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BRC

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F BRAKES

SECTION
BRAKE CONTROL SYSTEM
BRC B

E
CONTENTS
VDC/TCS/ABS ABS WARNING LAMP, SLIP INDICATOR LAMP BRC
AND VDC OFF INDICATOR LAMP INSPECTION 24 ...
PRECAUTIONS ......................................................... 4
. For Fast and Accurate Diagnosis .......................... 25 .
Precautions for Supplemental Restraint System PRECAUTIONS FOR DIAGNOSIS .................... 25 . G
(SRS) "AIR BAG" and "SEAT BELT PRE-TEN- Warning Lamp and Indicator Timing ...................... 26 .
SIONER" ................................................................. 4
. Control Unit Input/Output Signal Standard ............ 26 .
Precautions for Brake System ................................. 4 . REFERENCE VALUE FROM CONSULT-II ........ 26 .
Precautions When Using CONSULT-II .................... 4 . H
CONSULT-II Function (ABS) ................................. 29 .
CHECK POINTS FOR USING CONSULT-II ........ 4 . CONSULT-II START PROCEDURE ................... 29 .
Precautions for Brake Control ................................. 5 . SELF-DIAGNOSIS ............................................. 29 .
Precautions for CAN System .................................. 6 . DATA MONITOR ................................................ 32 . I
PREPARATION .......................................................... 7
. ACTIVE TEST .................................................... 35 .
Special Service Tool ................................................ 7
. TROUBLE DIAGNOSIS FOR SELF-DIAGNOSTIC
Commercial Service Tools ....................................... 7 . ITEMS ....................................................................... 37
. J
SYSTEM DESCRIPTION ........................................... 8 . Wheel Sensor System Inspection .......................... 37 .
System Components ............................................... 8 . Engine System Inspection ..................................... 38 .
ABS Function .......................................................... 9
. ABS/TCS/VDC Control Unit Inspection ................. 39 .
EBD Function .......................................................... 9
. K
Steering Angle Sensor System .............................. 39 .
TCS Function .......................................................... 9
. Yaw Rate/Side/Decel G Sensor System Inspection 41 ...
VDC Function .......................................................... 9
. Solenoid and VDC Change-Over Valve System
Fail-Safe Function ................................................... 9
. Inspection .............................................................. 43
. L
ABS/EBD SYSTEM ............................................ 10 . Actuator Motor, Motor Relay, and Circuit Inspection 44 ...
VDC/TCS SYSTEM ............................................ 10 . Stop Lamp Switch System Inspection ................... 45 .
Hydraulic Circuit Diagram ..................................... 10 . ABS/TCS/VDC Control Unit Power and Ground M
CAN COMMUNICATION ..........................................11 . Systems Inspection ............................................... 46 .
System Description ................................................11
. Brake Fluid Level Sensor System Inspection ........ 47 .
TROUBLE DIAGNOSIS ........................................... 12 . Pressure Sensor System Inspection ..................... 47 .
How to Perform Trouble Diagnoses for Quick and Steering Angle Sensor Safe Mode Inspection ....... 48 .
Accurate Repair .................................................... 12
. CAN Communication System Inspection ............... 49 .
INTRODUCTION ................................................ 12 . Inspection For Self-diagnosis Result "ST ANGLE
WORK FLOW ..................................................... 13. SEN SIGNAL" ........................................................ 49 .
CLARIFY CONCERN ......................................... 14 . Inspection For Self-diagnosis Result "DECEL G
EXAMPLE OF DIAGNOSIS SHEET .................. 14 . SEN SET" .............................................................. 50
.
Component Parts and Harness Connector Location 15 ... VDC OFF Indicator lamp Does Not Illuminate ....... 50 .
Schematic ............................................................. 16
. Component Inspection ........................................... 50 .
Wiring Diagram -- VDC -- .................................... 17 . VDC OFF SWITCH ............................................ 50 .
Basic Inspection .................................................... 24
. TROUBLE DIAGNOSES FOR SYMPTOMS ........... 51 .
BRAKE FLUID LEVEL, FLUID LEAK, AND ABS Works Frequently .......................................... 51 .
BRAKE PAD INSPECTION ................................ 24 . Unexpected Pedal Action ...................................... 52 .
POWER SYSTEM TERMINAL LOOSENESS Long Stopping Distance ......................................... 53 .
AND BATTERY INSPECTION ........................... 24 .

Revision: September 2006 BRC-1 2007 Xterra
ABS Does Not Work .............................................. 53 . CAN COMMUNICATION ..........................................72 .
Pedal Vibration or ABS Operation Noise ............... 53 . System Description ................................................72 .
ABS Warning Lamp Does Not Come On When Igni- TROUBLE DIAGNOSIS ...........................................73 .
tion Switch Is Turned On ....................................... 54 . How to Perform Trouble Diagnoses for Quick and
ABS Warning Lamp Stays On When Ignition Switch Accurate Repair .....................................................73 .
Is Turned On .......................................................... 54 . INTRODUCTION ................................................73 .
Vehicle Jerks During TCS/VDC Activation ............. 55 . WORK FLOW .....................................................74 .
ON-VEHICLE SERVICE ........................................... 56 . CLARIFY CONCERN ..........................................75 .
Adjustment of Steering Angle Sensor Neutral Posi- EXAMPLE OF DIAGNOSIS SHEET ...................75 .
tion ......................................................................... 56
. Component Parts and Harness Connector Location ...76
WITH CONSULT-II ............................................. 56 . Schematic ..............................................................77
.
WITHOUT CONSULT-II ...................................... 56 . Wiring Diagram -- VDC -- ....................................78 .
Calibration of Decel G Sensor ............................... 56 . Basic Inspection .....................................................85.
WHEEL SENSORS .................................................. 58 . BRAKE FLUID LEVEL, FLUID LEAK, AND
Removal and Installation ....................................... 58 . BRAKE PAD INSPECTION .................................85 .
REMOVAL .......................................................... 58 . POWER SYSTEM TERMINAL LOOSENESS
INSTALLATION ................................................... 58 . AND BATTERY INSPECTION ............................85 .
SENSOR ROTOR ..................................................... 59 . ABS WARNING LAMP, SLIP INDICATOR LAMP,
Removal and Installation ....................................... 59 . VDC OFF INDICATOR LAMP AND HDC INDI-
FRONT ............................................................... 59. CATOR LAMP INSPECTION ..............................85 .
REAR .................................................................. 59
. For Fast and Accurate Diagnosis ...........................86 .
ACTUATOR AND ELECTRIC UNIT (ASSEMBLY) ... 60 PRECAUTIONS FOR DIAGNOSIS ....................86 .
Removal and Installation ....................................... 60 . Warning Lamp and Indicator Timing ......................87 .
REMOVAL .......................................................... 60 . Control Unit Input/Output Signal Standard .............87 .
INSTALLATION ................................................... 61 . REFERENCE VALUE FROM CONSULT-II .........87 .
STEERING ANGLE SENSOR .................................. 62 . CONSULT-II Function (ABS) ..................................91 .
Removal and Installation ....................................... 62 . CONSULT-II START PROCEDURE ....................91 .
G SENSOR ............................................................... 63 . SELF-DIAGNOSIS ..............................................91 .
Removal and Installation ....................................... 63 . DATA MONITOR .................................................94 .
REMOVAL .......................................................... 63 . ACTIVE TEST .....................................................97 .
INSTALLATION ................................................... 63 . TROUBLE DIAGNOSIS FOR SELF-DIAGNOSTIC
ITEMS ..................................................................... 100
.
HDC/HSA/VDC/TCS/ABS Wheel Sensor System Inspection ........................ 100 .
Engine System Inspection ................................... 101 .
PRECAUTIONS ........................................................ 64
. ABS/TCS/VDC Control Unit Inspection ................ 102 .
Precautions for Supplemental Restraint System Steering Angle Sensor System ............................ 102 .
(SRS) "AIR BAG" and "SEAT BELT PRE-TEN- Yaw Rate/Side/Decel G Sensor System Inspection.104
SIONER" ................................................................ 64
. Solenoid and VDC Change-Over Valve System
Precautions for Brake System ............................... 64 . Inspection ............................................................. 106
.
Precautions When Using CONSULT-II .................. 64 . Actuator Motor, Motor Relay, and Circuit Inspection.107
CHECK POINTS FOR USING CONSULT-II ....... 64 . Stop Lamp Switch System Inspection .................. 108 .
Precautions for Brake Control ............................... 65 . ABS/TCS/VDC Control Unit Power and Ground
Precautions for CAN System ................................. 66 . Systems Inspection .............................................. 109 .
PREPARATION ........................................................ 67
. Brake Fluid Level Sensor System Inspection ...... 110 .
Special Service Tool .............................................. 67
. Active Booster System Inspection ....................... 111 .
Commercial Service Tools ..................................... 67 . Pressure Sensor System Inspection .................... 112 .
SYSTEM DESCRIPTION ......................................... 68 . Steering Angle Sensor Safe Mode Inspection ..... 115 .
System Components ............................................. 68 . CAN Communication System Inspection ............. 115 .
ABS Function ......................................................... 69
. Inspection For Self-diagnosis Result "ST ANGLE
EBD Function ........................................................ 69
. SEN SIGNAL" ...................................................... 116 .
TCS Function ......................................................... 69
. Inspection For Self-diagnosis Result "DECEL G
VDC Function ........................................................ 69
. SEN SET" ............................................................ 116
.
HDC Function ........................................................ 69
. VDC OFF Indicator lamp Does Not Illuminate ..... 116 .
HSA Function ........................................................ 70
. Component Inspection ......................................... 117 .
Fail-Safe Function ................................................. 70
. VDC OFF SWITCH ........................................... 117 .
ABS/EBD SYSTEM ............................................ 70 . HDC SWITCH ................................................... 117 .
HDC/HSA SYSTEM ............................................ 70 . TROUBLE DIAGNOSES FOR SYMPTOMS .......... 118 .
VDC/TCS SYSTEM ............................................ 70 . ABS Works Frequently ......................................... 118 .
Hydraulic Circuit Diagram ...................................... 71 . Unexpected Pedal Action ..................................... 119 .

Revision: September 2006 BRC-2 2007 Xterra
Long Stopping Distance ...................................... 120 . WHEEL SENSORS ................................................ 127 .
ABS Does Not Work ............................................ 120 . Removal and Installation ..................................... 127 . A
Pedal Vibration or ABS Operation Noise ............ 120 . REMOVAL ........................................................ 127
.
ABS Warning Lamp Does Not Come On When Igni- INSTALLATION ................................................ 127 .
tion Switch Is Turned On ..................................... 121 . SENSOR ROTOR .................................................. 128 . B
ABS Warning Lamp Stays On When Ignition Switch Removal and Installation ..................................... 128 .
Is Turned On ....................................................... 121 . FRONT ............................................................. 128
.
Vehicle Jerks During TCS/VDC Activation .......... 122 . REAR ............................................................... 128
.
Stop Lamp Relay Inspection ............................... 123 . ACTUATOR AND ELECTRIC UNIT (ASSEMBLY). 129 C
HDC Switch Inspection ....................................... 123 . Removal and Installation ..................................... 129 .
ON-VEHICLE SERVICE ........................................ 125 . REMOVAL ........................................................ 129
.
Adjustment of Steering Angle Sensor Neutral Posi- INSTALLATION ................................................ 130 . D
tion ...................................................................... 125
. STEERING ANGLE SENSOR ............................... 131 .
WITH CONSULT-II ........................................... 125 . Removal and Installation ..................................... 131 .
WITHOUT CONSULT-II ................................... 125 . G SENSOR ............................................................. 132
. E
Calibration of Decel G Sensor ............................. 125 . Removal and Installation ..................................... 132 .
REMOVAL ........................................................ 132
.
INSTALLATION ................................................ 132 .
BRC

Revision: September 2006 BRC-3 2007 Xterra
PRECAUTIONS
[VDC/TCS/ABS]
PRECAUTIONS PFP:00001

Precautions for Supplemental Restraint System (SRS) "AIR BAG" and "SEAT
BELT PRE-TENSIONER" EFS005U3

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:
G 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.
G 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.
G 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 Brake System EFS005HC

CAUTION:
G Refer to MA-11, "RECOMMENDED FLUIDS AND LUBRICANTS" for recommended brake fluid.
G Never reuse drained brake fluid.
G Be careful not to splash brake fluid on painted areas; it may cause paint damage. If brake fluid is
splashed on painted areas, wash it away with water immediately.
G To clean or wash all parts of master cylinder and disc brake caliper, use clean brake fluid.
G Never use mineral oils such as gasoline or kerosene. They will ruin rubber parts of the hydraulic
system.
G Use flare nut wrench when removing and installing brake
tube.
G If a brake fluid leak is found, the part must be disassembled
without fail. Then it has to be replaced with a new one if a
defect exists.
G Turn the ignition switch OFF and remove the connector of
the ABS actuator and electric unit (control unit) or the bat-
tery terminal before performing the work.
G Always torque brake lines when installing.
G Burnish the brake contact surfaces after refinishing or SBR686C
replacing rotors, after replacing pads, or if a soft pedal
occurs at very low mileage.
Refer to BR-27, "BRAKE BURNISHING PROCEDURE" (front disc brake) or BR-32, "BRAKE BUR-
NISHING PROCEDURE" (rear disc brake).
WARNING:
G Clean brake pads and shoes with a waste cloth, then wipe with a dust collector.
Precautions When Using CONSULT-II EFS005HD

When connecting CONSULT-II to data link connector, connect them through CONSULT-II CONVERTER.
CAUTION:
If CONSULT-II is used with no connection of CONSULT-II CONVERTER, malfunctions might be
detected in self-diagnosis depending on control unit which carries out CAN communication.
CHECK POINTS FOR USING CONSULT-II
1. Has CONSULT-II been used without connecting CONSULT-II CONVERTER on this vehicle?
G If YES, GO TO 2.

Revision: September 2006 BRC-4 2007 Xterra
PRECAUTIONS
[VDC/TCS/ABS]
G If NO, GO TO 5.
2. Is there any indication other than indications relating to CAN communication system in the self-diagnosis A
results?
G If YES, GO TO 3.

G If NO, GO TO 4. B
3. Based on self-diagnosis results unrelated to CAN communication, carry out the inspection.
4. Malfunctions may be detected in self-diagnosis depending on control units carrying out CAN communica-
tion. Therefor, erase the self-diagnosis results. C
5. Diagnose CAN communication system. Refer to LAN-7, "TROUBLE DIAGNOSIS" .
Precautions for Brake Control EFS005HE D
G During ABS operation, the brake pedal may vibrate lightly and a mechanical noise may be heard. This is
normal.
G Just after starting vehicle, the brake pedal may vibrate or a motor operating noise may be heard from E
engine compartment. This is a normal status of operation check.
G Stopping distance may be longer than that of vehicles without ABS when vehicle drives on rough, gravel,
or snow-covered (fresh, deep snow) roads. BRC
G 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
diagnosis. Besides electrical system inspection, check brake booster operation, brake fluid level, and fluid G
leaks.
G If incorrect tire sizes or types are installed on the vehicle or brake pads are not Genuine NISSAN parts,
stopping distance or steering stability may deteriorate. H
G If there is a radio, antenna or related wiring near control module, ABS function may have a malfunction or
error.
G If aftermarket parts (car stereo, CD player, etc.) have been installed, check for incidents such as harness I
pinches, open circuits or improper wiring.
G If the following components are replaced with non-genuine components or modified, the VDC OFF indica-
tor lamp and SLIP indicator lamp may turn on or the VDC system may not operate properly. Components
J
related to suspension (shock absorbers, struts, springs, bushings, etc.), tires, wheels (exclude specified
size), components related to brake system (pads, rotors, calipers, etc.), components related to engine
(muffler, ECM, etc.), components related to body reinforcement (roll bar, tower bar, etc.).
G Driving with broken or excessively worn suspension components, tires or brake system components may K
cause the VDC OFF indicator lamp and the SLIP indicator lamp to turn on, and the VDC system may not
operate properly.
G When the TCS or VDC is activated by sudden acceleration or sudden turn, some noise may occur. The L
noise is a result of the normal operation of the TCS and VDC.
G When driving on roads which have extreme slopes (such as mountainous roads) or high banks (such as
sharp curves on a freeway), the VDC may not operate normally, or the VDC warning lamp and the SLIP M
indicator lamp may turn on. This is not a problem if normal operation can be resumed after restarting the
engine.
G Sudden turns (such as spin turns, acceleration turns), drifting, etc. with VDC turned off may cause the yaw
rate/side/decel G sensor to indicate a problem. This is not a problem if normal operation can be resumed
after restarting the engine.
G If battery is removed or steering angle sensor is disconnected, power to steering angle sensor is lost and
the screen goes into steering angle sensor safe mode.
G When screen goes into steering angle sensor safe mode, perform "Adjustment of Steering Angle Sensor
Neutral Position" with CONSULT-II and check that VDC OFF indicator turns off. Additionally, perform self-
diagnosis, check that only "Steering Angle Sensor Safe Mode" is shown for self-diagnostic result, and
then delete the memory. (If the self-diagnostic result shows an indication other than "Steering Angle Sen-
sor Safe Mode", repair the relevant part and restart self-diagnosis.) The steering angle sensor is released
and returns to normal condition by performing the above operation.
G When checking, if only "Steering Angle Sensor Safe Mode" is shown in the self-diagnostic result and VDC
OFF indicator is off, delete history of malfunction. This happens when battery power supply is lost and the
screen goes into Steering Angle Sensor Safe Mode, and then screen returns to normal mode automati-

Revision: September 2006 BRC-5 2007 Xterra
PRECAUTIONS
[VDC/TCS/ABS]
cally by driving the vehicle in a straight forward direction [for approximately 30 seconds at 20 km/h (12
MPH) or more] after power is supplied again.
NOTE:
VDC OFF indicator lamp is on when VDC OFF switch is on.
Precautions for CAN System EFS005HF

G Do not apply voltage of 7.0V or higher to terminal to be measured.
G Maximum open terminal voltage of tester in use must be less than 7.0V.
G Before checking harnesses, turn ignition switch OFF and disconnect battery negative cable.
G Area to be repaired must be soldered and wrapped with tape.
Make sure that fraying of twisted wire is within 110 mm (4.33 in).

PKIA0306E

G Do not make a bypass connection to repaired area. (If the circuit
is bypassed, characteristics of twisted wire will be lost.)

PKIA0307E

Revision: September 2006 BRC-6 2007 Xterra
PREPARATION
[VDC/TCS/ABS]
PREPARATION PFP:00002
A
Special Service Tool EFS005HH

The actual shapes of Kent-Moore tools may differ from those of special service tools illustrated here.
Tool number Description B
(Kent-Moore No.)
Tool name
-- Checking operation of ABS active wheel C
(J-45741) sensors
ABS active wheel sensor tester

WFIA0101E
E
ST30031000 Removing sensor rotor
( -- )
Bearing puller
BRC

ZZA0700D G

Commercial Service Tools EFS005HI

Tool name Description H
1. Flare nut crowfoot Removing and installing brake piping
2. Torque wrench a: 10 mm (0.39 in)/12 mm (0.47 in)
I

J
S-NT360

Revision: September 2006 BRC-7 2007 Xterra
SYSTEM DESCRIPTION
[VDC/TCS/ABS]
SYSTEM DESCRIPTION PFP:00000

System Components EFS005HJ

WFIA0356E

Revision: September 2006 BRC-8 2007 Xterra
SYSTEM DESCRIPTION
[VDC/TCS/ABS]
ABS Function EFS005HK

A
G The Anti-Lock Brake System detects wheel revolution while braking and improves handling stability during
sudden braking by electrically preventing wheel lockup. Maneuverability is also improved for avoiding
obstacles.
G If the electrical system malfunctions, the Fail-Safe function is activated, the ABS becomes inoperative and B
the ABS warning lamp turns on.
G The electrical system can be diagnosed using CONSULT-II.
C
G During ABS operation, the brake pedal may vibrate lightly and a mechanical noise may be heard. This is
normal.
G Just after starting the vehicle, the brake pedal may vibrate or a motor operating noise may be heard from
engine compartment. This is a normal status of operation check. D
G Stopping distance may be longer than that of vehicles without ABS when vehicle drives on rough, gravel,
or snow-covered (fresh, deep snow) roads.
E
EBD Function EFS005HL

G Electronic Brake Distribution is a function that detects subtle slippages between the front and rear wheels
during braking, and it improves handling stability by electronically controlling the brake fluid pressure BRC
which results in reduced rear wheel slippage.
G If the electrical system malfunctions, the Fail-Safe function is activated, the EBD and ABS become inoper-
ative, and the ABS warning lamp and brake warning lamp are turned on. G
G The electrical system can be diagnosed using CONSULT-II.
G During EBD operation, the brake pedal may vibrate lightly and a mechanical noise may be heard. This is
normal. H
G Just after starting the vehicle, the brake pedal may vibrate or a motor operating noise may be heard from
engine compartment. This is a normal status of operation check.
TCS Function EFS005HM I
G Spinning of the drive wheels is detected by the ABS actuator and electric unit (control unit) using inputs
from the wheel speed sensors. If wheel spin occurs, the drive wheel right and left brake fluid pressure
control and engine fuel cut are activated while the throttle value is restricted to reduce the engine torque J
and decrease the amount of wheel spin. In addition, the throttle opening is controlled to achieve the opti-
mum engine torque.
G Depending on road condition, the vehicle may have a sluggish feel. This is normal, because optimum trac- K
tion has the highest priority during TCS operation.
G TCS may be activated during sudden vehicle acceleration, wide open throttle acceleration, sudden trans-
mission shifts or when the vehicle is driven on a road with a varying surface friction coefficient. L
G The SLIP indicator lamp flashes to inform the driver of TCS operation.
VDC Function EFS005HN
M
G In addition to the ABS/TCS function, the driver steering amount and brake operation amount are detected
from the steering angle sensor and pressure sensors, and the vehicle's driving status (amount of under
steering/over steering) is determined using inputs from the yaw rate sensor/side G sensor, wheel speed
sensors, etc. and this information is used to improve vehicle stability by controlling the braking and engine
torque application to the wheels.
G The SLIP indicator lamp flashes to inform the driver of VDC operation.
G During VDC operation, the vehicle body and brake pedal may vibrate lightly and a mechanical noise may
be heard. This is normal.
G The VDC OFF indicator lamp and SLIP indicator lamp may turn on when the vehicle is subject to strong
shaking or large vibration, such as when the vehicle is on a turntable or a ship while the engine is running
or on a steep slope. In this case, restart the engine on a normal road and if the VDC OFF indicator lamp
and SLIP indicator lamp turn off, there is no problem.
Fail-Safe Function EFS005HO

CAUTION:
If the Fail-Safe function is activated, perform the Self Diagnosis for ABS/TCS/VDC system.

Revision: September 2006 BRC-9 2007 Xterra
SYSTEM DESCRIPTION
[VDC/TCS/ABS]
ABS/EBD SYSTEM
In case of an electrical malfunction with the ABS, the ABS warning lamp, VDC OFF indicator lamp and SLIP
indicator lamp will turn on. In case of an electrical malfunction with the EBD system, the BRAKE warning lamp,
ABS warning lamp, VDC OFF indicator lamp and SLIP indicator lamp will turn on.
The system will revert to one of the following conditions of the Fail-Safe function.
1. For ABS malfunction, only the EBD is operative and the condition of the vehicle is the same condition of
vehicles without ABS/TCS/VDC system.
2. For EBD malfunction, the EBD and ABS become inoperative, and the condition of the vehicle is the same
as the condition of vehicles without ABS/TCS/VDC or EBD system.
VDC/TCS SYSTEM
In case of TCS/VDC system malfunction, the VDC OFF indicator lamp and SLIP indicator lamp are turned on
and the condition of the vehicle is the same as the condition of vehicles without TCS/VDC system. In case of
an electrical malfunction with the TCS/VDC system, the ABS control continues to operate normally without
TCS/VDC control.
Hydraulic Circuit Diagram EFS005HP

WFIA0357E

Revision: September 2006 BRC-10 2007 Xterra
CAN COMMUNICATION
[VDC/TCS/ABS]
CAN COMMUNICATION PFP:23710
A
System Description EFS005HQ

Refer to LAN-4, "SYSTEM DESCRIPTION" .
B

BRC

Revision: September 2006 BRC-11 2007 Xterra
TROUBLE DIAGNOSIS
[VDC/TCS/ABS]
TROUBLE DIAGNOSIS PFP:00000

How to Perform Trouble Diagnoses for Quick and Accurate Repair EFS005HR

INTRODUCTION
The ABS/TCS/VDC system has an electronic control unit to control
major functions. The control unit accepts input signals from sensors
and controls actuator operation. It is also important to check for con-
ventional malfunctions such as air leaks in the booster or lines, lack
of brake fluid, or other malfunctions with the brake system.
It is much more difficult to diagnose a malfunction that occurs inter-
mittently rather than continuously. Most intermittent malfunctions are
caused by poor electrical connections or wiring. In this case, careful
checking of suspicious circuits may help prevent the replacement of
good parts.
A visual check only may not find the cause of the malfunction, so a
SEF233G
road test should be performed.
Before undertaking actual checks, take just a few minutes to talk with
a customer who approaches with a ABS/TCS/VDC complaint. The
customer is a very good source of information, especially for inter-
mittent ones. Through the talks with the customer, find out what
symptoms are present and under what conditions they occur.
Start your diagnosis by looking for "conventional" malfunctions first.
This is one of the best ways to troubleshoot brake malfunctions on
an ABS/TCS/VDC equipped vehicle. Also check related Service Bul-
letins for information.

SEF234G

Revision: September 2006 BRC-12 2007 Xterra
TROUBLE DIAGNOSIS
[VDC/TCS/ABS]
WORK FLOW
A

BRC

WFIA0534E

Revision: September 2006 BRC-13 2007 Xterra
TROUBLE DIAGNOSIS
[VDC/TCS/ABS]
CLARIFY CONCERN
G A customer's description of a vehicle concern may vary depend-
ing on the individual. It is important to clarify the customer's con-
cern.
G Ask the customer about what symptoms are present under what
conditions. Use this information to reproduce the symptom while
driving.
G It is also important to use the diagnosis sheet to understand
what type of trouble the customer is having.

SBR339B

EXAMPLE OF DIAGNOSIS SHEET

WFIA0097E

Revision: September 2006 BRC-14 2007 Xterra
TROUBLE DIAGNOSIS
[VDC/TCS/ABS]
Component Parts and Harness Connector Location EFS005HS

BRC

WFIA0401E

Revision: September 2006 BRC-15 2007 Xterra
TROUBLE DIAGNOSIS
[VDC/TCS/ABS]
Schematic EFS005HT

WFWA0387E

Revision: September 2006 BRC-16 2007 Xterra
TROUBLE DIAGNOSIS
[VDC/TCS/ABS]
Wiring Diagram -- VDC -- EFS005HU

BRC

WFWA0388E

Revision: September 2006 BRC-17 2007 Xterra
TROUBLE DIAGNOSIS
[VDC/TCS/ABS]

WFWA0389E

Revision: September 2006 BRC-18 2007 Xterra
TROUBLE DIAGNOSIS
[VDC/TCS/ABS]

BRC

WFWA0242E

Revision: September 2006 BRC-19 2007 Xterra
TROUBLE DIAGNOSIS
[VDC/TCS/ABS]

WFWA0390E

Revision: September 2006 BRC-20 2007 Xterra
TROUBLE DIAGNOSIS
[VDC/TCS/ABS]

BRC

WFWA0391E

Revision: September 2006 BRC-21 2007 Xterra
TROUBLE DIAGNOSIS
[VDC/TCS/ABS]

WFWA0392E

Revision: September 2006 BRC-22 2007 Xterra
TROUBLE DIAGNOSIS
[VDC/TCS/ABS]

BRC

WFWA0393E

Revision: September 2006 BRC-23 2007 Xterra
TROUBLE DIAGNOSIS
[VDC/TCS/ABS]
Basic Inspection EFS005HV

BRAKE FLUID LEVEL, FLUID LEAK, AND BRAKE PAD INSPECTION
1. Check fluid level in the brake fluid reservoir. If fluid level is low, add fluid.
2. Check the brake piping and around the ABS actuator and electric unit (control unit) for leaks. If there is
leaking or seeping fluid, check the following items.
G If ABS actuator and electric unit (control unit) connection is loose, tighten the piping to the specified
torque and recheck for leaks.
G If there is damage to the connection flare nut or ABS actuator and electric unit (control unit) threads,
replace the damaged part and recheck for leaks.
G When there is fluid leaking or seeping from a fluid connection, use a clean cloth to wipe off the fluid and
recheck for leaks. If fluid is still seeping out, replace the damaged part. If the fluid is leaking at the ABS
actuator and electric unit (control unit), replace the ABS actuator and electric unit (control unit) assem-
bly.
CAUTION:
The ABS actuator and electric unit (control unit) cannot be disassembled and must be replaced
as an assembly.
3. Check the brake pads for excessive wear.
POWER SYSTEM TERMINAL LOOSENESS AND BATTERY INSPECTION
Make sure the battery positive cable, negative cable and ground connection are not loose. In addition, make
sure the battery is sufficiently charged.
ABS WARNING LAMP, SLIP INDICATOR LAMP AND VDC OFF INDICATOR LAMP INSPECTION
1. Make sure ABS warning lamp, SLIP indicator lamp and VDC OFF indicator lamp (when VDC OFF switch
is off), turn on for approximately 2 seconds when the ignition switch is turned ON. If they do not, check the
ABS warning lamp, SLIP indicator lamp and VDC OFF indicator lamp. Check CAN communications. If
there are no errors with the CAN communication system, replace combination meter. Refer to DI-23,
"Removal and Installation" .
2. Make sure the lamps turn off approximately 2 seconds after the ignition switch is turned ON. If the lamp
does not turn off, conduct self-diagnosis of ABS actuator and electric unit (control unit). If no malfunctions
are detected in self-diagnosis, replace combination meter. Refer to DI-23, "Removal and Installation" .
NOTE:
G On 4WD vehicles, when the transfer case is placed in 4LO, the VDC system is disabled and the VDC
indicator will turn on.
G If the battery has been disconnected, the TCS/VDC system is initialized and the SLIP and VDC OFF
indicator lamps may not turn off after 2 seconds when the ignition switch is turned ON. In this case,
refer to BRC-29, "SELF-DIAGNOSIS" .
3. With the engine running, make sure the VDC OFF indicator lamp turns on and off when the VDC OFF
switch is turned on and off. If the indicator lamp status does not correspond to switch operation, check the
VDC OFF switch. Refer to BRC-50, "VDC OFF SWITCH" .
4. After conducting the self-diagnosis, be sure to erase the error memory. Refer to BRC-29, "CONSULT-II
Function (ABS)" .

Revision: September 2006 BRC-24 2007 Xterra
TROUBLE DIAGNOSIS
[VDC/TCS/ABS]
For Fast and Accurate Diagnosis EFS005HW

PRECAUTIONS FOR DIAGNOSIS A
G Before performing diagnosis, always read precautions. Refer to BRC-4, "PRECAUTIONS" .
G If ABS actuator and electric unit (control unit), steering angle sensor, steering system parts or suspension
system parts have been replaced, or if alignment has been adjusted, be sure to adjust neutral position of B
steering angle sensor before driving. Refer to BRC-56, "Adjustment of Steering Angle Sensor Neutral
Position" .
G After diagnosis is finished, be sure to erase memory. Refer to BRC-29, "SELF-DIAGNOSIS" . C
G When checking continuity and voltage between units, be sure to check for disconnection, looseness,
bend, or collapse of connector terminals. If any non-standard condition is found, repair or replace connec-
tor terminals. D
G For intermittent symptoms, possible cause is malfunction in harness, harness connector, or terminals.
Move harness, harness connector, and terminals to check for poor connections.
G If a circuit tester is used for the check, be careful not to forcibly extend any connector terminal. E
G To use CONSULT-II to perform self-diagnosis of ABS actuator and electric unit (control unit), active tests,
or work support, first stop work, then connect CONSULT-II and select "ABS".
G CONSULT-II self-diagnosis results are displayed without regard to occurrence timing. In some cases later BRC
ones (timing value is small) appear on the next screen.
G When self-diagnostic results of CONSULT-II show a malfunction, if CONSULT-II active test is performed,
an engine system error may be indicated. In this case, start engine to resume the normal screen. G
G VDC/TCS/ABS system electronically controls brake operation and engine output. The following symptoms
may be caused by normal operations:
H
Symptom Symptom description Result
This is noise of motor inside ABS actuator and electric unit (control unit).
Slight noise may occur during VDC, TCS, and ABS operation.

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