2009 INFINITI QX56 fuel pump

ECM
EC-471
< ECU DIAGNOSIS > [VK56DE]
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SEC-
OND-
ARY AIR
71H Secondary Air system P0411 80H 01H
Secondary Air Injection System Incor-
rect Flow Detected
Bank1: P0491
Bank2: P0492 81H 01H
Secondary Air Injection System Insuffi-
cient Flow
P2445 82H 01H Secondary Air Injection System Pump
Stu c k O ff
P2448 83H 01H Secondary Air Injection System High
Airflow
Bank1: P2440
Bank2: P2442 84H 01H
Secondary Air Injection System Switch-
ing Valve Stuck Open
P2440 85H 01H Secondary Air Injection System Switch-
ing Valve Stuck Open
P2444 86H 01H Secondary Air Injection System Pump
Stu c k O n
FUEL
SYSTEM 81H
Fuel injection system function
(Bank 1) P0171 or P0172 80H 2FH Long term fuel trim
P0171 or P0172 81H 24H The number of lambda control clamped
82H Fuel injection system function
(Bank 2) P0174 or P0175 80H 2FH Long term fuel trim
P0174 or P0175 81H 24H The number of lambda control clamped
Item
OBD-
MID Self-diagnostic test item DTC Test value and Test
limit
(GST display) Description
TID Unit and
Scaling ID
Revision: December 20092009 QX56

ENGINE CONTROL SYSTEM SYMPTOMSEC-475
< SYMPTOM DIAGNOSIS > [VK56DE]
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SYMPTOM DIAGNOSIS
ENGINE CONTROL SYSTEM SYMPTOMS
Symptom Matrix ChartINFOID:0000000003771739
SYSTEM — BASIC ENGINE CONTROL SYSTEM
SYMPTOM
Refer-
ence page
HARD/NO START/RESTART (EXCP. HA)
ENGINE STALL
HESITATION/SURGING/FLAT SPOT
SPARK KNOCK/DETONATION
LACK OF POWER/POOR ACCELERATION
HIGH IDLE/LOW IDLE
ROUGH IDLE/HUNTING
IDLING VIBRATION
SLOW/NO RETURN TO IDLE
OVERHEATS/WATER TEMPERATURE HIGH
EXCESSIVE FUEL CONSUMPTION
EXCESSIVE OIL CONSUMPTION
BATTERY DEAD (UNDER CHARGE)
Warranty symptom code AA AB AC AD AE AF AG AH AJ AK AL AM HA
Fuel Fuel pump circuit 11232 22 3 2 EC-395
Fuel pressure regulator system 334444444 4EC-487
Injector circuit 11232 22 2EC-392
Evaporative emission system 334444444 4EC-37
Air Positive crankcase ventilation sys-
tem 334444444 41
EC-414
Incorrect idle speed adjustment 1 1 1 1 1 EC-13
Electric throttle control actuator 112332222 2 2EC-351
,
EC-354
,
EC-358
,
EC-360
IgnitionIncorrect ignition timing adjustment 33111 11 1 EC-13
Ignition circuit 11222 22 2EC-404
Main power supply and ground circuit 22333 33 23 EC-82
Revision: December 20092009 QX56

EC-478
< SYMPTOM DIAGNOSIS >[VK56DE]
ENGINE CONTROL SYSTEM SYMPTOMS
1 - 6: The numbers refer to the order of inspection.Exhaust Exhaust manifold/Tube/Muffler/
Gasket 55555 55 5 EM-30
,
EX-
5Three way catalyst
Lubrica-
tion Oil pan/Oil strainer/Oil pump/Oil
filter/Oil gallery/Oil cooler
55555 55 5 EM-33
,
LU-
14 , LU-11 ,
LU-12
Oil level (Low)/Filthy oil LU-8, "In-spection"
Cooling Radiator/Hose/Radiator filler cap
55555 55 45 CO-15
Thermostat 5
CO-22
Water pumpCO-20
Water galleryCO-6
Cooling fan 5CO-18,
CO-
19
Coolant level (Low)/Contaminat-
ed coolant 5
CO-10
IVIS (INFINITI Vehicle Immobilizer System —
NATS) 11
SEC-6
SYMPTOM
Reference
page
HARD/NO START/RESTART (EXCP. HA)
ENGINE STALL
HESITATION/SURGING/FLAT SPOT
SPARK KNOCK/DETONATION
LACK OF POWER/POOR ACCELERATION
HIGH IDLE/LOW IDLE
ROUGH IDLE/HUNTING
IDLING VIBRATION
SLOW/NO RETURN TO IDLE
OVERHEATS/WATER TEMPERATURE HIGH
EXCESSIVE FUEL CONSUMPTION
EXCESSIVE OIL CONSUMPTION
BATTERY DEAD (UNDER CHARGE)
Warranty symptom code AA AB AC AD AE AF AG AH AJ AK AL AM HA
Revision: December 20092009 QX56

PRECAUTIONSEC-483
< PRECAUTION > [VK56DE]
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Do not operate fuel pump when there is no fuel in lines.
 Tighten fuel hose clamps to the specified torque.
 Do not depress accelerator pedal when starting.
 Immediately after starting, do not rev up engine unnecessar-
ily.
 Do not rev up engine just prior to shutdown.
 When installing C.B. ham radio or a mobile phone, be sure to
observe the following as it may adversely affect electronic
control systems depending on installation location.
- Keep the antenna as far as possi ble from the electronic con-
trol units.
- Keep the antenna feeder line more than 20 cm (8 in) away
from the harness of electronic controls.
Do not let them run para llel for a long distance.
- Adjust the antenna and feeder line so that the standing-wave
radio can be kept smaller.
- Be sure to ground the radio to vehicle body.
BBIA0402E
SEF709Y
SEF708Y
Revision: December 20092009 QX56

FUEL PRESSUREEC-487
< ON-VEHICLE MAINTENANCE > [VK56DE]
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ON-VEHICLE MAINTENANCE
FUEL PRESSURE
Fuel Pressure CheckINFOID:0000000003771746
FUEL PRESSURE RELEASE
With CONSULT-IIl
1. Turn ignition switch ON.
2. Perform “FUEL PRESSURE RELEASE” in
“WORK SUPPORT” mode with CONSULT-IIl.
3. Start engine.
4. After engine stalls, crank it two or three times to release all fuel pressure.
5. Turn ignition switch OFF.
Without CONSULT-IIl
1. Remove fuel pump fuse located in IPDM E/R.
2. Start engine.
3. After engine stalls, crank it two or three times to release all fuel pressure.
4. Turn ignition switch OFF.
5. Reinstall fuel pump fuse after servicing fuel system.
FUEL PRESSURE CHECK
CAUTION:
 Before disconnecting fuel line, release fuel pressure from fuel line to eliminate danger.
 Be careful not to scratch or get the fuel hose conn ection area dirty when servicing, so that the quick
connector o-ring maintains sealability.
 Use Fuel Pressure Gauge Kit J-44321 and Fuel Pr essure Adapter J-44321-6 to check fuel pressure.
 Do not perform fuel pressure check with electrical system operating (i.e. lights, rear defog, A/C, etc.).
Fuel pressure gauge may indicate false readings du e to varying engine loads and changes in mani-
fold vacuum.
NOTE:
Prepare pans or saucers under the disconnected fuel line because the fuel may spill out. The fuel pres-
sure cannot be completely released because JA 60 models do not have fuel return system.
1. Release fuel pressure to zero. Refer to "FUEL PRESSURE RELEASE".
2. Remove engine cover.
3. Remove fuel hose using Quick Connector Release J-45488. Refer to EM-40
.
 Do not twist or kink fuel hose because it is plastic hose.
 Do not remove fuel hose from quick connector.
 Keep fuel hose connections clean.
4. Install Fuel Pressure Adapter J-44321-6 and Fuel Pressure Gauge (from kit J-44321) as shown in figure.
 Do not distort or bend fuel rail tube when installing fuel pres-sure gauge adapter.
 When reconnecting fuel hose, check the original fuel hose for damage and abnormality.
5. Turn ignition switch ON (reactivate fuel pump), and check for fuel leakage.
6. Start engine and check for fuel leakage.
7. Read the indication of fuel pressure gauge.  During fuel pressure check, check for fuel leakage from fuel
connection every 3 minutes.
BBIA0380E
BBIA0390E
Revision: December 20092009 QX56

EC-488
< ON-VEHICLE MAINTENANCE >[VK56DE]
FUEL PRESSURE
8. If result is unsatisfactory, go to next step.
9. Check the following.
 Fuel hoses and fuel tubes for clogging
 Fuel filter for clogging
 Fuel pump
 Fuel pressure regulator for clogging
If OK, replace fuel pressure regulator.
If NG, repair or replace.
10. Before disconnecting Fuel Pressure Gauge and Fuel Pressure Adapter J-44321-6, release fuel pressure
to zero. Refer to "FUEL PRESSURE RELEASE". At idling:
Approximately 350 kPa (3.57 kg/cm
2, 51 psi)
Revision: December 20092009 QX56

EVAP LEAK CHECKEC-489
< ON-VEHICLE MAINTENANCE > [VK56DE]
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EVAP LEAK CHECK
How to Detect Fuel Vapor LeakageINFOID:0000000003771747
CAUTION:
 Never use compressed air
or a high pressure pump.
 Do not exceed 4.12 kPa (0.042 kg/cm
2, 0.6 psi) of pressure in EVAP system.
NOTE:
 Do not start engine.
 Improper installation of EVAP service port adapter to the EVAP service port may cause a leak.
WITH CONSULT-IIl
1. Attach the EVAP service port adapter securely to the EVAP service port.
2. Also attach the pressure pump and hose to the EVAP service port adapter.
3. Turn ignition switch ON.
4. Select the “EVAP SYSTEM CLOSE” of “WORK SUPPORT MODE” with CONSULT-IIl.
5. Touch “START”. A bar graph (Pressure indicating display) will appear on the screen.
6. Apply positive pressure to the EVAP system until t he pressure indicator reaches the middle of the bar
graph.
7. Remove EVAP service port adapter and hose with pressure pump.
8. Locate the leak using a leak detector. Refer to EC-37, "Descrip-
tion".
WITHOUT CONSULT-IIl
1. Attach the EVAP service port adapter securely to the EVAP ser-
vice port.
2. Also attach the pressure pump with pressure gauge to the EVAP service port adapter.
SEF200U
BBIA0366E
SEF462UA
Revision: December 20092009 QX56

EC-496
< SERVICE DATA AND SPECIFICATIONS (SDS) [VK56DE]
SERVICE DATA AND SPECIFICATIONS (SDS)
Heated Oxygen sensor 2 Heater
INFOID:0000000003771762
Crankshaft Position Sensor (POS)INFOID:0000000003771763
Refer to EC-200, "Component Inspection".
Camshaft Position Sensor (PHASE)INFOID:0000000003771764
Refer to EC-204, "Component Inspection".
Throttle Control MotorINFOID:0000000003771765
Fuel InjectorINFOID:0000000003771766
Fuel PumpINFOID:0000000003771767
Resistance [at 25 °C (77 °F)] 8 - 10 Ω
Resistance [at 25°C (77 °F)] Approximately 1 - 15 Ω
Resistance [at 10 - 60°C (50 - 140 °F)] 11.1 - 14.5 Ω
Resistance [at 25°C (77 °F)] 0.2 - 5.0 Ω
Revision: December 20092009 QX56