2007 INFINITI M35 power steering system

HARNESS
PG-95
C
D
E
F
G
H
I
J
L
MA
B
PG
Revision: 2007 April2007 M35/M45
Wiring Diagram Codes (Cell Codes) NKS004ET
Use the chart below to find out what each wiring diagram code stands for.
Refer to the wiring diagram code in the alphabetical index to find the location (page number) of each wiring
diagram.
Code Section Wiring Diagram Name
A/C ATC Air Conditioner
AF1B1 EC Air Fuel Ratio Sensor 1 Bank 1
AF1B2 EC Air Fuel Ratio Sensor 1 Bank 2
AF1HB1 EC Air Fuel Ratio Sensor 1 Heater Bank 1
AF1HB2 EC Air Fuel Ratio Sensor 1 Heater Bank 2
AFS LT Adaptive Front Lighting System
APPS1 EC Accelerator Pedal Position Sensor
APPS2 EC Accelerator Pedal Position Sensor
APPS3 EC Accelerator Pedal Position Sensor
ASC/BS EC Automatic Speed Control Device (ASCD) Brake Switch
ASC/SW EC Automatic Speed Control Device (ASCD) Steering Switch
ASCBOF EC Automatic Speed Control Device (ASCD) Brake Switch
ASCIND EC Automatic Speed Control Device (ASCD) Indicator
AT/IND DI A/T Indicator Lamp
AUT/DP SE Automatic Drive Positioner
AUTO/L LT Automatic Light System
AV AV Audio and Visual System
AWD TF AWD Control System
BACK/L LT Back-Up Lamp
BRK/SW EC Brake Switch
C/SEAT SE Climate Controlled Seat
CAN AT CAN Communication Line
CAN EC CAN Communication Line
CAN LAN CAN System
CHARGE SC Charging System
CHIME DI Warning Chime
CIGAR WW Cigarette Lighter
CLOCK DI Clock
COMBSW LT Combination Switch
COMPAS DI Compass and Thermometer
COOL/F EC Cooling Fan Control
CUR/SE EC Battery Current Sensor
D/LOCK BL Power Door Lock
DEF GW Rear Window Defogger
DTRL LT Headlamp - with Daytime Light System
ECM/PW EC ECM Power Supply for Back-Up
ECTS EC Engine Coolant Temperature Sensor
ENG/ST BL Engine Start System
EPS STC Electric Controlled Power Steering System
ETC1 EC Electric Throttle Control Function
ETC2 EC Electric Throttle Control Motor Relay

PG-96
HARNESS
Revision: 2007 April2007 M35/M45
ETC3 EC Electric Throttle Control Motor
F/FOG LT Front Fog Lamp
F/PUMP EC Fuel Pump
FPCM EC Fuel Pump Control Module
FTS AT A/T Fluid Temperature Sensor Circuit
FTTS EC Fuel Tank Temperature Sensor
FUELB1 EC Fuel Injection System Function (Bank 1)
FUELB2 EC Fuel Injection System Function (Bank 2)
H/LAMP LT Headlamp
HORN WW Horn
HSEAT SE Heated Seat
I/KEY BL Intelligent Key System
I/MIRR GW Inside Mirror (Auto Anti-Dazzling Mirror)
IATS EC Intake Air Temperature Sensor
ICC ACS Intelligent Cruise Control System
ICC/BS EC ICC Brake Switch
ICC/SW EC ICC Steering Switch
ICCBOF EC ICC Brake Switch
IGNSYS EC Ignition System
ILL LT Illumination
INJECT EC Injector
IVCB1 EC Intake Valve Timing Control Solenoid Valve Bank 1
IVCB2 EC Intake Valve Timing Control Solenoid Valve Bank 2
IVCSB1 EC Intake Valve Timing Control Position Sensor Bank 1
IVCSB2 EC Intake Valve Timing Control Position Sensor Bank 2
IVTB1 EC Intake Valve Timing Control System (Bank 1)
IVTB2 EC Intake Valve Timing Control System (Bank 2)
KS EC Knock Sensor
LDW DI Lane Departure Warning System
MAFS EC Mass Air Flow Sensor
MAIN AT Main Power Supply and Ground Circuit
MAIN EC Main Power Supply and Ground Circuit
METER DI Speedometer, Tachometer, Temp., Oil and Fuel Gauges
MIL/DL EC MIL & Data Link Connector
MIRROR GW Door Mirror
MMSW AT Manual Mode Switch
NATS BL Nissan Anti-Theft System
NONDTC AT Non-Detective Items
O2H2B1 EC Heated Oxygen Sensor 2 Heater Bank 1
O2H2B2 EC Heated Oxygen Sensor 2 Heater Bank 2
O2S2B1 EC Heated Oxygen Sensor 2 Bank 1
O2S2B2 EC Heated Oxygen Sensor 2 Bank 2
P/SCKT WW Power Socket
PDU PG Power Distribution Unit Code Section Wiring Diagram Name

HARNESS
PG-97
C
D
E
F
G
H
I
J
L
MA
B
PG
Revision: 2007 April2007 M35/M45
PGC/V EC EVAP Canister Purge Volume Control Solenoid Valve
PHASE EC Camshaft Position Sensor (PHASE)
PHSB1 EC Camshaft Position Sensor (PHASE) (Bank 1)
PHSB2 EC Camshaft Position Sensor (PHASE) (Bank 2)
PNP/SW AT Park/Neutral Position Switch
PNP/SW EC Park/Neutral Position Switch
POS EC Crankshaft Position Sensor (CKPS) (POS)
POWER PG Power Supply Routing Circuit
PRE/SE EC EVAP Control System Pressure Sensor
PS/SEN EC Power Steering Pressure Sensor
PSB SB Pre-Crash Seat Belt
R/SEAT SE Auto Return Seat
RAS STC Rear Active Steer
ROOM/L LT Interior Room Lamp
RP/SEN EC Refrigerant Pressure Sensor
SEAT SE Power Seat
SEN/PW EC Sensor Power Supply
SHADE EI Rear Sunshade
SHIFT AT A/T Shift Lock System
SNOWSW EC Snow Mode Switch
SROOF RF Sunroof
SRS SRS Supplemental Restraint System
START SC Starting System
STOP/L LT Stop Lamp
STSIG AT Start Signal Circuit
T/WARN WT Low Tire Pressure Warning System
TAIL/L LT Parking, License and Tail Lamps
TLID BL Trunk Lid Opener
TPS1 EC Throttle Position Sensor (Sensor 1)
TPS2 EC Throttle Position Sensor (Sensor 2)
TPS3 EC Throttle Position Sensor
TRNSCV BL Homelink Universal Transceiver
TURN LT Turn Signal and Hazard Warning Lamp
VDC BRC Vehicle Dynamics Control System
VEHSEC BL Vehicle Security System
VENT/V EC EVAP Canister Vent Control Valve
VIAS EC Variable Induction Air Control System
VIAS/V EC VIAS Control Solenoid Valve
VSSA/T AT Vehicle speed Sensor A/T (Revolution Sensor)
WARN DI Warning Lamps
WINDOW GW Power Window
WIPER WW Front Wiper and Washer Code Section Wiring Diagram Name

PS-1
POWER STEERING SYSTEM
G STEERING
CONTENTS
C
D
E
F
H
I
J
K
L
M
SECTION PS
A
B
PS
Revision: 2007 April2007 M35/M45
POWER STEERING SYSTEM
PRECAUTIONS .......................................................... 3
Precautions for Supplemental Restraint System
(SRS) “AIR BAG” and “SEAT BELT PRE-TEN-
SIONER” .................................................................. 3
Precautions Necessary for Steering Wheel Rotation
After Battery Disconnect .......................................... 3
OPERATION PROCEDURE ................................. 3
Precautions for Steering System .............................. 4
PREPARATION ........................................................... 5
Special Service Tools ............................................... 5
Commercial Service Tools ........................................ 6
NOISE, VIBRATION AND HARSHNESS (NVH)
TROUBLESHOOTING ................................................ 7
NVH Trouble Shooting Chart .................................... 7
POWER STEERING FLUID ........................................ 8
Checking Fluid Level ................................................ 8
Checking Fluid Leakage ........................................... 8
Air Bleeding Hydraulic System ................................. 8
STEERING WHEEL .................................................. 10
On-Vehicle Inspection and Service ........................ 10
CHECKING CONDITION OF INSTALLATION .... 10
CHECKING STEERING WHEEL PLAY .............. 10
CHECKING NEUTRAL POSITION STEERING
WHEEL ............................................................... 10
CHECKING STEERING WHEEL TURNING
FORCE ................................................................ 10
CHECKING FRONT WHEEL TURNING ANGLE .... 11
Removal and Installation ........................................ 12
REMOVAL ........................................................... 12
INSTALLATION ................................................... 12
STEERING COLUMN ............................................... 13
Removal and Installation ........................................ 13
COMPONENTS .................................................. 13
REMOVAL OF UPPER JOINT, COLLAR, HOLE
COVER SEAL, HOLE COVER, LOWER SHAFT
AND LOWER JOINT ........................................... 14
INSPECTION AFTER REMOVAL ....................... 14INSTALLATION OF UPPER JOINT, COLLAR,
HOLE COVER SEAL, HOLE COVER, LOWER
SHAFT AND LOWER JOINT .............................. 14
REMOVAL OF STEERING COLUMN ASSEM-
BLY ...................................................................... 15
INSPECTION AFTER REMOVAL ....................... 16
INSTALLATION OF STEERING COLUMN
ASSEMBLY ......................................................... 16
INSPECTION AFTER INSTALLATION ................ 16
Disassembly and Assembly .................................... 17
COMPONENTS ................................................... 17
DISASSEMBLY ................................................... 17
INSPECTION AFTER DISASSEMBLY ................ 17
ASSEMBLY ......................................................... 17
INSPECTION AFTER ASSEMBLY ...................... 18
POWER STEERING GEAR AND LINKAGE ............ 19
Removal and Installation ........................................ 19
COMPONENTS ................................................... 19
REMOVAL ........................................................... 19
INSTALLATION ................................................... 20
INSPECTION AFTER INSTALLATION ................ 20
Disassembly and Assembly .................................... 21
COMPONENTS ................................................... 21
DISASSEMBLY ................................................... 22
INSPECTION AFTER DISASSEMBLY ................ 23
ASSEMBLY ......................................................... 25
POWER STEERING OIL PUMP ............................... 30
On-Vehicle Inspection and Service ......................... 30
CHECKING RELIEF OIL PRESSURE ................ 30
Removal and Installation ........................................ 30
REMOVAL ........................................................... 30
INSTALLATION ................................................... 30
Disassembly and Assembly (Models with VK45DE) ... 31
COMPONENTS ................................................... 31
INSPECTION BEFORE DISASSEMBLY ............. 31
DISASSEMBLY ................................................... 32
INSPECTION AFTER DISASSEMBLY ................ 32

PRECAUTIONS
PS-3
C
D
E
F
H
I
J
K
L
MA
B
PS
Revision: 2007 April2007 M35/M45
PRECAUTIONSPFP:00001
Precautions for Supplemental Restraint System (SRS) “AIR BAG” and “SEAT
BELT PRE-TENSIONER”
NGS000CZ
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 SRS 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 per-
formed by an authorized NISSAN/INFINITI dealer.

Improper maintenance, including incorrect removal and installation of the SRS, can lead to per-
sonal injury caused by unintentional activation of the system. For removal of Spiral Cable and Air
Bag Module, see the SRS 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
harness connectors.
Precautions Necessary for Steering Wheel Rotation After Battery DisconnectNGS000D0
NOTE:

This Procedure is applied only to models with Intelligent Key system and NVIS/IVIS (NISSAN/INFINITI
VEHICLE IMMOBILIZER SYSTEM - NATS).

Remove and install all control units after disconnecting both battery cables with the ignition knob in the
″LOCK″ position.

Always use CONSULT-III to perform self-diagnosis as a part of each function inspection after finishing
work. If DTC is detected, perform trouble diagnosis according to self-diagnostic results.
For models equipped with the Intelligent Key system and NVIS/IVIS, an electrically controlled steering lock
mechanism is adopted on the key cylinder.
For this reason, if the battery is disconnected or if the battery is discharged, the steering wheel will lock and
steering wheel rotation will become impossible.
If steering wheel rotation is required when battery power is interrupted, follow the procedure below before
starting the repair operation.
OPERATION PROCEDURE
1. Connect both battery cables.
NOTE:
Supply power using jumper cables if battery is discharged.
2. Use the Intelligent Key or mechanical key to turn the ignition switch to the ″ACC″ position. At this time, the
steering lock will be released.
3. Disconnect both battery cables. The steering lock will remain released and the steering wheel can be
rotated.
4. Perform the necessary repair operation.
5. When the repair work is completed, return the ignition switch to the ″LOCK″ position before connecting
the battery cables. (At this time, the steering lock mechanism will engage.)
6. Perform a self-diagnosis check of all control units using CONSULT-III.

PS-8
POWER STEERING FLUID
Revision: 2007 April2007 M35/M45
POWER STEERING FLUIDPFP:KLF20
Checking Fluid LevelNGS000D5

Check fluid level with engine stopped.

Make sure that fluid level is between MIN and MAX.

Fluid levels at HOT and COLD are different. Do not confuse
them.
CAUTION:

The fluid level should not exceed the MAX line. Excessive
fluid will cause fluid leakage from the cap.

Do not reuse drained power steering fluid.

Recommended fluid is Genuine Nissan PSF or equiva-
lent.
Checking Fluid LeakageNGS000D6
Check hydraulic connections for fluid leakage, cracks, damage,
looseness, or wear.
1. Run engine until the fluid temperature reaches 50 to 80° C (122
to 176°F) in reservoir tank, and keep engine speed idle.
2. Turn steering wheel several times from full left stop to full right
stop.
3. Hold steering wheel at each lock position for five seconds and
carefully, check for fluid leakage.
CAUTION:
Do not hold the steering wheel in a locked position for more
than 10 seconds. (There is the possibility that oil pump may
be damaged.)
4. If fluid leakage at connections is noticed, then loosen flare nut and then retighten. Do not overtighten con-
nector as this can damage O-ring, washer and connector.
5. If fluid leakage from oil pump is noticed, check oil pump. Refer to PS-30, "
POWER STEERING OIL
PUMP" .
6. Check steering gear boots for accumulation of fluid indicating from steering gear.
Air Bleeding Hydraulic SystemNGS000D7
If air bleeding is not complete, the following symptoms can be observed.

Bubbles are created in reservoir tank.

Clicking noise can be heard from oil pump.

Excessive buzzing in the oil pump.
NOTE:
Fluid noise may occur in the steering gear or oil pump. This does not affect performance or durability of
the system.
1. Turn steering wheel several times from full left stop to full right stop with engine off.
CAUTION:
Filling reservoir tank with fluid so as not to lower fluid level below the MIN line while steering
wheel turning.
2. Start engine and hold steering wheel at each lock position for 3 seconds at idle to check for fluid leakage.
3. Repeat step 2 above several times at approximately 3 second intervals.
CAUTION:
Do not hold the steering wheel in a locked position for more than 10 seconds. (There is the possi-
bility that oil pump may be damaged.)
4. Check fluid for bubbles and while contamination.HOT : Fluid temperature 50 - 80 °C (122 - 176°F)
COLD : Fluid temperature 0 - 30°C (32 - 86°F)
PGIA0007J
SGIA0506E

PS-20
POWER STEERING GEAR AND LINKAGE
Revision: 2007 April2007 M35/M45
8. Remove steering hydraulic piping bracket from front suspension member. Refer to PS-39, "HYDRAULIC
LINE" .
9. Remove power steering solenoid valve harness connector. Refer to PS-21, "
COMPONENTS" .
10. Remove rack stay (2WD) or front cross bar (AWD). Refer to FSU-8, "
Components" , FSU-26, "Compo-
nents" .
11. Remove mounting bolts and nuts of steering gear assembly, and then remove steering gear assembly
from vehicle.
INSTALLATION
Installation is the reverse order of removal. For tightening torque, refer to PS-19, "COMPONENTS" .

When installing lower joint to steering gear assembly, follow the procedure listed below.
–Set rack of steering gear in the neutral position.
NOTE:
To get the neutral position of rack, turn gear-sub assembly and measure the distance of inner socket, and
then measure the intermediate position of the distance.
–Align rear cover cap projection (A) with the marking position (B)
of gear housing assembly.
–Install slit part of lower joint (C) aligning with the projection (A) of
rear cover cap (1). Make sure that the slit part of lower joint (C)
is aligned with both the projection (A) of rear cover cap (1) and
the marking position (B) of gear housing assembly.

After installation, bleed air from the steering hydraulic system.
Refer to PS-8, "
Air Bleeding Hydraulic System" .

Perform final tightening of nuts and bolts on each part under
unladen conditions with tires on level ground when removing
steering gear assembly. Check wheel alignment. Refer to FSU-
6, "Wheel Alignment Inspection" , FSU-24, "Wheel Alignment
Inspection" .

Adjust neutral position of steering angle sensor after checking wheel alignment. Refer to BRC-6, "Adjust-
ment of Steering Angle Sensor Neutral Position" .
INSPECTION AFTER INSTALLATION
Make sure that steering wheel operates smoothly by turning several times from full left stop to full right stop.
SGIA1175E

PS-30
POWER STEERING OIL PUMP
Revision: 2007 April2007 M35/M45
POWER STEERING OIL PUMPPFP:49110
On-Vehicle Inspection and ServiceNGS000DE
CHECKING RELIEF OIL PRESSURE
CAUTION:
Make sure that belt tension is normal before starting the following procedure.
1. Connect the hydraulic pressure gauge [SST] between oil pump
discharge connector and high-pressure hose. Bleed air from the
hydraulic circuit while opening valve fully. Refer to PS-8, "
Air
Bleeding Hydraulic System" .
2. Start engine. Run engine until oil temperature reaches 50 to
80°C (122 to 176°F).
CAUTION:

Leave the valve of the hydraulic pressure gauge [SST]
fully open while starting and running engine. If engine is
started with the valve closed, the hydraulic pressure in
oil pump goes up to the relief pressure along with
unusual increase of oil temperature.

Be sure to keep hose clear of belts and other parts when
engine is started.
3. Fully close the hydraulic pressure gauge [SST] valve with
engine at idle and measure the relief oil pressure.
CAUTION:
Never keep valve closed for 10 seconds or longer.
4. Open the valve slowly after measuring. Repair oil pump if the
relief oil pressure is outside the standard. Refer to PS-31, "
Dis-
assembly and Assembly (Models with VK45DE)" , PS-35, "Disassembly and Assembly (Models with
VQ35DE)" .
5. After inspection, disconnect the hydraulic pressure gauge [SST] from hydraulic circuit, then add fluid and
bleed air. Refer to PS-8, "
Air Bleeding Hydraulic System" .
Removal and InstallationNGS000DF
REMOVAL
1. Drain power steering fluid from reservoir tank.
2. Remove undercover from vehicle with a power tool.
3. Loosen drive belt. Refer to EM-16, "
DRIVE BELTS" (VQ35DE), EM-174, "DRIVE BELTS" (VK45DE).
4. Remove drive belt from oil pump pulley.
5. Remove piping of high pressure and low pressure (drain fluid from their pipings). Refer to PS-39,
"HYDRAULIC LINE" .
6. Remove power steering oil pump mounting bolts, and then remove power steering oil pump. Refer to PS-
39, "Removal and Installation" .
INSTALLATION
Installation is the reverse order of removal. For tightening torque, refer to PS-39, "HYDRAULIC LINE" .

Perform the following procedure after installing.
–Adjust belt tension (VQ35DE). Refer to EM-16, "Tension Adjustment" .
–About the installation of VK45DE drive belt, refer to EM-174, "Tension Adjustment" .
–Bleed air. Refer to PS-8, "Air Bleeding Hydraulic System" . Relief oil pressure:
8,520 - 9,320 kpa (86.9 - 95.1 kg/cm
2 , 1,235 - 1,351 psi)
SGIA0915E