2011 INFINITI QX56 oil pressure

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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Revision: 2010 May2011 QX56

CHECK ORIFICE FOR CLOGGINGSCS-27
< BASIC INSPECTION > [HBMC]
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CHECK ORIFICE FOR CLOGGING
Work ProcedureINFOID:0000000006256015
CAUTION:
 Clean surrounding areas of oil inj ection jack using steam before starting operation, since there may
be mud on it.
 Clean oil pressure gauge (special service tool: KV40108000) jack with steam before use.
1. Remove protector of PPMU.
2. Remove cap of oil injection jack.
3. Install an oil pressure gauge (SST: KV40108000) (A) to oil injec- tion jack.
CAUTION:
 Jack must be securely inserted until a click sound can beheard.
 Pressure reducing valve (B) of the oil pressure gauge
must be closed.
4. Loosen needle valves A, C, and E of PPMU by approximately 2 rotations.
CAUTION:
Never loosen the needle valve more than required.
5. Lift up the vehicle. CAUTION:
Check that tires never contact the ground.
6. Tighten needle valves A, C, and E of PPMU.
7. Lift down the vehicle. CAUTION:
Check that the lift is fully lowered.
8. Loosen pressure reducing valve (A) of oil pressure gauge and then lower pressure.
CAUTION:
Be careful since oil drains sw iftly from oil drain hole (B).
9. Check that reading of oil pressure gauge is 0 MPa. Close pres- sure reducing valve.
10. Loosen needle valve E of PPMU by approximately 2 rotations. CAUTION:
Never loosen the needle valve more than required.
11. Write down a value of the oil pressure gauge.
12. Tighten needle valve E of PPMU.
13. Loosen pressure reducing valve of oil pressure gauge and then lower pressure. CAUTION:
Be careful since oil drains swiftly from oil drain hole.
14. Check that reading of oil pressure gauge is 0 MPa. Close pressure reducing valve.
15. Loosen needle valve A of PPMU by approximately 2 rotations. CAUTION:
Never loosen the needle valve more than required.
16. Read a value of the oil pressure gauge after 5 minutes.
17. Compare difference of reading with pressure reading in step 11.
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Revision: 2010 May2011 QX56

SCS-28
< BASIC INSPECTION >[HBMC]
CHECK ORIFICE FOR CLOGGING
18. Tighten needle valve A of PPMU.
19. Loosen pressure reducing valve of oil pressure gauge and then lower pressure.
CAUTION:
Be careful since oil drains swiftly from oil drain hole.
20. Check that reading of oil pressure gauge is 0 MPa. Close pressure reducing valve.
21. Loosen needle valve C of PPMU by approximately 2 rotations. CAUTION:
Never loosen the needle valve more than required.
22. Read a value of the oil pressure gauge after 5 minutes.
23. Compare difference of reading with pressure reading in step 11.
24. Tighten needle valve C of PPMU.
25. Loosen pressure reducing valve of oil pressure gauge and then lower pressure. CAUTION:
Be careful since oil drains swiftly from oil drain hole.
26. Check that reading of oil pressure gauge is 0 MPa.
27. Remove oil pressure gauge.
28. Tighten needle valves A, C, and E of PPMU to the specified torque. Pressure difference
0.2 MPa or more : Replace the PPMU. Refer to SCS-39, "
PPMU,
MIDDLE TUBE ASSEMBLY, PPMU PIPE : Removal
and Installation".
0.2 MPa or less : Normal
Pressure difference 0.2 MPa or more : Replace the PPMU. Refer to SCS-39, "
PPMU,
MIDDLE TUBE ASSEMBLY, PPMU PIPE : Remov-
al and Installation".
0.2 MPa or less : Normal
: 8.3 N·m (0.85 kg-m, 73 in-lb)
Revision: 2010 May2011 QX56

DIFFERENCE IN APPEARANCESCS-29
< SYMPTOM DIAGNOSIS > [HBMC]
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SYMPTOM DIAGNOSIS
DIFFERENCE IN APPEARANCE
DescriptionINFOID:0000000006256016
While the vehicle is stopped, the difference of vehicle height of right side and left side (between wheel center
and wheel arch) is 25 mm (0.98 in) or more.
Inspection ProcedureINFOID:0000000006256017
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 check result normal?
YES >> GO TO 2.
NO >> Repair or replace damaged parts.
2.CHECK CLOGGING OF ORIFICE IN PPMU
1. Install an oil pressure gauge (SST: KV40108000) (A) to oil injec- tion jack.
CAUTION:
 Clean surrounding areas of oi l injection jack using steam
before starting oper ation, since there may be mud on it.
 Clean oil pressure gauge (special service tool:
KV40108000) jack with steam before use.
 Jack must be securely inserted until a click sound can be heard.
 Pressure reducing valve (B) of the oil pressure gauge
must be closed.
2. Loosen needle valves A and C of PPMU by approximately 2 rotations for check changes in vehicle height.
CAUTION:
Never loosen the needle valve more than required.
3. Tighten needle valve A and C of PPMU to the specified torque after the inspection.
Does the vehicle height change 10 mm (0.39 in) or more?
YES >> For detailed inspection of clogging of orifice in PPMU, refer to SCS-27, "
Work Procedure".
NO >> INSPECTION END
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Tightening torque : 8.3 N· m (0.85 kg-m, 73 in-lb)
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Revision: 2010 May2011 QX56

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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Revision: 2010 May2011 QX56

SCS-38
< REMOVAL AND INSTALLATION >[HBMC]
HYDRAULIC BODY-MOTION CONTROL SYSTEM
 Completely engage hooks on frame when installing accumulator
assembly.
ACCUMULATOR : InspectionINFOID:0000000006256026
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 : DisposalINFOID:0000000006256027
CAUTION:
 Always wear safety goggles.
 Always wear safety gloves.
 Be careful since pressure is higher when temperature is high.
 Be careful since metal shavings or oi l may be blown away by compressed gas.
 Discard drained oil in accordance with local laws and regulations.
WORK PROCEDURE
1. Remove both tanks using an oil filter wrench.
2. Secure tank using a vise.
3. Drill a hole as shown in the figure ( z) using an electric drill.
Drain gas and oil.
NOTE:
 Gas is colorless, odorless, and harmless.
 Use an electric drill with a drill bit of approximately 4 mm (0.16 in).
 Drilling a hole is easier when electric drill speed is slow.
PPMU, MIDDLE TUBE AS SEMBLY, PPMU PIPE
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Revision: 2010 May2011 QX56

HYDRAULIC BODY-MOTION CONTROL SYSTEMSCS-43
< REMOVAL AND INSTALLATION > [HBMC]
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PPMU, MIDDLE TUBE ASSEMBLY, PPMU PIPE : InspectionINFOID:0000000006256030
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, contact with other parts, and loose connections.
ADJUSTMENT AFTER INSTALLATION
Perform air bleeding. Refer to SCS-18, "Work Procedure".
PPMU, MIDDLE TUBE ASSEMBLY , PPMU PIPE : DisposalINFOID:0000000006256031
CAUTION:
 Always wear safety goggles.
 Always wear safety gloves.
 Be careful since pressure is higher when temperature is high.
 Be careful since metal shavings or oi l may be blown away by compressed gas.
 Discard drained oil in accordance wi th local laws and regulations.
WORK PROCEDURE
1. Remove both tanks using an oil filter wrench.
2. Secure tank using a vise.
3. Drill a hole as shown in the figure ( z) using an electric drill.
Drain gas and oil.
NOTE:
 Gas is colorless, odorless, and harmless.
 Use an electric drill with a drill bit of approximately 4 mm (0.16
in).
 Drilling a hole is easier when electric drill speed is slow.
REAR TUBE ASSEMBLY
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Revision: 2010 May2011 QX56

DIAGNOSIS SYSTEM (IPDM E/R)SEC-29
< SYSTEM DESCRIPTION > [WITH INTELLIGENT KEY SYSTEM]
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ACTIVE TEST
Te s t i t e m
*: Operates while the engine is running. DETENT SW
[Off/On]
Displays the status of the A/T shift selector (detention switch) judged by IPDM E/
R.
S/L RLY -REQ
[Off/On] Displays the status of the steering lock relay signal received from BCM via CAN
communication.
S/L STATE
[LOCK/UNLK/UNKWN] Displays the status of the steering lock judged by IPDM E/R.
OIL P SW
[Open/Close] Displays the status of the oil pressure switch judged by IPDM E/R.
HOOD SW
[Off/On] Displays the status of the hood switch judged by IPDM E/R.
HL WASHER REQ
[Off/On] Displays the status of the headlamp washer request signal received from BCM via
CAN communication.
THFT HRN REQ
[Off/On] Displays the status of the theft warning horn request signal received from BCM
via CAN communication.
HORN CHIRP
[Off/On] Displays the status of the horn reminder signal received from BCM via CAN com-
munication.
Monitor Item
[Unit] MAIN SIG-
NALS Description
Test item Operation Description
CORNERING LAMP LH
NOTE:
This item is indicated, but cannot be tested.
RH
HORN On Operates horn relay for 20 ms.
REAR DEFOGGER Off OFF
On Operates the rear window defogger relay.
FRONT WIPER Off OFF
Lo Operates the front wiper relay.
Hi Operates the front wiper relay and front wiper high relay.
MOTOR FAN* 1OFF
2 Transmits 50% pulse duty signal (PWM signal) to the cooling fan control module.
3 Transmits 75% pulse duty signal (PWM signal) to the cooling fan control module.
4
Transmits 100% pulse duty signal (PWM signal) to the cooling fan control mod-
ule.
HEAD LAMP WASHER On Operates the headlamp washer relay for 1 second.
EXTERNAL LAMPS Off OFF
TAIL Operates the tail lamp relay.
Lo Operates the headlamp low relay.
Hi
Operates the headlamp low relay and ON/OFF the headlamp high relay at 1 sec-
ond intervals.
Fog Operates the front fog lamp relay.
Revision: 2010 May2011 QX56