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![NISSAN X-TRAIL 2005 Service Repair Manual DTC P1268 - P1271 FUEL INJECTOR
EC-1261
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Diagnostic ProcedureEBS011DM
1. CHECK FUEL INJECOR POWER SUPPLY CIRCUIT FOR OPEN AND SHORT
1. Turn ignition swi NISSAN X-TRAIL 2005 Service Repair Manual DTC P1268 - P1271 FUEL INJECTOR
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Diagnostic ProcedureEBS011DM
1. CHECK FUEL INJECOR POWER SUPPLY CIRCUIT FOR OPEN AND SHORT
1. Turn ignition swi](/manual-img/5/57403/w960_57403-1664.png)
DTC P1268 - P1271 FUEL INJECTOR
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Diagnostic ProcedureEBS011DM
1. CHECK FUEL INJECOR POWER SUPPLY CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch OFF.
2. Disconnect ECM harness connector.
3. Disconnect fuel injector harness connector.
4. Check harness continuity between the following terminals corre-
sponding to the malfunctioning cylinder. Refer to Wiring Dia-
gram.
5. 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 ECM OUTPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Check harness continuity between the following terminals corresponding to the malfunctioning cylinder.
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 INJECTOR-I
Refer to EC-1262, "
Component Inspection" .
OK or NG
OK >> GO TO 4.
NG >> Replace fuel injector.
DTCTe r m i n a l
Cylinder
ECM Fuel injector
P1268 4 3 No.1
P1269 5 3 No.2
P1270 5 3 No.3
P1271 4 3 No.4
Continuity should exist.
PBIB1896E
DTCTe r m i n a l
Cylinder
ECM Fuel injector
P1268 42, 43 4 No.1
P1269 21, 22 4 No.2
P1270 23, 24 4 No.3
P1271 40, 41 4 No.4
Continuity should exist.
Page 1666 of 4555
![NISSAN X-TRAIL 2005 Service Repair Manual EC-1262
[YD (WITH EURO-OBD)]
DTC P1268 - P1271 FUEL INJECTOR
4. CHECK FUEL INJECTOR-II
With CONSULT-II
1. Remove two fuel injectors of malfunctioning cylinder and another cylinder.
2. Install fuel NISSAN X-TRAIL 2005 Service Repair Manual EC-1262
[YD (WITH EURO-OBD)]
DTC P1268 - P1271 FUEL INJECTOR
4. CHECK FUEL INJECTOR-II
With CONSULT-II
1. Remove two fuel injectors of malfunctioning cylinder and another cylinder.
2. Install fuel](/manual-img/5/57403/w960_57403-1665.png)
EC-1262
[YD (WITH EURO-OBD)]
DTC P1268 - P1271 FUEL INJECTOR
4. CHECK FUEL INJECTOR-II
With CONSULT-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-1258, "
DTC Confirmation Procedure" .
8. Is another DTC displayed?
With GST
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 Service $04 with GST.
6. Touch “ERASE”.
7. Perform EC-1258, "
DTC Confirmation Procedure" .
8. Is another DTC displayed?
Ye s o r N o
Yes >> Replace fuel injector of malfunctioning cylinder.
No >> GO TO 5.
5. CHECK INTERMITTENT INCIDENT
Refer to EC-1045, "
TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT" .
>>INSPECTION END
Component InspectionEBS011DN
FUEL INJECTOR
1. Disconnect fuel injector.
2. Check continuity between terminals as shown in the figure.
3. If NG, replace fuel injector.
Removal and InstallationEBS011DO
FUEL INJECTOR
Refer to EM-167, "INJECTION TUBE AND FUEL INJECTOR" .
Continuity should exist.
PBIB0406E
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![NISSAN X-TRAIL 2005 Service Repair Manual DTC P1272 FUEL PUMP
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DTC P1272 FUEL PUMPPFP:16700
DescriptionEBS011DP
When the fuel pressure in fuel rail increases to excessively high, fuel
pr NISSAN X-TRAIL 2005 Service Repair Manual DTC P1272 FUEL PUMP
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DTC P1272 FUEL PUMPPFP:16700
DescriptionEBS011DP
When the fuel pressure in fuel rail increases to excessively high, fuel
pr](/manual-img/5/57403/w960_57403-1666.png)
DTC P1272 FUEL PUMP
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DTC P1272 FUEL PUMPPFP:16700
DescriptionEBS011DP
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 ModeEBS012AQ
Specification data are reference values.
On Board Diagnosis LogicEBS011DQ
NOTE:
If DTC P1272 is displayed with DTC P0652 or P0653, first perform trouble diagnosis for DTC P0652
or P0653. Refer to EC-1240, "
DTC P0652, P0653 SENSOR POWER SUPPLY" .
DTC Confirmation ProcedureEBS011DR
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-1266, "
Diagnostic Proce-
dure" .
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
DTC No. Trouble diagnosis name DTC detecting condition Possible cause
P1272
1272Fuel rail pressure relief
valve openFuel 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
Fuel transport pump operation
SEF817Y
Page 1668 of 4555
EC-1264
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DTC P1272 FUEL PUMP
WITH GST
Follow the procedure “WITH CONSULT-II” above.
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DTC P1272 FUEL PUMP
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Wiring DiagramEBS012AJ
TBWA0574E
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![NISSAN X-TRAIL 2005 Service Repair Manual EC-1266
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DTC P1272 FUEL PUMP
Specification data are reference values and are measured between each terminal and ground.
Pulse signal is measured by CONSULT-II.
CAUTION:
Do not us NISSAN X-TRAIL 2005 Service Repair Manual EC-1266
[YD (WITH EURO-OBD)]
DTC P1272 FUEL PUMP
Specification data are reference values and are measured between each terminal and ground.
Pulse signal is measured by CONSULT-II.
CAUTION:
Do not us](/manual-img/5/57403/w960_57403-1669.png)
EC-1266
[YD (WITH EURO-OBD)]
DTC P1272 FUEL PUMP
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.
: Average voltage for pulse signal (Actual pulse signal can be confirmed by oscilloscope.)
Diagnostic ProcedureEBS011DS
1. CHECK FUEL TRANSPORT PUMP OPERATION
Perform Diagnostic Procedure for fuel transport pump. Refer to EC-1334
.
OK or NG
OK >> GO TO 2.
NG >> Follow the instruction of Diagnostic Procedure for fuel transport pump.
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
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![NISSAN X-TRAIL 2005 Service Repair Manual DTC P1272 FUEL PUMP
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2. PERFORM FUEL PUMP LEARNING VALUE CLEARING
NOTE:
If the DTC is detected because of air mixed with fuel (i.e.: caused by l NISSAN X-TRAIL 2005 Service Repair Manual DTC P1272 FUEL PUMP
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2. PERFORM FUEL PUMP LEARNING VALUE CLEARING
NOTE:
If the DTC is detected because of air mixed with fuel (i.e.: caused by l](/manual-img/5/57403/w960_57403-1670.png)
DTC P1272 FUEL PUMP
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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-994, "
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-1263, "
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-994, "
Fuel Pump Learning Value Clearing" .
3. Start engine and let it idle for at least 60 seconds.
4. Select Service $04 with GST.
5. Touch “ERASE”.
6. Perform EC-1263, "
DTC Confirmation Procedure" , again.
7. Is 1st trip 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 1672 of 4555
![NISSAN X-TRAIL 2005 Service Repair Manual EC-1268
[YD (WITH 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 D NISSAN X-TRAIL 2005 Service Repair Manual EC-1268
[YD (WITH 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 D](/manual-img/5/57403/w960_57403-1671.png)
EC-1268
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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-1268, "
Component Inspection" .
OK or NG
OK >> GO TO 6.
NG >> GO TO 8.
6. CHECK FUEL RAIL PRESSURE SENSOR
Refer to E C - 111 5 , "
Component Inspection" .
OK or NG
OK >> GO TO 7.
NG >> Replace fuel rail.
7. CHECK INTERMITTENT INCIDENT
Refer to EC-1045, "
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-994, "
Fuel Pump Learning Value Clearing" .
>>INSPECTION END
Component InspectionEBS012AK
FUEL PUMP
1. Check continuity between fuel supply pump terminals 1 and 2.
2. If NG, replace fuel pump.Continuity should exist.
Continuity should exist.
SEF807Z