2010 INFINITI QX56 fuel pump

AV-158
< SYMPTOM DIAGNOSIS >[AUDIO SYSTEM]
NORMAL OPERATING CONDITION
NORMAL OPERATING CONDITION
DescriptionINFOID:0000000005146353
AUDIO SYSTEM
The majority of the audio troubles are the result of
outside causes (bad CD, electromagnetic interference,
etc.).
Noise
The following noise results from variations in field strength, such as fading noise and multi-path noise, or
external noise from trains and other sources. It is not a malfunction.
• Fading noise: This noise occurs because of variations in the field strength in a narrow range due to moun-
tains or buildings blocking the signal.
• Multi-path noise: This noise results from the waves s ent directly from the broadcast station arriving at the
antenna at a different time from the waves which reflect off mountains or buildings.
The vehicle itself can be a source of noise if noise prevention parts or electrical equipment is malfunctioning.
Check if noise is caused and/or changed by engine speed, ignition switch turned to each position, and opera-
tion of each piece of electrical equipment, and determine the cause.
NOTE:
The source of the noise can be found easily by listening to the noise while removing the fuses of electrical
components, one by one.
Type of Noise and Possible Cause
NAVIGATION SYSTEM
Basic Operation
Vehicle Mark
Occurrence condition Possible cause
Occurs only when engine is ON. A continuous growling noise occurs. The speed of
the noise varies with changes in the engine speed. • Ignition components
The occurrence of the noise is linked with the operation of the fuel pump. • Fuel pump condenser
Noise only occurs when various
electrical components are oper-
ating. A cracking or snapping sound occurs with the op-
eration of various switches.
• Relay malfunction, AV control unit malfunc-
tion
The noise occurs when various motors are operat-
ing. • Motor case ground
• Motor
The noise occurs constantly, not just under certain conditions. • Rear defogger coil malfunction
• Open circuit in printed heater
• Poor ground of antenna feeder line
A cracking or snapping sound occurs while the vehicle is being driven, especially when
it is vibrating excessively. • Ground wire of body parts
• Ground due to improper part installation
• Wiring connections or a short circuit
Symptom
Cause Remedy
No image is shown. Display brightness adjustment is set fully to DARK
side. Adjust the display brightness.
No guide sound is heard.
Audio guide volume is too low or
too high. Volume control is set to OFF, MIN or MAX. Adjust the audio guide volume.
Audio guidance is not available while the vehicle is
driving on a dark pink route.
System is not malfunctioning.
Screen is too dark.
Motion of the image is too slow. Temperature inside the vehicle is low.
Wait until the temperature inside the vehicle
reaches the proper temperature.
Small black or bright spots appear
on the screen. Symptom peculiar to a liquid crystal display (dis-
play unit). System is not malfunction.
Revision: April 20092010 QX56

EC-6
On Board Diagnosis Logic .....................................353
DTC Confirmation Procedure ................................353
Diagnosis Procedure .............................................353
Component Inspection ...........................................355
P2100, P2103 THROTTLE CONTROL MO-
TOR RELAY .....................................................
356
Component Description ....................................... ..356
On Board Diagnosis Logic .....................................356
DTC Confirmation Procedure ................................356
Diagnosis Procedure .............................................356
P2101 ELECTRIC THROTTLE CONTROL
FUNCTION .......................................................
359
Description ........................................................... ..359
On Board Diagnosis Logic .....................................359
DTC Confirmation Procedure ................................359
Diagnosis Procedure .............................................359
Component Inspection ...........................................362
P2118 THROTTLE CONTROL MOTOR ..........363
Component Description ....................................... ..363
On Board Diagnosis Logic .....................................363
DTC Confirmation Procedure ................................363
Diagnosis Procedure .............................................363
Component Inspection ...........................................364
P2119 ELECTRIC THROTTLE CONTROL
ACTUATOR .....................................................
365
Component Description ....................................... ..365
On Board Diagnosis Logic .....................................365
DTC Confirmation Procedure ................................365
Diagnosis Procedure .............................................366
P2122, P2123 APP SENSOR ..........................367
Component Description ....................................... ..367
On Board Diagnosis Logic .....................................367
DTC Confirmation Procedure ................................367
Diagnosis Procedure .............................................367
Component Inspection ...........................................369
P2127, P2128 APP SENSOR ..........................370
Component Description ....................................... ..370
On Board Diagnosis Logic .....................................370
DTC Confirmation Procedure ................................370
Diagnosis Procedure .............................................370
Component Inspection ...........................................373
P2135 TP SENSOR .........................................374
Component Description ....................................... ..374
On Board Diagnosis Logic .....................................374
DTC Confirmation Procedure ................................374
Diagnosis Procedure .............................................374
Component Inspection ...........................................377
P2138 APP SENSOR ......................................378
Component Description ....................................... ..378
On Board Diagnosis Logic .....................................378
DTC Confirmation Procedure ................................378
Diagnosis Procedure .............................................379
Component Inspection ......................................... .381
P2A00, P2A03 A/F SENSOR 1 ........................382
Component Description ....................................... .382
On Board Diagnosis Logic ....................................382
DTC Confirmation Procedure ................................382
Diagnosis Procedure .............................................383
ASCD BRAKE SWITCH ...................................388
Component Description ....................................... .388
Diagnosis Procedure .............................................388
Component Inspection ..........................................390
ASCD INDICATOR ...........................................391
Component Description ....................................... .391
Diagnosis Procedure .............................................391
COOLING FAN .................................................392
Diagnosis Procedure ............................................ .392
Component Inspection ..........................................392
ELECTRICAL LOAD SIGNAL ..........................394
Description ........................................................... .394
Diagnosis Procedure .............................................394
FUEL INJECTOR ..............................................396
Component Description ....................................... .396
Diagnosis Procedure .............................................396
Component Inspection ..........................................398
FUEL PUMP .....................................................399
Description ........................................................... .399
Diagnosis Procedure .............................................399
Component Inspection ..........................................402
ICC BRAKE SWITCH ..................................... ..403
Component Description ....................................... .403
Diagnosis Procedure .............................................403
Component Inspection ..........................................405
IGNITION SIGNAL ............................................407
Component Description ....................................... .407
Diagnosis Procedure .............................................407
Component Inspection ..........................................410
ON BOARD REFUELING VAPOR RECOV-
ERY (ORVR) .....................................................
412
System Description .............................................. .412
Diagnosis Procedure .............................................412
Component Inspection ..........................................414
POSITIVE CRANKCASE VENTILATION .........417
Description ........................................................... .417
Component Inspection ..........................................417
REFRIGERANT PRESSURE SENSOR ...........419
Component Description ....................................... .419
Diagnosis Procedure .............................................419
ECU DIAGNOSIS ......................................422
ECM ................................................................ ..422
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CONSULT-lll Reference Va
lue in Data Monitor
Mode ................................................................... ..
422
ECM Harness Connector Terminal Layout ...........425
ECM Terminal and Reference Value ....................425
Wiring Diagram - ENGINE CONTROL SYSTEM - ..435
Fail-Safe Chart .................................................... ..456
DTC Inspection Priority Chart ............................. ..458
DTC Index ........................................................... ..459
Emission-related Diagnostic Information ...............463
SYMPTOM DIAGNOSIS ..... .......................477
ENGINE CONTROL SYSTEM SYMPTOMS .. ..477
Symptom Matrix Chart ........................................ ..477
NORMAL OPERATING CONDITION ...............481
Fuel Cut Control (at No Load and High Engine
Speed) ................................................................. ..
481
PRECAUTION ............................................482
PRECAUTIONS .............................................. ..482
Precaution for Supplemental Restraint System
(SRS) "AIR BAG" and "SEAT BELT PRE-TEN-
SIONER" ............................................................. ..
482
On Board Diagnosis (OBD) System of Engine and
A/T .........................................................................
482
Precaution .............................................................482
PREPARATION .........................................486
PREPARATION .............................................. ..486
Special Service Tool ........................................... ..486
Commercial Service Tool ......................................487
ON-VEHICLE MAINTENANCE ..................489
FUEL PRESSURE ...........................................489
Fuel Pressure Check ........................................... ..489
EVAP LEAK CHECK ......................................491
How to Detect Fuel Vapor Leakage .......................491
ON-VEHICLE REPAIR ...............................493
EVAP CANISTER ............................................493
Removal and Installation ..................................... ..493
Component Inspection ...........................................493
INTAKE VALVE TIMING CONTROL ..............494
Intake Valve Timing Control Solenoid Valve (LH) ..494
Intake Valve Timing Cont rol Solenoid Valve (RH) ..494
Intake Valve Timing Control Position Sensor (LH) ..495
Intake Valve Timing Control Position Sensor (RH) ..495
Camshaft Position Sensor (PHASE) .....................495
SERVICE DATA AND SPECIFICATIONS
(SDS) ............... .......................................... .
497
SERVICE DATA AND SPECIFICATIONS
(SDS) ...............................................................
497
Fuel Pressure ...................................................... ..497
Idle Speed and Ignition Timing ..............................497
Calculated Load Value ..........................................497
Mass Air Flow Sensor ............................................497
Intake Air Temperature Sensor .............................497
Engine Coolant Temperature Sensor ....................497
A/F Sensor 1 Heater ..............................................497
Heated Oxygen sensor 2 Heater ...........................498
Crankshaft Position Sensor (POS) ........................498
Camshaft Position Sensor (PHASE) .....................498
Throttle Control Motor ............................................498
Fuel Injector ...........................................................498
Fuel Pump .............................................................498
Revision: April 20092010 QX56

EC-52
< FUNCTION DIAGNOSIS >[VK56DE]
ON BOARD DIAGNOSTIC (OBD) SYSTEM
SEC-
OND-
ARY AIR71H 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
St uc k Off
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
St uc k On
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
DTCTest value and Test
limit
(GST display) Description
TID Unit and
Scaling ID
Revision: April 20092010 QX56

ON BOARD DIAGNOSTIC (OBD) SYSTEMEC-65
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X: Applicable
*1: This item includes 1st trip DTCs.
*2: This mode includes 1st trip freeze frame data or freeze frame data. The items appear on CONSULT-III screen in freeze frame
data
mode only if a 1st trip DTC or DTC is detected. For details, refer to “Freeze Frame Data and 1st Trip Freeze Frame Data”.
*3: Always “CMPLT ” is displayed.
WORK SUPPORT MODE
Work Item
ENGINE CONTROL COMPONENT PARTS
OUTPUT
Fuel injector ××
Power transistor (Ignition timing) ××
Throttle contro l motor relay ××
Throttle control motor ×
EVAP canister purge volume con-
trol solenoid valve ××
××
Air conditioner relay ×
Fuel pump relay ×× ×
Cooling fan relay ×××
Air fuel ratio (A/F) sensor 1 heater ×××*3
Heated oxygen sensor 2 heater ×××*3
EVAP canister vent control valve ×× ××
Intake valve timing control solenoid
valve ××
×
Alternator ××
Calculated load value ××
Item
DIAGNOSTIC TEST MODE
WORK SUP-
PORT SELF-DIAGNOSTIC
RESULTS DATA
MONI- TOR ACTIVE
TEST DTC & SRT
CONFIRMATION
DTC*1 FREEZE
FRAME
DATA*2 SRT
STATUS DTC
WORK SUP-
PORT
WORK ITEM CONDITION USAGE
FUEL PRESSURE RELEASE • FUEL PUMP WILL STOP BY TOUCHING “START” DUR- ING IDLING.
CRANK A FEW TIMES AFTER ENGINE STALLS. When releasing fuel pressure from
fuel line
IDLE AIR VOL LEARN • THE IDLE AIR VOLUME THAT KEEPS THE ENGINE
WITHIN THE SPECIFIED RANGE IS MEMORIZED IN
ECM. When learning the idle air volume
SELF-LEARNING CONT • THE COEFFICIENT OF SELF-LEARNING CONTROL
MIXTURE RATIO RETURNS TO THE ORIGINAL COEF-
FICIENT. When clearing the coefficient of
self-learning control value
Revision: April 20092010 QX56

ON BOARD DIAGNOSTIC (OBD) SYSTEMEC-69
< FUNCTION DIAGNOSIS > [VK56DE]
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PURG VOL C/V [%]
• Indicates the EVAP canister purge vol-
ume control solenoid valve control value
computed by the ECM according to the
input signals.
• The opening becomes larger as the val- ue increases.
INT/V TIM (B1)
[ ° CA]
• Indicates [°CA] of intake camshaft ad-
vanced angle.
INT/V TIM (B2)
[ ° CA]
INT/V SOL (B1) [%] • The control value of the intake valve tim-
ing control solenoid valve (determined by
ECM according to the input signals) is in-
dicated.
• The advance angle becomes larger as
the value increases.
INT/V SOL (B2) [%]
AIR COND RLY
[ON/OFF]
• The air conditioner relay control condi-
tion (determined by ECM according to
the input signals) is indicated.
FUEL PUMP RLY
[ON/OFF] • Indicates the fuel pump relay control con-
dition determined by ECM according to
the input signals.
VENT CONT/V
[ON/OFF] • The control condition of the EVAP canis-
ter vent control valve (determined by
ECM according to the input signals) is in-
dicated.
ON: Closed
OFF: Open
THRTL RELAY [ON/
OFF] ו Indicates the throttle control motor relay
control condition determined by the ECM
according to the input signals.
COOLING FAN
[HI/OFF] ו The control condition of the cooling fan
(determined by ECM according to the in-
put signals) is indicated.
HI: High speed operation
OFF: Stop
HO2S2 HTR (B1)
[ON/OFF] • Indicates [ON/OFF] condition of heated
oxygen sensor 2 heater determined by
ECM according to the input signals.
HO2S2 HTR (B2)
[ON/OFF]
I/P PULLY SPD
[rpm] • Indicates the engine speed computed
from the turbine revolution sensor signal.
VEHICLE SPEED
[km/h] or [mph] • Indicates the vehicle speed computed
from the revolution sensor signal.
IDL A/V LEARN
[YET/CMPLT] • Display the condition of idle air volume
learning
YET: Idle Air Volume Learning has not
been performed yet.
CMPLT: Idle Air Volume Learning has al-
ready been performed successfully.
TRVL AFTER MIL
[km] or [mile] • Distance traveled while MIL is activated.
Monitored item
[Unit] ECM IN-
PUT SIG-
NALS MAIN
SIGNALS Description
Remarks
Revision: April 20092010 QX56

ON BOARD DIAGNOSTIC (OBD) SYSTEMEC-71
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*: Leaving cooling fan OFF with CONSULT-III while engine is running may cause the engine to overheat.
DTC & SRT CONFIRMATION MODE
SRT STATUS Mode
For details, refer to
EC-459, "DTC Index".
SRT WORK SUPPORT Mode
This mode enables a technician to drive a vehicle to set the SRT while monitoring the SRT status.
DTC WORK SUPPORT Mode
TEST ITEM CONDITION JUDGEMENTCHECK ITEM (REMEDY)
FUEL INJEC-
TION • Engine: Return to the original
trouble condition
• Change the amount of fuel injec-
tion using CONSULT-III. If trouble symptom disappears, see
CHECK ITEM.
• Harness and connectors
• Fuel injector
• Air fuel ratio (A/F) sensor 1
IGNITION TIM-
ING • Engine: Return to the original
trouble condition
• Timing light: Set
• Retard the ignition timing using
CONSULT-III. If trouble symptom disappears, see
CHECK ITEM.
• Perform Idle Air Volume Learning.
POWER BAL-
ANCE • Engine: After warming up, idle the
engine.
• A/C switch: OFF
• Selector lever: P or N
• Cut off each injector signal one at a time using CONSULT-III. Engine runs rough or dies.
• Harness and connectors
• Compression
• Fuel injector
• Power transistor
•Spark plug
• Ignition coil
COOLING FAN* • Ignition switch: ON
• Turn the cooling fan HI and OFF
using CONSULT-III. Cooling fan moves and stops. • Harness and connectors
• Cooling fan motor
•IPDM E/R
ENG COOLANT
TEMP • Engine: Return to the original
trouble condition
• Change the engine coolant tem- perature using CONSULT-III. If trouble symptom disappears, see
CHECK ITEM. • Harness and connectors
• Engine coolant temperature sen-
sor
• Fuel injector
FUEL PUMP RE-
LAY • Ignition switch: ON
(Engine stopped)
• Turn the fuel pump relay ON and OFF using CONSULT-III and lis-
ten to operating sound. Fuel pump relay makes the operat-
ing sound.
• Harness and connectors
• Fuel pump relay
PURG VOL
CONT/V • Engine: After warming up, run en-
gine at 1,500 rpm.
• Change the EVAP canister purge
volume control solenoid valve
opening percent using CON-
SULT-III. Engine speed changes according to
the opening percent.
• Harness and connectors
• Solenoid valve
FUEL/T TEMP
SEN • Change the fuel tank temperature using CONSULT-III.
VENT CON-
TROL/V • Ignition switch: ON
(Engine stopped)
• Turn solenoid valve ON and OFF with the CONSULT-III and listen
to operating sound. Solenoid valve makes an operating
sound.
• Harness and connectors
• Solenoid valve
V/T ASSIGN AN-
GLE • Engine: Return to the original
trouble condition
• Change intake valve timing using
CONSULT-III. If trouble symptom disappears, see
CHECK ITEM.
• Harness and connectors
• Intake valve timing control sole-
noid valve
ALTERNATOR
DUTY •
E
ngine: Idle
• Change duty ratio using CON- SULT-III. Battery voltage changes. • Harness and connectors
•IPDM E/R
• Alternator
Revision: April 20092010 QX56

TROUBLE DIAGNOSIS - SPECIFICATION VALUEEC-77
< COMPONENT DIAGNOSIS > [VK56DE]
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Check “A/F ALPHA-B1”, “A/F ALPHA-B2” for approximat
ely 1 minute because they may fluctuate. It is NG
if the indication is out of the SP value even a little.
OK or NG
OK >> GO TO 17.
NG (Less than the SP value)>>GO TO 2.
NG (More than the SP value)>>GO TO 3.
2.CHECK “B/FUEL SCHDL”
Select “B/FUEL SCHDL” in “SPEC” of “DATA MONITOR” m ode, and make sure that the indication is within the
SP value.
OK or NG
OK >> GO TO 4.
NG (More than the SP value)>>GO TO 19.
3.CHECK “B/FUEL SCHDL”
Select “B/FUEL SCHDL” in “SPEC” of “DATA MONITOR” m ode, and make sure that the indication is within the
SP value.
OK or NG
OK >> GO TO 6.
NG (More than the SP value)>>GO TO 6.
NG (Less than the SP value)>>GO TO 25.
4.CHECK “A/F ALPHA-B1”, “A/F ALPHA-B2”
1. Stop the engine.
2. Disconnect PCV hose, and then plug it.
3. Start engine.
4. Select “A/F ALPHA-B1”, “A/F ALPHA-B2” in “SPEC” of “DATA MONITOR” mode, and make sure that the each indication is within the SP value.
OK or NG
OK >> GO TO 5.
NG >> GO TO 6.
5.CHANGE ENGINE OIL
1. Stop the engine.
2. Change engine oil. NOTE:
This symptom may occur when a large amount of gas oline is mixed with engine oil because of driving
conditions (such as when engine oil temperature does not rise enough since a journey distance is too
short during winter). The symptom will not be detect ed after changing engine oil or changing driving con-
dition.
>>INSPECTION END
6.CHECK FUEL PRESSURE
Check fuel pressure. (Refer to EC-489, "
Fuel Pressure Check".)
OK or NG
OK >> GO TO 9.
NG (Fuel pressure is too high)>>Replace fuel pressure regulator, refer to EC-489, "
Fuel Pressure Check".
GO TO 8.
NG (Fuel pressure is too low)>>GO TO 7.
7.DETECT MALFUNCTIONING PART
1. Check the following.
- Clogged and bent fuel hose and fuel tube
- Clogged fuel filter
- Fuel pump and its circuit (Refer to EC-489, "
Fuel Pressure Check".)
2. If NG, repair or replace the malfunctioning part. (Refer to EC-489, "
Fuel Pressure Check".)
If OK, replace fuel pressure regulator.
Revision: April 20092010 QX56