Hyundai: Engine D4FA. Manual — part 109
DIESEL CONTROL SYSTEM
FLA -307
DTC P0562 SYSTEM VOLTAGE LOW
COMPONENT LOCATION
ED191A4D
Alternator
EGNG003M
GENERAL DESCRIPTION
E97DDA44
Normally, battery voltage fluctuates from 11.5V to 14.5V. Especially at cranking, voltage can drop to 9.8V. Therefore,
actuators which require 12V power supply meet fluctuation of power by 5V.A little change of voltage supply can shift
controlling characteristic of actuators, such as injectors, Rail pressure regulator valve and EGR actuator, which should be
controlled delicately. To correct controlling characteristic change arrised from voltage fluctuation, ECM performs actuator
operating correction according to voltage change as detecting battery voltage change.
DTC DESCRIPTION
E513ABDB
P0562 is set when battery voltage below 6V is detected for more than 5 sec. Check charging system.(charging circuit,
alternator component)
▶ ECM senses battery voltage as monitoring the voltages in ECM(C101-2) connector terminal 1,3,5 which are transmitted
from main relay.
DTC DETECTING CONDITION
E1936633
Item
Detecting Condition
Possible Cause
DTC Strategy
• Voltage monitoring
Enable Conditions
• IG KEY "ON"
ThresholdValue
• when battery voltage is below 6V
DiagnosticTime
• 5 sec.
Fuel Cut
NO
EGR Off
NO
Fuel Limit
NO
Fail Safe
MIL
NO
• Charging circuit
• Alternator component
FLA -308
FUEL SYSTEM
SCHEMATIC DIAGRAM
E9C22A8B
1
1
4
5
2
2
3
4
30A ECU A FUSIBLE LINK
*
Hot at all times
Main relay control
*
Main relay coil power
C101-2 terminal 72
30A ECU A FUSIBLE LINK
5
Power supply to
ECM, Sensor, Actuator
C101-2 terminal 1,3,5 etc.
5. Main relay power
72. Main relay control
28. IG KEY ON signal
Hot at all times (30A ECU A FUSIBLE LINK)
ON/START power ( E/R FUSE & RELAY BOX 10A ECU FUSE)
1. Main relay power
3. Main relay power
C101-2 ECM
C101-1 ECM
E63 Main relay
10A ECU D
20A ECU C
15A INJ
10A SNSR
Throttle flap actuator
Brake S/W
O2 sensor heater
EGR actuator
VGT actuator
CMPS
Glow plug relay
PTC heater relay
-
+
E102 Alternator
Cluster(Changing lamp)
Lamp 2
M09-2
6
11
M09-1
I/P JUNTION BOX
ON/START power (I/P JUNTION BOX 10A Cluster FUSE)
M09-2
Cluster
M09-1
Cluster
E102
lternator
2
*
4
5
6
7
8
11
12
13
14
15
16
17
18
19
20
*
*
*
* *
1
2
3
4
5
6
7
9
10
11
12
*
C101-2 ECM
C101-1 ECM
1
30 29
31
32
38
39
36
37
35
33
34
40
42 41
46 45 44 43
48 47
50 49
2
3
4
6
5
8
7
12 11 10 9
13
14
15
18 17
19
16
22
25
27 26
23
20
21
24
28
51
75 74
53 52
73
79 78 77 76
80
81
83 82
84
86 85
87
89 88
90
92 91
93
94
57
69 68
70
71
64
54
55
56
61
58
59
60
63 62
65
66
67
72
[CIRCUIT DIAGRAM]
[HARNESS CONNECTOR]
[CONNECTOR INFORMATION]
Terminal
Terminal
Connected to
Connected to
Function
1
2
4
3
6
5
8 7
12
13
16
17
18
23 22
20
21
19
27 26 25 24
28
29
30
14
9
10
11
15
33 32 31
34
37
41
42
40 39 38
35
36
43
44
47 46
49 48
50
53
56
58 57
54
51
52
55
59
60
45
EGNG003N
DIESEL CONTROL SYSTEM
FLA -309
SIGNAL WAVEFORM AND DATA
E33B9B53
Fig.1
Fig.1) This is alternator charging waveform during engine running. Check if battery voltage drops dramatically as turning on
the electrical device such as head lamp, defogger and A/C.
EGNG003O
MONITOR SCANTOOL DATA
E5CB078B
1.
Connect scantool to Data Link Cable. (DLC)
2.
Warm engine up to normal operating temperature.
3.
Turn "OFF" electrical devices and A/C.
4.
Monitor "BATTERY VOLTAGE" parameter on the Scantool.
specification :12.5V~14.5V at idle without any load(800RPM)
Fig.1
Fig 1) "BATTERY VOLTAGE" data at idle after warming engine up.
Check if the symptoms listed below occur as checking if battery voltage drops dramatically when turning on the electrical devices.
EGNG003P
※ The vehicles with the alternator of poor charging efficiency
1. Lamps are dim at idle, while lamps are bright at acceleration.
2. Intermitently RPM drops excessively or engine shut down at low RPM close to idle state at times.
FLA -310
FUEL SYSTEM
3. Smooth cranking happens rarely. (Warning lamps in cluster turn dimmer excessively at cranking and poor cranking
happen.)
4. Charging lamp turns on during driving.
TERMINAL AND CONNECTOR INSPECTION
EB2E7390
1.
Electrical systems consist of a lot of harness and connectors, poor connection of terminals can cause various prob-
lems and damge of component.
2.
Perform checking procedure as follows.
1)
Check damage of harness and terminals : Check terminals for contact resistance, corrosion and deformation.
2)
Check connecting condition of ECM and component connector : Check terminal seperation, damage of locking
device and connecting condition between terminal and wiring.
NOTE
Disconnect the pin which requires checking at male connector and insert it to the terminal at female connector or
checking connecting condition. ( after checking, reconnect the pin at correct position. )
3.
Is the problem found?
YES
▶ Repair the trouble causing part and go to "Verification of Vehicle Repair".
NO
▶ Go to "Power Circuit Inspection".
POWER CIRCUIT INSPECTION
E58BB543
1.
Check power supply in alternator connector
1)
IG KEY "ON", Turn engine "OFF".
2)
Disconnect alternator connector.
3)
Measure the voltage of terminal 2 of alternator connector.
Specification : 10.5V~12.0V
4)
Is the measured voltage within the specification?
YES
▶ Go to "2. Check charging lamp operation".
NO
▶ When no voltage is detected at terminal 2.
Check charging lamp on cluster and charging lamp resistor and repair the open in related circuit and go to "Ver-
ification of Vehicle Repair".
2.
Check charging lamp operation
1)
IG KEY "ON", ENGINE "OFF".
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