Nissan Primera P12. Manual — part 350
DTC P1274 FUEL PUMP
EC-585
[YD (WITHOUT EURO-OBD)]
C
D
E
F
G
H
I
J
K
L
M
A
EC
: Average voltage for pulse signal (Actual pulse signal can be confirmed by oscilloscope.)
On Board Diagnosis Logic
EBS015B6
DTC Confirmation Procedure
EBS015B7
NOTE:
If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at
least 10 seconds before conducting the next test.
WITH CONSULT-II
1.
Tuning ignition switch ON.
2.
Select “DATA MONITOR” mode with CONSULT-II.
3.
Start engine and let idle for at least 5 seconds.
4.
If DTC is detected, go to
EC-587, "Diagnostic Procedure"
.
29
L
Fuel pump
[Engine is running]
●
Warm-up condition
●
Idle speed
0.5 - 1.0V
[Engine is running]
●
Warm-up condition
●
Engine speed is 2,000 rpm
0.5 - 1.0V
TERMI-
NAL
NO.
WIRE
COLOR
ITEM
CONDITION
DATA
(DC Voltage and Pulse Signal)
MBIB0887E
MBIB0888E
DTC No.
Trouble diagnosis name
DTC detecting condition
Possible cause
P1274
Fuel pump protection
Fuel pressure is too much higher than the target
value.
●
Harness or connectors
(The fuel pump circuit is open or
shorted.)
●
Fuel pump
●
Fuel rail pressure sensor
SEF817Y
EC-586
[YD (WITHOUT EURO-OBD)]
DTC P1274 FUEL PUMP
Wiring Diagram
EBS015B8
MBWA0396E
DTC P1274 FUEL PUMP
EC-587
[YD (WITHOUT EURO-OBD)]
C
D
E
F
G
H
I
J
K
L
M
A
EC
Diagnostic Procedure
EBS015B9
1.
CHECK ECM OUTPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1.
Turn ignition switch OFF.
2.
Disconnect ECM harness connector and fuel pump harness
connectors.
3.
Check harness continuity between ECM terminal 10 and fuel pump terminal 1.
Refer to Wiring Diagram.
4.
Also check harness for short to ground and short to power.
OK or NG
OK
>> GO TO 2.
NG
>> Repair open circuit or short to ground or short to power in harness or connectors.
2.
CHECK FUEL PUMP GROUND CIRCUIT FOR OPEN AND SHORT
1.
Check harness continuity between ECM terminal 29 and fuel pump terminal 2.
Refer to Wiring Diagram.
2.
Also check harness for short to ground and short to power.
OK or NG
OK
>> GO TO 3.
NG
>> Repair open circuit or short to ground or short to power in harness or connectors.
3.
CHECK FUEL RAIL PRESSURE SENSOR
Refer to
EC-456, "Component Inspection"
.
OK or NG
OK
>> GO TO 4.
NG
>> Replace fuel rail.
4.
CHECK FUEL PUMP
Refer to
EC-588, "Component Inspection"
.
OK or NG
OK
>> GO TO 6.
NG
>> GO TO 5.
5.
REPLACE FUEL PUMP
1.
Replace fuel pump.
2.
Perform Fuel Pump Learning Valve Clearing. Refer to
EC-368, "Fuel Pump Learning Value Clearing"
.
>> INSPECTION END
PBIB1943E
Continuity should exist.
Continuity should exist.
EC-588
[YD (WITHOUT EURO-OBD)]
DTC P1274 FUEL PUMP
6.
CHECK INTERMITTENT INCIDENT
Refer to
EC-408, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT"
.
>> INSPECTION END
Component Inspection
EBS015BA
FUEL PUMP
1.
Check continuity between fuel pump terminals 1 and 2.
2.
If NG, replace fuel pump.
Removal and Installation
EBS015BB
FUEL PUMP
Refer to
.
Continuity should exist.
MBIB0623E
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