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

- Troubleshooting

   

• Be careful not to short-circuit the wiring by the body or other wirings.

• In case of discharging problem, measure dark current at all times.(Refer to Charging System - "Dark Current Inspection")

• When checking the alternator main fuse, perform continuity test and voltage test between terminals as well as visual check to confirm normal operation.

• When checking the ground, repair or replace after inspecting for defective ground cable, defective installation or defective contact due to foreign object.

• It is not recommended to use non-authentic parts as installing non-authentic parts may cause malfunction of charging system.

• Be careful as misassembly may cause short-circuit of wiring, which may result in battery discharge.

• As it will reset and appear as normal if the battery negative (-) terminal is disconnected while measuring dark current, measure by using a hook meter without disconnecting the negative (-) terminal.

• Note that there may be various phenomenons / possible causes / repair measures apart from above.

• For more effective repairs, refer to DTC guide and ETM.

Symptom	Suspected Area	Remedy
Charging warning lamp does not turn on during IG ON.	Broken alternator main fuse	Inspect / Repair / Replace fuse.
	Broken instrument cluster fuse	Inspect / Repair / Replace fuse.
	Broken instrument cluster internal bulb	Inspect / Repair / Replace instrument cluster.
	Defective connection of wiring connector	Inspect / Repair / Replace wiring connection.
	Defective voltage regulator or alternator	Inspect / Repair / Replace voltage regulator or alternator.
	Defective connection of battery terminal	Inspect tightening of (+) and (-) battery terminals to specified torque.
	Communication error	Inspect wiring between regulator and ECM.
		Inspect transmission signal of ECM.
		Inspect / Repair / Replace alternator if the wiring and ECM are normal.
Charging warning lamp does not turn off during engine running.	Worn drive belt or lack of tension	Inspect / Repair / Replace drive belt.
	Defective connection, corroded or worn battery cable	Inspect connection of battery cable and Inspect / Repair / Replace cable.
	Broken alternator main fuse	Inspect / Replace alternator main fuse or battery cable.
	Defective voltage regulator or alternator	Inspect / Replace voltage regulator or alternator.
	Defective wiring	Inspect / Replace wiring.
	Defective instrument cluster	Inspect / Replace instrument cluster
	Slip in alternator pulley	Inspect / Replace alternator pulley.
		Adjust tension / Replace drive belt.
	Defective connection of battery terminal	Inspect tightening of (+) and (-) battery terminals to specified torque.
Charging warning lamp turns on.	Slip, worn or lack of tension in drive belt	Adjust tension / Replace drive belt.
		Inspect / Replace auto tensioner (only for auto tensioner type).
	Error in Alternator Management System (AMS) voltage	Inspect battery sensor connecting harness and connection with body.
	Error in battery sensor	Inspect / Repair / Replace battery sensor.
	Short between battery sensor wiring and body	Inspect / Repair / Replace battery sensor.
	Defective alternator L terminal output power	Inspect / Repair / Replace alternator or regulator.
	Degradation due to defective contact of battery (+) terminal	Check tightening to specified torque / Inspect / Repair / Replace battery wiring.
	Short in alternator connecting extension connector internal pin	Inspect / Repair / Replace wiring.
	Short circuit between body and mission ground	Inspect / Repair / Replace ground.
	Communication error	Inspect / Repair / Replace wiring between regulator and ECM.
		Inspect transmission signal of ECM.
		Inspect / Repair / Replace alternator if wiring and ECM are normal.
	Short in the middle of connection to alternator L terminal (L terminal applied vehicle model)	Inspect / Repair / Replace wiring.
	Drive belt rotation stops due to slip in crankshaft damper pulley or defective pulley.	Inspect or replace crankshaft damper pulley / Inspect, repair or replace drive belt tensioner bearing.
	Slip, worn or lack of tension in drive belt	Adjust tension / Inspect / Repair / Replace drive belt.
	Defective voltage regulator	Inspect / Repair / Replace voltage regulator.
	Defective alternator	Inspect / Repair / Replace alternator.
	Broken alternator main fuse	Inspect / Repair / Replace alternator main fuse or battery wiring cable.
	Defective ground	Inspect / Repair / Replace ground.
	Discharged battery	Adjust tension / Inspect / Repair / Replace drive belt.
		Inspect / Repair / Replace wiring connection.
		Inspect / Repair / Replace alternator main fuse.
		Inspect / Repair / Replace alternator.
		Inspect / Repair / Replace voltage regulator.
		Inspect / Repair / Replace battery unit.
		Inspect for dark current / Repair / Replace.
		Learn / Inspect / Repair / Replace battery sensor.
		Inspect for short / Repair / Replace battery cable.
		Inspect / Repair / Replace ECM.
		Inspect / Repair / Replace body electrical related parts.
		Inspect / Repair / Replace installation status of alternator connector.
		Inspect / Repair / Replace tightening of (+) and (-) battery terminals to specified torque.
Swollen battery	Defective battery	Inspect / Replace battery.
	Defective voltage regulator or alternator	Inspect / Repair / Replace voltage regulator or alternator.
	Defective charging related parts or wiring	Inspect / Repair / Replace charging related parts and wiring.
After inspection, repair or replace related parts in case of malfunction.

Alternator

- Specification

Item		Specification
Rated voltage		13.5V, 130A
Speed in use		1,000 - 18,000 rpm
Voltage regulator		IC Regulator built-in type
Regulator Setting Voltage	External mode	10.6 - 16 ± 0.3V
	Internal mode	14.5 ± 0.3V
Temperature Gradient	External mode	0 ± 2 mV / °C　
	Internal mode	-3.5 ± 2 mV / °C

- Description 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, capacitor brushes, bearings and V-ribbed belt pulley. The brush holder contains a built-in electronic voltage regulator.

1. Brush
2. Pulley
3. Rotor
4. Stator

- Circuit Diagram

   

• COM signal - When controlling the voltage generated, the ECM sends the target voltage data to the alternator via a LIN signal.

• B+ terminal - The output voltage from the generator travels to the battery via the B+ terminal.

- Removal and Installation

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

2.Remove the drive belt.(Refer to Engine Mechanical System - "Drive Belt")

3.Disconnect the air compressor connector (A) and the alternator connector (B), and remove the cable (C) from alternator "B" terminal.

Alternator B-terminal cable mounting nut :18.6 - 24.5 N.m (1.9 - 2.5 kgf.m, 4.1 - 5.5 Ib-ft)

4.Loosen the mounting bolts (A).

Alternator lower bolt :29.4 - 41.2 N.m (3.0 - 4.2 kgf.m, 21.7 - 30.4 Ib-ft)

5.Remove the alternator (A).

6.Install in the reverse order of removal.

- Disassembly

1.Remove the rear cover (A).

2.Remove the mounting bolts (A) and the regulator assembly.

   

• When installing, replace with new OAP cap.

3.Remove the OAP cap.

   

• When installing, replace with new OAP cap.

4.Remove the OAP pulley (A) using the special tool (09373-27000).

5.Remove the rectifier assembly (A) after disconnecting the stator leads.

6.Remove the 4 through bolts (A).

7.Disconnect the rotor (A) and bracket (B).

8.Install in the reverse order of removal.

- Reassembly

1.Reassemble in the reverse order of disassembly.

   

• When reassembling OAP pulley, replace with new OAP cap.

- Inspection [Rotor]

1.Check that there is continuity between the slip rings (C).

2.Check that there is no continuity between the slip rings and the rotor (B) or rotor shaft (A).

3.If the rotor fails either continuity check, replace the alternator.

[Stator]

1.Check that there is continuity between each pair of leads (A).

2.Check that there is no continuity between each lead and the coil core.

3.If the coil fails either continuity check, replace the 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.