Infiniti 2011 QX56 User Manual

SCS-1
SUSPENSION
C
D
F
G
H
I
J
K
L
M
SECTION SCS
A
B
SCS
N
O
P
CONTENTS
SUSPENSION CONTROL SYSTEM
HBMC
PRECAUTION ............................................... 4
PRECAUTIONS ................................................... 4
Precaution for Supplemental Restraint System
(SRS) "AIR BAG" and "SEAT BELT PRE-TEN-
SIONER" ...................................................................
4
Precaution Necessary for Steering Wheel Rota-
tion after Battery Disconnect .....................................
4
Precaution for Procedure without Cowl Top Cover ......5
Precaution for Hydraulic Body-Motion Control
System ......................................................................
5
PREPARATION ............................................6
PREPARATION ................................................... 6
Special Service Tools ................................................6
Commercial Service Tools ........................................6
SYSTEM DESCRIPTION .............................. 7
DESCRIPTION .................................................... 7
Description ................................................................7
COMPONENT PARTS ........................................ 8
Component Parts Location ........................................8
Component Description .............................................8
STRUCTURE AND OPERATION ........................ 9
Hydraulic Body-Motion Control System ....................9
Shock Absorber .........................................................9
PPMU ......................................................................10
Accumulator ............................................................11
PPMU Pipe ..............................................................11
SYSTEM .............................................................12
System Diagram ......................................................12
System Description .................................................12
Component Description ...........................................14
BASIC INSPECTION ...................................15
CHECK SYSTEM PRESSURE .........................15
Work Procedure .......................................................15
PRESSURE REDUCING METHOD ..................17
Work Procedure .......................................................17
AIR BLEEDING METHOD ................................18
Work Procedure .......................................................18
CHECK INTERNAL LEAKAGE ........................20
Work Procedure .......................................................20
CHECK FOR MALFUNCTION ..........................22
Work Procedure .......................................................22
CHECK SHOCK ABSORBER FOR MAL-
FUNCTION ........................................................
24
Work Procedure .......................................................24
CHECK ORIFICE FOR CLOGGING .................27
Work Procedure .......................................................27
SYMPTOM DIAGNOSIS ..............................29
DIFFERENCE IN APPEARANCE .....................29
Description ...............................................................29
Inspection Procedure ...............................................29
LARGE ROLL ANGLE ......................................30
Description ...............................................................30
Inspection Procedure ...............................................30
REMOVAL AND INSTALLATION ...............31
HYDRAULIC BODY-MOTION CONTROL
SYSTEM ............................................................
31
Hydraulic Piping .......................................................31
FRONT TUBE ASSEMBLY .......................................31
FRONT TUBE ASSEMBLY : Exploded View ..........32
FRONT TUBE ASSEMBLY : Removal and Instal-
lation ........................................................................
32
FRONT TUBE ASSEMBLY : Inspection ..................34
Revision: 2010 May 2011 QX56

Infiniti 2011 QX56 Specifications

General

Brand	Infiniti
Model	2011 QX56
Category	Automobile
Language	English

Summary

System Precautions

SRS and Seat Belt Pre-Tensioner Safety

Safety precautions for Air Bag and Seat Belt Pre-Tensioner systems.

Power Tools and Hammer Use Warnings

Safety warnings when using power tools or hammers near sensors.

Steering Wheel Rotation Procedure

Procedure for steering wheel rotation after battery disconnection.

Hydraulic System and Cowl Cover Precautions

Precautions for hydraulic system operation and cowl top cover removal.

Service Preparation

Service Tool Identification

Lists specialized and general tools required for service procedures.

Hydraulic System Description

System Overview and Operation

Explains the purpose, benefits, and operating principles of the hydraulic system.

Component Identification and Structure

Identifies component locations, descriptions, and structural elements.

Hydraulic System Basic Inspection

Pressure Checks, Bleeding, and Leak Tests

Procedures for checking system pressure, bleeding air, and diagnosing leaks.

Malfunction and Component Specific Checks

Procedures for general malfunction checks, shock absorbers, and orifices.

Hydraulic System Symptom Diagnosis

Appearance and Roll Angle Diagnostics

Diagnosing issues based on vehicle height differences and roll angle.

Hydraulic System Removal and Installation

Hydraulic Piping and Front Tube Assembly

Procedures for removing/installing hydraulic piping and front tube assembly.

Accumulator, PPMU, and Tube Components

Procedures for accumulator, PPMU, and tube removal, installation, and inspection.

Rear Tube Assembly Procedures

Procedures for removing and installing the rear tube assembly.

Air Levelizer Precautions

SRS, Power Tools, and Steering Wheel Safety

Precautions for SRS, power tools, and steering wheel rotation.

Cowl Cover and System Specific Precautions

Precautions for cowl cover removal and air levelizer system.

Air Levelizer System Description

System Function and Components

Describes system function, component locations, and descriptions.

Structure, Operation, and Fail-safe

Explains structure, operation, system diagram, and fail-safe modes.

Air Levelizer Diagnosis Overview

CONSULT-III Functions and Results

Overview of CONSULT-III functions, self-diagnosis, and data monitoring.

DTC Index and Priority Chart

Guides for interpreting DTCs and prioritizing diagnostic steps.

Standard Vehicle Height Setting

Clearing and Adjusting Vehicle Height

Procedures for clearing and adjusting standard vehicle height.

Post-Setting DTC Check

Performing a DTC check after adjusting vehicle height.

Air Levelizer DTC/Circuit Diagnosis

Vehicle Height Sensor Diagnosis (C1801)

Diagnosis for vehicle height sensor circuit and resistance issues.

Compressor Relay and Solenoid Diagnosis (C1802, C1803)

Diagnosis for compressor relay, exhaust solenoid, and related circuits.

Height Adjustment and Sensor Voltage Diagnosis (C1804-C1807)

Diagnosis for height adjustment and sensor voltage faults.

Compressor Function, Communication, and Power/Ground Diagnosis (C1808, U1000, U1010, Power/Ground)

Diagnosis for compressor function, CAN comms, control unit errors, and power/ground.

Indicator Lamp Circuit Diagnosis (CK SUSP)

Diagnosis for the CK SUSP indicator lamp circuit.

Air Levelizer Symptom Diagnosis

Vehicle Height Control Issues

Troubleshooting steps for vehicle height not raising or lowering.

CK SUSP Indicator Lamp Behavior

Troubleshooting steps when the CK SUSP indicator lamp does not turn off.

Air Levelizer Removal and Installation

Control Module and Compressor/Tube Procedures

Procedures for removing/installing control module, compressor, and air tubes.

Vehicle Height Sensor Procedures

Procedures for removing and installing the vehicle height sensor.