Hyundai Elantra Owners and Service Manuals

Hyundai Elantra: Charging System / Alternator

Hyundai Elantra (CN7) 2021-2025 Service Manual / Engine Electrical System / Charging System / Alternator

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

1. Brush
2. Drive belt pully
3. Stator
4. Rotor

Specifications
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
14.55 ± 0.3V
Temperature Gradient
External mode
0 ± 2 mV / °C
Internal mode
-3.5 ± 2mV / °C

Schematic diagrams
Circuit Diagram

   
•
COM signal - When controlling the voltage generated, the ECM sends the target voltage data to the alternator via a PWM signal. (High Voltage : 4V, Low Voltage : 2V)
•
FR signal - The transistor activation signal inside the alternator monitors the voltage generated by the alternator to control the excitation current before it sends the FR signal to the ECM. (At certain RPM/electric loads, the FR duty can remain static. However, more often, the RPM, electric load, target voltage, etc. are always changing in the vehicle, so the FR must also change constantly)
•
L signal - Turns on the battery warning lamp on the dashboard when the battery charging system malfunctions. (Conditions for turning on the lamp - overcharge, over discharge, a field coil blown inside the alternator)
•
B+ terminal - The output voltage from the generator travels to the battery via the B+ terminal.
Repair procedures
Removal
1.
Turn ignition switch OFF and disconnect the negative (-) battery cable.
2.
Remove the drive belt tensioner.
(Refer to Engine Mechanical System - "Drive Belt Tensioner")
3.
Remove the drive belt.
(Refer to Engine Mechanical System - "Drive Belt")
4.
Remove return hose & pipe braket bolt (A).
Tightening torque : 9.8 - 11.8 N.m (1.0 - 1.2 kgf.m, 7.2 - 8.7 lb-ft)

5.
Disconnect the cable (C) from alternator "B" terminal after disconnect the compressor connector (A) and the alternator connector (B).
Tightening torque : 9.8 - 11.8 N.m (1.0 - 1.2 kgf.m, 7.2 - 8.7 lb-ft)

6.
Remove the alternator (B) after loosening the mounting nuts (A).
Tightening torque : 40.03 - 63.7 N.m (5.0 - 6.5 kgf.m, 36.1 - 47.0 lb-ft)

Installation
1.
Install in the reverse order of removal.
Disassembly
1.
Remove the rear cover (A).

2.
Remove the mounting bolts and the regulator assembly (A).
   
•
When removing take care not to damage the surrounding parts.

3.
Remove the OAP cap (A).

   
•
When installing, replace with new OAP cap.
4.
Remove the OAP pulley (A) by using the SST (09373-27000).

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

6.
Remove the through bolts (A).

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

Reassembly
1.
Reassemble in the reverse order of disassembly.
Inspection
[Rotor]
1.
Check that there is continuity between the slip rings (C).

2.
Check that there is no continuity between the slip ring (C) 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.

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