Hyundai Accent (HC): Engine Electrical System / Cruise Control System

Hyundai Accent (HC) (2017 - 2022) Service Manual / Engine Electrical System / Cruise Control System

Contents:

Description and Operation
Schematic Diagrams
Troubleshooting
Cruise Control Switch

Description and Operation

- Cruise Control The cruise control system is engaged by the cruise "ON/OFF" main switch located on the right-hand side of steering wheel column. The system has the capability to cruise, coast, accelerate and resume speed.It also has a safety interrupt, engaged upon depressing brake or shifting select lever.The ECM is the control module for this system. The main components of cruise control system are mode control switches, transmission range switch, brake switch, vehicle speed sensor, ECM and ETS motor that connect throttle body. The ECM has a low speed limit that prevents system engagement below a minimum speed of 40km/h (25mph).The operation of the controller is controlled by mode control switches located on steering wheel.Transmission range switch and brake switch are provided to disengage the cruise control system. The switches are on brake pedal bracket and transmission. When the brake pedal is depressed or select lever shifted, the cruise control system is electrically disengaged and the throttle is returned to the idle position.Cruise Main Switch (ON/OFF) The cruise control system is engaged by pressing the cruise "ON/OFF" main switch. Pressing the cruise "ON/OFF" main switch again releases throttle, clears cruise memory speed, and puts vehicle in a non-cruise mode.Set / Coast Switch (SET/–) The "SET/–" switch located on right-hand side of steering wheel column, has two functions.The set function - Push the "SET/–" switch and release it at the desired speed. The SET indicator light in the instrument cluster will illuminate. Release the accelerator pedal. The desired speed will automatically be maintained.The coast function - Push the "SET/–" switch and hold it when the cruise control is on. The vehicle will gradually slow down. Release the switch at the desired speed. The desired speed will be maintained.Push the "SET/–" switch and release it quickly. The cruising speed will decrease by 2.0km/h (1.2mph).Resume / Accel Switch (RES/+) The "RES/+" switch located on right-hand side of steering wheel column, has two functions.The resume function - If any method other than the cruise "ON/OFF” main switch was used to cancel cruising speed temporarily and the system is still activated, the most recent set speed will automatically resume when the "RES/+" switch is pushed. It will not resume, however, if the vehicle speed has dropped below approximately 40km/h (25mph).The accel function - Push the "RES/+" switch and hold it when the cruise control is on. The vehicle will gradually accelerate. Release the switch at the desired speed. The desired speed will be maintained.Push the "RES/+" switch and release it quickly. The cruising speed will increase by 2.0km/h (1.2mph).Cancel Switch (CANCEL) The cruise control system is temporarily disengaged by pushing the "CANCEL" switch.Cruise speed canceled by this switch can be recovered by pushing the "RES/+" switch.

Schematic Diagrams

- System Block Diagram

Component Parts and Function Outline

Component part		Function
Vehicle-speed sensor, ESP/ABS Control Module		Converts vehicle speed to pulse.
ECM		Receives signals from sensor and control switches.
Cruise control indicator		Illuminate when CRUISE main switch is ON (Built into cluster)
Cruise Control switches	CRUISE switch	Switch for automatic speed control power supply.
	RES+ switch	Controls automatic speed control functions by Resume/Accel switch (Set/Coast switch)
	SET- switch
Cancel switches	Cancel switch	Sends cancel signals to ECM.
	Brake-pedal switch
	Transaxle range switch (A/T)
ETC motor		Regulates the throttle valve to the set opening by ECM.

* ETC Motor : Electronic Throttle Control Motor

Troubleshooting

- Trouble Symptom Charts

Trouble Symptom 1

Trouble Symptom 2

Trouble symptom	Probable cause	Remedy
The set vehicle speed varies greatly upward or downward "Surging" (repeated alternating acceleration and deceleration) occurs after setting	Malfunction of the vehicle speed sensor circuit	Repair the vehicle speed sensor system, or replace the part
	Malfunction of ECM	Check input and output signals at ECM

Trouble Symptom 3

Trouble symptom	Probable cause	Remedy
The CC system is not canceled when the brake pedal is depressed	Damaged or disconnected wiring of the brake pedal switch	Repair the harness or replace the brake pedal switch
	Malfunction of the ECM signals	Check input and output signals at ECM

Trouble Symptom 4

Trouble symptom	Probable cause	Remedy
The CC system is not canceled when the shift lever is moved to the "N" position (It is canceled, however, when the brake pedal is depressed)	Damaged or disconnected wiring of inhibitor switch input circuit	Repair the harness or repair or replace the inhibitor switch
	Improper adjustment of inhibitor switch
	Malfunction of the ECM signals	Check input and output signals at ECM

Trouble Symptom 5

Trouble symptom	Probable cause	Remedy
Cannot decelerate (coast) by using the "SET/–" switch	Temporary damaged or disconnected wiring of "SET/–" switch input circuit	Repair the harness or replace the "SET/–" switch
Cannot decelerate (coast) by using the "SET/–" switch	Malfunction of the ECM signals	Check input and output signals at ECM

Trouble Symptom 6

Trouble symptom	Probable cause	Remedy
Cannot accelerate or resume speed by using the "RES/+" switch	Damaged or disconnected wiring, or short circuit, or "RES/+" switch input circuit	Repair the harness or replace the "RES/+" switch
	Malfunction of the ECM signals	Check input and output signals at ECM

Trouble Symptom 7

Trouble symptom	Probable cause	Remedy
CC system can be set while driving at a vehicle speed of less than 40km/h (25mph), or there is no automatic cancellation at that speed	Malfunction of the vehicle-speed sensor circuit	Repair the vehicle speed sensor system, or replace the part
	Malfunction of the ECM signals	Check input and output signals at ECM

Trouble Symptom 8

Trouble symptom	Probable cause	Remedy
The cruise main switch indicator lamp does not illuminate (although CC system is normal)	Damaged or disconnected bulb of cruise main switch indicator lamp	Repair the harness or replace the part.
	Harness damaged or disconnected	Repair the harness or replace the part.

Cruise Control Switch

- Components

1. Remote control switch (LH)
2. Remote control switch (RH)

- Circuit Diagram

- Removal

1.Turn the ignition switch OFF and disconnect the battery negative (-) cable.

2.Remove the steering wheel assembly.

3.Remove the screws from the steering back cover (A).

4. Remove the steering remote control connector (A).

5.Remove the steering remote control (A) after loosening the screws.

- Installation

1. Install in the reverse order of removal.

- Inspection

1.Install the steering wheel remote controll and cover after connecting the connector.

2. Install the steering wheel and driver airbag module.

3.Connect the negative (-) battery terminal.

4.Measure the resistance between terminals on the control switch when each function switch is ON (and switch is depressed).

Switch	Connector terminal	Resistance (± 5%)
CANCEL	2 - 5	390 Ω
SET (-)	2 - 5	610 Ω
RES (+)	2 - 5	910 Ω
CRUISE	2 - 5	1.38 kΩ

Starter

Emission Control System

Other information:

Hyundai Accent (HC) (2017 - 2022) Service Manual: General Safety Information and Caution

- Instructions • The R-1234yf liquid refrigerant is flammable gas. The gas reduces oxygen available for breathing and causes asphyxiation in high concentrations. The victim will not realize that he/she is suffocating. • Inhalation may cause central nervous system effects and may cause drowsiness and dizziness. • Ingestion may cause gastrointestinal discomfort.

Hyundai Accent (HC) (2017 - 2022) Service Manual: CVVT & Camshaft

- Description Continuous Variable Valve Timing (CVVT) system advances or retards the valve timing of the intake and exhaust valve in accordance with the ECM control signal which is calculated by the engine speed and load.By controlling CVVT, the valve over-lap or under-lap occurs, which makes better fuel economy and reduces exhaust gases (NOx, HC) and improves engine performance through reduction of pumping loss, internal EGR effect, improvement of combustion stability, improvement of volumetric efficiency, and increase of expansion work.

Description and Operation
Schematic Diagrams
Troubleshooting
Cruise Control Switch