Nissan Primera P12. Instruction — part 273
DTC P1272 FUEL PUMP
EC-277
[YD (WITH EURO-OBD)]
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EC
DTC P1272 FUEL PUMP
PFP:16700
Description
EBS013R8
When the fuel pressure in fuel rail increases to excessively high, fuel
pressure relief valve opens to carry excess fuel to the return hose.
CONSULT-II Reference Value in Data Monitor Mode
EBS013R9
Specification data are reference values.
ECM Terminals and Reference Value
EBS013RA
Specification data are reference values and are measured between each terminal and ground.
Pulse signal is measured by CONSULT-II.
CAUTION:
Do not use ECM ground terminals when measuring input/output voltage. Doing so may result in dam-
age to the ECM's transistor. Use a ground other than ECM terminals, such as the ground.
MBIB0924E
MONITOR ITEM
CONDITION
SPECIFICATION
PUMP CURRENT
●
Engine: After warming up
●
Air conditioner switch: OFF
●
Shift lever: Neutral position
●
No-load
Idle
1,700 - 1,900 mA
2,000 rpm
1,600 - 1,800 mA
TERMI-
NAL
NO.
WIRE
COLOR
ITEM
CONDITION
DATA
(DC Voltage and Pulse Signal)
10
Y/L
Fuel pump power supply
[Engine is running]
●
Warm-up condition
●
Idle speed
0 - 12.5V
[Engine is running]
●
Warm-up condition
●
Engine speed is 2,000 rpm
0 - 12.5V
MBIB0885E
MBIB0886E
EC-278
[YD (WITH EURO-OBD)]
DTC P1272 FUEL PUMP
: Average voltage for pulse signal (Actual pulse signal can be confirmed by oscilloscope.)
On Board Diagnosis Logic
EBS013RB
DTC Confirmation Procedure
EBS013RC
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.
Turn ignition switch ON.
2.
Select “DATA MONITOR” mode with CONSULT-II.
3.
Start engine and keep engine speed more than 4,000 rpm for at
least 5 seconds, then release the accelerator pedal.
4.
If 1st trip DTC is detected, go to
EC-280, "Diagnostic Procedure"
.
WITH GST
Follow the procedure “WITH CONSULT-II” above.
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
P1272
Fuel rail pressure relief
valve open
Fuel rail pressure relief valve is open
because of fuel pressure control system
malfunction.
●
Harness or connectors
(Fuel pump circuit is open or shorted.)
●
Fuel pump
●
Fuel rail pressure sensor
●
Air mixed with fuel
●
Lack of fuel
SEF817Y
DTC P1272 FUEL PUMP
EC-279
[YD (WITH EURO-OBD)]
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EC
Wiring Diagram
EBS013RD
MBWA0396E
EC-280
[YD (WITH EURO-OBD)]
DTC P1272 FUEL PUMP
Diagnostic Procedure
EBS013RE
1.
PERFORM FUEL PUMP LEARNING VALUE CLEARING
NOTE:
If the DTC is detected because of air mixed with fuel (i.e.: caused by lack of fuel), it may become normal by
performing following procedure.
With CONSULT-II
1.
Turn ignition switch ON.
2.
Perform Fuel Pump Learning value clearing. Refer to
EC-29, "Fuel Pump Learning Value Clearing"
.
3.
Start engine and let it idle for at least 60 seconds.
4.
Select “SELF-DIAG RESULT” mode with CONSULT-II.
5.
Touch “ERASE”.
6.
Perform
EC-278, "DTC Confirmation Procedure"
, again.
7.
Is 1st trip DTC detected again?
With GST
1.
Turn ignition switch ON.
2.
Perform Fuel Pump Learning value clearing. Refer to
EC-29, "Fuel Pump Learning Value Clearing"
.
3.
Start engine and let it idle for at least 60 seconds.
4.
Select MODE 4 with GST.
5.
Touch “ERASE”.
6.
Perform
EC-278, "DTC Confirmation Procedure"
, again.
7.
Is 1st trip DTC detected again?
Yes or No
Yes
>> GO TO 2.
No
>> INSPECTION END
2.
CHECK FUEL PUMP POWER SUPPLY 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 3.
NG
>> Repair open circuit or short to ground or short to power in harness or connectors.
PBIB1943E
Continuity should exist.
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