Hyundai: Engine D4FA. Manual — part 117
DIESEL CONTROL SYSTEM
FLA -339
DTC P0646 A/C CLUTCH RELAY CONTROL CIRCUIT LOW
COMPONENT LOCATION
EEA5390B
A/C clutch
EGNG014U
GENERAL DESCRIPTION
E631C372
Aircon Relay which is controled by ECM supplies and cut electrical power to Aircon compressor. ECM activates or deac-
tivates Aircon Relay based on inputted signal such as aircon switch siganl and Aircon switch signal.As controlling Aircon
Relay, ECM 1)turns OFF aircon compressor at rapid acceleration to retain suffiecient capacity for acceleration, 2)actively
performs idle-up function to cope with the change of engine load which happens at aircom compressor operation.
DTC DESCRIPTION
E0C754B5
P0646 is set when ’0A’ is detected in Aircon relay control circuit for more than 1 sec.. This code is due to open or short
to ground in Aircon relay control circuit or internal open in relay component.
DTC DETECTING CONDITION
EFF203A7
Item
Detecting Condition
Possible Cause
DTC Strategy
• Voltage monitoring
Enable Conditions
• IG KEY "ON"
ThresholdValue
• Short to GND, Wiring open
DiagnosticTime
• 1.0 sec.
Fuel Cut
NO
EGR Off
NO
Fuel Limit
NO
Fail Safe
MIL
NO
• A/C relay circuit
• A/C relay component
FLA -340
FUEL SYSTEM
SCHEMATIC DIAGRAM
E4B2E0FC
1
1
3
2
2
5
3
4
10A A/C FUSE (Hot at all times)
10A SNSR FUSE (Main relay power)
Relay power(INPUT)
Relay power(OUTPUT)
Relay coil power
*
A/C compressor
*
5
Relay control
C101-2 terminal 70
70. A/C relay control
10A SNSR FUSE (Main relay power)
10A A/C FUSE (Hot at all times)
A/C compressor
C101-2 ECM
E66 A/C relay
C101-2 ECM
C101-1 ECM
E66 A/C relay
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
2
5 * 3
1
[CIRCUIT DIAGRAM]
[HARNESS CONNECTOR]
[CONNECTOR INFORMATION]
Terminal
Terminal
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
EGNG001B
MONITOR SCANTOOL DATA
E4E33BE7
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 "A/C COMPRESSOR CONTROL" parameter on the scantool.
specification : A/C switch "ON" : A/C RELAY "ON" (Aircon compressor turns ON and OFF
periodically by Aircon pressure S/W. )
A/C switch "OFF" : A/C RELAY "OFF"
DIESEL CONTROL SYSTEM
FLA -341
Fig.1
Fig.2
Fig.1) The operating condition of aircon relay is shown. Check if aircon compressor works properly when aircon switch is turning
ON.
Fig.2) Diagnosing problem of "A/C RELAY" and "AIRCON COMPRESSOR" is convenient through ACTUATION TEST on the
Scantool.
EGNG001C
TERMINAL AND CONNECTOR INSPECTION
E1F82ED2
1.
Electrical systems consist of a lot of harness and connectors, poor connection of terminals can cause various prob-
lems and damage 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 mail connector and insert it to the terminal at female connector for
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
E3E7297E
1.
Check power circuit voltage
1)
IG KEY "OFF", ENGINE "OFF".
2)
Disconnect A/C relay.
3)
Measure the voltage of A/C relay terminal 1.
FLA -342
FUEL SYSTEM
specification : 11.5V~13.0V
4)
Is the measured voltage within the specification?
YES
▶ Go to "2. Check IG KEY "ON" power circuit".
NO
▶ Repair problems of 10A FUSE in engineroom junction box and related circuit and go to "Verification of Vehicle
Repair".
2.
Check IG KEY "ON" power circuit
1)
IG KEY "OFF", ENGINE "OFF".
2)
Disconnect A/C relay (E66).
3)
IG KEY "ON".
4)
Measure the voltage of glow relay terminal 3.
specification : 11.5V~13.0V
5)
Is the measured voltage within the specification?
YES
▶ Go to "Control Circuit Inspection".
NO
▶ Repair problems of E/R FUSE & RELAY BOX 10A FUSE in engineroom junction box and related circuit and
go to "Verification of Vehicle Repair".
CONTROL CIRCUIT INSPECTION
E311F1D2
1.
Check monitoring voltage in control circuit
1)
IG KEY "OFF", ENGINE "OFF".
2)
Disconnect A/C relay (E66).
3)
IG KEY "ON".
4)
Measure the voltage of glow relay terminal 5.
specification : 3.2V~3.7V
5)
Is the measured voltage within the specification?
YES
▶ Go to "Component Inspection".
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