Heavy Duty Truck Electrical System - Hệ thống điện xe tải hạng nặng (Hyundai)

Terminal S Terminal B ① When driver sets the ignition key to the “START” position, ② When no magnetic operating sound is heard from start motor, a magnetic operating sound should be

Electrical System

Heavy Duty Truck

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STARTING SYSTEM

Magnetic switch

Pinion Overrunning clutch Motor

Structure of Starter

Yoke assembly

Brush holder

Armature

Magnetic switch assembly

Gear shaft

Overrunning clutch

Structure of Starter

Motor section generating power Magnetic switch section

Reduction gear Section

Reduction Gear Pinion

Armature

Overrunning

Clutch

Structure of Starter

Outer race Inner race Roller Spring

Overrunning clutch section

Structure of Starter

Analysis of Schematic Diagram

Heavy Duty Truck Starting System

Terminal S

Terminal B

① When driver sets the ignition key

to the “START” position,

② When no magnetic operating sound

is heard from start motor,

a magnetic operating sound should be heard.

connect the magnetic switch terminal B and terminal S directly by wiring.

Ground

Terminal S

③ If start motor is working, check the

power to the terminal S

If there is no power,

④ If there is no magnetic operating

sound even though terminal B and

terminal S are directly connected,

Check the wiring

among the battery, the fusible link,

between the ignition switch and start

motor terminal S.

repair the start magnetic switch or ground.

⑤ If the magnetic operating sound is

heard from the start motor, but the

start motor doesn’t work, connect the jump wire directly between the

battery terminal and start the motor terminal M

⑥ When the start motor runs,

⑦ If the start motor doesn’t work,

repair the battery terminal contact or magnetic switch

Repair the start motor or ground

CHARGING SYSTEM

ROTOR (field coil) : generates magnetic field

STATOR : generates electromotive force

RECTIFIER : rectifies electromotive force so generated

Structure of Alternator

REGULATOR : keeps generated voltage constant.

Analysis of Schematic Diagram

Heavy Duty Truck Charging System

② If the power is supplied, the rotor core becomes

a magnet So, it can be checked by screwdriver

or iron string If the rotor core doesn’t become a magnet,

it means alternator problems

Engine running condition

① Check that charging current is supplied to the battery from alternator B terminal while the engine is running

② Check the voltage at the alternator B terminal The voltage at the engine stop condition should be lower than at the engine running condition If the voltage is always the same, it means alternator problem.

Terminal B

Terminal B

Engine stop condition

< Output Side >

When a input side problem or alternator occurs, the

charging warning lamp turns on.

But in case of output side problem, the charging warning

lamp doesn’t come on

After starting engine, check if

the warning lamp turns off.

Check the battery.

Yes

Go to step 4

No Measure the battery voltage.

Standard : Above 24V

Inspect the bulb of the warning lamp.

Check the wiring between L terminal and the warning lamp.

Terminal IGN “ON” Idle

1 Connect an ammeter (min.100A)

between B terminal and wiring.

2 Turn off all electric load

after starting engine.

3 Keep the engine speed to

2500 ~3000 rpm.

4 Check if the output current

increases when turning

electric load on.

Step 5

No OK

Replace the alternator.

Check if the deflection of

drive belt is normal.

GAUGE & WARNING

SYSTEM

Analysis of Schematic Diagram

Heavy Duty Truck Gauge & Warning

System

Analysis of Schematic Diagram

Heavy Duty Truck(D6CA)

Gauge & Warning

System

HEAD LAMP

SYSTEM

Analysis of Schematic Diagram

Heavy Duty Truck Head Lamp System

ETACS

E lectronic T ime and A larm C ontrol S ystem

ETACS Functions

Mechanical Engine D6CA Intermittent wiper control

Washer related wiper

Seat belt warning timer

Mirror defogger timer

Central door lock / unlock control

Power window timer

Key hole illumination timer

Intake air preheating control

Coolant level warning control

WIPER & WASHER

SYSTEM

Wiper & Washer System

Heavy Duty Truck Wiper & Washer System

Wiper & Washer System

Check for input and output terminal of ETACS

Terminal No Description Operating Condition Value

M55-2

5 Washer S/W

Washer S/W “OFF” B+ V Washer S/W “ON” 0 V

M55-2

10 Intermittent Volume

Slow Position 2.5 V Fast Position 0 V

M55-1

1 Auto Parking

Wiper Stop B+ V Wiper Working 0 V

M551

12 Wiper Relay Control

Wiper Stop B+ V Wiper Working 0 V

MIRROR DEFOGGER

SYSTEM

Mirror Defogger System

Heavy Duty Truck Mirror Defogger System

Check for input and output terminal of ETACS

Terminal No Description Operating Condition Value

Mirror Defogger S/W “OFF” 5 V

Mirror Defogger S/W “ON” 0 V

18 Mirror Defogger Relay Control

Mirror Defogger Relay “OFF” B+ V

Mirror Defogger Relay “ON” 0 V

Mirror Defogger System

CENTRAL DOOR LOCK / UNLOCK

SYSTEM

Central Door Lock / Unlock System

Heavy Duty Truck Central Door Lock /

Unlock System

Check for input and output terminal of ETACS

Central Door Lock / Unlock System

Terminal No Description Operating Condition Value

M55-2

13 Door Lock S/W (LH)

Door Lock S/W “OFF” 5V

Door Lock S/W “ON” 0V

M55-2

14 Door Lock S/W (RH)

Door Lock S/W “OFF” 5V

Door Lock S/W “ON” 0V

M55-1

14 Door Lock Relay Control

Door Lock Relay “OFF” B+V

Door Lock Relay “ON” 0V

M55-1

15 Door Unlock Relay Control

Door Unlock Relay “OFF” B+V

Door Unlock Relay “ON” 0V

POWER WINDOW

SYSTEM

Power Window System

Heavy Duty Truck Power Window System

Check for input and output terminal of ETACS

Power Window System

Terminal No Description Operating Condition Value

13 Power Window Relay Control

Power Window Relay “OFF” B+V

Power Window Relay “ON” 0V

Coolant Level Warning

SYSTEM

Coolant Level Warning System

Heavy Duty Truck Coolant Level Warning

System

Check for input and output terminal of ETACS

Terminal No Name Operating Condition Value

11 Coolant Level Sensor

Coolant Level “Low” 30kΩ or more

Coolant Level “High” 30kΩ or less

M55-1

7 Engine Overheat IND & Buzzer Control

Engine overheat IND “OFF” B+V

Engine overheat IND “ON” 0V

Coolant Level Warning System

INTAKE AIR PREHEATING

SYSTEM

Intake Air Preheating System

Heavy Duty Truck Intake Air Preheating

System

Check for input and output terminal of ETACS

Intake Air Preheating System

Terminal No Name Operating Condition ValueM55-2

6 Ignition S/W

IG “OFF” 0V

IG “ON” B+VM55-2

7 Ignition S/W

IG “OFF” 0V

IG “START” B+VM55-2

8 Cold Start S/W

Cold Start S/W “OFF” 5V Cold Start S/W “ON” B+VM55-2

9 Water Temp Sensor

Engine “Cold” V

cold >

Vwarm Engine “Warm up”

M55-1

2 Preheater Relay Monitoring

Preheater Relay “OFF” 0V Preheater Relay “ON” B+VM55-1

3 Engine Running ALT “L”

Engine “STOP” 2.5V Engine “Running” B+VM55-1

8 Glow Indicator

Glow IND “OFF” B+V Glow IND “ON” 0VM55-1

17 Preheater Relay Control

Preheater Relay “OFF” 0V Preheater Relay “ON” B+V