Infiniti QX56 (JA60). Manual — part 818
SUSPENSION CONTROL SYSTEM INOPERATIVE
SCS-37
< SYMPTOM DIAGNOSIS >
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SUSPENSION CONTROL SYSTEM INOPERATIVE
Description
INFOID:0000000005148194
The suspension control system does not activate. It does not raise or lower the vehicle in response to ride
height changes.
Diagnosis Procedure
INFOID:0000000005148195
1.
SUSPENSION CONTROL UNIT POWER AND GROUND INSPECTION
Check the suspension control unit power and ground supply. Refer to
.
Does the suspension control unit power and ground pass inspection?
YES
>> GO TO 2.
NO
>> Repair or replace the malfunctioning part.
2.
CHECK HEIGHT SENSOR SIGNAL INPUT
CONSULT-III DATA MONITOR
1. Turn ignition switch ON.
2. Select "HEIGT SEN" of AIR LEVELIZER data monitor item.
3. Check the monitor status.
Is the height sensor voltage normal?
YES
>> GO TO 3.
NO
>> Check height sensor signal circuit. Refer to
3.
CHECK GENERATOR "L" CIRCUIT SIGNAL
CONSULT-III DATA MONITOR
1. Start the engine.
2. Select "ACG L" of AIR LEVELIZER data monitor item.
3. Check the monitor status.
Is the generator "L" signal operating normally?
YES
>> GO TO 4.
NO
>> Check generator L circuit. Refer to
4.
SUSPENSION AIR COMPRESSOR POWER AND GROUND INSPECTION
Check the suspension air compressor power and ground supply. Refer to
PRESSOR : Diagnosis Procedure"
.
Does the suspension air compressor power and ground pass inspection?
YES
>> System is operating normally.
NO
>> Repair or replace the malfunctioning part.
HEIGT SEN
: 0.2V - 4.8V
ACG L
: OFF with charge light OFF
: ON with charge light ON
SCS-38
< SYMPTOM DIAGNOSIS >
SUSPENSION CONTROL SYSTEM DOES NOT RAISE
SUSPENSION CONTROL SYSTEM DOES NOT RAISE
Description
INFOID:0000000005148196
The suspension control system does not raise the vehicle in accordance with ride height changes.
Diagnosis Procedure
INFOID:0000000005148197
1.
SUSPENSION CONTROL UNIT POWER AND GROUND INSPECTION
Check the suspension control unit power and ground supply. Refer to
.
Does the suspension control unit power and ground pass inspection?
YES
>> GO TO 2.
NO
>> Repair or replace the malfunctioning part.
2.
CHECK HEIGHT SENSOR SIGNAL INPUT
CONSULT-III DATA MONITOR
1. Turn ignition ON.
2. Select "HEIGT SEN" of AIR LEVELIZER data monitor item.
3. Check the monitor status.
Is the height sensor voltage normal?
YES
>> GO TO 3.
NO
>> Check height sensor signal circuit. Refer to
3.
SUSPENSION AIR COMPRESSOR POWER AND GROUND INSPECTION
Check the suspension air compressor power and ground supply. Refer to
PRESSOR : Diagnosis Procedure"
.
Does the suspension air compressor power and ground pass inspection?
YES
>> Inspect for a weak compressor, leak or restriction in the system. Repair or replace malfunctioning
part.
NO
>> Repair or replace the malfunctioning part.
HEIGT SEN
: 0.2V - 4.8V
SUSPENSION CONTROL SYSTEM DOES NOT LOWER
SCS-39
< SYMPTOM DIAGNOSIS >
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SUSPENSION CONTROL SYSTEM DOES NOT LOWER
Description
INFOID:0000000005148198
The suspension control system does not lower the vehicle in accordance with ride height changes.
Diagnosis Procedure
INFOID:0000000005148199
1.
SUSPENSION CONTROL UNIT POWER AND GROUND INSPECTION
Check the suspension control unit power and ground supply. Refer to
.
Does the suspension control unit power and ground pass inspection?
YES
>> GO TO 2.
NO
>> Repair or replace the malfunctioning part.
2.
CHECK HEIGHT SENSOR SIGNAL INPUT
CONSULT-III DATA MONITOR
1. Turn ignition ON.
2. Select "HEIGT SEN" of AIR LEVELIZER data monitor item.
3. Check the monitor status.
Is the height sensor voltage normal?
YES
>> GO TO 3.
NO
>> Check height sensor signal circuit. Refer to
3.
EXHAUST VALVE SOLENOID CIRCUIT INSPECTION
Check the exhaust valve solenoid circuit. Refer to
SCS-24, "Component Function Check"
Does the exhaust valve solenoid circuit pass inspection?
YES
>> Inspect for a restriction in the system. repair or replace the malfunctioning part.
NO
>> Repair or replace the malfunctioning part.
HEIGT SEN
: 0.2V - 4.8V
SCS-40
< PRECAUTION >
PRECAUTIONS
PRECAUTION
PRECAUTIONS
Precaution for Supplemental Restraint System (SRS) "AIR BAG" and "SEAT BELT
PRE-TENSIONER"
INFOID:0000000005383225
The Supplemental Restraint System such as “AIR BAG” and “SEAT BELT PRE-TENSIONER”, used along
with a front seat belt, helps to reduce the risk or severity of injury to the driver and front passenger for certain
types of collision. This system includes seat belt switch inputs and dual stage front air bag modules. The SRS
system uses the seat belt switches to determine the front air bag deployment, and may only deploy one front
air bag, depending on the severity of a collision and whether the front occupants are belted or unbelted.
Information necessary to service the system safely is included in the SR and SB section of this Service Man-
ual.
WARNING:
• To avoid rendering the SRS inoperative, which could increase the risk of personal injury or death in
the event of a collision which would result in air bag inflation, all maintenance must be performed by
an authorized NISSAN/INFINITI dealer.
• Improper maintenance, including incorrect removal and installation of the SRS, can lead to personal
injury caused by unintentional activation of the system. For removal of Spiral Cable and Air Bag
Module, see the SR section.
• Do not use electrical test equipment on any circuit related to the SRS unless instructed to in this
Service Manual. SRS wiring harnesses can be identified by yellow and/or orange harnesses or har-
ness connectors.
PRECAUTIONS WHEN USING POWER TOOLS (AIR OR ELECTRIC) AND HAMMERS
WARNING:
• When working near the Airbag Diagnosis Sensor Unit or other Airbag System sensors with the Igni-
tion ON or engine running, DO NOT use air or electric power tools or strike near the sensor(s) with a
hammer. Heavy vibration could activate the sensor(s) and deploy the air bag(s), possibly causing
serious injury.
• When using air or electric power tools or hammers, always switch the Ignition OFF, disconnect the
battery, and wait at least 3 minutes before performing any service.
Precaution for Rear Suspension
INFOID:0000000005148201
• When installing the rubber bushings, the final tightening must be done under unladen condition and with the
tires on level ground. Oil will shorten the life of the rubber bushings, so wipe off any spilled oil immediately.
• Unladen condition means the fuel tank, engine coolant and lubricants are at the full specification. The spare
tire, jack, hand tools, and mats are in their designated positions.
• After installing suspension components, check the wheel alignment.
• Caulking nuts are not reusable. Always use new caulking nuts for installation. New caulking nuts are pre-
oiled, do not apply any additional lubrication.
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