2006 INFINITI M35 low oil pressure

ENGINE MAINTENANCE (VQ35DE ENGINE)
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Revision: 2006 January2006 M35/M45
ALTERNATOR AND POWER STEERING OIL PUMP BELT
1. Remove front engine undercover with power tool.
2. Loosen idler pulley lock nut (A) and adjust tension by turning
adjusting bolt (B).
For the specified belt tension, refer to EM-15, "Checking Drive
Belts" .
3. Tighten nut (A).
A/C COMPRESSOR BELT
1. Remove front engine undercover with power tool.
2. Loosen idler pulley lock nut (C) and adjust tension by turning adjusting bolt (D).
For the specified belt tension, refer to EM-15, "Checking Drive Belts" .
3. Tighten nut (C).
Changing Engine CoolantNLS0007J
WAR NING :
To avoid being scalded, do not change engine coolant when the engine is hot.
Wrap a thick cloth around radiator cap and carefully remove radiator cap. First, turn radiator cap a
quarter of a turn to release built-up pressure. Then turn radiator cap all the way.
Be careful not to allow engine coolant to contact drive belts.
DRAINING ENGINE COOLANT
1. Remove engine room cover (RH and LH). Refer to EM-14, "ENGINE ROOM COVER" .
2. Remove air duct (inlet). Refer to EM-17, "
AIR CLEANER AND AIR DUCT" .
3. Open radiator drain plug at the bottom of radiator, and then remove radiator cap. : 34.8 Nꞏm (3.5 kg-m, 26 ft-lb)
SBIA0532E
: 34.8 Nꞏm (3.5 kg-m, 26 ft-lb)
1 : Radiator drain plug hole
2 : Front engine under cover
: Engine front
PBIC3395E

MA-22
ENGINE MAINTENANCE (VK45DE ENGINE)
Revision: 2006 January2006 M35/M45
ENGINE MAINTENANCE (VK45DE ENGINE)PFP:10001
Checking Drive BeltsNLS0007Q
WAR NING :
Be sure to perform when the engine is stopped.
Remove air duct (inlet) when inspecting drive belt for alternator, water pump and A/C compressor.
Remove front engine undercover with power tool when inspecting power steering oil pump belt.
Make sure that indicator (single line notch) of each auto tensioner is within the allowable working range
(between three line notches).
NOTE:
Check auto tensioner indication when engine is cold.
When new drive belt is installed, the range should be “A”.
The indicator notch is located on the moving side of the tensioner for alternator, water pump and A/C
compressor belt, while it is found on the fixed side for power steering oil pump belt.
Visually check entire belt for wear, damage or cracks.
If the indicator is out of allowable working range or belt is damaged, replace belt.
Te n s i o n A d j u s t m e n tNLS0007R
Belt tensioning is not necessary, as it is automatically adjusted by auto tensioner.
Changing Engine CoolantNLS0007S
WAR NING :
To avoid being scalded, do not change engine coolant when engine is hot.
Wrap a thick cloth around radiator cap and carefully remove radiator cap. First, turn radiator cap a
quarter of a turn to release built-up pressure. Then turn radiator cap all the way.
Be careful not to allow engine coolant to contact drive belts.
DRAINING ENGINE COOLANT
1. Remove engine room cover (RH and LH) Refer to EM-173, "ENGINE ROOM COVER" .
2. Remove engine cover with power tool. Refer to EM-179, "
INTAKE MANIFOLD" .
3. Open radiator drain plug at the bottom of radiator, and then remove radiator cap.
PBIC3822E

PG-18
IPDM E/R (INTELLIGENT POWER DISTRIBUTION MODULE ENGINE ROOM)
Revision: 2006 January2006 M35/M45
IPDM E/R (INTELLIGENT POWER DISTRIBUTION MODULE ENGINE ROOM)
PFP:284B7
System DescriptionNKS004E2
IPDM E/R (Intelligent Power Distribution Module Engine Room) integrates the relay box and fuse block
which were originally placed in engine compartment. It controls integrated relay via IPDM E/R control cir-
cuit.
IPDM E/R-integrated control circuit performs ON-OFF operation of relay, CAN communication control and
oil pressure switch signal reception, etc.
It controls operation of each electrical part via ECM, BCM and CAN communication lines.
CAUTION:
None of the IPDM E/R-integrated relays can be removed.
SYSTEMS CONTROLLED BY IPDM E/R
1. Lamp control
Using CAN communication, it receives signal from BCM and controls the following lamps:
Headlamps (HI, LO)
Tail, parking and license plate lamps
Front fog lamps
2. Daytime light relay control (for Canada models)
Using CAN communication, it receives signals from BCM and controls the daytime light relay.
3. Wiper control
Using CAN communication, it receives signals from BCM and controls the front wipers.
4. Rear window defogger relay control
Using CAN communication, it receives signals from BCM and controls the rear window defogger relay.
5. A/C compressor control
Using CAN communication, it receives signals from ECM and controls the A/C relay.
6. Cooling fan control
Using CAN communication, it receives signals from ECM and controls cooling fan via cooling fan control
module.
7. Horn control
Using CAN communication, it receives signals from BCM and controls horn relay.
8. Starter motor relay control
Using CAN communication, it receives signals from BCM and controls starter motor relay.
9. Alternator control
Using CAN communication, it receives signal from ECM and controls power generation voltage.
CAN COMMUNICATION LINE CONTROL
With CAN communication, by connecting each control unit using two communication lines (CAN L-line, CAN
H-line), it is possible to transmit maximum amount of information with minimum wiring. Each control unit can
transmit and receive data, and reads necessary information only.
1. Fail-safe control
When CAN communication with other control units is impossible, IPDM E/R performs fail-safe control.
After CAN communication recovers normally, it also returns to normal control.
Operation of control parts by IPDM E/R during fail-safe mode is as follows:
Controlled system Fail-safe mode
Headlamps
With the ignition switch ON, the headlamp low relay is ON.
With the ignition switch OFF, the headlamp low relay is OFF.
Tail, parking and
license plate lamps
With the ignition switch ON, the tail lamp relay is ON.
With the ignition switch OFF, the tail lamp relay is OFF.
Cooling fan
With the ignition switch ON, the cooling fan HI operates.
With the ignition switch OFF, the cooling fan stops.
Front wiperUntil the ignition switch is turned off, the front wiper LO and HI remains in the same status it was in just
before fail
safe control was initiated.

PG-22
IPDM E/R (INTELLIGENT POWER DISTRIBUTION MODULE ENGINE ROOM)
Revision: 2006 January2006 M35/M45
DATA MONITOR
Operation Procedure
1. Touch “DATA MONITOR” on “SELECT MONITOR ITEM ” screen.
2. Touch “ALL SIGNALS”, “MAIN SIGNALS” or “SELECTION FROM MENU” on the “DATA MONITOR”
screen.
3. Touch the required monitoring item on “SELECTION FROM MENU”. In “ALL SIGNALS”, all items are
monitored. In “MAIN SIGNALS”, predetermined items are monitored.
4. Touch “START”.
5. Touch “RECORD” while monitoring to record the status of the item being monitored. To stop recording,
touch “STOP”.
All Signals, Main Signals, Selection From Menu
NOTE:
Perform monitoring of IPDM E/R data with the ignition switch ON. When the ignition switch is at ACC, the display may not be cor-
rect.
*1: Only the vehicle with day time light system operates. ALL SIGNALS All items will be monitored.
MAIN SIGNALS Monitor the predetermined item.
SELECTION FROM MENU Select any item for monitoring.
Item nameCONSULT-II
screen displayDisplay or unitMonitor item selection
Description
ALL
SIGNALSMAIN
SIGNALSSELECTION
FROM
MENU
Motor fan request MOTOR FAN REQ 1/2/3/4
Signal status input from ECM
A/C Compressor
requestAC COMP REQ ON/OFF
Signal status input from ECM
Tail & clearance
requestTAIL&CLR REQ ON/OFF
Signal status input from BCM
Headlamp LO
requestHL LO REQ ON/OFF
Signal status input from BCM
Headlamp HI
requestHL HI REQ ON/OFF
Signal status input from BCM
Front fog lamp
request FR FOG REQ ON/OFF
Signal status input from BCM
Front wiper request FR WIP REQSTOP/1LOW/
LOW/HI
Signal status input from BCM
Wiper auto stop WIP AUTO STOP ACT P/STOP P
Output status of IPDM E/R
Wiper protection WIP PROT OFF/BLOCK
Control status of IPDM E/R
Starter request ST RLY REQ ON/OFF
Signal status input from BCM
Ignition relay status IGN RLY ON/OFF
Ignition relay status monitored
with IPDM E/R
Rear window defog-
ger requestRR DEF REQ ON/OFF
Signal status input from BCM
Oil pressure switch OIL P SW OPEN/CLOSE
Signal status input in IPDM E/R
Daytime running
light requestDTRL REQ
*1ON/OFFSignal status input from BCM
Hood switch HOOD SW ON/OFF
Signal status input in IPDM E/R
Theft warning horn
requestTHFT HRN REQ ON/OFF
Signal status input from BCM
Horn chirp HORN CHIRP ON/OFF
Output status of IPDM E/R

PG-24
IPDM E/R (INTELLIGENT POWER DISTRIBUTION MODULE ENGINE ROOM)
Revision: 2006 January2006 M35/M45
Auto Active TestNKS004E7
DESCRIPTION
In auto active test mode, operation inspection can be performed when IPDM E/R sends a drive signal to the
following systems:
Rear window defogger
Front wiper (LO, HI)
Tail lamps, parking lamps and license plate lamps
Front fog lamps
Headlamps (LO, HI)
A/C compressor (magnetic clutch)
Cooling fan
Oil pressure warning lamp
OPERATION PROCEDURE
1. Close hood and front door (passenger side), and then lift wiper arms away from windshield (to prevent
glass damage by wiper operation).
NOTE:
When auto active test is performed with hood opened, sprinkle water on windshield beforehand.
2. Turn ignition switch OFF.
3. Turn ignition switch ON, and within 20 seconds, press driver's door switch 10 times (close other doors).
Then turn ignition switch OFF.
4. Turn ignition switch ON within 10 seconds after ignition switch OFF.
5. When auto active test mode is actuated, horn chirps once. Oil pressure warning lamp starts blinking.
6. After a series of operations is repeated three times, auto active test is completed.
NOTE:
When auto active test mode has to be cancelled halfway, turn ignition switch OFF.
CAUTION:
Never start the engine.
If the engine starting operation is made, delete DTC on the self-diag results of CONSULT-II.
Refer to BL-81, "
CONSULT-II Application Items" .
Be sure to inspect GW-52, "Door Switch Check" when the auto active test cannot be performed.

IPDM E/R (INTELLIGENT POWER DISTRIBUTION MODULE ENGINE ROOM)
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Revision: 2006 January2006 M35/M45
INSPECTION IN AUTO ACTIVE TEST MODE
When auto active test mode is actuated, the following eight steps are repeated three times.
(A): Oil pressure warning lamp is blinking when the auto active test operating.
Operation steps
PKIC0273E
Test item Operation time/ frequency
1 Rear window defogger 10 seconds
2 Front wiper LO 5 seconds
HI 5 seconds
3 Tail lamps, parking lamps, license plate lamps 10 seconds
4 Front fog lamps 10 seconds
5 Headlamp (LO) 10 seconds
6 Headlamp (HI) ON-OFF 5 times
7 A/C compressor (magnetic clutch) ON-OFF 5 times
8 Cooling fan LO 5 seconds
HI 5 seconds

PS-1
POWER STEERING SYSTEM
G STEERING
CONTENTS
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SECTION PS
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Revision: 2006 January2006 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 [SST] ..................................... 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 ...................... 17
POWER STEERING GEAR ...................................... 18
Removal and Installation ........................................ 18
COMPONENTS ................................................... 18
REMOVAL ........................................................
... 18
INSTALLATION ................................................... 19
INSPECTION AFTER INSTALLATION ................ 19
Disassembly and Assembly .................................
... 20
COMPONENTS ................................................... 20
DISASSEMBLY ................................................... 21
INSPECTION AFTER DISASSEMBLY ................ 22
ASSEMBLY ......................................................... 24
POWER STEERING OIL PUMP ............................... 29
On-Vehicle Inspection and Service ......................... 29
CHECKING RELIEF OIL PRESSURE ................ 29
Removal and Installation ........................................ 29
REMOVAL ........................................................
... 29
INSTALLATION ................................................... 29
Disassembly and Assembly (Models with VK45DE) ... 30
COMPONENTS ................................................... 30
INSPECTION BEFORE DISASSEMBLY ............. 30
DISASSEMBLY ................................................... 31
INSPECTION AFTER DISASSEMBLY ................ 31

PS-10
STEERING WHEEL
Revision: 2006 January2006 M35/M45
STEERING WHEELPFP:48430
On-Vehicle Inspection and ServiceNGS000D8
CHECKING CONDITION OF INSTALLATION
Check installation conditions of steering gear assembly, front suspension assembly, axle and steering col-
umn assembly.
Check if movement exists when steering wheel is moved up and down, to the left and right and to the axial
direction.
Check steering gear assembly mounting bolts and nut for looseness. Refer to PS-18, "COMPONENTS" .
CHECKING STEERING WHEEL PLAY
Turn steering wheel so that front wheels come to the straight-ahead position. Start engine and lightly turn
steering wheel to the left and right until front wheels start to move. Measure steering wheel movement on
the outer circumference.
When the measurement value is outside the standard value, check backlash for each joint of steering col-
umn assembly and installation condition of steering gear assembly.
CHECKING NEUTRAL POSITION STEERING WHEEL
Make sure that steering gear assembly, steering column assembly and steering wheel are installed in the
correct position.
Perform neutral position inspection after wheel alignment. Refer to FSU-6, "Wheel Alignment Inspection"
(2WD), FSU-23, "Wheel Alignment Inspection" (AWD).
Set vehicle to the straight-ahead position and confirm steering wheel is in the neutral position.
Loosen outer socket lock nut and turn inner socket to left and right equally to make fine adjustments if
steering wheel is not in the neutral position.
CHECKING STEERING WHEEL TURNING FORCE
1. Park vehicle on a level and dry surface, set parking brake.
2. Start engine.
3. Bring power steering fluid up to adequate operating temperature. [Make sure temperature of fluid is
approximately 50 to 80
C (122 to 176F).]
4. Check steering wheel turning force when steering wheel has
been turned 540
from neutral position.
NOTE:
Multiply the distance (L) from the hook of spring scale to the
center of steering wheel by the measurement value with a spring
scale.
5. If steering wheel turning force is out of the specification, check
rack sliding force and relief hydraulic pressure of oil pump.
Regarding relief hydraulic pressure of oil pump, refer to PS-29,
"CHECKING RELIEF OIL PRESSURE" .
a. Disconnect lower joint and steering knuckle from steering gear assembly. Refer to PS-13, "
COMPO-
NENTS" , FAX-5, "COMPONENT" .
b. Start and run engine at idle to make sure steering fluid has reached normal operating temperature. Steering wheel axial end play : 0 mm (0 in)
Steering wheel play : 0 - 35 mm (0 - 1.38 in)
Steering wheel turning
force: 7.45 Nꞏm (0.76 kg-m, 66 in-lb)
SGIA1025J