2010 INFINITI QX56 upper

EC-378
< COMPONENT DIAGNOSIS >[VK56DE]
P2138 APP SENSOR
P2138 APP SENSOR
Component DescriptionINFOID:0000000005149455
The accelerator pedal position sensor is installed on the upper end
of the accelerator pedal assembly. The sensor detects the accelera-
tor position and sends a signal to the ECM.
Accelerator pedal position sensor has two sensors. These sensors
are a kind of potentiometers which transform the accelerator pedal
position into output voltage, and emit the voltage signal to the ECM.
In addition, these sensors detect the opening and closing speed of
the accelerator pedal and feed the voltage signals to the ECM. The
ECM judges the current opening angle of the accelerator pedal from
these signals and controls the throttle control motor based on these
signals.
Idle position of the accelerator pedal is determined by the ECM
receiving the signal from the accelerator pedal position sensor. The ECM uses this signal for the engine oper-
ation such as fuel cut.
On Board Diagn
osis LogicINFOID:0000000005149456
This self-diagnosis has the one trip detection logic.
NOTE:
If DTC P2138 is displayed with DTC P0643, first pe rform the trouble diagnosis for DTC P0643. Refer to
EC-289
.
FA I L - S A F E M O D E
When the malfunction is detected, ECM enters fail-safe mode and the MIL lights up.
DTC Confirmation ProcedureINFOID:0000000005149457
NOTE:
If DTC Confirmation Procedure has been previously conducted, always perform the following procedure
before conducting the next step.
1. Turn ignition switch OFF and wait at least 10 seconds.
2. Turn ignition switch ON.
3. Turn ignition switch OFF and wait at least 10 seconds.
TESTING CONDITION:
Before performing the following procedure, confirm that battery voltage is more than 8 V at idle.
1. Start engine and let it idle for 1 second.
2. Check DTC.
3. If DTC is detected, go to EC-379, "
Diagnosis Procedure".
PBIB1741E
DTC No. Trouble diagnosis name DTC detecting condition Possible cause
P2138
2138 Accelerator pedal position
sensor circuit range/per-
formance Rationally incorrect voltage is sent to ECM
compared with the sign
als from APP sensor 1
and APP sensor 2. • Harness or connector
(APP sensor 1 and 2 circuit is open or
shorted.)
(TP sensor circuit is shorted.)
• Accelerator pedal position sensor 1 and 2
• Electric throttle control actuator
(TP sensor)
Engine operating condition in fail-safe mode
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.
So, the acceleration will be poor.
Revision: April 20092010 QX56

AIR CLEANER FILTEREM-15
< ON-VEHICLE MAINTENANCE >
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AIR CLEANER FILTER
Exploded ViewINFOID:0000000005148978
Removal and Installation (Viscous paper type)INFOID:0000000005148979
REMOVAL
NOTE:
• The viscous paper type filter does not
need cleaning between replacement intervals.
• Replace the air filter as necessary for periodic maintenance. Refer to MA-9, "
Introduction of Periodic Mainte-
nance".
1. Remove the air cleaner case (upper).
2. Remove the air cleaner filter from the air cleaner case (lower).
INSTALLATION
1. Install the new air cleaner filter in the air cleaner case (lower).
2. Install the air cleaner case (upper).
1. Air cleaner case (lower) 2. Air cleaner filter3. Air cleaner case (upper)
4. Air duct and resonator assembly Front
ALBIA0413GB
Revision: April 20092010 QX56

AIR CLEANER AND AIR DUCTEM-25
< ON-VEHICLE REPAIR >
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AIR CLEANER AND AIR DUCT
Exploded ViewINFOID:0000000005148985
Removal and InstallationINFOID:0000000005148986
REMOVAL
1. Remove the engine room cover using power tool. Refer to
EM-24, "Removal and Installation".
2. Disconnect the harness connector from air cleaner case (upper).
3. Remove the air duct and resonator assembly and air cleaner case.
4. Remove air cleaner filter and air cleaner case (lower)
• Add marks as necessary for easier installation.
INSTALLATION
Installation is in the reverse order of removal.
1. Air cleaner case (lower) 2. Air cleaner filter 3. Air cleaner case (upper)
4. Air duct and resonator assembly Front
ALBIA0413GB
Revision: April 20092010 QX56

OIL PAN AND OIL STRAINEREM-33
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OIL PAN AND OIL STRAINER
Exploded ViewINFOID:0000000005148991
Removal and InstallationINFOID:0000000005148992
REMOVAL
WARNING:
To avoid the danger of being scalded, never drain the engine oil when the engine is hot.
1. Drain engine oil. Refer to
LU-9, "
Changing Engine Oil".
2. Remove the engine. Refer to EM-78, "
Removal and Installation".
3. Remove the oil pan (lower) using the following steps.
1. Oil pan (upper) 2. O-ring3. O-ring
4. O-ring 5. O-ring (with collar)6. Oil level gauge guide
7. Oil level gauge 8. O-ring9. Connector bolt
10. Oil filter 11. Oil cooler12. Relief valve
13. Oil pressure switch 14. Gasket15. Drain plug
16. Oil pan (lower) 17. Oil strainer
KBIA2465E
Revision: April 20092010 QX56

EM-34
< ON-VEHICLE REPAIR >
OIL PAN AND OIL STRAINER
a. Remove the oil pan (lower) bolts in the reverse order as shownusing power tool.
• : Engine front
b. Insert Tool between the lower oil pan and the upper oil pan. CAUTION:
• Be careful not to damage the mating surface.
• Do not insert a screwdriver, this will damage the matingsurfaces.
c. Slide (2) the Tool by tapping (1) its side with a hammer to remove the lower oil pan from the upper oil pan.
4. Remove the oil strainer from the oil pan (upper).
5. Remove the oil cooler, if necessary. Refer to LU-12, "
Removal and Installation".
6. Remove the oil pan (upper) using the following steps.
a. Remove the oil pan (upper) bolts in the reverse order as shown. • : Engine front
b. Remove the oil pan (upper) from the cylinder block by prying it at the points shown, using suitable tool.
CAUTION:
Do not damage mating surface.
AWBIA0832ZZ
Tool number : KV10111100 (J-37228)
WBIA0566E
AWBIA0833ZZ
KBIA2468E
Revision: April 20092010 QX56

OIL PAN AND OIL STRAINEREM-35
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7. Remove the O-rings from the oil pump and front cover.
NOTE:
Do not reuse O-rings.
INSPECTION AFTER REMOVAL
Clean the oil strainer.
INSTALLATION
1. Install the oil pan (upper) using the following steps.
a. Apply liquid gasket thoroughly as shown.Use Genuine RTV Silicone Sealant or equivalent. Refer to GI-
15, "Recommended Chemical Products and Sealants".
CAUTION:
Apply liquid gasket to outside of bolt hole for the hole
shown by .
b. Install new O-rings to the oil pump and front cover side.
c. Tighten the bolts in numerical order as shown.
2. Install the oil strainer to the oil pan (upper).
KBIA2469E
KBIA2470E
KBIA2469E
M6 × 30 mm (1.18 in) : No. 16, 17
M8 × 25 mm (0.98in) : No. 1, 3, 5, 7, 9, 13, 15
M8 × 45 mm (1.77 in) : No. 2, 4, 6, 8, 10, 14
M8 × 123 mm (4.84in) : No. 11, 12
PBIC2553E
Revision: April 20092010 QX56

EM-38
< ON-VEHICLE REPAIR >
ROCKER COVER
ROCKER COVER
Exploded ViewINFOID:0000000005148995
Removal and InstallationINFOID:0000000005148996
REMOVAL
1. Remove the engine room cover using power tool. Refer to EM-24, "Removal and Installation".
2. Move the harness on the upper rocker cover and its peripheral aside.
3. Remove the ignition coils. Refer to EM-37, "
Removal and Installation".
4. Remove the PCV hose from the PCV control valves.
5. Loosen the bolts in reverse order shown using power tool for rocker cover (A) or (B).
• : Engine front
CAUTION:
Do not hold the rocker cover ( RH) (B) by the oil filler neck.
INSTALLATION
1. Rocker cover (LH) 2. PCV control valve3. O-ring
4. Rocker cover gasket (LH) 5. Rocker cover (RH)6. PCV control valve
7. O-ring 8. Oil filler cap9. Rocker cover gasket (RH)
KBIA2508E
WBIA0697E
Revision: April 20092010 QX56

FUEL INJECTOR AND FUEL TUBEEM-41
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9. Remove fuel injector from fuel tube.
a. Spread open to remove clip.
b. Remove fuel injector from the
fuel tube by pulling straight out.
CAUTION:
• Be careful with remaining fuel that may leak out from fuel
tube.
• Do not damage injector nozzles during removal.
• Do not bump or drop fuel injectors.
• Do not disassemble fuel injectors.
10. Remove fuel damper from each fuel tube.
INSTALLATION
1. Install fuel damper to each fuel tube.
a. Apply engine oil to O-ring and set it into the cap of fuel tube. CAUTION:
• Handle O-ring with bare hands. Never wear gloves.
• Lubricate O-ring with new engine oil.
• Do not clean O-ring with solvent.
• Make sure that O-ring and its mating part are free of for- eign material.
• When installing O-ring, be car eful not to scratch it with
tool or fingernails. Also be careful not to twist or stretch
O-ring.
b. Make sure that backup spacer is in the O-ring connecting sur- face of fuel damper.
NOTE:
Backup spacer is fuel damper assembly part.
c. Insert fuel damper until it seats on fuel tube. CAUTION:
• Insert straight, making sure that the axis is lined up.
• Do not pressure-fit with excessive force.
d. Install cap, and then tighten bolts evenly by turns. • After tightening bolts, make sure that there is no gap between cap and fuel tube.
2. Install O-rings to fuel injector paying attention to the items below. CAUTION:
• Upper and lower O-ring are different.
• Handle O-ring with bare hands. Never wear gloves.
KBIA2506E
Reference value :130 N (13.3 kg, 29.2 lb)
Fuel tube side : Blue
Nozzle side : Brown
KBIA2473E
Revision: April 20092010 QX56