Hyundai: Engine D4FA. Manual — part 152
DIESEL CONTROL SYSTEM
FLA -479
DTC DETECTING CONDITION
E961B743
Item
Detecting Condition
Possible Cause
DTC Strategy
• Voltage monitoring
Enable Conditions
• Engine running
ThresholdValue
• Short to GND in Lambda sensor circuit
• Open in Lambda sensor circuit
DiagnosticTime
• 2.0 sec.
Fuel Cut
NO
EGR Off
NO
Fuel Limit
NO
Fail Safe
MIL
NO
• Lambda sensor circuit
• Lambda sensor component
SPECIFICATION
EAC9D850
rich gas mixture of synthetic gas
9%CO, 7%H
2
, 7%CO
2
in Nz
lean gas : O2 in N2
= (X
02
/3 1) / (1-4.76
*
X
O2
)
for H/C = 2
1.500
1.000
0.500
0.000
-0.500
-1.000
-1.500
-2.000
Ip meas/mA
EGNG009D
λ value
0.65
0.70
0.80
0.90
1.01
1.18
1.43
1.70
2.42
Air
Pump-
ing cur-
rent
-2.22
-1.82
-1.11
-0.50
0.00
0.33
0.67
0.94
1.38
2.54
FLA -480
FUEL SYSTEM
SCHEMATIC DIAGRAM
E109AFD4
C141 Lambda sensor
1
1
2
3
4
6
5
2
C101-2 terminal 64
Sensor power
Main relay power
10A SNSR FUSE
3
Sensor ground
C101-2 terminal 86
4
Sensor signal
C101-2 terminal 87
5
Sensor heater
C101-2 terminal 51
6
Sensor pump
C101-2 terminal 65
64. Sensor power
86. Sensor ground
87. Sensor signal
65. Sensor pump
51. Sensor heater
10A SNSR FUSE (Main relay power)
C01-2 ECM
C141 Lambda sensor
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
1
2
3
4
5
6
[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
EGNG009E
DIESEL CONTROL SYSTEM
FLA -481
SIGNAL WAVEFORM AND DATA
E424DC09
Fig.1
Fig.2
Fig.3
Fig.4
Fig.1) Waveform of Lambda sensor power(terminal 1) at IG KEY "ON" and Engine running. It fluctuates between 1V and 3V
periodically.
Fig.2) Waveform of Lambda sensor ground(terminal 3) at IG KEY "ON" and Engine running. 2.5V is displayed.
Fig.3) Waveform of Lambda sensor signal(terminal 4) at IG KEY "ON" and Engine running. 850mV is displayed.
(same value at idle and acceleration)
Fig.4) Waveform of Lambda sensor pump(terminal 6) at IG KEY "ON" and Engine running. 850mV is displayed.
(same value at idle and acceleration)
EGNG009F
TERMINAL AND CONNECTOR INSPECTION
E35B5F56
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 for
checking connecting condition. ( after checking, reconnect the pin at correct position. )
FLA -482
FUEL SYSTEM
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
EC40DF80
1.
Check voltage & waveform in sensor power circuit
1)
IG KEY "OFF", ENGINE "OFF".
2)
Disconnect Lambda sensor connector.
3)
IG KEY "ON".
4)
Measure the voltage of Lambda sensor connector terminal 1.
5)
Monitor the waveform in Lambda sensor connector terminal 1.
Specification : Measured voltage : 2.0 V
waveform : Refer to "Signal Waveform & Data" of "General Information". The waveform similar to Fig.1) is displayed.
6)
Is the measured voltage within the specification?
YES
▶ Go to "Signal Circuit Inspection".
NO
▶ No voltage detected in Lambda sensor power circuit : Go to "2. Check open in sensor power circuit" as follows.
▶ High voltage detected in Lambda sensor power circuit : Repair short to battery in Lambda sensor power circuit
and go to "Verification of Vehicle Repair".
2.
Check open in Lambda sensor power circuit
1)
IG KEY "OFF", ENGINE "OFF".
2)
Disconnect Lambda sensor connector and ECM connector.
3)
Check continuity between Lambda sensor connector terminal 1 and ECM connector terminal 64.
Specification : Continuity(below 1.0Ω )
4)
Is the measured voltage within the specification?
YES
▶ Repair short to ground in Lambda sensor power circuit and go to "Verification of Vehicle Repair".
NO
▶ Reapir open in Lambda sensor power circuit and go to "Verification of Vehicle Repair".
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