Hyundai: Engine D4FA. Manual — part 155
DIESEL CONTROL SYSTEM
FLA -491
YES
▶ Repair short to ground in Lambda sensor ground circuit and go to "Verification of Vehicle Repair".
NO
▶ Repair open in Lambda sensor ground circuit and go to "Verification of Vehicle Repair".
COMPONENT INSPECTION
E2874034
1.
Lambda sensor Visual Inspection
1)
IG KEY "OFF", ENGINE "OFF".
2)
Disconnect Lambda sensor connector.
3)
Perform visual inspection for each checking point as follows.
a.
Check corrosion inside of Lambda sensor terminal.
b.
Check damaged coverring and open in component wiring.
c.
Check connecting torque(poor connection) of Lambda sensor component.
d.
Disconnect Lambda sensor and check deformation, clogging, melting of Lambda detecting prove.
Specification : Everyting OK
4)
Is any problem of Lambda sensor detected?
YES
▶ Replace Lambda sensor and go to "Verification of Vehicle Repair".
NO
▶ Refer to "NOTE" as follows.
NOTE
In diesel engine, ultra lean combustion generates at normal operating condition. Therefore, Lambda2 sensor sig-
nal change in accordance with engine acceleration and various loading condition rarely happens, unlikely to linear
Lambda sensor of gasoline engine. Moreover, pumping current is not measurable with normal measuring device(am-
pere meter) because maximum value is 3mA. If DTC code is recorded continuously eventhough circuit inspection is
correctly performed and no problem at visual inspection of component is detected, replace Lambda sensor.
VERIFICATION OF VEHICLE REPAIR
E0D0A246
Refer to DTC P2238.
FLA -492
FUEL SYSTEM
DTC P2251 LAMBDA SENSOR REFERENCE GROUND CIRCUIT/OPEN
(BANK 1 / SENSOR 1)
COMPONENT LOCATION
EE98E563
Refer to DTC P2238.
GENERAL DESCRIPTION
E7A8EFD8
Refer to DTC P2238.
DTC DESCRIPTION
EF160269
P2251 is set when ground line(terminal 3) is opened. This code is due to the problem of Lambda sensor circuit.
DTC DETECTING CONDITION
E881FD8F
Item
Detecting Condition
Possible Cause
DTC Strategy
• Voltage monitoring
Enable Conditions
• Engine running
ThresholdValue
• Open in Lambda sensor ground 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
E358671F
Refer to DTC P2238.
SCHEMATIC DIAGRAM
EC04CF75
Refer to DTC P2238.
SIGNAL WAVEFORM AND DATA
E55D9F39
Refer to DTC P2238.
TERMINAL AND CONNECTOR INSPECTION
E3C4F5A7
Refer to DTC P2238.
POWER CIRCUIT INSPECTION
E70B5E0A
1.
Check voltage & waveform in sensor power circuit
1)
IG KEY "OFF", ENGINE "OFF".
DIESEL CONTROL SYSTEM
FLA -493
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 OLambda 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".
SIGNAL CIRCUIT INSPECTION
E23B326A
1.
Check voltage in sensor signal 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 4.
Specification : 0.8V~0.9 V
5)
Is the measured voltage within the specification?
FLA -494
FUEL SYSTEM
YES
▶ Go to "3. Check sensor pump circuit".
NO
▶ No voltage detected in Lambda sensor signal circuit : Go to "2. Check open in sensor signal circuit" as follows.
▶ High voltage detected in Lambda sensor power circuit : Repair short to battery in Lambda sensor signal circuit
and go to "Verification of Vehicle Repair".
2.
Check open in Lambda sensor signal circuit
1)
IG KEY "OFF", ENGINE "OFF".
2)
Disconnect Lambda sensor connector and ECM connector.
3)
Check continuity between Lambda sensor connector terminal 4 and ECM connector terminal 87.
Specification : Continuity (below 1.0Ω )
4)
Is the measured resistance within the specification?
YES
▶ Repair short to ground in Lambda sensor signal circuit and go to "Verification of Vehicle Repair".
NO
▶ Repair open in Lambda sensor signal circuit and go to "Verification of Vehicle Repair".
3.
Check voltage in sensor pump 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 6.
Specification : 0.8V~0.9 V
5)
Is the measured voltage within the specification?
YES
▶ Go to "Ground Circuit Inspection".
NO
▶ No voltage detected in Lambda sensor pumpl circuit : Go to "4. Check open in sensor pump circuit" as follows.
▶ High voltage detected in Lambda sensor power circuit : Repair short to battery in Lambda sensor pump circuit
and go to "Verification of Vehicle Repair".
4.
Check open in sensor pump circuit
1)
IG KEY "OFF", ENGINE "OFF".
2)
Disconnect Lambda sensor connector and ECM connector.
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