NISSAN NAVARA 2005 Repair Workshop Manual

DTC P1268 - P1271 FUEL INJECTOR
EC-241
C
D
E
F
G
H
I
J
K
L
MA
EC
Diagnostic ProcedureEBS01KJE
1.CHECK INJECTOR ADJUSTMENT VALUE
1. Turn ignition switch ON.
2. Select “ENTER INJECTOR CALIB DATA” in “WORK SUP-
PORT” mode with CONSULT-II.
3. Check injector adjustment values displayed on CONSULT-II
screen.
OK or NG
OK >> GO TO 2.
NG >> Perform Injector Adjustment Value Registration. Refer to
EC-25, "
Injector Adjustment Value Registration".
2.CHECK FUEL INJECOR POWER SUPPLY CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch OFF.
2. Disconnect ECM harness connector.
3. Disconnect fuel injector (1) 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 3.
NG >> Repair open circuit or short to ground or short to power in harness or connectors.The value displayed on CONSULT-II screen should
be same as injector adjustment value printed on
each fuel injector.
MBIB1255E
DTCTe r m i n a l
Cylinder
ECM Fuel injector
P1268 4 1 No.1
P1269 5 1 No.2
P1270 5 1 No.3
P1271 4 1 No.4
Continuity should exist.
MBIB1203E

EC-242
DTC P1268 - P1271 FUEL INJECTOR
3.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 4.
NG >> Repair open circuit or short to ground or short to power in harness or connectors.
4.CHECK FUEL INJECTOR-I
Refer toEC-243, "
Component Inspection".
OK or NG
OK >> GO TO 5.
NG >> Replace fuel injector.
DTCTerminal
Cylinder
ECM Fuel injector
P1268 42, 43 2 No.1
P1269 21, 22 2 No.2
P1270 23, 24 2 No.3
P1271 40, 41 2 No.4
Continuity should exist.

DTC P1268 - P1271 FUEL INJECTOR
EC-243
C
D
E
F
G
H
I
J
K
L
MA
EC
5.CHECK FUEL INJECTOR-II
With CONSULT-II
1. Remove two fuel injectors.
NOTE:
One is from malfunctioning cylinder and the other is from any cylinder other than the malfunctioning cylin-
der.
2. Swap the two fuel injectors to the other cylinder.
3. Reconnect ECM harness connector and fuel injector harness connector.
4. Turn ignition switch ON.
5. Perform Injector Adjustment Value Registration. Refer toEC-25, "
Injector Adjustment Value Registration".
6. Select “SELF DIAG RESULTS” mode with CONSULT-II.
7. Touch “ERASE”.
8. PerformEC-239, "
DTC Confirmation Procedure".
9. Is DTC displayed for the other cylinder?
Without CONSULT-II
1. Remove two fuel injectors.
NOTE:
One is from malfunctioning cylinder and the other is from any cylinder other than the malfunctioning cylin-
der.
2. Swap the two fuel injectors to the other cylinder.
3. Reconnect ECM harness connector and fuel injector harness connector.
4. Turn ignition switch ON.
5. Perform Injector Adjustment Value Registration. Refer toEC-25, "
Injector Adjustment Value Registration".
6. Erase the Diagnostic Test Mode II (Self-diagnostic results) memory. Refer toEC-27
.
7. PerformEC-239, "
DTC Confirmation Procedure".
8. Is DTC displayed for the other cylinder?
Ye s o r N o
Ye s > > G O T O 6 .
No >> GO TO 7.
6.REPLACE FUEL INJECOR
1. Replace fuel injector of malfunctioning cylinder.
2. Perform Injector Adjustment Value Registration. Refer toEC-25, "
Injector Adjustment Value Registration".
>>INSPECTION END
7.CHECK INTERMITTENT INCIDENT
Refer toEC-70, "
TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT".
>>INSPECTION END
Component InspectionEBS01KJF
FUEL INJECTOR
1. Disconnect fuel injector harness connector.

EC-244
DTC P1268 - P1271 FUEL INJECTOR
2. Check resistance between terminals as shown in the figure.
3. If NG, replace fuel injector.
Removal and InstallationEBS01KJG
FUEL INJECTOR
Refer toEM-44, "INJECTION TUBE AND FUEL INJECTOR". Resistance: 0.2 - 0.8W[at 10 - 60°C (50 - 140°F)]
MBIB1253E

DTC P1272 FUEL PUMP
EC-245
C
D
E
F
G
H
I
J
K
L
MA
EC
DTC P1272 FUEL PUMPPFP:16700
DescriptionEBS01KJH
When the fuel pressure in fuel rail increases to excessively high, fuel
pressure relief valve (1) opens to carry excess fuel to the return
hose.
l: Vehicle front
lFuel rail (2)
CONSULT-II Reference Value in Data Monitor ModeEBS01KJI
Specification data are reference values.
ECM Terminals and Reference ValueEBS01KJJ
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.
MBIB1199E
MONITOR ITEM CONDITION SPECIFICATION
PUMP CURRENT
lEngine: After warming up
lAir conditioner switch: OFF
lShift lever: P or N (A/T), Neutral (M/T)
lNo loadIdle 1,600 - 2,000 mA
2,000 rpm 1,500 - 1,900 mA
TERMI-
NAL
NO.WIRE
COLORITEM CONDITIONDATA
(DC Voltage and Pulse Signal)
10 G Fuel pump[Engine is running]
lWarm-up condition
lIdle speedApproximately 5.8V
[Engine is running]
lWarm-up condition
lEngine speed: 2,000 rpmApproximately 5.5V
MBIB0885E
MBIB0886E

EC-246
DTC P1272 FUEL PUMP
: Average voltage for pulse signal (Actual pulse signal can be confirmed by oscilloscope.)
On Board Diagnosis LogicEBS01KJK
The MI will not light up for this self-diagnosis.
NOTE:
If DTC P1272 is displayed with DTC P0652 or P0653, first perform the trouble diagnosis for DTC P0652
or P0653. Refer toEC-227, "
DTC P0652, P0653 SENSOR POWER SUPPLY".
DTC Confirmation ProcedureEBS01KJL
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 DTC is detected, go toEC-249, "
Diagnostic Procedure".
WITHOUT CONSULT-II
1. Start engine and keep engine speed more than 4,000 rpm for at least 5 seconds, then release the acceler-
ator pedal.
29 B Fuel pump[Engine is running]
lWarm-up condition
lIdle speed0.5 - 1.0V
[Engine is running]
lWarm-up condition
lEngine speed: 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
P1272
1272Fuel rail pressure relief
valve openFuel rail pressure relief valve is open
because of fuel pressure control system
malfunction.
lHarness or connectors
(Fuel pump circuit is open or shorted.)
lFuel pump
lFuel rail pressure sensor
lAir mixed with fuel
lLack of fuel
SEF817Y

DTC P1272 FUEL PUMP
EC-247
C
D
E
F
G
H
I
J
K
L
MA
EC
2. Turn ignition switch OFF, wait at least 10 seconds and then turn ON.
3. Perform Diagnostic Test Mode II (Self-diagnostic results) with ECM.
4. If DTC is detected, go toEC-249, "
Diagnostic Procedure".

EC-248
DTC P1272 FUEL PUMP
Wiring Diagram
EBS01KJM
MBWA1050E

DTC P1272 FUEL PUMP
EC-249
C
D
E
F
G
H
I
J
K
L
MA
EC
Diagnostic ProcedureEBS01KJN
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 toEC-24, "
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. PerformEC-246, "
DTC Confirmation Procedure", again.
7. Is DTC detected again?
Without CONSULT-II
1. Turn ignition switch ON.
2. Perform Fuel Pump Learning Value Clearing. Refer toEC-24, "
Fuel Pump Learning Value Clearing".
3. Start engine and let it idle for at least 60 seconds.
4. Erase the Diagnostic Test Mode II (Self-diagnostic results) memory. Refer toEC-27
.
5. PerformEC-246, "
DTC Confirmation Procedure", again.
6. Is DTC displayed again?
Ye s o r N o
Ye s > > G O T O 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 (2) harness
connector.
–Fuel pump temperature sensor (1)
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.
3.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 4.
NG >> Repair open circuit or short to ground or short to power in harness or connectors.
Continuity should exist.
MBIB1389E
Continuity should exist.

EC-250
DTC P1272 FUEL PUMP
4.CHECK FUEL PUMP
Refer toEC-250, "
Component Inspection".
OK or NG
OK >> GO TO 5.
NG >> GO TO 7.
5.CHECK FUEL RAIL PRESSURE SENSOR
Refer toEC-122, "
Component Inspection".
OK or NG
OK >> GO TO 6.
NG >> Replace fuel rail.
6.CHECK INTERMITTENT INCIDENT
Refer toEC-70, "
TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT".
OK or NG
OK >> GO TO 7.
NG >> Repair or replace.
7.REPLACE FUEL PUMP
1. Replace fuel pump.
2. Perform Fuel Pump Learning Value Clearing. Refer toEC-24, "
Fuel Pump Learning Value Clearing".
>>INSPECTION END
Component InspectionEBS01KJO
FUEL PUMP
1. Disconnect fuel pump harness connector.
2. Check resistance between fuel pump terminals 1 and 2.
3. If NG, replace fuel pump.
Removal and InstallationEBS01KJP
FUEL RAIL
Refer toEM-44, "INJECTION TUBE AND FUEL INJECTOR".
FUEL PUMP
Refer toEM-49, "FUEL PUMP". Resistance: 1.5 - 3.0W[at 10 - 60°C (50 - 140°F)]
PBIB0417E