Hyundai Sonata LF: Charging System / Alternator Repair procedures

Hyundai Sonata LF 2014-2019 Service Manual / Engine Electrical System / Charging System / Alternator Repair procedures

Removal
1.
Disconnect the battery negative terminal.
2.
Loosen the mounting bolts (A) and then, turn the adjusting bolt (B) clockwise to loosen tension.

3.
Remove the drive belt (A).

4.
Disconnect the air compressor connector (A) and the alternator connector (B), and remove the cable from alternator "B" terminal (C).

5.
Remove the alternator (A).

Installation
1.
Install in the reverse order of removal.
2.
Adjust the alternator belt tension after installation.
(Refer to Engine Mechanical System - "Drive Belt")
Alternator installation bolt:
[12mm (0.47in) bolt]
19.6 ~ 26.5 Nm (2.0 ~ 2.7 kgf.m, 14.5 ~ 19.5 Ib-ft)
[14mm (0.55in) bolt]
29.4 ~ 41.2 Nm (3.0 ~ 4.2 kgf.m, 21.7 ~ 30.4 Ib-ft)
Disassembly
1.
Remove the rear cover (A) after removing nuts.

2.
Remove the mounting bolts (A) and the brush holder assembly (B).

3.
Remove the slip ring guide (A) after pulling it.

4.
Remove the OAD(Overrunning Alternator Decoupler) cap.
   
•
When installing, replace with new OAD cap.
5.
Remove the OAD(Overrunning Alternator Decoupler) pulley (A) using the special tool.

6.
Unsolder the 3 stator leads (A).

7.
Remove the 4 through bolts (A).

8.
Disconnect the rotor (A) and bracket (B).

Reassembly
1.
Reassemble in the reverse order of disassembly.
   
•
When reassembling OAD pulley, replace with new OAD 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.

    Alternator 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...

    Battery Description and Operation

    Description [AGM Battery] AGM battery is used for especially heavy load on the vehicle network depending on equipment and requirements. AGM stands for Absorbent Glass Material Battery; that is absorbent glass fibre fleece...

    Other information:

    Hyundai Sonata LF 2014-2019 Service Manual: Alternator 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 or higher, low voltage: 2V or lower) • 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...

    Hyundai Sonata LF 2014-2019 Service Manual: CVVT Oil Control Valve (OCV) Description and Operation


    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...

    Categories

    read more

     
    Copyright © 2026 www.hsonatalf.org