ABS INFINITI QX56 2011 Factory Service Manual

SCS-26
< BASIC INSPECTION >[HBMC]
CHECK SHOCK ABSORBER FOR MALFUNCTION
16. Shock absorber that is checked
is normal. Set knob (A) of sus-
pension oil pump to the direction as shown in the figure and
check that reading of pressure gauge is 0 MPa.
17. Tighten the loosened needle valve of PPMU.
18. Remove leak check plug from pipe. Install pipe to lower portion of shock absorber and tighten pipe to the specified torque.
CAUTION:
 O-ring must be free of scratches and damage.
 Piping must be kept free of th e intrusion of dust and dirt.
19. Check other shock absorbers in accor dance with procedures of steps 8 to 18.
20. Tighten needle valves A, C, and E of PPMU to t he specified torque, after completion of check.
21. Loosen needle valves B and D of PPMU by approximat ely 2 rotations and then tighten lock nuts to the
specified torque.
CAUTION:
Never loosen the needle valve more than required. Tightening torque : 5.0 N·
m (0.51 kg-m, 44 in-lb)
Tightening torque : 8.3 N· m (0.85 kg-m, 73 in-lb)
Tightening torque : 20 N·m (2.0 kg-m, 15 ft-lb)
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SCS-30
< SYMPTOM DIAGNOSIS >[HBMC]
LARGE ROLL ANGLE
LARGE ROLL ANGLE
DescriptionINFOID:0000000006256018
During cornering, inclination of the vehi
cle to outer side of corner is large.
Inspection ProcedureINFOID:0000000006256019
1.CHECK APPEARANCE
1. Visually check that the exterior parts (e.g. suspension spring) have no malfunctions.
2. Visually check tube and pipe for crush or oil leakage.
Is the inspection result normal?
YES >> GO TO 2.
NO >> Repair or replace damaged parts.
2.CHECK NEEDLE VALVE OF PPMU
Check that needle valves A and C are tightened to the specified
torque.
Is the inspection result normal?
YES >> GO TO 3.
NO >> Tighten to the specified torque.
3.SYSTEM PRESSURE CHECK
Check system pressure. Refer to SCS-15, "
Work Procedure".
Is the inspection result normal?
YES >> GO TO 4.
NO >> Perform adjustment of system pressure. Refer to SCS-18, "
Work Procedure".
4.CHECK INTERNAL LEAKAGE
Check internal leakage. Refer to SCS-20, "
Work Procedure".
Is the inspection result normal?
YES >> INSPECTION END
NO >> GO TO 5.
5.CHECK MALFUNCTIONING PART
Identify malfunctioning part. Refer to SCS-22, "
Work Procedure".
Does the pressure increase?
YES >> Replace the PPMU. Refer to SCS-39, "PPMU, MIDDLE TUBE ASSEMBLY, PPMU PIPE :
Removal and Installation".
NO >> GO TO 6.
6.CHECK SHOCK ABSORBER
Identify malfunctioning shock absorber. Refer to SCS-24, "
Work Procedure".
>> Replace identified shock absorber. Refer to FSU-10, "
Removal and Installation" (front), RSU-8,
"Removal and Installation" (rear).
Tightening torque : 8.3 N·
m (0.85 kg-m, 73 in-lb)
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SCS-32
< REMOVAL AND INSTALLATION >[HBMC]
HYDRAULIC BODY-MOTION CONTROL SYSTEM
FRONT TUBE ASSEMBLY : Exploded View
INFOID:0000000006256021
FRONT TUBE ASSEMBLY : Removal and InstallationINFOID:0000000006256022
REMOVAL
Front Tube Assembly A (from Front Shock Absorber RH Upper to Front Shock Absorber LH Lower)
1. Reduce system pressure. Refer to SCS-17, "Work Procedure".
1. Protector B 2. Bushing 3. Collar
4. Bleeder valve 5. Cap 6. O-ring
7. Front tube assembly A 8. Front tube assembly B 9. Protector A
A. To front shock absorber LH B. To front shock absorber RH
:Vehicle front
:Apply genuine NISSAN hydraulic
suspension fluid
Refer to GI-4, "
Components" for symbols not described on the above.
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Revision: 2010 May2011 QX56

HYDRAULIC BODY-MOTION CONTROL SYSTEMSCS-33
< REMOVAL AND INSTALLATION > [HBMC]
C
D
F
G H
I
J
K L
M A
B
SCS
N
O P
2. Disconnect lower side pipe (A) of front shock absorber LH.
3. Disconnect pipe (A) of accumulator assembly LH from left side 3-way (B).
4. Disconnect upper side pipe (A) of front shock absorber RH.
5. Remove protector A with power tool.
6. Remove mounting bolts of left side 3-way.
7. Remove protector B with power tool.
8. Remove mounting bolts of each bracket.
9. Remove front tube assembly A from the vehicle.
10. Perform inspection after removal. Refer to SCS-34, "
FRONT
TUBE ASSEMBLY : Inspection".
Front Tube Assembly B (from Front Shock Absorber LH Upper to Front Shock Absorber RH Lower)
1. Reduce system pressure. Refer to SCS-17, "Work Procedure".
2. Disconnect upper side pipe (B) of front shock absorber LH.
B : Upper side pipe
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B : Lower side pipe
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A : Lower side pipe
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SCS-34
< REMOVAL AND INSTALLATION >[HBMC]
HYDRAULIC BODY-MOTION CONTROL SYSTEM
3. Disconnect pipe (A) of accumulator assembly RH from right side
3-way (B).
4. Disconnect lower side pipe (B) of front shock absorber RH.
5. Remove protector A with power tool.
6. Remove mounting bolts of right side 3-way.
7. Remove protector B with power tool.
8. Remove mounting bolts of each bracket.
9. Remove front tube assembly B from the vehicle.
10. Perform inspection after removal. Refer to SCS-34, "
FRONT
TUBE ASSEMBLY : Inspection".
INSTALLATION
Note the following, and install in the reverse order of removal.
 Apply genuine NISSAN hydraulic suspension fluid to O-ring.
 Check connection portion of each piping for dirt or dust.
 Completely insert guide (A) to guide hole on frame when installing
left side 3-way.
 For tightening torque for pipe of accumulator assembly LH, refer to SCS-35, "
ACCUMULATOR : Exploded View".
 For tightening torque for pipe of accumulator assembly RH, refer to
SCS-35, "
ACCUMULATOR : Exploded View".
FRONT TUBE ASSEMBLY : InspectionINFOID:0000000006256023
INSPECTION AFTER REMOVAL
 O-ring must be free of scratches and damage.
 Pipe and tube must be free of scratches and damage.
INSPECTION AFTER INSTALLATION
Check oil leakage, twists, deformation, cont act with other parts, and loose connections.
ADJUSTMENT AFTER INSTALLATION
Perform air bleeding. Refer to SCS-18, "Work Procedure".
ACCUMULATOR
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A : Upper side pipe
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Revision: 2010 May2011 QX56

HYDRAULIC BODY-MOTION CONTROL SYSTEMSCS-39
< REMOVAL AND INSTALLATION > [HBMC]
C
D
F
G H
I
J
K L
M A
B
SCS
N
O P
PPMU, MIDDLE TUBE ASSEMBLY, PPMU PIPE : Exploded ViewINFOID:0000000006256028
PPMU, MIDDLE TUBE ASSEMBLY, PPMU PIPE : Removal and Installation
INFOID:0000000006256029
REMOVAL
PPMU
1. PPMU pipe B 2. Cap 3. Middle tube assembly RH
4. O-ring 5. Bleeder valve 6. Middle tube assembly LH
7. PPMU 8. Cap 9. Protector
10. PPMU pipe A
A. To rear shock absorber RH B. To rear shock absorber LH
:Vehicle front
:Apply genuine NISSAN hydraulic
suspension fluid
Refer to GI-4, "
Components" for symbols not described on the above.
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SCS-40
< REMOVAL AND INSTALLATION >[HBMC]
HYDRAULIC BODY-MOTION CONTROL SYSTEM
1. Reduce system pressure. Refer to
SCS-17, "Work Procedure".
2. Remove protector.
3. Disconnect PPMU pipe A and PPMU pipe B from PPMU.
4. Remove mounting bolts of PPMU.
5. Remove PPMU from the vehicle.
6. Perform inspection after removal. Refer to SCS-43, "
PPMU, MIDDLE TUBE ASSEMBLY, PPMU PIPE :
Inspection".
Middle Tube Assembly LH (from Rear Shock Absorber LH Upper to Left Side Middle Joint)
1. Reduce system pressure. Refer to SCS-17, "Work Procedure".
2. Remove PPMU.
3. Disconnect upper side pipe (A) of rear shock absorber LH.
4. Disconnect pipe (A) of rear tube assembly B from left side rear joint (B).
5. Disconnect pipe (A) of accumulator assembly LH from left side middle joint (B).
6. Disconnect PPMU pipe A (A) from left side middle joint (B).
7. Separate chassis and body. Refer to DLK-251, "
Removal and
Installation".
8. Remove mounting bolts of each bracket.
9. Remove middle tube assembly LH from the vehicle.
10. Perform inspection after removal. Refer to SCS-43, "
PPMU,
MIDDLE TUBE ASSEMBLY, PPMU PIPE : Inspection".
B : Lower side pipe
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Revision: 2010 May2011 QX56

HYDRAULIC BODY-MOTION CONTROL SYSTEMSCS-41
< REMOVAL AND INSTALLATION > [HBMC]
C
D
F
G H
I
J
K L
M A
B
SCS
N
O P
Middle Tube Assembly RH (from
Rear Shock Absorber RH Upper to Right Side Middle Joint)
1. Reduce system pressure. Refer to SCS-17, "Work Procedure".
2. Disconnect upper side pipe (A) of rear shock absorber RH.
3. Disconnect pipe (A) of rear tube assembly A from right side rear joint (B).
4. Remove pipe (A) of accumulator assembly RH from right side middle joint (B).
5. Disconnect PPMU pipe B (A) from right side middle joint (B).
6. Separate chassis and body. Refer to DLK-251, "
Removal and
Installation".
7. Remove mounting bolts of each bracket.
8. Remove middle tube assembly RH from the vehicle.
9. Perform inspection after removal. Refer to SCS-43, "
PPMU,
MIDDLE TUBE ASSEMBLY, PPMU PIPE : Inspection".
PPMU pipe A and PPMU pipe B
1. Reduce system pressure. Refer to SCS-17, "Work Procedure".
2. Remove PPMU pipe A from left side middle joint.
3. Remove PPMU pipe B from right side middle joint.
4. Separate chassis and body. Refer to DLK-251, "
Removal and Installation".
5. Remove PPMU pipe B from the vehicle.
6. Perform inspection after removal. Refer to SCS-43, "
PPMU, MIDDLE TUBE ASSEMBLY, PPMU PIPE :
Inspection".
B : Lower side pipe
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Revision: 2010 May2011 QX56

SCS-42
< REMOVAL AND INSTALLATION >[HBMC]
HYDRAULIC BODY-MOTION CONTROL SYSTEM
INSTALLATION
PPMU
Note the following, and install in the reverse order of removal.
 Check connection portion of each piping for dirt or dust.
 Completely engage hooks of bracket on frame when installing
PPMU.
Middle Tube Assembly LH (from Rear Shock Absorber LH Upper to Left Side Middle Joint)
Note the following, and install in the reverse order of removal.
 Apply genuine NISSAN hydraulic suspension fluid to O-ring.
 Check connection portion of each piping for dirt or dust.
 For tightening torque for pipe of rear tube assembly B, refer to SCS-44, "
REAR TUBE ASSEMBLY :
Exploded View".
 For tightening torque for pipe of accumulator assembly LH, refer to SCS-35, "
ACCUMULATOR : Exploded
View".
 Completely insert guide (A) to guide hole on frame when installing left side middle joint.
Middle Tube Assembly RH (fro m Rear Shock Absorber RH Upper to Right Side Middle Joint)
 O-ring must be free of scratches and damage.
 Apply genuine NISSAN hydraulic suspension fluid to O-ring.
 Check connection portion of each piping for dirt or dust.
 For tightening torque for pipe of rear tube assembly A refer to SCS-44, "
REAR TUBE ASSEMBLY :
Exploded View".
 For tightening torque for pipe of accumulator assembly RH, refer to SCS-35, "
ACCUMULATOR : Exploded
View".
 Completely insert guide (A) to guide hole on frame when installing right side middle joint.
PPMU pipe A and PPMU pipe B
Install in the reverse order of removal.
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SCS-44
< REMOVAL AND INSTALLATION >[HBMC]
HYDRAULIC BODY-MOTION CONTROL SYSTEM
REAR TUBE ASSEMBLY : Exploded View
INFOID:0000000006256032
REAR TUBE ASSEMBLY : Removal and InstallationINFOID:0000000006256033
REMOVAL
Rear Tube Assembly A (from Rear Shock Abso rber LH Lower to Right Side Rear Joint)
1. Reduce system pressure. Refer to SCS-17, "Work Procedure".
2. Remove rear muffler. Refer to EX-5, "
Removal and Installation".
1. Rear tube assembly A 2. O-ring 3. Rear tube assembly B
:Vehicle front
:Apply genuine NISSAN hydraulic
suspension fluid
Refer to GI-4, "
Components" for symbols not described on the above.
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Revision: 2010 May2011 QX56