Hyundai Accent (HC): Engine Electrical System / Charging System

Contents:

• Description and Operation
• Repair procedures
• Troubleshooting
• Alternator
• Battery
• Battery Sensor

Description and Operation

- Description The charging system included a battery, an alternator with a built-in regulator, and the charging indicator light and wire.The Alternator has eight built-in diodes, each rectifying AC current to DC current.Therefore, DC current appears at alternator "B" terminal.In addition, the charging voltage of this alternator is regulated by the battery voltage detection system.The alternator is regulated by the battery voltage detection system. The main components of the alternator are the rotor, stator, rectifier, capacitor brushes, bearings and V-ribbed belt pulley. The brush holder contains a built-in electronic voltage regulator.Alternator Management Syste Alternator management system controls the charging voltage set point in order to improve fuel economy, manage alternator load under various operating conditions, keep the battery charged, and protect the battery from over-charging. ECM controls generating voltage by duty cycle (charging control, discharging control, normal control) based on the battery conditions and vehicle operating conditions.The system conducts discharging control when accelerating a vehicle. Vehicle reduces an alternator load and consumes an electric power form a battery.The system conducts charging control when decelerating a vehicle. Vehicle increases an alternator load and charges a battery.

Repair procedures ➤

Troubleshooting ➤

Alternator ➤

Battery ➤

Battery Sensor

- Description Vehicles have many control units that use more electricity. These units control their own system based on information from diverse sensors. It is important to have a stable power supply as there diverse sensors giving a variety of information. Battery sensor (A) is mounted on battery (-) terminal. It transmits battery voltage, current, temperature information to ECM. ECM controls generating voltage by duty cycle based on these signals.

   

• When battery sensor signal fault occurs, check whether the parasitic draw is not abnormal (Refer to vehicle parasitic current inspection)

   

It takes a few hours for a new battery sensor to detect the battery state correctly.Perform the following process after replacing the battery sensor.

1)Turn the ignition switch ON/OFF.

2)Leave the vehicle in parking mode for more than 4 hours.

3)After 4 hours, check that the SOC (State of charge) of battery is displayed on GDS properly.

   

For the vehicle equipped with a battery sensor, be careful not to damage the battery sensor when the battery is replaced or recharged.

• When replacing the battery, it should be the same (type, capacity and brand) as originally installed on your vehicle. If a battery of a different type is installed, the battery sensor may recognize the battery to be abnormal.

• When installing the ground cable on the negative post of battery, tighten the clamp with specified torque of 3.9 - 5.9 N.m (0.4 - 0.6 kgf.m, 3.0 - 4.4 lb-ft). An excessive tightening torque can damage the PCB internal circuit and the battery terminal.

• When recharging the battery, ground the negative terminal of the booster battery to the vehicle body.

- Removal and Installation

1.Turn the ignition switch OFF.

2.Disconnect the battery negative (-) terminal (A).

Battery negative (-) terminal tightening nut :8.0 - 10.0 N.m (0.8 - 10.0 kgf.m, 5.9 - 7.4 lb-ft)

3.Disconnect the battery sensor connector (A).

4.Remove the battery sensor by loosening the mounting bolts (B).

Battery sensor cable mounting bolt (Chassis ground) :27.0 - 33.0 N.m (2.8 - 3.4 kgf.m, 19.9 - 24.3 lb-ft)

5.Install in the reverse order of removal.

   

• For the vehicle equipped with a battery sensor, be careful not to damage the battery sensor when the battery is replaced or recharged.

1)When replacing the battery, it should be same one (type, capacity and brand) that is originally installed on your vehicle. If a battery of a different type is replaced, the battery sensor may recognize the battery to be abnormal.

2)When installing the ground cable on the negative post of battery, tighten the clamp with specified torque. An excessive tightening torque can damage the PCB internal circuit and the battery terminal.

3)When recharging the battery, ground the negative terminal of the booster battery to the vehicle body.

- Battery Sensor Recalibration Procedure After reconnecting the battery negative cable, AMS function does not operates until the system is stabilized, about 4 hours. If disconnecting the negative (-) battery cable from the battery during repair work for the vehicle equipped with AMS function, Battery sensor recalibration procedure should be performed after finishing the repair work.

1.Turn the Iginition switch ON and OFF.

2.Park the vehicle for about 4 hours with the hood and all doors closed.