping control switch MICOM CDC sport CDC normal CDC S/W

23 ECS Sleep mode & Pre-run mode IG OFF 1min. Sleep mode ARM P After 2, 5, 10 hours DISARM ECSCM wake up Initial system checking (vehicle level, pneumatic circuit) Leveling compensation (if necessary) No manual level control Pre-run IG OFF Sleep mode IG OFF after 1min. W/O PIC W/ PIC Door Lock signal ADM Door Unlock signal

24 ECS Control mode This page is only for instructor note !

25 ECS Vehicle on the lifter Fully rebounded wheels on the lifter IG OFF60 sec.Use lifter ! Sleep mode

26 ECS High Level (Off-road) V < 70Km/h yes no Level up V > 70km/h For t > 10sec Automatic Level down Switch ON Level down Level change rejected Normal Level Low Level (Highway) V > 120km/h For t > 10sec Automatic Level up yes no yes V < 80km/h For t>5sec V < 40km/h Leveling control logic Automatic Level down Platform- Lift mode Automatic Level down Switch ON Automatic Level up

27 ECS Components: Motor, Dryer Function: - Compresses the air in the system - Transfers the air - Perform the air dryness using the dryer Connector for motor driving Reverse valve connector to solenoid valve block Dryer Motor Compressor to reservoir tank to air filter Relief valve Compressor relay

28 ECS To FR air spring (White) Connector To FL air spring (Red) To RL air spring (Yellow) To compressor (Blue) To air filter (Gray) To RR air spring (Green) Pressure sensor (embedded) 1. FL air spring SOL. 2. Ambient valve 3. RR air spring SOL. 4. RL air spring SOL. 5. Solenoid valve power 6. Solenoid valve power 7. Pressure sensor ground 8. FR air spring SOL. 9. Pressure sensor output 10. Pressure sensor power Components 5 solenoid valves, Pressure sensor, Air port Function Air port open and close depending on the solenoid valve operation. Solenoid valve block Connector layout

29 ECS Solenoid valve operation (Normal High) CH1: SOL. power CH2: FL SOL. CH3: FR SOL. CH4: RL SOL. CH5: RR SOL. (High Normal) CH1: SOL. power CH2: FL SOL. CH3: FR SOL. CH4: RL SOL. CH5: RR SOL.

30 ECS Pressure gauge (inlet): around 5~8bar 2. Pressure adjusting handle (set to 12bar) 3. Pressure gauge (outlet) 4. Filling nozzle: connected to the filling valve of vehicle 5. Filling hose 6. Air filter 7. Air tank drain valve 8. Water outlet (filtered water is automatically drained) 9. Inlet nozzle: connected to the air supply line in workshop 789 System air filling machine

31 ECS Reservoir Front air springRear air spring Filling valve System air filling condition - The vehicle must be lifted up. - External air supply pressure (from machine): 12 ± 2 Bar System air filling procedure Filling route

32 ECS The shape of Rear Air Spring bellow if buckling occurs Interference may occur ! When vehicle is on the ground with fully rebounded wheels. Cautions for system air filling - Air filling should be done on the lifter. Cautions of handling Rubber bellow Normal condition

33 ECS Grip ring Air tube connection O-ring Air tube (nylon) Air connector Do not reuse the air connector Recommended pliers for nylon tube cutting Mark on the tube Grip ring was protruded

34 ECS Service procedure

35 ECS Current data

36 ECS Air Spring Failsafe Mode All SOL. Comp. relay Height sensor Level control Restore condition (if failure repaired) AOFF Cannot be restored BOFF ONOFFNext IG cycle COFF ONOFFCurrent IG cycle DONOFFON Down leveling only (via ambient valve) Next IG cycle EON Down leveling onlyCurrent IG cycle FON Done by 3 height sensorsCurrent IG cycle GON Move to Normal level immediately and no more auto/manual level control at normal level Current IG cycle

37 ECS CDC damper Failsafe ModeLevel controlDefect item Restore condition (if failure repaired) A CDC Solenoid current: 0mA (Hard control) - CDC solenoid valve - Control Module Next IG cycle B CDC Solenoid current: 600mA (Fixing midway control) - Height sensor + volt Low or High - G-Sensor Next IG cycle C CDC Solenoid current: 600mA (Fixing midway control) - Height sensor + short to ground Current IG cycle DReserved Not Used Reserved E Not Used Reserved F CDC Solenoid current: 0mA (Hard control) - Battery voltage too low or high - One of height sensor error - Variant code error - CAN BUS Off DTC - CAN message failure (EMS,ESP or SAS) Current IG cycle