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BRC

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F BRAKES

SECTION
BRAKE CONTROL SYSTEM
BRC B

E
CONTENTS
ABS Control Unit Input/Output Signal Standard ............ 21 . BRC
REFERENCE VALUE FROM CONSULT-II ........ 21 .
PRECAUTIONS ......................................................... 4
. CONSULT-II Function (ABS) ................................. 23 .
Precautions for Supplemental Restraint System CONSULT-II BASIC OPERATION PROCEDURE G
(SRS) "AIR BAG" and "SEAT BELT PRE-TEN- ... 23
SIONER" ................................................................. 4
. SELF-DIAGNOSIS ............................................. 24 .
Precautions for Brake System ................................. 4 . DATA MONITOR ................................................ 26 .
Precautions When Using CONSULT-II .................... 4 . H
ACTIVE TEST .................................................... 27 .
CHECK POINTS FOR USING CONSULT-II ........ 4 . TROUBLE DIAGNOSIS FOR SELF-DIAGNOSTIC
Precautions for Brake Control ................................. 5 . ITEMS ....................................................................... 29
.
Precautions for CAN System .................................. 5 . Wheel Sensor System ........................................... 29 . I
Wiring Diagrams and Trouble Diagnosis ................. 6 . ABS Control Unit Inspection .................................. 30 .
PREPARATION .......................................................... 7
. Solenoid Valve System Inspection ........................ 31 .
Special Service Tool ................................................ 7
. Actuator Motor, Motor Relay, and Circuit Inspection 32 ... J
Commercial Service Tools ....................................... 7 . ABS Control Unit Power and Ground Systems
SYSTEM DESCRIPTION ........................................... 8 . Inspection .............................................................. 33
.
System Components ............................................... 8 . CAN Communication System Inspection ............... 33 .
ABS Function .......................................................... 8
. K
TROUBLE DIAGNOSES FOR SYMPTOMS ........... 34 .
EBD Function .......................................................... 8
. ABS Works Frequently .......................................... 34 .
Fail-Safe Function ................................................... 8
. Unexpected Pedal Action ...................................... 35 .
ABS/EBD SYSTEM .............................................. 8 . Long Stopping Distance ......................................... 36 . L
Hydraulic Circuit Diagram ....................................... 9 . ABS Does Not Work .............................................. 36 .
CAN COMMUNICATION ......................................... 10 . Pedal Vibration or ABS Operation Noise ............... 36 .
System Description ............................................... 10
. ABS Warning Lamp Does Not Come On When Igni- M
TROUBLE DIAGNOSIS ............................................11 . tion Switch Is Turned On ....................................... 37 .
How to Perform Trouble Diagnoses for Quick and ABS Warning Lamp Stays On When Ignition Switch
Accurate Repair .....................................................11
. Is Turned On .......................................................... 37
.
INTRODUCTION .................................................11 . WHEEL SENSORS .................................................. 38 .
WORK FLOW ..................................................... 12. Removal and Installation ....................................... 38 .
CLARIFY CONCERN ......................................... 13 . REMOVAL .......................................................... 38.
EXAMPLE OF DIAGNOSIS SHEET .................. 13 . INSTALLATION .................................................. 38 .
Component Parts and Harness Connector Location 14 ... SENSOR ROTOR .................................................... 39 .
Schematic ............................................................. 15
. Removal and Installation ....................................... 39 .
Wiring Diagram -- ABS -- .................................... 16 . FRONT ............................................................... 39
.
Basic Inspection .................................................... 20
. REAR (C200) ..................................................... 39 .
BRAKE FLUID LEVEL, FLUID LEAK, AND REAR (M226) ..................................................... 39 .
BRAKE PAD INSPECTION ................................ 20 . ACTUATOR AND ELECTRIC UNIT (ASSEMBLY)... 40
POWER SYSTEM TERMINAL LOOSENESS Removal and Installation ....................................... 40 .
AND BATTERY INSPECTION ........................... 20 . REMOVAL .......................................................... 40.
ABS WARNING LAMP INSPECTION ................ 20 . INSTALLATION .................................................. 41 .
Warning Lamp and Indicator Timing ..................... 21 .

Revision: November 2005 BRC-1 2005 Frontier
ABLS/ABS Actuator Motor, Motor Relay, and Circuit Inspection...74
Stop Lamp Switch System Inspection ....................75 .
PRECAUTIONS ........................................................ 42 . ABS/ABLS Control Unit Power and Ground Sys-
Precautions for Supplemental Restraint System tems Inspection ......................................................76
.
(SRS) "AIR BAG" and "SEAT BELT PRE-TEN- Brake Fluid Level Switch System Inspection .........77 .
SIONER" ................................................................ 42. Pressure Sensor System Inspection ......................78 .
Precautions for Brake System ............................... 42 . CAN Communication System Inspection ...............79 .
Precautions When Using CONSULT-II .................. 42 . TROUBLE DIAGNOSES FOR SYMPTOMS ............80 .
CHECK POINTS FOR USING CONSULT-II ....... 42 . ABS Works Frequently ...........................................80 .
Precautions for Brake Control ............................... 43 . Unexpected Pedal Action .......................................81 .
Precautions for CAN System ................................. 43 . Long Stopping Distance .........................................82 .
Wiring Diagrams and Trouble Diagnosis ............... 44 . ABS Does Not Work ..............................................82 .
PREPARATION ........................................................ 45 . Pedal Vibration or ABS Operation Noise ...............82 .
Special Service Tool .............................................. 45 . ABS Warning Lamp Does Not Come On When Igni-
Commercial Service Tools ..................................... 45 . tion Switch Is Turned On ........................................83 .
SYSTEM DESCRIPTION ......................................... 46 . ABS Warning Lamp Stays On When Ignition Switch
System Components ............................................. 46 . Is Turned On ..........................................................83
.
ABS Function ......................................................... 47 . WHEEL SENSORS ..................................................84 .
EBD Function ........................................................ 47 . Removal and Installation ........................................84 .
ABLS Function ....................................................... 47 . REMOVAL ...........................................................84
.
Fail-Safe Function ................................................. 47 . INSTALLATION ...................................................84 .
ABS/EBD SYSTEM ............................................ 47 . SENSOR ROTOR .....................................................85 .
ABLS SYSTEM ................................................... 47 . Removal and Installation ........................................85 .
Hydraulic Circuit Diagram ...................................... 48 . FRONT ................................................................85
.
CAN COMMUNICATION .......................................... 49 . REAR (C200) ......................................................85
.
System Description ................................................ 49 . REAR (M226) ......................................................85
.
TROUBLE DIAGNOSIS ........................................... 50 . ACTUATOR AND ELECTRIC UNIT (ASSEMBLY) ...86
How to Perform Trouble Diagnoses for Quick and Removal and Installation ........................................86 .
Accurate Repair ..................................................... 50 . REMOVAL ...........................................................86
.
INTRODUCTION ................................................ 50 . INSTALLATION ...................................................87 .
WORK FLOW ..................................................... 51 .
CLARIFY CONCERN ......................................... 52 .
EXAMPLE OF DIAGNOSIS SHEET ................... 52 .
HDC/HSA/VDC/TCS/ABS
Component Parts and Harness Connector Location 53 ... PRECAUTIONS ........................................................88.
Schematic .............................................................. 54. Precautions for Supplemental Restraint System
Wiring Diagram -- ABLS -- .................................. 55 . (SRS) "AIR BAG" and "SEAT BELT PRE-TEN-
Basic Inspection .................................................... 59 . SIONER" ................................................................88
.
BRAKE FLUID LEVEL, FLUID LEAK, AND Precautions for Brake System ...............................88 .
BRAKE PAD INSPECTION ................................ 59 . Precautions When Using CONSULT-II ..................88 .
POWER SYSTEM TERMINAL LOOSENESS CHECK POINTS FOR USING CONSULT-II .......88 .
AND BATTERY INSPECTION ............................ 59 . Precautions for Brake Control ................................89 .
ABS WARNING LAMP AND SLIP INDICATOR Precautions for CAN System .................................90 .
LAMP INSPECTION ........................................... 59 . Wiring Diagrams and Trouble Diagnosis ................90 .
Warning Lamp and Indicator Timing ...................... 60 . PREPARATION ........................................................91.
Control Unit Input/Output Signal Standard ............. 60 . Special Service Tool ...............................................91
.
REFERENCE VALUE FROM CONSULT-II ........ 60 . Commercial Service Tools .....................................91 .
CONSULT-II Function (ABS) ................................. 63 . SYSTEM DESCRIPTION ..........................................92 .
CONSULT-II BASIC OPERATION PROCEDURE System Components ..............................................92 .
... 63 ABS Function .........................................................93
.
SELF-DIAGNOSIS ............................................. 64 . EBD Function .........................................................93
.
DATA MONITOR ................................................. 67 . TCS Function .........................................................93
.
ACTIVE TEST .................................................... 69 . VDC Function .........................................................93
.
TROUBLE DIAGNOSIS FOR SELF-DIAGNOSTIC HDC Function ........................................................93
.
ITEMS ....................................................................... 71
. HSA Function .........................................................94
.
Wheel Sensor System Inspection .......................... 71 . Fail-Safe Function ..................................................94
.
Engine System Inspection ..................................... 72 . ABS/EBD SYSTEM .............................................94 .
ABS/ABLS Control Unit Inspection ........................ 73 . HDC/HSA SYSTEM ............................................94 .
Solenoid and Change-Over Valve System Inspec- VDC/TCS SYSTEM ............................................94 .
tion ......................................................................... 73
. Hydraulic Circuit Diagram ......................................95 .

Revision: November 2005 BRC-2 2005 Frontier
CAN COMMUNICATION ......................................... 96 . Steering Angle Sensor Safe Mode Inspection ..... 140 .
System Description ............................................... 96 . CAN Communication System Inspection ............. 140 . A
TROUBLE DIAGNOSIS ........................................... 97 . Inspection For Self-diagnosis Result "ST ANGLE
How to Perform Trouble Diagnoses for Quick and SEN SIGNAL" ...................................................... 141 .
Accurate Repair .................................................... 97. Inspection For Self-diagnosis Result "DECEL G B
INTRODUCTION ................................................ 97 . SEN SET" ............................................................ 141 .
WORK FLOW ..................................................... 98 . VDC OFF Indicator Lamp Does Not Illuminate .... 141 .
CLARIFY CONCERN ......................................... 99 . Component Inspection ......................................... 142 .
EXAMPLE OF DIAGNOSIS SHEET .................. 99 . VDC OFF SWITCH .......................................... 142 . C
Component Parts and Harness Connector Location 100 . HDC SWITCH .................................................. 142 .
Schematic ........................................................... 101
. TROUBLE DIAGNOSES FOR SYMPTOMS ......... 143 .
Wiring Diagram -- VDC -- .................................. 102 . ABS Works Frequently ........................................ 143 . D
Basic Inspection .................................................. 109. Unexpected Pedal Action .................................... 144 .
BRAKE FLUID LEVEL, FLUID LEAK, AND Long Stopping Distance ....................................... 145 .
BRAKE PAD INSPECTION .............................. 109 . ABS Does Not Work ............................................ 145 . E
POWER SYSTEM TERMINAL LOOSENESS Pedal Vibration or ABS Operation Noise ............. 145 .
AND BATTERY INSPECTION ......................... 109 . ABS Warning Lamp Does Not Come On When Igni-
ABS WARNING LAMP, SLIP INDICATOR LAMP, tion Switch Is Turned On ..................................... 146 .
VDC OFF INDICATOR LAMP AND HDC INDI- ABS Warning Lamp Stays On When Ignition Switch BRC
CATOR LAMP INSPECTION ........................... 109 . Is Turned On ........................................................ 146 .
For Fast and Accurate Diagnosis .........................110 . Vehicle Jerks During TCS/VDC Activation .......... 147 .
PRECAUTIONS FOR DIAGNOSIS ...................110 . Stop Lamp Relay Inspection ................................ 148 . G
Warning Lamp and Indicator Timing .................... 111 . HDC Switch Inspection ........................................ 148 .
Control Unit Input/Output Signal Standard ........... 111 . ON-VEHICLE SERVICE ......................................... 150 .
REFERENCE VALUE FROM CONSULT-II ....... 111 . Adjustment of Steering Angle Sensor Neutral Posi- H
CONSULT-II Function (ABS) ................................115 . tion ....................................................................... 150
.
CONSULT-II BASIC OPERATION PROCEDURE WITH CONSULT-II ........................................... 150 .
..115 WITHOUT CONSULT-II .................................... 150 .
I
SELF-DIAGNOSIS ............................................116 . Calibration of Decel G Sensor ............................. 150 .
DATA MONITOR ...............................................119 . WHEEL SENSORS ................................................ 152 .
ACTIVE TEST .................................................. 122 . Removal and Installation ..................................... 152 .
TROUBLE DIAGNOSIS FOR SELF-DIAGNOSTIC REMOVAL ........................................................ 152 . J
ITEMS .................................................................... 125
. INSTALLATION ................................................ 152 .
Wheel Sensor System Inspection ....................... 125 . SENSOR ROTOR .................................................. 153 .
Engine System Inspection ................................... 126 . Removal and Installation ..................................... 153 . K
ABS/TCS/VDC Control Unit Inspection ............... 127 . FRONT ............................................................. 153 .
Steering Angle Sensor System ........................... 127 . REAR ............................................................... 153.
Yaw Rate/Side/Decel G Sensor System Inspection 129 . ACTUATOR AND ELECTRIC UNIT (ASSEMBLY). 154
L
Solenoid and VDC Change-Over Valve System Removal and Installation ..................................... 154 .
Inspection ............................................................ 131
. REMOVAL ........................................................ 154 .
Actuator Motor, Motor Relay, and Circuit Inspection 132 . INSTALLATION ................................................ 155 .
Stop Lamp Switch System Inspection ................. 133 . STEERING ANGLE SENSOR ............................... 156 . M
ABS/TCS/VDC Control Unit Power and Ground Removal and Installation ..................................... 156 .
Systems Inspection ............................................. 134 . G SENSOR ............................................................. 157 .
Brake Fluid Level Switch System Inspection ...... 135 . Removal and Installation ..................................... 157 .
Active Booster System Inspection ....................... 136 . REMOVAL ........................................................ 157 .
Pressure Sensor System Inspection ................... 137 . INSTALLATION ................................................ 157 .

Revision: November 2005 BRC-3 2005 Frontier
PRECAUTIONS
[ABS]
PRECAUTIONS PFP:00001

Precautions for Supplemental Restraint System (SRS) "AIR BAG" and "SEAT
BELT PRE-TENSIONER" EFS005U7

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 EFS0059K

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 EFS0059L

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: November 2005 BRC-4 2005 Frontier
PRECAUTIONS
[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-22, "CAN COMMUNICATION" .
Precautions for Brake Control EFS0059M 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.
Precautions for CAN System EFS0059N

G Do not apply voltage of 7.0V or higher to terminal to be measured. J
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.
K
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).
L

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: November 2005 BRC-5 2005 Frontier
PRECAUTIONS
[ABS]
Wiring Diagrams and Trouble Diagnosis EFS0059O

When you read wiring diagrams, refer to the following:
G GI-17, "How to Read Wiring Diagrams".
G PG-4, "POWER SUPPLY ROUTING CIRCUIT".
When you perform trouble diagnosis, refer to the following:
G GI-13, "HOW TO FOLLOW TEST GROUPS IN TROUBLE DIAGNOSES".
G GI-29, "How to Perform Efficient Diagnosis for an Electrical Incident".

Revision: November 2005 BRC-6 2005 Frontier
PREPARATION
[ABS]
PREPARATION PFP:00002
A
Special Service Tool EFS0051T

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
205-D002 Removing axle shaft bearing
( -- )
Bearing splitter
BRC

ZZA0700D G

Commercial Service Tools EFS0051U

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

J
S-NT360

Revision: November 2005 BRC-7 2005 Frontier
SYSTEM DESCRIPTION
[ABS]
SYSTEM DESCRIPTION PFP:00000

System Components EFS0051V

WFIA0360E

ABS Function EFS0051W

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
the ABS warning lamp turns on.
G The electrical system can be diagnosed using CONSULT-II.
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.
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.
EBD Function EFS0051X

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
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 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.
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.
Fail-Safe Function EFS0051Y

CAUTION:
If the Fail-Safe function is activated, perform the Self Diagnosis for ABS system.
ABS/EBD SYSTEM
In case of an electrical malfunction with the ABS, the ABS warning lamp will turn on. In case of an electrical
malfunction with the EBD system, the brake warning lamp and the ABS warning lamp will turn on.
The system will revert to one of the following conditions of the Fail-Safe function.

Revision: November 2005 BRC-8 2005 Frontier
SYSTEM DESCRIPTION
[ABS]
1. For ABS malfunction, only the EBD is operative and the condition of the vehicle is the same condition of
vehicles without ABS system. A
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 or EBD system.
Hydraulic Circuit Diagram EFS0051Z
B

BRC

J
WFIA0369E

1. Inlet solenoid valve 2. Outlet solenoid valve 3. Reservoir K
4. Pump 5. Motor 6. Inlet valve
7. Outlet valve 8. Bypass check valve 9. Damper
10. Pressure switch L

Revision: November 2005 BRC-9 2005 Frontier
CAN COMMUNICATION
[ABS]
CAN COMMUNICATION PFP:23710

System Description EFS00520

Refer to LAN-22, "CAN COMMUNICATION" .

Revision: November 2005 BRC-10 2005 Frontier
TROUBLE DIAGNOSIS
[ABS]
TROUBLE DIAGNOSIS PFP:00000
A
How to Perform Trouble Diagnoses for Quick and Accurate Repair EFS00521

INTRODUCTION
The ABS system has an electronic control unit to control major func- B
tions. The control unit accepts input signals from sensors and con-
trols actuator operation. It is also important to check for air leaks in
the booster or lines, lack of brake fluid, or other malfunctions in the
brake system. C
It is much more difficult to diagnose a malfunction that occurs inter-
mittently rather than continuously. Most intermittent conditions are
caused by poor electrical connections or damaged wiring. In this D
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
road test should be performed.
SEF233G
E
Before undertaking actual checks, take just a few minutes to talk with
a customer who approaches with an ABS complaint. The customer
is a very good source of information, especially for intermittent condi- BRC
tions. 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 G
an ABS equipped vehicle. Also check related Service Bulletins for
information.
H
SEF234G

Revision: November 2005 BRC-11 2005 Frontier
TROUBLE DIAGNOSIS
[ABS]
WORK FLOW

LFIA0197E

Revision: November 2005 BRC-12 2005 Frontier
TROUBLE DIAGNOSIS
[ABS]
CLARIFY CONCERN
G A customer's description of a vehicle concern may vary depend- A
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 B
conditions. Use this information to reproduce the symptom while
driving.
G It is also important to use the diagnosis sheet to understand C
what type of symptoms the customer is experiencing.

SBR339B
D

EXAMPLE OF DIAGNOSIS SHEET
E

BRC

WFIA0226E

Revision: November 2005 BRC-13 2005 Frontier
TROUBLE DIAGNOSIS
[ABS]
Component Parts and Harness Connector Location EFS00522

WFIA0361E

Revision: November 2005 BRC-14 2005 Frontier
TROUBLE DIAGNOSIS
[ABS]
Schematic EFS00523

BRC

WFWA0262E

Revision: November 2005 BRC-15 2005 Frontier
TROUBLE DIAGNOSIS
[ABS]
Wiring Diagram -- ABS -- EFS00524

WFWA0263E

Revision: November 2005 BRC-16 2005 Frontier
TROUBLE DIAGNOSIS
[ABS]

BRC

WFWA0166E

Revision: November 2005 BRC-17 2005 Frontier
TROUBLE DIAGNOSIS
[ABS]

WFWA0167E

Revision: November 2005 BRC-18 2005 Frontier
TROUBLE DIAGNOSIS
[ABS]

BRC

WFWA0168E

Revision: November 2005 BRC-19 2005 Frontier
TROUBLE DIAGNOSIS
[ABS]
Basic Inspection EFS00525

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 INSPECTION
1. Make sure ABS warning lamp turns on for approximately 2 seconds when the ignition switch is turned ON.
If it does not, check CAN communications. If there are no errors with the CAN communication system,
check the combination meter. Refer to DI-5, "COMBINATION METERS" .
2. Make sure the lamp turns off approximately 2 seconds after the ignition switch is turned ON. If the lamp
does not turn off, conduct self-diagnosis.
3. Make sure ABS warning lamp turns off approximately 2 seconds after the engine is started. If ABS warn-
ing lamp has not turned off 10 seconds after the engine has been started, conduct self-diagnosis of the
ABS actuator and electric unit (control unit).
4. After conducting the self-diagnosis, be sure to erase the error memory. Refer to BRC-23, "CONSULT-II
Function (ABS)" .

Revision: November 2005 BRC-20 2005 Frontier
TROUBLE DIAGNOSIS
[ABS]
Warning Lamp and Indicator Timing EFS00526

A
ABS
Condition Remarks
warning lamp
When the ignition switch is OFF

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