2011 INFINITI QX56 Vvel relay

EC-1
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CONTENTS
ENGINE CONTROL SYSTEM
VK56VD
PRECAUTION ................ ...............................
9
PRECAUTIONS .............................................. .....9
Precaution for Supplemental Restraint System
(SRS) "AIR BAG" and "SEAT BELT PRE-TEN-
SIONER" ............................................................. ......
9
Precaution for Procedure without Cowl Top Cover ......9
Precautions For Xenon Headlamp Service ...............9
On Board Diagnostic (OBD) System of Engine
and A/T ....................................................................
10
General Precautions ...............................................10
PREPARATION ...........................................14
PREPARATION .............................................. ....14
Special Service Tools .......................................... ....14
Commercial Service Tools ......................................14
SYSTEM DESCRIPTION .............................16
COMPONENT PARTS ................................... ....16
Component Parts Location .................................. ....16
Component Description ...........................................19
Accelerator Pedal Position Sensor ..........................21
Air Fuel Ratio (A/F) Sensor 1 ..................................21
ASCD Brake Switch & Stop Lamp Switch ...............21
ASCD Steering Switch ............................................21
ASCD Indicators ......................................................21
Battery Current Sensor (With Battery Tempera-
ture Sensor) ............................................................
22
Camshaft Position Sensor .......................................22
Crankshaft Position Sensor .....................................23
ECM ........................................................................23
Electric Throttle Control Actuator ............................23
Electrically-controlled cooling fan coupling .............24
Engine Coolant Temperature Sensor ......................25
Engine Oil Temperature Sensor ..............................25
EVAP Control System Pressure Sensor .................26
EVAP Canister Vent Control Valve .........................26
EVAP Canister Purge Volume Control Solenoid
Valve .................................................................... ....
26
Fuel Injector .............................................................26
Fuel Level Sensor ....................................................26
Fuel Pump Control Module ......................................27
Fuel Rail Pressure Sensor .......................................27
Fuel Tank Temperature Sensor ...............................27
Heated Oxygen Sensor 2 ........................................27
High Pressure Fuel Pump .......................................28
ICC Brake Switch & Stop Lamp Switch ...................29
ICC Steering Switch ................................................29
Ignition Coil With Power Transistor .........................29
Intake Valve Timing Control Solenoid Valve ...........29
Knock Sensor ...................................................... ....30
Low Fuel Pressure Sensor ......................................30
Low Pressure Fuel Pump ........................................30
Malfunction Indicator Lamp (MIL) ............................30
Manifold Absolute Pressure Sensor ........................31
Mass Air Flow Sensor (With Intake Air Tempera-
ture Sensor) .............................................................
31
Power Steering Pressure (PSP) Sensor ..................31
Refrigerant Pressure Sensor ............................... ....32
VVEL Actuator Motor ...............................................32
VVEL Actuator Motor Relay .....................................32
VVEL Control Module ..............................................32
VVEL Control Shaft Position Sensor .......................32
STRUCTURE AND OPERATION .....................33
Positive Crankcase Ventilation ................................33
On Board Refueling Vapor Recovery (ORVR) ........34
SYSTEM ............................................................35
ENGINE CONTROL SYSTEM ........................ ...........35
ENGINE CONTROL SYSTEM : System Diagram ....35
ENGINE CONTROL SYSTEM : System Descrip-
tion ...........................................................................
35
DIRECT INJECTION GASOLINE SYSTEM .......... ....36
DIRECT INJECTION GASOLINE SYSTEM :
System Diagram .....................................................
36
Revision: 2010 May2011 QX56

EC-6
DTC Logic ..............................................................364
Diagnosis Procedure .............................................365
P0527 COOLING FAN SPEED SENSOR .......367
DTC Logic ............................................................ ..367
Diagnosis Procedure .............................................367
Component Inspection (Cooling Fan Speed Sen-
sor) ........................................................................
369
P0550 PSP SENSOR .......................................371
DTC Logic ............................................................ ..371
Diagnosis Procedure .............................................371
Component Inspection (Power Steering Pressure
Sensor) ..................................................................
373
P0603 ECM POWER SUPPLY ........................374
DTC Logic ............................................................ ..374
Diagnosis Procedure .............................................374
P0605 ECM ......................................................376
DTC Logic ............................................................ ..376
Diagnosis Procedure .............................................376
P0607 ECM ......................................................378
DTC Logic ............................................................ ..378
Diagnosis Procedure .............................................378
P0611 ECM PROTECTION .............................379
Description ........................................................... ..379
DTC Logic ..............................................................379
Diagnosis Procedure .............................................379
P062B ECM .....................................................380
Description ........................................................... ..380
DTC Logic ..............................................................380
Diagnosis Procedure .............................................380
P0643 SENSOR POWER SUPPLY .................381
DTC Logic ............................................................ ..381
Diagnosis Procedure .............................................381
P0850 PNP SWITCH .......................................383
Description ........................................................... ..383
DTC Logic ..............................................................383
Component Function Check ..................................384
Diagnosis Procedure .............................................384
P1087, P1088 VVEL SYSTEM ........................386
DTC Logic ............................................................ ..386
Diagnosis Procedure .............................................386
P1089, P1092 VVEL CONTROL SHAFT PO-
SITION SENSOR .............................................
387
DTC Logic ............................................................ ..387
Diagnosis Procedure .............................................387
P1090, P1093 VVEL ACTUATOR MOTOR .....390
DTC Logic ............................................................ ..390
Diagnosis Procedure .............................................390
Component Inspection (VVEL ACTUATOR MO-
TOR ASSEMBLY) .................................................
392
Component Inspection (VVEL ACTUATOR
HOUSING ASSEMBLY) ......... ...............................
392
P1091 VVEL ACTUATOR MOTOR RELAY ... ..393
DTC Logic ............................................................ .393
Diagnosis Procedure .............................................393
Component Inspection (VVEL Actuator Motor Re-
lay) ....................................................................... .
395
P1148, P1168 CLOSED LOOP CONTROL .....396
DTC Logic ............................................................ .396
Diagnosis Procedure .............................................396
P1197 OUT OF GAS ........................................397
Description ........................................................... .397
DTC Logic .............................................................397
Diagnosis Procedure .............................................398
P1212 TCS COMMUNICATION LINE ..............399
Description ........................................................... .399
DTC Logic .............................................................399
Diagnosis Procedure .............................................399
P1217 ENGINE OVER TEMPERATURE .........400
DTC Logic ............................................................ .400
Component Function Check .................................400
Diagnosis Procedure .............................................401
P1220 FUEL PUMP CONTROL MODULE
(FPCM) ..............................................................
403
DTC Logic ............................................................ .403
Diagnosis Procedure .............................................403
Component Inspection (FPCM) ............................405
P1225 TP SENSOR ..........................................406
DTC Logic ............................................................ .406
Diagnosis Procedure .............................................406
P1226 TP SENSOR ..........................................407
DTC Logic ............................................................ .407
Diagnosis Procedure .............................................407
P1421 COLD START CONTROL .....................408
Description ........................................................... .408
DTC Logic .............................................................408
Diagnosis Procedure .............................................408
P1423, P1424 COLD START CONTROL ........410
Description ........................................................... .410
DTC Logic .............................................................410
Diagnosis Procedure .............................................410
P1550 BATTERY CURRENT SENSOR ...........412
DTC Logic ............................................................ .412
Diagnosis Procedure .............................................412
Component Inspection (Battery Current Sensor) ..414
P1551, P1552 BATTERY CURRENT SEN-
SOR ..................................................................
416
DTC Logic ............................................................ .416
Diagnosis Procedure .............................................416
Component Inspection (Battery Current Sensor) ..419
Revision: 2010 May2011 QX56

EC-7
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P1553 BATTERY CURRENT SENSOR ......... ..420
DTC Logic ........................................................... ..420
Diagnosis Procedure .............................................420
Component Inspection (Battery Current Sensor) ..423
P1554 BATTERY CURRENT SENSOR ...........424
DTC Logic ........................................................... ..424
Component Function Check ..................................424
Diagnosis Procedure .............................................425
Component Inspection (Battery Current Sensor) ..427
P1556, P1557 BATTERY TEMPERATURE
SENSOR ...........................................................
428
DTC Logic ........................................................... ..428
Diagnosis Procedure .............................................428
Component Inspection (Battery Temprature Sen-
sor) ........................................................................
430
P1564 ASCD STEERING SWITCH ..................431
DTC Logic ........................................................... ..431
Diagnosis Procedure .............................................431
Component Inspection (ASCD Steering Switch) ...433
P1564 ICC STEERING SWITCH ......................434
DTC Logic ........................................................... ..434
Diagnosis Procedure .............................................434
Component Inspection (ICC Steering Switch) .......436
P1568 ICC FUNCTION .....................................437
DTC Logic ........................................................... ..437
Diagnosis Procedure .............................................437
P1572 ASCD BRAKE SWITCH .......................438
DTC Logic ........................................................... ..438
Diagnosis Procedure .............................................439
Component Inspection (ASCD Brake Switch) .......442
Component Inspection (Stop Lamp Switch) ..........442
P1572 ICC BRAKE SWITCH ...........................443
DTC Logic ........................................................... ..443
Diagnosis Procedure .............................................444
Component Inspection (ICC Brake Switch) ...........445
Component Inspection (Stop Lamp Switch) ..........446
P1574 ASCD VEHICLE SPEED SENSOR ......447
Description .......................................................... ..447
DTC Logic .............................................................447
Diagnosis Procedure .............................................447
P1574 ICC VEHICLE SPEED SENSOR ..........449
Description .......................................................... ..449
DTC Logic .............................................................449
Diagnosis Procedure .............................................449
P1606 VVEL CONTROL MODULE ..................451
DTC Logic ........................................................... ..451
Diagnosis Procedure .............................................451
P1607 VVEL CONTROL MODULE ..................452
DTC Logic ........................................................... ..452
Diagnosis Procedure .............................................452
P1608 VVEL SENSOR POWER SUPPLY ......453
DTC Logic ............................................................ ..453
Diagnosis Procedure .............................................453
P1805 BRAKE SWITCH .................................455
DTC Logic ..............................................................455
Diagnosis Procedure .............................................455
Component Inspection (Stop Lamp Switch) ..........456
P2100, P2103 THROTTLE CONTROL MO-
TOR RELAY ....................................................
458
DTC Logic ..............................................................458
Diagnosis Procedure .............................................458
P2101 ELECTRIC THROTTLE CONTROL
FUNCTION ......................................................
460
Description ........................................................... ..460
DTC Logic ..............................................................460
Diagnosis Procedure .............................................460
Component Inspection ...........................................462
Special Repair Requirement ..................................463
P2118 THROTTLE CONTROL MOTOR .........464
DTC Logic ..............................................................464
Diagnosis Procedure .............................................464
Component Inspection (Electric Throttle Control
Motor) ....................................................................
465
P2119 ELECTRIC THROTTLE CONTROL
ACTUATOR .....................................................
466
DTC Logic ..............................................................466
Diagnosis Procedure .............................................466
P2122, P2123 APP SENSOR .........................468
DTC Logic ..............................................................468
Diagnosis Procedure .............................................468
Component Inspection (Accelerator Pedal Posi-
tion Sensor) ...........................................................
470
P2127, P2128 APP SENSOR .........................471
DTC Logic ..............................................................471
Diagnosis Procedure .............................................471
Component Inspection (Accelerator Pedal Posi-
tion Sensor) ...........................................................
474
P2135 TP SENSOR .........................................475
DTC Logic ..............................................................475
Diagnosis Procedure .............................................475
Component Inspection (Throttle Position Sensor) ..476
P2138 APP SENSOR ......................................478
DTC Logic ..............................................................478
Diagnosis Procedure .............................................478
Component Inspection (Accelerator Pedal Posi-
tion Sensor) ...........................................................
481
P2539, P2541, P2542 LOW FUEL PRES-
SURE SENSOR ...............................................
483
DTC Logic ..............................................................483
Diagnosis Procedure .............................................483
Component Inspection ...........................................485
Revision: 2010 May2011 QX56

EC-20
< SYSTEM DESCRIPTION >[VK56VD]
COMPONENT PARTS
High pressure fuel pump
EC-28, "High Pressure Fuel Pump"
Low pressure fuel pumpEC-30, "Low Pressure Fuel Pump"
Fuel pump control module (FPCM)EC-27, "Fuel Pump Control Module"
Fuel rail pressure sensorEC-27, "Fuel Rail Pressure Sensor"
Low fuel pressure sensorEC-30, "Low Fuel Pressure Sensor"
Fuel injectorEC-26, "Fuel Injector"
Fuel level sensorEC-26, "Fuel Level Sensor"
Fuel tank temperature sensorEC-27, "Fuel Tank Temperature Sensor"
A/F sensor 1
EC-21, "Air Fuel Ratio (A/F) Sensor 1"A/F sensor 1 heater
Heated oxygen sensor 2EC-27, "
Heated Oxygen Sensor 2"Heated oxygen sensor 2 heater
Manifold absolute pressure sensorEC-31, "
Manifold Absolute Pressure Sensor"
Knock sensorEC-30, "Knock Sensor"
Engine oil temperature sensorEC-25, "Engine Oil Temperature Sensor"
Power steering pressure sensorEC-31, "Power Steering Pressure (PSP) Sensor"
Electrically-controlled cooling fan coupling EC-24, "Electrically-controlled cooling fan coupling"
Intake valve timing control solenoid valveEC-29, "Intake Valve Timing Control Solenoid Valve"
VVEL control moduleEC-32, "VVEL Control Module"
VVEL actuator motor relayEC-32, "VVEL Actuator Motor Relay"
VVEL actuator motorEC-32, "VVEL Actuator Motor"
VVEL control shaft position sensor EC-32, "VVEL Control Shaft Position Sensor"
EVAP control system pressure sensor EC-26, "EVAP Control System Pressure Sensor"
EVAP canister vent control valveEC-26, "EVAP Canister Vent Control Valve"
EVAP canister purge volume control solenoid valveEC-26, "EVAP Canister Purge Volume Control Solenoid Valve"
Battery current sensor (with battery temperature sensor)EC-22, "Battery Current Sensor (With Battery Temperature Sen-
sor)"
Refrigerant pressure sensor
EC-32, "Refrigerant Pressure Sensor"
Stop lamp switch
EC-21, "ASCD Brake Switch & Stop Lamp Switch"ASCD brake switch
ASCD steering switchEC-21, "
ASCD Steering Switch"
Information displayEC-49, "AUTMATIC SPEED CONTROL DEVICE (ASCD) : Switch
Name and Function"
Stop lamp switch
EC-29, "ICC Brake Switch & Stop Lamp Switch"ICC brake switch
ICC steering switchEC-29, "
ICC Steering Switch"
Component Reference
Revision: 2010 May2011 QX56

EC-32
< SYSTEM DESCRIPTION >[VK56VD]
COMPONENT PARTS
Refrigerant Pressure Sensor
INFOID:0000000006217690
The refrigerant pressure sensor is installed at the c ondenser of the air conditioner system. The sensor uses an
electrostatic volume pressure transducer to convert refrigerant pressure to voltage. The voltage signal is sent
to ECM, and ECM controls cooling fan system.
VVEL Actuator MotorINFOID:0000000006217691
The VVEL actuator motor rotates the control shaft acco rding to the control signal from the VVEL control mod-
ule. The VVEL control module judges whether the VVEL actuator motor controls the angle properly by the
VVEL control shaft position sensor signal.
VVEL Actuator Motor RelayINFOID:0000000006217692
Power supply for the VVEL actuator motor is provided to the VVEL control module via VVEL actuator motor
relay. VVEL actuator motor relay is ON/OFF controll ed by the VVEL control module. In addition, when the
VVEL actuator motor relay cannot be controlled by the VVEL control module for some reason, it ON/OFF con-
trolled by ECM.
VVEL Control ModuleINFOID:0000000006217693
The VVEL control module consists of a microcomputer and connec-
tors for signal input and output and for power supply. The VVEL con-
trol module controls VVEL system.
VVEL Control Shaft Position SensorINFOID:0000000006217694
VVEL control shaft position sensor detects the control shaft position
angle.
A magnet is installed to the tip of the control shaft.
The magnetic field changes as the control shaft rotates. This
changes output voltage of the VVEL control shaft position sensor.
VVEL control module detects the actual position angle through the
voltage change and sends the signal to ECM.
PBIB2657E
JMBIA0879ZZ
JSBIA0466ZZ
Revision: 2010 May2011 QX56

EC-90
< ECU DIAGNOSIS INFORMATION >[VK56VD]
ECM
111
(R) 175
(B) Fuel injector driver power supply Input [Ignition switch: ON]
BATTERY VOLTAGE
(11 - 14 V)
11 2
(SB) 175
(B) Fuel injector driver power supply Input [Ignition switch: ON] BATTERY VOLTAGE
(11 - 14 V)
11 4 (B) — ECM ground — — —
11 5 (B) — ECM ground — — —
120 (Y) 175
(B) EVAP canister vent control valve Output [Ignition switch: ON] BATTERY VOLTAGE
(11 - 14 V)
122
(BR/ W) 175
(B) VVEL actuator motor relay abort
signal (VVEL control module)
Input [Ignition switch: ON] 0 V
123
(V/R) 175
(B) Throttle control mo
tor relay Output [Ignition switch: ON
→ OFF] 0 - 1.0 V
↓
BATTERY VOLTAGE
(11 - 14 V)
↓
0 V
[Ignition switch: ON] 0 - 1.0 V
125
(GR) 175
(B) Fuel pump control module
(FPCM)
Output[When cranking engine] 0 - 0.5 V
[Engine is running]
 Warm-up condition
0 - 4.0 V
126 (O) 129
(P/L) Accelerator pedal position sen-
sor 2
Input[Ignition switch: ON]
 Engine: Stopped
 Accelerator pedal: Fully released
0.28 - 0.48 V
[Ignition switch: ON]
 Engine: Stopped
 Accelerator pedal: Fully depressed 2.0 - 2.5 V
128 (Y) 130
(R) ASCD steering switch Input [Ignition switch: ON]
 ASCD steering switch: OFF
4 V
[Ignition switch: ON]
 MAIN switch: Pressed 0 V
[Ignition switch: ON]
 CANCEL switch: Pressed 1 V
[Ignition switch: ON]
 RESUME/ACCELERATE switch: Pressed 3 V
[Ignition switch: ON]
 SET/COAST switch: Pressed 2 V
Te r m i n a l N o .
(Wire color) Description
ConditionVa l u e
(Approx.)
+ – Signal name Input/
Output
JPBIA3344ZZ
Revision: 2010 May2011 QX56

EC-94
< ECU DIAGNOSIS INFORMATION >[VK56VD]
ECM
DTC No. Detected items Engine operating condition in fail-safe mode
U0113
U1003
U1024 Can communication circuit VVEL actuator
motor relay is turned off, and VVEL value is become at a minimum angle.
Engine speed will not rise more than 3,500 rpm due to the fuel cut.
P0011
P0021 Intake valve timing control The signal is not energized to the intake valve timing control solenoid valve and the valve
control does not function.
P0087 FRP control system  Engine torque is limited.
 VVEL value is maintained at a fixed angle.
P0088 Engine speed is limited.
P008A Low fuel pressure control
system Engine torque is limited.
P0090 FRP control system  Engine torque is limited.
 VVEL value is maintained at a fixed angle.
P0102
P0103 Mass air flow sensor circuit Engine speed will not rise more than 2,400 rpm due to the fuel cut.
P0117
P0118 Engine coolant tempera-
ture sensor circuit
Engine coolant temperature will be determined by ECM based on the following condition.
CONSULT-III displays the engine coolant temperature decided by ECM.
Condition Engine coolant temperature decided
(CONSULT-III display)
Just as ignition switch is turned ON
or START 40
°C (104 °F)
Approx. 4 minutes or more after
engine starting 80
°C (176 °F)
Except as shown above 40 - 80 °C (104 - 176 °F)
(Depends on the time)
When the fail-safe system for engine coolant temperature sensor is activated, the cooling
fan operates while engine is running.
P0122
P0123
P0222
P0223
P2135 Throttle position sensor The ECM controls the electric throttle control actuator in regulating the throttle opening in
order for the idle position to be within +10 degrees.
The ECM regulates the opening speed of the throttle valve to be slower than the normal
condition.
Therefore, the acceleration will be poor.
P0190 FRP sensor  Engine speed is limited.
 High pressure fuel pump is activated at maximum discharge pressure.
P0201
P0202
P0203
P0204
P0205
P0206
P0207
P0208 Injector  Engine torque is limited.
 Fuel injection shut-off of malfunction cylinder.
 Mixture ratio feedback control does not function.
 Idle engine speed is increased.
P0500 Vehicle speed sensor The cooling fan operates (Highest) while engine is running.
P0524 Engine oil pressure The signal is not energized to the intake valve timing control solenoid valve and the valve
control does not function.
Engine speed will not rise more than 2,400 rpm due to the fuel cut.
P0605 ECM (When ECM calculation function is malfunctioning:)
ECM stops the electric throttle control actuator control, throttle valve is maintained at a
fixed opening (approx. 5 degrees) by the return spring.
ECM deactivates ASCD operation.
P0607 ECM VVEL actuator motor relay is
turned off, and VVEL value is become at a minimum angle.
Engine speed will not rise more than 3,500 rpm due to the fuel cut.
Revision: 2010 May2011 QX56

ECM
EC-95
< ECU DIAGNOSIS INFORMATION > [VK56VD]
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P062B ECM Type1
 Engine torque is limited.
 Idle engine speed is increased.
 Fuel injector power supply shut-off.
 High fuel pressure limitation.
Typ e2
 Engine torque is limited.
 Fuel injection shut-off of malfunction cylinder.
 Mixture ratio feedback control does not function.
 Idle engine speed is increased.
P0643 Sensor power supply ECM stops the electric throttle control actuator control, throttle valve is maintained at a
fixed opening (approx. 5 degrees) by the return spring.
P1087
P1088 VVEL control function VVEL of no
rmal bank is controlled at VVEL angle of abnormal bank.
Engine speed will not rise more than 3,500 rpm due to the fuel cut.
P1089
P1092 VVEL control shaft position
sensor VVEL value is maintained at a fixed angle.
Engine speed will not rise more than 3,500 rpm due to the fuel cut
P1197 Out of gas  Engine torque is limited.
 VVEL value is maintained at a fixed angle.
P1608 VVEL control shaft position
sensor VVEL actuator motor relay is turned off, an
d VVEL value is become at a minimum angle.
Engine speed will not rise more than 3,500 rpm due to the fuel cut.
P1090
P1093 VVEL actuator motor VVEL of no
rmal bank is controlled at VVEL angle of abnormal bank.
Engine speed will not rise more than 3,500 rpm due to the fuel cut.
VVEL actuator motor relay is turned off, an d VVEL value is become at a minimum angle.
Engine speed will not rise more than 3,500 rpm due to the fuel cut.
P1091 VVEL actuator motor rela
y VVEL actuator motor relay is turned off, an d VVEL value is become at a minimum angle.
Engine speed will not rise more than 3,500 rpm due to the fuel cut.
P1197 Out of gas  Engine torque is limited.
 VVEL value is maintained at a fixed angle.
P2101 Electric throttle control
function ECM stops the electric throttle control actuator control, throttle valve is maintained at a
fixed opening (approx. 5 degrees) by the return spring.
P2118 Throttle control motor ECM stops the electric throttle control actuator control, throttle valve is maintained at a
fixed opening (approx. 5 degrees) by the return spring.
P2119 Electric throttle control ac-
tuator
(When electric throttle control actuator does not function properly due to the return spring
malfunction:)
ECM controls the electric throttle actuator by regulating the throttle opening around the
idle position. The engine speed will not rise more than 2,000 rpm.
(When throttle valve opening angle in fail-safe mode is not in specified range:)
ECM controls the electric throttle control actuator because of regulating the throttle open-
ing to 20 degrees or less.
(When ECM detects the throttle valve is stuck open:)
While the vehicle is being driven, it slows down gradually by fuel cut. After the vehicle
stops, the engine stalls.
The engine can restart in the N or P position, and engine speed will not exceed 1,000 rpm
or more.
P1290
P2100
P2103 Throttle control motor relay ECM stops the electric throttle control actuator control, throttle valve is maintained at a
fixed opening (approx. 5 degrees) by the return spring.
P1606 VVEL control module VVEL
actuator motor relay is turned off, and VVEL value is become at a minimum angle.
Engine speed will not rise more than 3,500 rpm due to the fuel cut.
P1805 Brake switch ECM controls the electric throttle control
actuator by regulating the throttle opening to a
small range.
Therefore, acceleration will be poor.
Vehicle condition Driving condition
When engine is idling Normal
When accelerating Poor acceleration
DTC No. Detected items Engine operating condition in fail-safe mode
Revision: 2010 May2011 QX56