2011 INFINITI QX56 ignition

IDLE AIR VOLUME LEARNINGEC-149
< BASIC INSPECTION > [VK56VD]
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9. Start engine and let it idle.
10. Wait 20 seconds.
>> GO TO 4.
4.CHECK IDLE SPEED AND IGNITION TIMING
Rev up engine two or three times and check that idle speed and ignition timing are within the specifications.
For procedure, refer to EC-530, "
Inspection" and EC-531, "Inspection".
For specifications, refer to EC-538, "
Idle Speed" and EC-538, "Ignition Timing".
Is the inspection result normal?
YES >> INSPECTION END
NO >> GO TO 5.
5.DETECT MALFUNCTIONING PART-I
Check the following
 Check that throttle valve is fully closed.
 Check PCV valve operation.
 Check that downstream of throttle valve is free from air leakage.
Is the inspection result normal?
YES >> GO TO 6.
NO >> Repair or replace malfunctioning part.
6.DETECT MALFUNCTIONING PART-II
Engine component parts and their installation conditi on are questionable. Check and eliminate the cause of
the incident.
It is useful to perform “TROUBLE DIAG NOSIS - SPECIFICATION VALUE”. Refer to EC-161, "
Description".
If any of the following conditions occur after the engi ne has started, eliminate the cause of the incident and
perform Idle Air Volume Learning again:
 Engine stalls.
 Incorrect idle.
>> INSPECTION END
SEC897C
Revision: 2010 May2011 QX56

EC-150
< BASIC INSPECTION >[VK56VD]
VVEL CONTROL SHAFT POSI
TION SENSOR ADJUSTMENT
VVEL CONTROL SHAFT POSITI ON SENSOR ADJUSTMENT
DescriptionINFOID:0000000006217752
VVEL control shaft position sensor adjustment is an operat ion to adjust the initial position of the VVEL control
shaft position sensor.
It must be performed each time VVEL ladder assembly is replaced.
CAUTION:
 It must be performed only on the replaced bank side.
 It must not be performed except when VVEL la dder assembly is replaced. If by any chance the
adjustment is performed, replace VVEL ladder assembly.
Work ProcedureINFOID:0000000006217753
1.START
Will CONSULT-III be used?
Will CONSULT-III be used?
YES >> GO TO 2.
NO >> GO TO 3.
2.PERFORM VVEL CONTROL SHAFT POSITION SENSOR ADJUSTMENT
WITH CONSULT-III
1. Turn ignition switch ON.
2. Select “VVEL POS SEN ADJ PREP” in “WORK SUPPORT” mode with CONSULT-III.
3. Touch “Start” and wait a few seconds.
4. Check that “CMPLT” is displayed on CONSULT-III screen.
5. Select “VVEL POSITION SEN-B1” or “VVEL POSI TION SEN-B2” in “DATA MONITOR” mode with CON-
SULT-III.
6. Loosen the VVEL control shaft position sensor mounting bolts
(1).
7. Turn the VVEL control shaft position sensor (2) clockwise and counterclockwise while monitoring the output voltage of “VVEL
POSITION SEN-B1” or “VVEL POSITION SEN-B2” and adjust
the output voltage to be within the standard value.
8. Tighten the VVEL control shaft position sensor mounting bolts.
9. Reconfirm that the output voltage of “VVEL POSITI ON SEN-B1” or “VVEL POSITION SEN-B2” is within
the standard value.
NOTE:
If it varies from the standard value after the m ounting bolts are tightened, perform steps 6 to 8 again.
10. Turn ignition switch OFF and wait at least 10 seconds.
11. Start engine and warm it up to normal operating temperature.
12. Turn ignition switch OFF and wait at least 10 seconds.
13. Perform idle air volume learning. Refer to EC-148, "
Work Procedure".
>> INSPECTION END
3.PERFORM VVEL CONTROL SHAFT POSITION SENSOR ADJUSTMENT
WITHOUT CONSULT-III
1. Disconnect VVEL control shaft position sensor harness connector.
2. Remove VVEL actuator motor relay.
3. Turn ignition switch ON, wait at least 5 seconds and then turn it OFF. Voltage: 500
± 48 mV
: 7.0 Nm (0.71 kg-m, 62 in-lb)
Voltage: 500 ± 48 mV
JSBIA0533ZZ
Revision: 2010 May2011 QX56

VVEL CONTROL SHAFT POSITION SENSOR ADJUSTMENT
EC-151
< BASIC INSPECTION > [VK56VD]
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4. Reconnect all harness connectors disconnected.
5. Install VVEL actuator motor relay.
6. Turn ignition switch ON and wait at least 5 seconds.
7. Loosen the VVEL control shaft position sensor mounting bolts
(1).
8. Turn the VVEL control shaft position sensor (2) clockwise and
counterclockwise while monitoring the output voltage between
the VVEL control module terminals with a tester and adjust the
output voltage to be within the standard value.
9. Tighten the VVEL control shaft position sensor mounting bolts.
10. Reconfirm that the output voltage of VVEL contro l shaft position sensor is within the standard value.
NOTE:
If it varies from the standard value after the m ounting bolts are tightened, perform steps 7 to 9 again.
11. Turn ignition switch OFF and wait at least 10 seconds.
12. Start engine and warm it up to normal operating temperature.
13. Turn ignition switch OFF and wait at least 10 seconds.
14. Perform Idle Air Volume Learning. Refer to EC-148, "
Work Procedure".
>> INSPECTION END
JSBIA0533ZZ
VVEL control module Voltage
Bank Connector +–
Terminal Terminal
1 F56 36
500 ± 48 mV
254
: 7.0 Nm (0.71 kg-m, 62 in-lb)
VVEL control module
Voltage
Bank Connector +–
Terminal Terminal
1 F56 3 6
500 ± 48 mV
254
Revision: 2010 May2011 QX56

EC-152
< BASIC INSPECTION >[VK56VD]
MIXTURE RATIO SELF-LEARNING VALUE CLEAR
MIXTURE RATIO SELF-LEARNING VALUE CLEAR
DescriptionINFOID:0000000006217754
This describes how to erase the mixture ratio self-learni
ng value. For the actual procedure, follow the instruc-
tions in “Diagnosis Procedure”.
Work ProcedureINFOID:0000000006217755
1.START
WITH CONSULT-III
1. Start engine and warm it up to normal operating temperature.
2. Select “SELF-LEARNING CONT” in “WORK SUPPORT” mode with CONSULT-III.
3. Clear mixture ratio self-learning value by touching “CLEAR”.
WITH GST
1. Start engine and warm it up to normal operating temperature.
2. Turn ignition switch OFF.
3. Disconnect mass air flow sensor harness connector.
4. Restart engine and let it idle for at least 5 seconds.
5. Stop engine and reconnect mass air flow sensor harness connector.
6. Select Service $03 with GST. Check DTC P0102 is detected.
7. Select Service $04 with GST to erase the DTC P0102.
>> END
Revision: 2010 May2011 QX56

FUEL PRESSUREEC-153
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FUEL PRESSURE
Work ProcedureINFOID:0000000006217756
FUEL PRESSURE RELEASE
WITH CONSULT-III
1. Turn ignition switch ON.
2. Perform “FUEL PRESSURE RELEASE” in
“WORK SUPPORT” mode with CONSULT-III.
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-III
1. Remove fuel pump fuse in IPDM E/R. NOTE:
 For the fuse number, refer to EC-114, "
Wiring Diagram".
 For the fuse arrangement, refer to PG-143, "
Fuse, Connector and Terminal Arrangement".
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.
LOW FUEL PRESSURE CHECK
CAUTION:
 Before disconnecting fuel line, release fuel pressure from fuel line to eliminate danger.
 The fuel hose connection method used when taking fuel pressure check must not be used for other
purposes.
 Do not perform fuel pressure check with electrical syst ems operating (i.e. lights, rear defogger, A/C,
etc.) Fuel pressure gauge may indicate false readin gs due to varying engine load and changes in
manifold vacuum.
NOTE:
Prepare pans or saucers under the disconnected fuel line because the fuel may spill out.
1. Release fuel pressure to zero.
2. Prepare fuel hose for fuel pressure check (B) and fuel tube adapter [SST (KV10118400)] (D), then connect fuel pressure
gauge (A).
CAUTION:
 Use suitable fuel hose for fuel pressure check (genuine
NISSAN fuel hose without quick connector).
 To avoid unnecessary force or tension to hose, use mod-
erately long fuel hose for fuel pressure check.
 Do not use the fuel hose for checking fuel pressure with damage or cracks on it.
 Use Pressure Gauge to check fuel pressure.
3. Disconnect fuel feed hose from fuel tube. Refer to EM-43, "
Exploded View".
CAUTION:
Do not twist or kink fuel hose because it is plastic hose.
To quick connector
To fuel tube (engine side)
C : Hose clamp
PBIB2982E
Revision: 2010 May2011 QX56

EC-154
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FUEL PRESSURE
4. Connect fuel hose for fuel pressure check (1) to fuel tube
(engine side) with clamp (2) as shown in the figure.
CAUTION:
 Wipe off oil or dirt from hose insertion part using clothmoistened with gasoline.
 Apply proper amount of gasoli ne between top of the fuel
tube (3) and No.1 spool (4).
 Insert fuel hose for fuel pressure check until it touches the No.1 spool on fuel tube.
 Use NISSAN genuine hose clamp (part number: 16439
N4710 or 16439 40U00).
 When reconnecting fuel line, always use new clamps.
 Use a torque driver to tighten clamps.
 Install hose clamp to the position within 1 - 2 mm (0.04 - 0.08 in).
 Make sure that clamp screw does not contact adjacent parts.
5. Connect fuel tube adapter (C) to fuel feed hose (1) in the same manner as instructed in Step 4.
6. After connecting fuel hose for fuel pressure check, pull the hose with a force of approximately 98 N (10 kg,
22 lb) to confirm fuel tube does not come off.
7. Reinstall the part removed at Step 3. NOTE:
Install the part to allow smooth engine starts.
8. Turn ignition switch ON and check for fuel leakage.
9. Start engine and check for fuel leakage.
10. Read the indication of fuel pressure gauge. CAUTION:
 Do not perform fuel pressure check with system operating. Fuel pressure gauge may indicate
false readings.
 During fuel pressure check, confirm for fuel leakage from fuel connection every 3 minutes.
HIGH FUEL PRESSURE CHECK
NOTE:
Since the fuel pressure gauge kit cannot be connected, follow the method shown below to check high fuel
pressure.
WITH CONSULT-III
1. Start engine.
2. Check “FUEL PRES SEN V” in “DATA MONITOR” mode with CONSULT-III.
5 : No.2 spool
Tightening torque : 1.0 - 1.5 N·m (0.1 - 0.15 kg-m, 9 - 13 in-
lb)
A : Fuel pressure gauge
B : Fuel hose for fuel pressure check
PBIB2983E
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At idling: Approximately 450 kPa (4.5 bar, 4.6 kg/cm2,
65 psi)
Revision: 2010 May2011 QX56

EC-160
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HOW TO SET SRT CODE
6.PATTERN 2
1. Drive the vehicle. And depress the accelerator pedal until vehicle speed is 90 km/h (56 MPH), then
release the accelerator pedal and keep it released for more than 10 seconds.
2. Depress the accelerator pedal until vehicle speed is 90 km/h (56 MPH) again
NOTE:
 Checking the vehicle speed with GST is advised.
 When steady-state driving is performed again even afte r it is interrupted, each diagnosis can be conducted.
In this case, the time required for diagnosis may be extended.
>> GO TO 7.
7.PATTERN 3
 Operate vehicle following the driving pattern shown in the figure.
 Release the accelerator pedal during deceleration of vehicle speed from 90 km/h (56 MPH) to 0 km/h (0 MPH).
>> GO TO 8.
8.PATTERN 4
 The accelerator pedal must be held very steady during steady-state driving.
 If the accelerator pedal is moved, the test must be conducted again.
>> GO TO 9.
9.PATTERN 5
 Cool down the engine so that the engine coolant temperature lowers between 15 - 35 °C (59 - 95 °F).
CAUTION:
Never turn the ignition switch ON while cooling down the engine.
 Engine coolant temperature at engine start is between 15 – 35 °C (59 – 95 °F) and has lowered 45 °C (113 °F)
or more since the latest engine stop.
>> GO TO 10.
10.CHECK SRT STATUS
WITH CONSULT-III
Select “SRT STATUS” in “DTC & SRT CONFIRMATION” mode with CONSULT-III.
WITHOUT CONSULT-III
Perform “SRT status” mode with EC-60, "
On Board Diagnosis Function".
WITH GST
Select Service $01 with GST.
Is SRT(s) set?
YES >> END
NO >> Call TECH LINE or take appropriate action.
PBIB2244E
Revision: 2010 May2011 QX56

EC-164
< DTC/CIRCUIT DIAGNOSIS >[VK56VD]
TROUBLE DIAGNOSIS - SPECIFICATION VALUE
NOTE:
Check “A/F ALPHA-B1” and “A/F ALPHA-B2” for approxim
ately 1 minute because they may fluctuate. It is
NG if the indication is out of the SP value even a little.
Is the measurement value within the SP value?
YES >> GO TO 14.
NO-1 >> Less than the SP value: GO TO 2.
NO-2 >> More than the SP value: GO TO 3.
2.CHECK “B/FUEL SCHDL”
Select “B/FUEL SCHDL” in “SPEC” of “DATA MONITOR” mode, and check that the indication is within the SP
value.
Is the measurement value within the SP value?
YES >> GO TO 4.
NO >> More than the SP value: GO TO 16.
3.CHECK “B/FUEL SCHDL”
Select “B/FUEL SCHDL” in “SPEC” of “DATA MONITOR” mode, and check that the indication is within the SP
value.
Is the measurement value within the SP value?
YES >> GO TO 6.
NO-1 >> More than the SP value: GO TO 6.
NO-2 >> Less than the SP value: GO TO 22.
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” and “A/F ALPHA-B2” in “ SPEC” of “DATA MONITOR” mode, and check that each
indication is within the SP value.
Is the measurement value within the SP value?
YES >> GO TO 5.
NO >> 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 gasoline 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 detec ted after changing engine oil or changing driving con-
ditions.
>> INSPECTION END
6.PERFORM POWER BALANCE TEST
1. Perform “POWER BALANCE” in “ACTIVE TEST” mode.
2. Check that each cylinder produces a momentary engine speed drop.
Is the inspection result normal?
YES >> GO TO 9.
NO >> GO TO 7.
7.DETECT MALFUNCTIONING PART
Check the following below.
 Ignition coil and its circuit (Refer to EC-506, "
Component Function Check".)
 Fuel injector and its circuit (Refer to EC-498, "
Component Function Check".)
 Intake air leakage
 Low compression pressure (Refer to EM-16, "
Inspection".)
Is the inspection result normal?
Revision: 2010 May2011 QX56