2007 INFINITI M35 brake

BRC-2Revision: 2007 April2007 M35/M45 INSPECTION PROCEDURE ............................... 39
Pressure Sensor Circuit .......................................... 40
INSPECTION PROCEDURE ............................... 40
Steering Angle Sensor Circuit ................................. 41
INSPECTION PROCEDURE ............................... 41
Stop Lamp Switch Circuit ........................................ 43
INSPECTION PROCEDURE ............................... 43
Yaw Rate/Side G Sensor Circuit ............................. 44
INSPECTION PROCEDURE ............................... 44
Brake Fluid Level Switch Circuit ............................. 46
INSPECTION PROCEDURE ............................... 46
RAS Control Unit Circuit (With RAS) ...................... 47
INSPECTION PROCEDURE ............................... 47
ICC Sensor Integrated Unit Circuit (With ICC) ........ 48
INSPECTION PROCEDURE ............................... 48
CAN Communication Circuit ................................... 48
INSPECTION PROCEDURE ............................... 48
VDC OFF Switch Circuit ......................................... 49
INSPECTION PROCEDURE ............................... 49
Parking Brake Switch Circuit .................................. 50
INSPECTION PROCEDURE ............................... 50
Warning Lamp and Indicator Lamp Circuit ............. 50
INSPECTION PROCEDURE ............................... 50
TROUBLE DIAGNOSIS FOR SYMPTOMS .............. 51
Excessive ABS Function Operation Frequency ...... 51
Unexpected Pedal Reaction ................................... 51The Braking Distance Is Long ................................. 52
ABS Function Does Not Operate ............................ 52
Pedal Vibration or ABS Operation Sound Occurs ... 52
Vehicle Jerks During VDC/TCS/ABS Control .......... 53
WHEEL SENSOR ...................................................... 54
Removal and Installation ......................................... 54
COMPONENT ...................................................... 54
REMOVAL ............................................................ 54
INSTALLATION .................................................... 54
SENSOR ROTOR ...................................................... 56
Removal and Installation ......................................... 56
REMOVAL ............................................................ 56
INSTALLATION .................................................... 56
ACTUATOR AND ELECTRIC UNIT (ASSEMBLY) ... 57
Removal and Installation ......................................... 57
COMPONENT ...................................................... 57
REMOVAL ............................................................ 57
INSTALLATION .................................................... 58
G-SENSOR ................................................................ 59
Removal and Installation ......................................... 59
REMOVAL ............................................................ 59
INSTALLATION .................................................... 59
STEERING ANGLE SENSOR ................................... 60
Removal and Installation ......................................... 60
REMOVAL ............................................................ 60
INSTALLATION .................................................... 60

PRECAUTIONS
BRC-3
[VDC/TCS/ABS]
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Revision: 2007 April2007 M35/M45
[VDC/TCS/ABS]PRECAUTIONSPFP:00001
Precautions for Supplemental Restraint System (SRS) “AIR BAG” and “SEAT
BELT PRE-TENSIONER”
NFS000PY
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 for Procedures without Cowl Top CoverNFS000PZ
When performing the procedure after removing cowl top cover, cover
the lower end of windshield with urethane, etc.
Precautions for Brake SystemNFS000Q0

Recommended fluid is brake fluid “DOT 3”. Refer to MA-12, "RECOMMENDED FLUIDS AND LUBRI-
CANTS" .

Do not reuse drained brake fluid.

Be careful not to splash brake fluid on painted surface of body. If brake fluid is splashed on painted sur-
faces of body immediately wipe off then with cloth and then wash it away with water.

Do not use mineral oils such as gasoline or kerosene. They will ruin rubber parts of the hydraulic system.

Use a flare nut wrench when removing flare nuts, and use a flare
nut crowfoot and torque wrench when tighten brake tube flare
nuts.

When installing brake tubes, be sure to check torque.

Brake system is an important safety part. If a brake fluid leak is
detected, always disassemble the affected part. If a malfunction
is detected, replace part with a new one.

Before working, turn ignition switch OFF and disconnect con-
nectors of ABS actuator and electric unit (control unit) or battery
negative terminal.
WARNING:
Clean brake pads and shoes with a waste cloth, then wipe with a dust collector.
PIIB3706J
SBR686C

BRC-4
[VDC/TCS/ABS]
PRECAUTIONS
Revision: 2007 April2007 M35/M45
Precautions for Brake ControlNFS000Q1

Just after starting vehicle after ignition switch ON, brake pedal may vibrate or motor operating noise may
be heard from engine compartment. This is normal condition.

When an error is indicated by ABS or another warning lamp, collect all necessary information from cus-
tomer (what symptoms are present under what conditions) and check for simple causes before starting
diagnostic servicing. Besides electrical system inspection, check brake booster operation, brake fluid
level, and oil leaks.

If tire size and type are used in an improper combination, or brake pads are not Genuine NISSAN parts,
stopping distance or steering stability may deteriorate.

ABS might be out of order or malfunctions by putting a radio (wiring inclusive), an antenna and a lead-in
wire near the control unit.

If aftermarket parts (car stereo, CD player, etc.) have been installed, check for incidents such as harness
pinches, open circuits, and improper wiring.

VDC system may not operate normally or a VDC OFF indicator lamp or SLIP indicator lamp may light.
–When replacing the following parts with parts other than genuine parts or making modifications: Suspen-
sion-related parts (shock absorber, spring, bushing, etc.), tires, wheels (other than specified sizes), brake-
related parts (pad, rotor, caliper, etc.), engine-related parts (muffler, ECM, etc.) and body reinforcement-
related parts (roll bar, tower bar, etc.).
–When driving with worn or deteriorated suspension, tires and brake-related parts.

PREPARATION
BRC-5
[VDC/TCS/ABS]
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Revision: 2007 April2007 M35/M45
PREPARATIONPFP:00002
Special Service ToolsNFS000Q2
The actual shapes of Kent-Moore tools may differ from those of special service tools illustrated here.
Commercial Service ToolsNFS000Q3
Tool number
(Kent-Moore No.)
Tool nameDescription
ST30720000
(J-25405)
Drift
a: 77 mm (3.03 in) dia.
b: 55.5 mm (2.19 in) dia.
Installing rear sensor rotor ST27863000
(—)
Drift
a: 74.5 mm (2.93 in) dia.
b: 62.5 mm (2.46 in) dia.
KV40104710
(—)
a: 76.3 mm (3.00 in) dia.
b: 67.9 mm (2.67 in) dia.
ZZA0701D
ZZA0832D
ZZA0832D
Tool nameDescription
1. Flare nut crowfoot
a: 10 mm (0.39 in) / 12mm (0.47 in)
2. Torque wrenchInstalling brake tube
S-NT360

SYSTEM DESCRIPTION
BRC-7
[VDC/TCS/ABS]
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Revision: 2007 April2007 M35/M45
SYSTEM DESCRIPTIONPFP:00000
System DiagramNFS000Q5
FunctionsNFS000Q6
ABS

Anti-Lock Brake System is a function that detects wheel revolution while braking, electronically controls
braking force, and prevents wheel locking during sudden braking. It improves handling stability and
maneuverability for avoiding obstacles.

Electrical system diagnosis by CONSULT-II is available.
EBD

Electronic Brake force Distribution is a following function. ABS actuator and electric unit (control unit)
detects subtle slippages between the front and rear wheels during braking. Then it electronically controls
the rear braking force (brake fluid pressure) to reducing and reduces rear wheel slippage. Accordingly it
improves vehicle stability.

Electrical system diagnosis by CONSULT-II is available.
1. Electric line 2. Brake hydraulic line 3. ECM
4. TCM 5. Steering angle sensor 6. Warning lamp, indicator lamp
(combination meter)
7. AWD control unit
(AWD models)8. ICC sensor integrated unit
(with ICC)9. RAS control unit
(with RAS)
10. Injector operation signal 11. CAN communication 12. Front RH wheel sensor
13. Front LH wheel sensor 14. Master cylinder 15. ABS actuator and electric unit (con-
trol unit)
16. VDC OFF switch 17. Yaw rate/side G sensor 18. Rear RH wheel sensor
19. Rear LH wheel sensor
SFIA2722J

BRC-8
[VDC/TCS/ABS]
SYSTEM DESCRIPTION
Revision: 2007 April2007 M35/M45
TCS

Traction Control System is a function that electronically controls engine torque, brake fluid pressure and
A/T gear position to ensure the optimum slippage ratio at drive wheels by computing wheel speed signals
from 4 wheel sensors. When ABS actuator and electric unit (control unit) detects a spin at drive wheels
(rear wheels), it compares wheel speed signals from all 4 wheels. At this time, LH and RH rear brake fluid
pressure are controlled, while fuel being cut to engine and throttle valve being closed to reduce engine
torque by the control unit. Further more, throttle position is continuously controlled to ensure the optimum
engine torque at all times.

During TCS operation, it informs driver of system operation by flashing SLIP indicator lamp.

Electrical system diagnosis by CONSULT-II is available.
VDC

Vehicle Dynamics Control system detects driver's steering operation amount and brake pedal travel from
steering angle sensor and pressure sensor. Using information from yaw rate/side G sensor and wheel
sensor, VDC judges driving condition (conditions of under steer and over steer) to improve vehicle driving
stability by controlling brake application to 4 wheels and engine output.

During VDC operation, it informs driver of system operation by flashing SLIP indicator lamp.

Electrical system diagnosis by CONSULT-II is available.
ECD
Receives deceleration degree commandment value signal from ICC sensor integrated unit, and controls brake
fluid pressure with the motor [built-in ABS actuator and electric unit (control unit)].
Operation That Is Not "System Error" NFS000Q7
ABS

When starting engine or just after starting vehicle, brake pedal may vibrate or the motor operating sound
may be heard from engine room. This is a normal states of the operation check.

During ABS operation, brake pedal lightly vibrates and a mechanical sound may be heard. This is normal.

Stopping distance may be longer than that of vehicles without ABS when vehicle drives on rough, gravel,
or snow-covered (fresh, deep snow) roads.
TCS

Depending on road circumstances, driver may have a sluggish feel. This is normal, because optimum
traction has highest priority under TCS operation.

When vehicle is passing through a road where surface friction varies, downshifting or depressing acceler-
ator pedal fully may activate TCS temporarily.
VDC

During VDC operation, body and brake pedal lightly vibrate and mechanical sounds may be heard. This is
normal.

If vehicle is rotated on turn table, or rolled and rocked on ship, ABS warning lamp, VDC OFF indicator
lamp, and SLIP indicator lamp may turn on. In this case, start engine on normal road again. If ABS warn-
ing lamp, VDC OFF indicator lamp, and SLIP indicator lamp turn off after restart, it is normal.

When starting TCS or VDC under rapid acceleration or hard turn, operating sound by brake pedal is gen-
erated. However, this is not malfunction. This is because TCS and VDC are functioning normally.

VDC may not operate normally or ABS warning lamp, VDC OFF indicator lamp and SLIP indicator lamp
may turn on when driving special roads with extremely steep slant (banks on circuit road and so on.) How-
ever, it is not malfunction when returning to a normal state after restarting the engine. In that case, be sure
to erase the memory of self-diagnosis. Refer to BRC-24, "
ERASE MEMORY" .

Yaw rate /side G sensor malfunction may occur under hard turn like spin turn, rapid acceleration turn, drift
run, etc., when VDC function is OFF (VDC OFF switch is turned on). It is not malfunction if it is possible to
return to a normal position after restarting engine. Then erase the memory of self-diagnosis. Refer to
BRC-24, "
ERASE MEMORY" .

VDC OFF indicator lamp and SLIP indicator lamp may simultaneously turn on when low tire pressure
warning lamp turns on. This is not a VDC system error but results from characteristic change of tires.

BRC-10
[VDC/TCS/ABS]
TROUBLE DIAGNOSIS
Revision: 2007 April2007 M35/M45
TROUBLE DIAGNOSISPFP:00004
Fail-Safe FunctionNFS000Q8
ABS, EBD SYSTEM
In the event there is a malfunction with the electrical system, the ABS warning lamp, VDC OFF indicator lamp,
and SLIP indicator lamp will turn on when it is the ABS that is malfunctioning, and the brake warning lamp,
ABS warning lamp, VDC OFF indicator lamp, and SLIP indicator lamp will turn on when it is the EBD that is
malfunctioning. At the same time, the VDC/TCS/ABS will be put in one of the following states by the fail-safe
function.

When the ABS malfunctions, only the EBD operates. The condition is the same as that of models without
VDC/TCS/ABS.
NOTE:
ABS self-diagnosis sound may be heard. This is normal condition because a self-diagnosis for “Ignition
switch ON” and “The first starting” are being performed.

When the EBD malfunctions, the EBD and ABS will not operate. The condition is the same as that of mod-
els without VDC/TCS/ABS and EBD.
VDC/TCS
In case of VDC/TCS system malfunction, the VDC OFF indicator lamp and SLIP indicator lamp or only VDC
OFF indicator lamp are turned on, and the condition of the vehicle is the same as the condition of vehicles
without VDC/TCS equipment. In case of electrical malfunction with the VDC/TCS system, the ABS control
continues to operate normally even though VDC/TCS does not operate.
CAUTION:
If the Fail-Safe function is activated, then perform self-diagnosis for VDC/TCS/ABS control system.
How to Perform Trouble DiagnosesNFS000QB
BASIC CONCEPT

The most important point to perform trouble diagnosis is to understand systems (control and mechanism)
in vehicle thoroughly.

It is also important to clarify customer complaints before inspec-
tion.
First of all, reproduce symptom, and understand it fully.
Ask customer about his/her complaints carefully. In some cases,
they will be necessary to check symptom by driving vehicle with
customer.
CAUTION:
Customers are not professionals. Do not assume “maybe
customer means...” or “maybe customer mentioned this
symptom”.

It is essential to check symptoms right from beginning in order to
repair a malfunction completely.
For an intermittent malfunction, it is important to reproduce
symptom based on interview with customer and past examples.
Do not perform inspection on ad hoc basis. Most intermittent
malfunctions are caused by poor contacts. In this case, it will be
effective to shake suspected harness or connector by hand.
When repairs are performed without any symptom check, no
one can judge if malfunction has actually been eliminated.

After diagnostic, make sure to perform “ERASE MEMORY”.
Refer to BRC-24, "
ERASE MEMORY" .

Always read “GI General Information” to confirm general precau-
tions. Refer to GI-4, "
General Precautions" .
SEF234G
SEF233G

TROUBLE DIAGNOSIS
BRC-21
[VDC/TCS/ABS]
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Revision: 2007 April2007 M35/M45
Control Unit Input/Output Signal StandardNFS000RH
REFERENCE VALUE FROM CONSULT-II
CAUTION:
The display shows ABS actuator and electric unit (control unit) calculation data, so a normal value
might be displayed even in the event the output circuit (harness) is open or short-circuited.
Monitor item Display contentData monitor
ConditionReference value in nor-
mal operation
FR LH SENSOR
FR RH SENSOR
RR LH SENSOR
RR RH SENSORWheel speedVehicle stopped 0 [km/h (MPH)]
Vehicle running (Note 1)Nearly matches the
speedometer display
(± 10 % or less)
STOP LAMP SW Brake pedal operationWhen brake pedal is depressed ON
When brake pedal is not depressed OFF
BATTERY VOLTBattery voltage supplied to the ABS
actuator and electric unit (control unit)Ignition switch ON 10 – 16 V
GEAR Gear position determined by TCM1st gear
2nd gear
3rd gear
4th gear
5th gear1
2
3
4
5
SLCT LVR POSI A/T select lever positionP position
R position
N position
D positionP
R
N
D
OFF SW VDC OFF switchVDC OFF switch :ON
(When VDC OFF indicator lamp is ON)ON
VDC OFF switch :OFF
(When VDC OFF indicator lamp is OFF)OFF
YAW RATE SENYaw rate detected by yaw rate/side G
sensorWhen vehicle stop Approx. 0 d/s
When vehicle turning (–75 to 75 d/s)
4WD MODE MON
(Note 2)AWD activated Engine running AUTO
ACCEL POS SIG Throttle actuator opening/closing is dis-
played (linked with accelerator pedal)Accelerator pedal not depressed
(Engine stopped)0 %
Depress accelerator pedal
(Engine stopped)0 - 100 %
SIDE G-SENSOR Transverse G detected by side G sensorVehicle stopped
Approx. 0 m/s
2
Vehicle turning rightNegative value
(m/s2 )
Vehicle turning leftPositive value
(m/s
2 )
STR ANGLE SIGSteering angle detected by steering
angle sensorStraight-ahead Approx. 0°
Steering wheel turned –720 to 720°
PRESS SENSORBrake fluid pressure detected by pres-
sure sensorWith ignition switch turned ON and brake
pedal releasedApprox. 0 bar
With ignition switch turned ON and brake
pedal depressed–40 to 300 bar
ENGINE RPM Engine speedWith engine stopped 0 rpm
Engine runningAlmost in accordance
with tachometer display