2011 INFINITI QX56 Camshaft position sensor

EC-480
< DTC/CIRCUIT DIAGNOSIS >[VK56VD]
P2138 APP SENSOR
Is the inspection result normal?
YES >> GO TO 7.
NO >> Repair short to ground or short to power in harness or connectors.
7.CHECK COMPONENTS
Check the following.
 Crankshaft position sensor (Refer to EC-301, "
Component Inspection (Crankshaft Position Sensor)".)
 Camshaft position sensor (bank 1) (Refer to EC-306, "
Component Inspection (Camshaft Position Sensor)".)
 Refrigerant pressure sensor (Refer to EC-520, "
Component Function Check".)
 EVAP control system pressure sensor (Refer to EC-335, "
Component Inspection (EVAP Control System
Pressure Sensor)".)
Is the inspection result normal?
YES >> GO TO 14.
NO >> Replace malfunctioning component.
8.CHECK APP SENSOR GROUND CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch OFF.
2. Disconnect ECM harness connector.
3. Check the continuity between APP sens or harness connector and ECM harness connector.
4. Also check harness for short to ground and short to power.
Is the inspection result normal?
YES >> GO TO 10.
NO >> GO TO 9.
9.DETECT MALFUNCTIONING PART
Check the following.
 Harness for open or short between ECM and accelerator pedal position sensor
 Loose or poor connection for each connector and harness
>> Repair open circuit, short to ground or short to power in harness or connectors.
10.CHECK APP SENSOR INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Check the continuity between APP sens or harness connector and ECM harness connector.
E80133Battery current sensor E63 2
Refrigerant pressure sensor E77 1
EVAP control system pressure sen-
sor
C17 3
131 APP sensor (Without ICC) E110 1
APP sensor (with ICC) E67 9
ECM Sensor
Connector Terminal Name Connector Terminal
APP sensor ECM Continuity
Connector Terminal Connector Terminal
E110
(Without ICC) 4
E80 140
Existed
5129
E67
(With ICC) 11
E80 140
Existed
8129
Revision: 2010 May2011 QX56

ENGINE CONTROL SYSTEM SYMPTOMSEC-525
< SYMPTOM DIAGNOSIS > [VK56VD]
C
D
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G H
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M A
EC
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Mass air flow sensor circuit
1
12 2
222 2 EC-201
Engine coolant temperature sensor circuit
333
EC-217
Air fuel ratio (A/F) sensor 1 circuit EC-181
EC-228
EC-232
EC-235
EC-238
Throttle position sensor circuit
22EC-219
EC-288
EC-406
EC-407
EC-475
Accelerator pedal position sensor circuit 3 2 1
EC-468EC-471
EC-478
Knock sensor circuit 2 3
EC-297
Engine oil temperature sensor 4 2 3EC-285
Crankshaft position sensor circuit 2 2EC-299
Camshaft position sensor circuit 3 2EC-303
Vehicle speed signal circuit 2 3 3 3EC-356
Power steering pressure sensor circuit 2 3 3EC-371
ECM 22333333333EC-376EC-378
EC-380
Intake valve timing control solenoid valve cir-
cuit
32 13223 3
EC-193
VVEL control module 3 4 4 3 EC-451EC-452
VVEL actuator motor 3 4 4 3
EC-390
VVEL actuator motor relay 3 4 4 3EC-393
VVEL control shaft position sensor 3 4 4 3EC-387
PNP signal circuit 3 3 3 3 3EC-383
Refrigerant pressure sensor circuit 2 3 3 4EC-520
Electrical load signal circuit 3EC-493
Air conditioner circuit 223333333 3 2HAC-60
ABS actuator and electric unit (control unit) 4BRC-60
SYMPTOM
Reference
page
HARD/NO START/RESTART (EXCP. HA)
ENGINE STALL
HESITATION/SURGING/FLAT SPOT
SPARK KNOCK/DETONATION
LACK OF POWER/POOR ACCELERATION
HIGH IDLE/LOW IDLE
ROUGH IDLE/HUNTING
IDLING VIBRATION
SLOW/NO RETURN TO IDLE
OVERHEATS/WATER TEMPERATURE HIGH
EXCESSIVE FUEL CONSUMPTION
EXCESSIVE OIL CONSUMPTION
BATTERY DEAD (UNDER CHARGE)
Warranty symptom code AA AB AC AD AE AF AG AH AJ AK AL AM HA
Revision: 2010 May2011 QX56

EM-36
< REMOVAL AND INSTALLATION >
VVEL ACTUATOR ASSEMBLY
VVEL ACTUATOR ASSEMBLY
Exploded ViewINFOID:0000000006289547
Removal and InstallationINFOID:0000000006289548
REMOVAL
1. Remove engine cover. Refer to EM-25, "Exploded View".
1.VVEL actuator motor assembly
(bank 2) 2. Gasket 3.
VVEL actuator ho
using assembly
(bank 2)
4. Washer 5. VVEL ladder as sembly (bank 2) 6. Exhaust camshaft (bank 2)
7. Cylinder head (bank 2) 8. Cylinder head (bank 1) 9. Exhaust camshaft (bank 1)
10. VVEL ladder assembly (bank 1) 11. VVEL actuator housing assembly
(bank 1)12. Gasket
13. VVEL actuator motor assembly
(bank 1) 14.
VVEL control shaft
position sensor
(bank 1) 15.
VVEL control shaft
position sensor
(bank 2)
A. Comply with the installation proce-
dure when tightening. Refer to
EM-
75, "Removal and Installation".B. View B C. View C
Refer to GI-4, "
Components" for symbols in the figure.
JSBIA0403GB
Revision: 2010 May2011 QX56

EM-62
< REMOVAL AND INSTALLATION >
TIMING CHAIN
Removal and Installation
INFOID:0000000006289566
REMOVAL
1. Release fuel pressure. Refer to EC-153, "Work Procedure".
2. Drain engine coolant from radiator. Refer to CO-8, "
Draining".
3. Remove fan shroud (lower). Refer to CO-13, "
Exploded View".
4. Remove fan bracket. Refer to CO-16, "
Exploded View".
5. Remove drive belt auto-tensioner. Refer to EM-26, "
Exploded View".
6. Remove oil level gauge and oil level gauge guide. Refer to EM-57, "
Exploded View".
7. Move power steering oil pump to the posit ion without the hindrance for work. Refer to ST-48, "
Exploded
View".
8. Remove alternator, alternator bracket and alternator stay. Refer to CHG-25, "
Exploded View".
9. Move power steering reservoir tank to the position without the hindrance for work, and then remove Res- ervoir tank bracket. Refer to ST-54, "
Exploded View".
10. Remove camshaft position sensors.
CAUTION:
 Handle carefully to avoid dropping and shocks.
 Never disassemble.
 Never allow metal powder to adhere to magnetic part atsensor tip.
 Never place sensors in a lo cation where they are exposed
to magnetism.
11. Remove high pressure fuel pump and lifter. Refer to EM-43, "
Exploded View".
CAUTION:
After removing lifter, replace lifter with a new one.
12. Remove radiator hose (upper) and radiator hose (lower). Refer to CO-13, "
Exploded View".
13. Remove water suction pipe. Refer to CO-20, "
Exploded View".
14. Remove valve timing control cover as per the following:
a. Disconnect valve timing control solenoid valve harness connector.
10. Slack guide (bank 2) 11. Timing chain tensioner (bank 2) 12. Exhaust camshaft sprocket (bank 1)
13. Timing chain (bank 1) 14. Intake camshaft sprocket (bank 1) 15. Timing chain tensioner (bank 1)
16. Slack guide (bank 1) 17. Tension guide (bank 1) 18. Oil pump
19. Camshaft position sensor (bank 2) 20. O-ring 21. Seal ring
22. Valve timing control cover (bank 2) 23. Intake valve timing control solenoid
valve (bank 2)24. Crankshaft pulley
25. Front oil seal 26. Intake valve timing control solenoid
valve (bank 1)27. Valve timing control cover (bank 1)
28. Timing chain tensioner cover 29. Front cover 30. O-ring
31. Camshaft position sensor (bank 1) 32. Camshaft bracket 33. Oil filter (for valve timing control so-
lenoid valve)
34. Crankshaft sprocket 35. Oil pump drive spacer
A. Comply with the installation proce-
dure when tightening. Refer to
EM-
62, "Removal and Installation".
Refer to GI-4, "
Components" for symbol marks in the figure.
A : Keep free from magnetic materials
JPBIA0454ZZ
Revision: 2010 May2011 QX56

EM-72
< REMOVAL AND INSTALLATION >
TIMING CHAIN
d. Being careful not to move seal ring from the installation groove,align dowel pins on front cover with dowel pin holes (C) to install
valve timing control covers.
e. Tighten mounting bolts in numerical order as shown in the fig- ure.
14. Install camshaft position sensor and valve timing c ontrol solenoid valve (RH and LH) to valve timing con-
trol cover, if removed.
 Be sure to tighten mounting bolts with flanges completely seated.
15. Install oil pan (upper). Refer to EM-57, "
Exploded View".
16. Install oil pan (lower) and oil strainer. Refer to EM-54, "
Exploded View".
17. Install water pump pulley. Refer to CO-18, "
Exploded View".
18. Install crankshaft pulley.  Fix the crankshaft as instructed in the removal procedure. Refer to EM-96, "
FRONT OIL SEAL :
Removal and Installation".
a. Install crankshaft pulley, taking care not to damage front oil seal.
b. Apply engine oil onto threaded parts of crankshaft pulley bolt and seating area.  Lightly tapping its center with plastic hammer, insert crankshaft pulley.
CAUTION:
Never tap crankshaft pulley on the side surface wh ere belt is installed (outer circumference).
c. Tighten crankshaft pulley bolt.
d. Put a paint mark (A) on crankshaft pulley (1) aligning with angle mark (B) on crankshaft pulley bolt.
e. Tighten crankshaft pulley bolt (clockwise).
 Check the tightening angle by referencing to the notches. Theangle between two notches is 90 degrees.
19. Rotate crankshaft pulley in normal direction (clockwise when viewed from engine front) to confirm it turns smoothly.
20. Install in the reverse order of removal.
InspectionINFOID:0000000006289567
INSPECTION AFTER DISASSEMBLY
Timing Chain
A: Bank 2
B: Bank 1
JPBIA3476ZZ
: 205 N·m (21 kg-m, 151 ft-lb)
Angle tightening: 90 degrees (c)
JPBIA2066ZZ
Revision: 2010 May2011 QX56

EM-74
< REMOVAL AND INSTALLATION >
CAMSHAFT
CAMSHAFT
Exploded ViewINFOID:0000000006289568
1.VVEL actuator motor assembly
(bank 2) 2. Gasket 3.
VVEL actuator ho
using assembly
(bank 2)
4. Washer 5. VVEL ladder as sembly (bank 2) 6. Exhaust camshaft (bank 2)
7. Cylinder head (bank 2) 8. Cylinder head (bank 1) 9. Exhaust camshaft (bank 1)
10. VVEL ladder assembly (bank 1) 11. VVEL actuator housing assembly
(bank 1)12. Gasket
13. VVEL actuator motor assembly
(bank 1) 14.
VVEL control shaft
position sensor
(bank 1) 15.
VVEL control shaft
position sensor
(bank 2)
A. Comply with the installation proce-
dure when tightening. Refer to
EM-
75, "Removal and Installation".B. View B C. View C
Refer to GI-4, "
Components" for symbols in the figure.
JSBIA0403GB
Revision: 2010 May2011 QX56

CAMSHAFTEM-75
< REMOVAL AND INSTALLATION >
C
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EM
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Removal and InstallationINFOID:0000000006289569
REMOVAL
CAUTION:
 Never loosen adjusting bolts (A), mounting bolt
s (black color) (B) of VVEL ladder assembly and
mounting bolts (C) of VVEL control shaft position sen sor. If loosened, the stroke of cam lift becomes
out of adjustment. In such case, replacement of VVEL ladder assembly and cylinder head assembly
is required.
 Never loosen the mounting bolts (C) of the VVEL control shaft position sensor. VVEL control shaft
position sensor mounting bolts are required to be loosened for adjustment only when using a new
VVEL ladder assembly. Refer to EC-150, "
Work Procedure".
NOTE:
VVEL ladder assembly cannot be replaced as a singl e part, because it is machined together with cylinder
head assembly.
1. Remove VVEL actuator motor assembly. Refer to EM-36, "
Exploded View".
2. Remove rocker covers (bank 1 and bank 2). Refer to EM-33, "
Exploded View".
3. Remove VVEL actuator housing assembly. Refer to EM-36, "
Exploded View".
4. Remove front cover, camshaft sprockets, and timing chains. Refer to EM-61, "
Exploded View".
5. Remove VVEL ladder assembly.
JPBIA3512ZZ
VVEL control shaft positi on sensor mounting bolt
: 7.0 N·m (0.71 kg-m, 62 in-lb)
Revision: 2010 May2011 QX56

CAMSHAFTEM-77
< REMOVAL AND INSTALLATION >
C
DE
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M A
EM
NP
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a. Apply a continuous bead of liquid gasket with tube presser
(commercial service tool) to the VVEL ladder assembly as
shown in the figure.
Use Genuine RTV silicone seal ant or equivalent. Refer to
GI-22, "
Recommended Chemical Products and Sealants".
b. Tighten mounting bolts in the following step, in numerical order as shown.
i. Tighten bolts in numerical order as shown.
ii. Tighten bolts in numerical order as shown.
iii. Tighten bolts in numerical order as shown.
4. Install camshaft sprockets and timing chains. Refer to EM-61, "
Exploded View".
5. Install VVEL actuator housing assembly. Refer to EM-36, "
Removal and Installation".
6. Inspect the valve clearance. Refer to EM-12, "
Inspection".
7. Install in the reverse order of removal.
8. When New VVEL ladar assembly used. Adjust VVEL control shaft position sensor. Refer to EC-150,
"Work Procedure".
InspectionINFOID:0000000006289570
EXHAUST CAMSHAFT VALVE CLEARANCE ADJUSTMENT
 Perform adjustment depending on selected head thickness of valve lifter (EXH).
A: Bank 1
B: Bank 2
c: φ3.4 - 4.4 mm (0.134 - 0.173 in)
: Engine front
JPBIA3515ZZ
A: Bank 2
B: Bank 1
: Engine front
: 1.96 N·m (0.20 kg-m, 1 ft-lb)
: 5.88 N·m (0.60 kg-m, 4 ft-lb)
: 10.4 N·m (1.1 kg-m, 8 ft-lb)
JPBIA3513ZZ
Revision: 2010 May2011 QX56