check engine INFINITI QX56 2011 Factory Service Manual

EC-140
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BASIC INSPECTION
2. Rev engine between 2,000 and 3,000 rpm 2 or 3 times under no
load, then run engine at idle speed for approximately 1 minute.
3. Check idle speed.
For procedure, refer to EC-530, "
Inspection".
For specification, refer to EC-538, "
Idle Speed".
Is the inspection result normal?
YES >> GO TO 10.
NO >> GO TO 4.
4.PERFORM ACCELERATOR PEDAL RE LEASED POSITION LEARNING
1. Stop engine.
2. Perform EC-146, "
Work Procedure".
>> GO TO 5.
5.PERFORM THROTTLE VALVE CL OSED POSITION LEARNING
Perform EC-147, "
Work Procedure".
>> GO TO 6.
6.PERFORM IDLE AIR VOLUME LEARNING
Perform EC-148, "
Work Procedure".
Is Idle Air Volume Learning carried out successfully?
YES >> GO TO 7.
NO >> Follow the instruction of Idle Air Volume Learning. Then GO TO 4.
7.CHECK IDLE SPEED AGAIN
1. Start engine and warm it up to normal operating temperature.
2. Check idle speed. For procedure, refer to EC-530, "
Inspection".
For specification, refer to EC-538, "
Idle Speed".
Is the inspection result normal?
YES >> GO TO 10.
NO >> GO TO 8.
8.DETECT MALFUNCTIONING PART
Check the Following.
 Check camshaft position sensor and circuit. Refer to EC-303, "
DTC Logic".
 Check crankshaft position sensor and circuit. Refer to EC-299, "
DTC Logic".
Is the inspection result normal?
YES >> GO TO 9.
NO >> Repair or replace malfunctioning part. Then GO TO 4.
9.CHECK ECM FUNCTION
1. Substitute with a non-malfunctioning ECM to check EC M function. (ECM may be the cause of the incident,
although this is rare.)
2. Perform initialization of IVIS (NATS) system and regist ration of all IVIS (NATS) ignition key IDs. Refer to
SEC-51, "
ECM : Work Procedure".
>> GO TO 4.
10.CHECK IGNITION TIMING
1. Run engine at idle.
2. Check ignition timing with a timing light. For procedure, refer to EC-531, "
Inspection".
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BASIC INSPECTIONEC-141
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For specification, refer to
EC-538, "Ignition Timing".
Is the inspection result normal?
YES >> GO TO 19.
NO >> GO TO 11.
11 .PERFORM ACCELERATOR PEDAL RELEASED POSITION LEARNING
1. Stop engine.
2. Perform EC-146, "
Work Procedure".
>> GO TO 12.
12.PERFORM THROTTLE VALVE CLOSED POSITION LEARNING
Perform EC-147, "
Work Procedure".
>> GO TO 13.
13.PERFORM IDLE AIR VOLUME LEARNING
Perform EC-148, "
Work Procedure".
Is Idle Air Volume Learning carried out successfully?
YES >> GO TO 14.
NO >> Follow the instruction of Idle Air Volume Learning. Then GO TO 4.
14.CHECK IDLE SPEED AGAIN
1. Start engine and warm it up to normal operating temperature.
2. Check idle speed. For procedure, refer to EC-530, "
Inspection".
For specification, refer to EC-538, "
Idle Speed".
Is the inspection result normal?
YES >> GO TO 15.
NO >> GO TO 17.
15.CHECK IGNITION TIMING AGAIN
1. Run engine at idle.
2. Check ignition timing with a timing light. For procedure, refer to EC-531, "
Inspection".
For specification, refer to EC-538, "
Ignition Timing".
Is the inspection result normal?
YES >> GO TO 19.
NO >> GO TO 16.
16.CHECK TIMING CHAIN INSTALLATION
Check timing chain installation. Refer to EM-62, "
Removal and Installation".
Is the inspection result normal?
YES >> GO TO 17.
NO >> Repair the timing chain installation. Then GO TO 4.
17.DETECT MALFUNCTIONING PART
Check the following.
 Check camshaft position sensor and circuit. Refer to EC-303, "
DTC Logic".
 Check crankshaft position sensor and circuit. Refer to EC-299, "
DTC Logic".
Is the inspection result normal?
YES >> GO TO 18.
NO >> Repair or replace malfunctioning part. Then GO TO 4.
18.CHECK ECM FUNCTION
1. Substitute with a non-malfunctioning ECM to check EC M function. (ECM may be the cause of the incident,
although this is rare.)
Revision: 2010 May2011 QX56

VIN REGISTRATIONEC-145
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VIN REGISTRATION
DescriptionINFOID:0000000006217744
VIN Registration is an operation to register VIN in
ECM. It must be performed each time ECM is replaced.
NOTE:
Accurate VIN which is registered in ECM may be required for Inspection & Maintenance (I/M).
Work ProcedureINFOID:0000000006217745
1.CHECK VIN
Check the VIN of the vehicle and note it. Refer to GI-23, "
Information About Identification or Model Code".
>> GO TO 2.
2.PERFORM VIN REGISTRATION
WITH CONSULT-III
1. Turn ignition switch ON with engine stopped.
2. Select “VIN REGISTRATION” in “WORK SUPPORT” mode.
3. Follow the instructions on the CONSULT-III display.
>> END
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THROTTLE VALVE CLOSED POSITION LEARNINGEC-147
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THROTTLE VALVE CLOSED
POSITION LEARNING
DescriptionINFOID:0000000006217748
Throttle Valve Closed Position Learning is a function of ECM to learn the fully closed position of the throttle
valve by monitoring the throttle position sensor output signal. It must be performed each time the harness con-
nector of the electric throttle control actuator or ECM is disconnected or elec tric throttle control actuator inside
is cleaned.
Work ProcedureINFOID:0000000006217749
1.START
WITH CONSULT-III
1. Turn ignition switch ON.
2. Select “CLSD THL POS LEARN” in “WORK SUPPORT” mode.
3. Follow the instructions on the CONSULT-III display.
4. Turn ignition switch OFF and wait at least 10 seconds.
Check that throttle valve moves during the above 10 seconds by confirming the operating sound.
WITHOUT CONSULT-III
1. Start the engine.
NOTE:
Engine coolant temperature is 25 °C (77 °F) or less before engine starts.
2. Warm up the engine. NOTE:
Raise engine coolant temperature until it reaches 65 °C (149 °F) or more.
3. Turn ignition switch OFF and wait at least 10 seconds. Check that throttle valve moves during the above 10 seconds by confirming the operating sound.
>> END
Revision: 2010 May2011 QX56

EC-148
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IDLE AIR VOLUME LEARNING
IDLE AIR VOLUME LEARNING
DescriptionINFOID:0000000006217750
Idle Air Volume Learning is a function of ECM to learn
the idle air volume that keeps engine idle speed within
the specific range. It must be perfo rmed under the following conditions:
 Each time the electric throttle control actuator or ECM is replaced.
 Idle speed or ignition timing is out of the specification.
Work ProcedureINFOID:0000000006217751
1.PRECONDITIONING
Check that all of the following conditions are satisfied.
Learning will be cancelled if any of the follo wing conditions are missed for even a moment.
 Battery voltage: More than 12.9 V (At idle)
 Engine coolant temperature: 70 - 105 °C (158 - 221 °F)
 Selector lever position: P or N
 Electric load switch: OFF
(Air conditioner, headlamp, rear window defogger)
On vehicles equipped with daytime light systems, if the parking brake is applied before the engine is
started the headlamp will not illuminate.
 Steering wheel: Neutral (Straight-ahead position)
 Vehicle speed: Stopped
 Transmission: Warmed-up
- With CONSULT-III: Drive vehicle until “ATF TEMP 2” in “DATA MONITOR” mode of “A/T” system indicates
less than 0.9 V.
- Without CONSULT-III: Drive vehicle for 10 minutes.
Will CONSULT-III be used?
YES >> GO TO 2.
NO >> GO TO 3.
2.PERFORM IDLE AIR VOLUME LEARNING
WITH CONSULT-III
1. Perform Accelerator Pedal Released Position Learning. Refer to EC-146, "
Work Procedure".
2. Perform Throttle Valve Closed Position Learning. EC-147, "
Work Procedure".
3. Start engine and warm it up to normal operating temperature.
4. Select “IDLE AIR VOL LEARN” in “WORK SUPPORT” mode.
5. Touch “START” and wait 20 seconds.
Is
“CMPLT” displayed on CONSULT-III screen?
YES >> GO TO 4.
NO >> GO TO 5.
3.PERFORM IDLE AIR VOLUME LEARNING
WITHOUT CONSULT-III
NOTE:
 It is better to count the ti me accurately with a clock.
 It is impossible to switch the di agnostic mode when an accelerator pedal position sensor circuit has
a malfunction.
1. Perform Accelerator Pedal Released Position Learning. Refer to EC-146, "
Work Procedure".
2. Perform Throttle Valve Closed Position Learning. EC-147, "
Work Procedure".
3. Start engine and warm it up to normal operating temperature.
4. Turn ignition switch OFF and wait at least 10 seconds.
5. Confirm that accelerator pedal is fully releas ed, turn ignition switch ON and wait 3 seconds.
6. Repeat the following procedure quickly 5 times within 5 seconds.
- Fully depress the accelerator pedal.
- Fully release the accelerator pedal.
7. Wait 7 seconds, fully depress the accelerator pedal for approx. 20 seconds until the MIL stops blinking
and turns ON.
8. Fully release the accelerator pedal within 3 seconds after the MIL turns ON.
Revision: 2010 May2011 QX56

IDLE AIR VOLUME LEARNINGEC-149
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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
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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
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EC-152
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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
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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
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At idling: Approximately 450 kPa (4.5 bar, 4.6 kg/cm2,
65 psi)
Revision: 2010 May2011 QX56