– Input of signal from the wheel speed sensors attached to each wheel.
– Control of braking force.
– Failsafe function.
– Self diagnosis function.
– Interface with the external diagnosis tester.
– Brake tube length from Master cylinder port to HECU inlet port should be max. 1m
– The position should not be close to the engine block and not lower than the wheel.
– OvervoltageWhen overvoltage is detected(above 16.8 V), the ECU switches off the valve relay and shuts down the system.When voltage is returned to operating range, the system goes back to the normal condition after the initialization phase.
– UndervoltageIn the event of undervoltage(below 9.3 V), ABS control shall be inhibited and the warning lamp shall be turned on.When voltage is returned to operating range, the warning lamp is switched off and ECU returns to normal operating mode.
1.ABS Warning LampThe active ABS warning lamp indicates the selftest 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.
2.EBD/Parking brake Warning LampThe active EBD warning lamp indicates the selftest 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.
1.Normal Braking without ABS
Inlet valve (IV) | Outlet valve (OV) | Return pump | |
Operation | Open | Close | OFF |
• IV : Inlet Valve
• OV : Outlet Valve
• RL : Rear left wheel
• FR : Front right wheel
• FL : Front left wheel
• RR : Rear right wheel
• RP : Return pump
2.Decrease Mode
Inlet valve (IV) | Outlet valve (OV) | Return pump | |
Operation | Close | Open | ON (Motor speed control) |
• IV : Inlet Valve
• OV : Outlet Valve
• RL : Rear left wheel
• FR : Front right wheel
• FL : Front left wheel
• RR : Rear right wheel
• RP : Return pump
3.Hold Mode
Inlet valve (IV) | Outlet valve (OV) | Return pump | |
Operation | Close | Close | ON (Motor speed control) |
• IV : Inlet Valve
• OV : Outlet Valve
• RL : Rear left wheel
• FR : Front right wheel
• FL : Front left wheel
• RR : Rear right wheel
• RP : Return pump
4.Increase Mode
Inlet valve (IV) | Outlet valve (OV) | Return pump | |
Operation | Open | Close | ON (Motor speed control) |
• IV : Inlet Valve
• OV : Outlet Valve
• RL : Rear left wheel
• FR : Front right wheel
• FL : Front left wheel
• RR : Rear right wheel
• RP : Return pump
Hyundai Accent (HC) (2017 - 2022) Service Manual: Timing Chain
- Removal 1.Disconnect the battery negative terminal. 2.Turn the crankshaft damper pulley clockwise, and align its groove with the timing mark of the timing chain cover. 3.Remove the timing chain cover.(Refer to Timing System - "Timing Chain Cover") 4.Remove the cam to cam guide (A). 5.Remove the timing chain tensioner (A) and remove the timing chain tensioner arm (B).Hyundai Accent (HC) (2017 - 2022) Service Manual: Troubleshooting
- Troubleshooting SymptomSuspect areaRemedy Engine misfire with abnormal internal lower engine noises.Loose or improperly installed drive plate.Repair or replace the drive plate as required. Worn piston rings.(Oil consumption may or may not cause the engine to misfire.)Inspect the cylinder for a loss of compression .Repair or replace as required.