Page 1793 of 4179
DTC P1268 - P1271 FUEL INJECTOR
EC-1415
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4. CHECK FUEL INJECTOR-II
1. Remove two fuel injectors of malfunctioning cylinder and another cylinder.
2. Install fuel injectors to different cylinder.
3. Reconnect ECM harness connector and fuel injector harness connector.
4. Turn ignition switch ON.
5. Select “SELF DIAG RESULTS” mode with CONSULT-II.
6. Touch “ERASE”.
7. Perform EC-1412, "
DTC Confirmation Procedure" .
8. Is another DTC displayed?
Ye s o r N o
>> If DTC is not detected, go to next step.
5. CHECK INTERMITTENT INCIDENT
Refer to EC-1260, "
TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT" .
>>INSPECTION END
Component InspectionEBS01274
FUEL INJECTOR
1. Disconnect fuel injector.
2. Check continuity between terminals as shown in the figure.
3. If NG, replace fuel injector.
Removal and InstallationEBS01275
FUEL INJECTOR
Refer to EM-157, "INJECTION TUBE AND FUEL INJECTOR" . Continuity should exist.
PBIB0406E
Page 1794 of 4179
![NISSAN X-TRAIL 2003 Service Repair Manual EC-1416
[YD (WITHOUT EURO-OBD)]
DTC P1272 FUEL PUMP
DTC P1272 FUEL PUMPPFP:16700
DescriptionEBS0123R
When the fuel pressure in fuel rail increases to excessively high, fuel
pressure relief valve ope NISSAN X-TRAIL 2003 Service Repair Manual EC-1416
[YD (WITHOUT EURO-OBD)]
DTC P1272 FUEL PUMP
DTC P1272 FUEL PUMPPFP:16700
DescriptionEBS0123R
When the fuel pressure in fuel rail increases to excessively high, fuel
pressure relief valve ope](/manual-img/5/57404/w960_57404-1793.png)
EC-1416
[YD (WITHOUT EURO-OBD)]
DTC P1272 FUEL PUMP
DTC P1272 FUEL PUMPPFP:16700
DescriptionEBS0123R
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 ModeEBS012AN
Specification data are reference values.
ECM Terminals and Reference ValueEBS012AO
Specification data are reference values and are measured between each terminal and ground.
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.
PBIB1900E
MONITOR ITEM CONDITION SPECIFICATION
PUMP CURRENT
Engine: After warming up
Air conditioner switch: OFF
Shift lever: Neutral position
No-loadIdle 1,700 - 1,900 mA
2,000 rpm 1,600 - 1,800 mA
TERMI-
NAL
NO.WIRE
COLORITEM CONDITIONDATA
(DC Voltage and Pulse Signal)
10 Y/L Fuel pump power supply[Engine is running]
Warm-up condition
Idle speed0 - 12.5V
[Engine is running]
Warm-up condition
Engine speed is 2,000 rpm0 - 12.5V
MBIB0885E
MBIB0886E
Page 1795 of 4179
![NISSAN X-TRAIL 2003 Service Repair Manual DTC P1272 FUEL PUMP
EC-1417
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: Average voltage for pulse signal (Actual pulse signal can be confirmed by oscilloscope.)
On Board Diagnosis LogicEBS01 NISSAN X-TRAIL 2003 Service Repair Manual DTC P1272 FUEL PUMP
EC-1417
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: Average voltage for pulse signal (Actual pulse signal can be confirmed by oscilloscope.)
On Board Diagnosis LogicEBS01](/manual-img/5/57404/w960_57404-1794.png)
DTC P1272 FUEL PUMP
EC-1417
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: Average voltage for pulse signal (Actual pulse signal can be confirmed by oscilloscope.)
On Board Diagnosis LogicEBS0123S
The MI will not light up for this self-diagnosis.
DTC Confirmation ProcedureEBS0123T
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-1419, "
Diagnostic Proce-
dure" .
29 L Fuel pump[Engine is running]
Warm-up condition
Idle speed0.5 - 1.0V
[Engine is running]
Warm-up condition
Engine speed is 2,000 rpm0.5 - 1.0V TERMI-
NAL
NO.WIRE
COLORITEM CONDITIONDATA
(DC Voltage and Pulse Signal)
MBIB0887E
MBIB0888E
DTC No. Trouble diagnosis name DTC detecting condition Possible cause
P1272Fuel rail pressure relief
valve openFuel rail pressure relief valve is open
because of fuel pressure control system mal-
function.
Harness or connectors
(Fuel pump circuit is open or shorted.)
Fuel pump
Fuel rail pressure sensor
Air mixed with fuel
Lack of fuel
Fuel transport pump operation
SEF817Y
Page 1796 of 4179
EC-1418
[YD (WITHOUT EURO-OBD)]
DTC P1272 FUEL PUMP
Wiring DiagramEBS012AW
TBWA0574E
Page 1797 of 4179
![NISSAN X-TRAIL 2003 Service Repair Manual DTC P1272 FUEL PUMP
EC-1419
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Diagnostic ProcedureEBS0123U
1. CHECK FUEL TRANSPORT PUMP OPERATION
Perform Diagnostic Procedure for fuel transport pump NISSAN X-TRAIL 2003 Service Repair Manual DTC P1272 FUEL PUMP
EC-1419
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Diagnostic ProcedureEBS0123U
1. CHECK FUEL TRANSPORT PUMP OPERATION
Perform Diagnostic Procedure for fuel transport pump](/manual-img/5/57404/w960_57404-1796.png)
DTC P1272 FUEL PUMP
EC-1419
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Diagnostic ProcedureEBS0123U
1. CHECK FUEL TRANSPORT PUMP OPERATION
Perform Diagnostic Procedure for fuel transport pump. Refer to EC-1491
.
OK or NG
OK >> GO TO 2.
NG >> Follow the instruction of Diagnostic Procedure for fuel transport pump.
2. 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-1221, "
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-1417, "
DTC Confirmation Procedure" , again.
7. Is DTC detected again?
Ye s o r N o
Ye s > > G O T O 3 .
No >>INSPECTION END
3. 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 2.
Refer to Wiring Diagram.
4. Also check harness for short to ground and short to power.
OK or NG
OK >> GO TO 4.
NG >> Repair open circuit or short to ground or short to power in harness or connectors.
PBIB1943E
Continuity should exist.
Page 1798 of 4179
![NISSAN X-TRAIL 2003 Service Repair Manual EC-1420
[YD (WITHOUT EURO-OBD)]
DTC P1272 FUEL PUMP
4. CHECK FUEL PUMP GROUND CIRCUIT FOR OPEN AND SHORT
1. Check harness continuity between ECM terminal 29 and fuel pump terminal 1.
Refer to Wirin NISSAN X-TRAIL 2003 Service Repair Manual EC-1420
[YD (WITHOUT EURO-OBD)]
DTC P1272 FUEL PUMP
4. CHECK FUEL PUMP GROUND CIRCUIT FOR OPEN AND SHORT
1. Check harness continuity between ECM terminal 29 and fuel pump terminal 1.
Refer to Wirin](/manual-img/5/57404/w960_57404-1797.png)
EC-1420
[YD (WITHOUT EURO-OBD)]
DTC P1272 FUEL PUMP
4. CHECK FUEL PUMP GROUND CIRCUIT FOR OPEN AND SHORT
1. Check harness continuity between ECM terminal 29 and fuel pump terminal 1.
Refer to Wiring Diagram.
2. Also check harness for short to ground and short to power.
OK or NG
OK >> GO TO 5.
NG >> Repair open circuit or short to ground or short to power in harness or connectors.
5. CHECK FUEL PUMP
Refer to EC-1420, "
Component Inspection" .
OK or NG
OK >> GO TO 6.
NG >> GO TO 8.
6. CHECK FUEL RAIL PRESSURE SENSOR
Refer to EC-1312, "
Component Inspection" .
OK or NG
OK >> GO TO 7.
NG >> Replace fuel rail.
7. CHECK INTERMITTENT INCIDENT
Refer to EC-1260, "
TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT" .
OK or NG
OK >> GO TO 8.
NG >> Repair or replace.
8. REPLACE FUEL PUMP
1. Replace fuel pump.
2. Perform Fuel Pump Learning Value Clearing. Refer to EC-1221, "
Fuel Pump Learning Value Clearing" .
>>INSPECTION END
Component InspectionEBS012AP
FUEL PUMP
1. Check continuity between fuel supply pump terminals 1 and 2.
2. If NG, replace fuel pump.
Removal and InstallationEBS0123W
FUEL RAIL
Refer to EM-157, "INJECTION TUBE AND FUEL INJECTOR" . Continuity should exist.
Continuity should exist.
SEF807Z
Page 1799 of 4179
DTC P1272 FUEL PUMP
EC-1421
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FUEL PUMP
Refer to EM-161, "FUEL PUMP" .
Page 1800 of 4179
![NISSAN X-TRAIL 2003 Service Repair Manual EC-1422
[YD (WITHOUT EURO-OBD)]
DTC P1273 FUEL PUMP
DTC P1273 FUEL PUMPPFP:16700
DescriptionEBS0123X
To control the amount of the fuel inhalation of the fuel pump, a plunger is built into the fuel p NISSAN X-TRAIL 2003 Service Repair Manual EC-1422
[YD (WITHOUT EURO-OBD)]
DTC P1273 FUEL PUMP
DTC P1273 FUEL PUMPPFP:16700
DescriptionEBS0123X
To control the amount of the fuel inhalation of the fuel pump, a plunger is built into the fuel p](/manual-img/5/57404/w960_57404-1799.png)
EC-1422
[YD (WITHOUT EURO-OBD)]
DTC P1273 FUEL PUMP
DTC P1273 FUEL PUMPPFP:16700
DescriptionEBS0123X
To control the amount of the fuel inhalation of the fuel pump, a plunger is built into the fuel pump. When the
amount of the fuel inhalation of fuel pump increases, the fuel raises the fuel exhalation pressure. As a result,
the fuel injection pressure is raised. When the load of the engine increases, the ECM sends a signal to the fuel
pump to raise the injection pressure.
CONSULT-II Reference Value in Data Monitor ModeEBS0123Y
Specification data are reference values.
ECM Terminals and Reference ValueEBS0123Z
Specification data are reference values and are measured between each terminal and ground.
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.
MONITOR ITEM CONDITION SPECIFICATION
PUMP CURRENT
Engine: After warming up
Air conditioner switch: OFF
Shift lever: Neutral position
No-loadIdle 1,700 - 1,900 mA
2,000 rpm 1,600 - 1,800 mA
TERMI-
NAL
NO.WIRE
COLORITEM CONDITIONDATA
(DC Voltage and Pulse Signal)
10 Y/L Fuel pump power supply[Engine is running]
Warm-up condition
Idle speed0 - 12.5V
[Engine is running]
Warm-up condition
Engine speed is 2,000 rpm0 - 12.5V
29 L Fuel pump[Engine is running]
Warm-up condition
Idle speed0.5 - 1.0V
[Engine is running]
Warm-up condition
Engine speed is 2,000 rpm0.5 - 1.0V
MBIB0885E
MBIB0886E
MBIB0887E
MBIB0888E