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F BRAKES
A
B
SECTION
BRAKE CONTROL SYSTEM C
D
E
CONTENTS
ABS MODE ................................................................. 16
. BRC
CONSULT-II Inspection Procedure ........................ 16 .
PRECAUTIONS ......................................................... 3 . SELF-DIAGNOSIS PROCEDURE ..................... 16 .
Precautions for Supplemental Restraint System SELF-DIAGNOSTIC RESULTS MODE .............. 17 . G
(SRS) "AIR BAG" and "SEAT BELT PRE-TEN- DATA MONITOR PROCEDURE ......................... 18 .
SIONER" ................................................................. 3
. ACTIVE TEST PROCEDURE ............................ 19 .
Precautions for Brake System ................................. 3 . DATA MONITOR MODE ..................................... 20 .
Wiring Diagrams and Trouble Diagnosis ................. 3 . H
ACTIVE TEST MODE ........................................ 21 .
PREPARATION .......................................................... 4 . TROUBLE DIAGNOSIS -- INTRODUCTION .......... 22 .
Special Service Tools .............................................. 4 . How to Perform Trouble Diagnoses for Quick and
Commercial Service Tools ....................................... 4 . Accurate Repair ..................................................... 22 . I
DESCRIPTION ........................................................... 5 . INTRODUCTION ................................................ 22 .
Purpose ................................................................... 5
. TROUBLE DIAGNOSIS -- BASIC INSPECTION ... 23
Operation ................................................................ 5
. Preliminary Check ................................................. 23 . J
ABS Hydraulic Circuit .............................................. 5 . Ground Circuit Check ............................................ 25 .
System Components ............................................... 6 . ABS ACTUATOR AND ELECTRIC UNIT
System Description ................................................. 6 . GROUND ........................................................... 25 .
SENSOR .............................................................. 6. K
TROUBLE DIAGNOSIS -- GENERAL DESCRIP-
CONTROL UNIT (BUILT-IN ABS ACTUATOR TION ......................................................................... 26
.
AND ELECTRIC UNIT) ........................................ 6 . Malfunction Code/Symptom Chart ......................... 26 .
ABS ACTUATOR AND ELECTRIC UNIT ............. 7 . WHEEL SENSOR OR ROTOR ................................ 27 . L
Component Parts and Harness Connector Location 8 ..... Diagnostic Procedure ............................................ 27 .
Schematic ............................................................... 9
. ABS ACTUATOR SOLENOID VALVE AND SOLE-
Wiring Diagram -- ABS -- .................................... 10 . NOID VALVE RELAY ............................................... 29 . M
ON BOARD DIAGNOSTIC SYSTEM DESCRIP- Diagnostic Procedure ............................................ 29 .
TION ......................................................................... 14
. MOTOR RELAY OR MOTOR ................................... 31 .
Self-diagnosis ........................................................ 14
. Diagnostic Procedure ............................................ 31 .
FUNCTION ......................................................... 14 . LOW VOLTAGE ....................................................... 33 .
SELF-DIAGNOSIS PROCEDURE ..................... 14 . Diagnostic Procedure ............................................ 33 .
HOW TO READ SELF-DIAGNOSTIC RESULTS CONTROL UNIT ...................................................... 35 .
(MALFUNCTION CODES) ................................. 15 . Diagnostic Procedure ............................................ 35 .
HOW TO ERASE SELF-DIAGNOSTIC TROUBLE DIAGNOSES FOR SYMPTOMS ........... 36 .
RESULTS (MALFUNCTION CODES) ................ 15 . Symptom 1. ABS Works Frequently ...................... 36 .
CONSULT-II Function (ABS) ................................. 16 . Symptom 2. Unexpected Pedal Action .................. 36 .
ECU (ABS CONTROL UNIT) PART NUMBER Symptom 3. Long Stopping Distance .................... 37 .
Symptom 4. ABS Does Not Work .......................... 38 .
Symptom 5. Pedal Vibration and Noise ................. 38 .
Symptom 6. Warning Lamp Does Not Come On
When Ignition Switch Is Turned On ....................... 39 .
Symptom 7. Warning Lamp Stays On When Ignition
Revision: July 2005 BRC-1 2005 Sentra
Switch Is Turned On .............................................. 41
. REMOVAL AND INSTALLATION .............................44 .
Removal and Installation ........................................44
.
FRONT WHEEL SENSOR ..................................44 .
REAR WHEEL SENSOR (REAR DRUM) ...........44 .
REAR WHEEL SENSOR (REAR DISC) .............45 .
SENSOR ROTOR ...............................................45.
ACTUATOR ........................................................47
.
Revision: July 2005 BRC-2 2005 Sentra
PRECAUTIONS
[ABS]
PRECAUTIONS PFP:00001
A
Precautions for Supplemental Restraint System (SRS) "AIR BAG" and "SEAT
BELT PRE-TENSIONER" EFS0037M
The Supplemental Restraint System such as "AIR BAG" and "SEAT BELT PRE-TENSIONER", used along B
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. Information necessary to service the system safely is included in the SRS and SB section of
this Service Manual. C
WARNING:
q 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. D
q 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. E
q 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. BRC
Precautions for Brake System EFS0028O
q Recommended fluid is brake fluid "DOT 3". G
q Never reuse drained brake fluid.
q Be careful not to splash brake fluid on painted areas.
q To clean or wash all parts of master cylinder, disc brake cal- H
iper and wheel cylinder, use clean brake fluid.
q Never use mineral oils such as gasoline or kerosene. They
will ruin rubber parts of the hydraulic system. I
q Use flare nut wrench when removing and installing brake
tube.
q Always torque brake lines when installing. SBR686C J
q Burnish the brake contact surfaces after refinishing or
replacing drums or rotors, after replacing pads or linings, or if a soft pedal occurs at very low mile-
age. K
Refer to BR-7, "Brake Burnishing Procedure".
WARNING:
q Clean brake pads and shoes with a waste cloth, then wipe with a dust collector. L
Wiring Diagrams and Trouble Diagnosis EFS0028P
When you read wiring diagrams, refer to the following:
M
q GI-15, "How to Read Wiring Diagrams".
q PG-3, "POWER SUPPLY ROUTING".
When you perform trouble diagnosis, refer to the following:
q GI-11, "HOW TO FOLLOW TEST GROUPS IN TROUBLE DIAGNOSES".
q GI-27, "How to Perform Efficient Diagnosis for an Electrical Incident".
Revision: July 2005 BRC-3 2005 Sentra
PREPARATION
[ABS]
PREPARATION PFP:00002
Special Service Tools EFS004YP
The actual shapes of the Kent-Moore tools may differ from those of the special service tools illustrated here.
Tool number Description
(Kent-Moore No.)
Tool name
KV40104710 Install sensor rotor
( -- ) a: 76.3 mm (3.004 in) dia.
Drift b: 67.9 mm (2.673 in) dia.
NT474
ST30720000 Install sensor rotor
( -- ) a: 77 mm (3.03 in) dia.
Drift b: 55.5 mm (2.185 in) dia.
NT115
Commercial Service Tools EFS0037L
Tool name Description
1 Flare nut crowfoot Removing and installing brake piping
2 Torque wrench a: 10 mm (0.39 in)
S-NT360
Revision: July 2005 BRC-4 2005 Sentra
DESCRIPTION
[ABS]
DESCRIPTION PFP:00000
A
Purpose EFS00246
The Anti-Lock Brake System (ABS) consists of electronic and hydraulic components. It allows for control of
braking force so locking of the wheels can be avoided. B
1. Improves proper tracking performance through steering wheel operation.
2. Eases obstacle avoidance through steering wheel operation.
3. Improves vehicle stability. C
Operation EFS00247
q When the vehicle speed is less than 10 km/h (6 MPH), this system does not work. D
q The Anti-Lock Brake System (ABS) has a self-test function. The system turns on the ABS warning lamp
for 1 second each time the ignition switch is turned "ON". After the engine is started, the ABS warning
lamp turns off. The system performs a test the first time the vehicle reaches 6 km/h (4 MPH). A mechani- E
cal noise may be heard as the ABS performs this self-test. This is a normal part of the self-test feature. If
a malfunction is found during this check, the ABS warning lamp will stay on.
q While driving, a mechanical noise may be heard during ABS operation. This is a normal condition.
BRC
ABS Hydraulic Circuit EFS00248
G
H
I
J
K
L
M
WFIA0307E
1. Inlet solenoid valve 2. Outlet solenoid valve 3. Pump
4. Motor 5. Bypass check valve 6. Damper
7. Solenoid valve relay actuator
Revision: July 2005 BRC-5 2005 Sentra
DESCRIPTION
[ABS]
System Components EFS00249
WBR035
System Description EFS0024A
SENSOR
The sensor unit consists of a gear-shaped sensor rotor and a sensor
element. The element contains a bar magnet around which a coil is
wound. The front sensors are installed on the front spindles and the
rear sensors are installed on the rear spindles. As the wheel rotates,
the sensor generates a sine-wave pattern. The frequency and volt-
age increase(s) as the rotating speed increases.
SBR124B
CONTROL UNIT (BUILT-IN ABS ACTUATOR AND ELECTRIC UNIT)
The control unit computes the wheel rotating speed by the signal
current sent from the sensor. Then it supplies a DC current to the
actuator solenoid valve. It also controls ON-OFF operation of the
valve relay and motor relay. If any electrical malfunction should be
detected in the system, the control unit causes the warning lamp to
light up. In this condition, the ABS will be deactivated by the control
unit, and the vehicle's brake system reverts to normal operation. (For
control unit layout, refer to BRC-7, "ABS ACTUATOR AND ELEC-
TRIC UNIT" .)
WBR039
Revision: July 2005 BRC-6 2005 Sentra
DESCRIPTION
[ABS]
ABS ACTUATOR AND ELECTRIC UNIT
The ABS actuator and electric unit contains: A
q An electric motor and pump
q Two relays
B
q Eight solenoid valves, each inlet and outlet for
-- LH front
-- RH front
-- LH rear C
-- RH rear
q ABS control unit
This component controls the hydraulic circuit and increases, holds or WBR040
D
decreases hydraulic pressure to all or individual wheels. The ABS
actuator and electric unit is serviced as an assembly.
ABS Actuator Operation E
Inlet solenoid Outlet solenoid
valve valve
BRC
Master cylinder brake fluid pressure is directly trans-
Normal brake operation OFF (Open) OFF (Closed)
mitted to caliper via the inlet solenoid valve.
Hydraulic circuit is shut off to hold the caliper brake
Pressure hold ON (Closed) OFF (Closed) G
fluid pressure.
Caliper brake fluid is sent to reservoir via the outlet
Pressure
ABS operation ON (Closed) ON (Open) solenoid valve. Then it is pushed up to the master
decrease
cylinder by pump. H
Pressure Master cylinder brake fluid pressure is transmitted to
OFF (Open) OFF (Closed)
increase caliper.
I
J
K
L
M
Revision: July 2005 BRC-7 2005 Sentra
DESCRIPTION
[ABS]
Component Parts and Harness Connector Location EFS0024B
WFIA0294E
Revision: July 2005 BRC-8 2005 Sentra
DESCRIPTION
[ABS]
Schematic EFS0024C
A
B
C
D
E
BRC
G
H
I
J
K
L
M
WFWA0001E
Revision: July 2005 BRC-9 2005 Sentra
DESCRIPTION
[ABS]
Wiring Diagram -- ABS -- EFS0024D
WFWA0002E
LBR071
Revision: July 2005 BRC-10 2005 Sentra
DESCRIPTION
[ABS]
A
B
C
D
E
BRC
G
H
I
J
K
L
M
WFWA0004E
LBR072
Revision: July 2005 BRC-11 2005 Sentra
DESCRIPTION
[ABS]
WFWA0108E
Revision: July 2005 BRC-12 2005 Sentra
DESCRIPTION
[ABS]
ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT)
TERMINALS AND REFERENCE VALUE MEASURED BETWEEN EACH TERMINAL AND GROUND
A
TERMINAL WIRE
ITEM CONDITION DATA (APPROX.)
NO. COLOR
ABS WARNING LAMP IN WHEN ABS LAMP IS ACTIVE 0V
10 L/B B
COMBINATION METER WHEN ABS LAMP IS NOT ACTIVE BATTERY VOLTAGE
11 GY/L DATA LINK CONNECTOR -- --
12 OR/B DATA LINK CONNECTOR -- -- C
WHEN BRAKE PEDAL IS DEPRESSED BATTERY VOLTAGE
14 R/G STOP LAMP SWITCH
WHEN BRAKE PEDAL IS RELEASED 0V
D
22 G/B DATA LINK CONNECTOR -- --
E
BRC
G
H
I
J
K
L
M
Revision: July 2005 BRC-13 2005 Sentra
ON BOARD DIAGNOSTIC SYSTEM DESCRIPTION
[ABS]
ON BOARD DIAGNOSTIC SYSTEM DESCRIPTION PFP:00000
Self-diagnosis EFS0024E
FUNCTION
q When a problem occurs in the ABS, the warning lamp on the instrument panel comes on. To start the self-
diagnostic results mode, ground the self-diagnostic (check) terminal located on Data Link Connector. The
location of the malfunction is indicated by the warning lamp flashing.
SELF-DIAGNOSIS PROCEDURE
1. Drive vehicle over 30 km/h (19 MPH) for at least one minute.
2. Turn ignition switch OFF.
3. Ground terminal 9 of Data Link Connector with a suitable har-
ness.
4. Turn ignition switch ON while grounding terminal 9.
Do not depress brake pedal.
WBR045
5. After 3.0 seconds, the warning lamp starts flashing to indicate
the malfunction code No. (See NOTE.)
6. Verify the location of the malfunction with the malfunction code
chart. Refer to BRC-26, "Malfunction Code/Symptom Chart" .
Then make the necessary repairs following the diagnostic pro-
cedures.
7. After the malfunctions are repaired, erase the malfunction codes
stored in the control unit. Refer to BRC-15, "HOW TO ERASE
SELF-DIAGNOSTIC RESULTS (MALFUNCTION CODES)" .
8. Repeat the self-diagnostic results mode to verify that the mal-
function codes have been erased. WBR039
9. Disconnect the check terminal from ground. The self-diagnostic
results mode is now complete.
10. Check warning lamp for deactivation after driving vehicle over
30 km/h (19 MPH) for at least one minute.
11. After making certain that warning lamp does not come on, test
the ABS in a safe area to verify that it functions properly.
NOTE:
The indication terminates after 5 minutes.
However, when the ignition switch is turned from OFF to ON, the
indication starts flashing again.
WBR045
Revision: July 2005 BRC-14 2005 Sentra
ON BOARD DIAGNOSTIC SYSTEM DESCRIPTION
[ABS]
HOW TO READ SELF-DIAGNOSTIC RESULTS (MALFUNCTION CODES)
1. Determine the code No. by counting the number of times the warning lamp flashes on and off. A
2. When several malfunctions occur at one time, up to three code numbers can be stored; the latest mal-
function will be indicated first.
3. The indication begins with the start code 12. After that a maximum of three code numbers appear in the B
order of the latest one first. The indication then returns to the start code 12 to repeat (the indication will
stay on for five minutes at most).
4. Refer to BRC-26, "Malfunction Code/Symptom Chart" for a list of malfunction codes. C
D
E
BRC
SBR457D
G
HOW TO ERASE SELF-DIAGNOSTIC RESULTS (MALFUNCTION CODES)
1. Disconnect the check terminal from ground (ABS warning lamp
will stay lit).
H
2. Within 12.5 seconds, ground the check terminal three times.
Each terminal ground must last more than 1 second. The ABS
warning lamp goes out after the erase operation has been com-
pleted. I
3. Perform self-diagnosis again. Refer to BRC-14, "SELF-DIAG-
NOSIS PROCEDURE" . Only the start code should appear, no
malfunction codes. J
ABR256
K
L
M
Revision: July 2005 BRC-15 2005 Sentra
ON BOARD DIAGNOSTIC SYSTEM DESCRIPTION
[ABS]
CONSULT-II Function (ABS) EFS0024F
CONSULT-II can display each diagnostic item using the diagnostic test modes shown following.
ABS diagnostic mode Description
Supports inspection and adjustments. Commands are transmitted to the ABS actuator and electric
WORK SUPPORT unit (control unit) for setting the status suitable for required operation, input/output signals are
received from the ABS actuator and electric unit (control unit) and received data is displayed.
SELF-DIAG RESULTS Displays ABS actuator and electric unit (control unit) self-diagnosis results.
DATA MONITOR Displays ABS actuator and electric unit (control unit) input/output data in real time.
CAN DIAG SUPPORT MNTR The result of transmit/receive diagnosis of CAN communication can be read.
ACTIVE TEST Operation of electrical loads can be checked by sending drive signal to them.
Conducted by CONSULT-II instead of a technician to determine whether each system is "OK" or
FUNCTION TEST
"NG".
ECU PART NUMBER ABS actuator and electric unit (control unit) part number can be read.
ECU (ABS CONTROL UNIT) PART NUMBER MODE
Ignore the ECU part number displayed in the ECU PART NUMBER MODE. Refer to Parts Catalog to order the
ECU.
CONSULT-II Inspection Procedure EFS0024G
SELF-DIAGNOSIS PROCEDURE
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.
1. Turn ignition switch OFF.
2. Connect CONSULT-II and CONSULT-II CONVERTER to the
data link connector.
3. Start engine.
4. Drive vehicle over 30 km/h (19 MPH) for at least one minute.
LAT136
5. Stop vehicle with engine running and touch "START (NISSAN
BASED VHCL)" on CONSULT-II screen.
BCIA0029E
Revision: July 2005 BRC-16 2005 Sentra
ON BOARD DIAGNOSTIC SYSTEM DESCRIPTION
[ABS]
6. Touch "ABS". If "ABS" is not indicated, go to GI-39, "CONSULT-
II Data Link Connector (DLC) Circuit" . A
B
C
BCIA0030E
D
7. Touch "SELF-DIAG RESULTS".
q The screen shows the detected malfunction and how many
times the ignition switch has been turned ON since the malfunc- E
tion.
8. Make the necessary repairs following the diagnostic procedures.
BRC
G
BCIA0031E
9. After the malfunctions are repaired, erase the self-diagnostic H
results stored in the control unit by touching "ERASE".
10. Check warning lamp for deactivation after driving vehicle over
30 km/h (19 MPH) for at least one minute. I
11. Test the ABS in a safe area to verify that it functions properly.
J
K
PBR950C
SELF-DIAGNOSTIC RESULTS MODE
L
Diagnostic item Diagnostic item is detected when... Reference Page
FR RH SENSOR1 q Circuit for front right wheel sensor is open.
(An abnormally high input voltage is entered.) BRC-27
[OPEN] M
FR LH SENSOR1 q Circuit for front left wheel sensor is open.
(An abnormally high input voltage is entered.) BRC-27
[OPEN]
RR RH SENSOR1 q Circuit for rear right sensor is open.
BRC-27
[OPEN] (An abnormally high input voltage is entered.)
RR LH SENSOR1 q Circuit for rear left sensor is open.
(An abnormally high input voltage is entered.) BRC-27
[OPEN]
FR RH SENSOR1 q Circuit for front right wheel sensor is shorted.
(An abnormally low input voltage is entered.) BRC-27
[SHORT]
FR LH SENSOR1 q Circuit for front left wheel sensor is shorted.
BRC-27
[SHORT] (An abnormally low input voltage is entered.)
RR RH SENSOR1 q Circuit for rear right sensor is shorted.
(An abnormally low input voltage is entered.) BRC-27
[SHORT]
RR LH SENSOR1 q Circuit for rear left sensor is shorted.
BRC-27
[SHORT] (An abnormally low input voltage is entered.)
Revision: July 2005 BRC-17 2005 Sentra
ON BOARD DIAGNOSTIC SYSTEM DESCRIPTION
[ABS]
Diagnostic item Diagnostic item is detected when... Reference Page
ABS SENSOR1 q Tooth damage on sensor rotor or improper installation of wheel sensor.
BRC-27
[ABNORMAL SIGNAL] (Abnormal wheel sensor signal is entered.)
FR RH IN ABS SOL q Circuit for front right inlet solenoid valve is open.
BRC-29
[OPEN, SHORT] (An abnormally low output voltage is entered.)
FR LH IN ABS SOL q Circuit for front left inlet solenoid valve is open.
BRC-29
[OPEN, SHORT] (An abnormally low output voltage is entered.)
FR RH OUT ABS SOL q Circuit for front right outlet solenoid valve is open.
BRC-29
[OPEN, SHORT] (An abnormally low output voltage is entered.)
FR LH OUT ABS SOL q Circuit for front left outlet solenoid valve is open.
BRC-29
[OPEN, SHORT] (An abnormally low output voltage is entered.)
RR RH IN ABS SOL q Circuit for rear right inlet solenoid valve is shorted.
BRC-29
[OPEN, SHORT] (An abnormally high output voltage is entered.)
RR LH IN ABS SOL q Circuit for rear left inlet solenoid valve is shorted.
BRC-29
[OPEN, SHORT] (An abnormally high output voltage is entered.)
RR RH OUT ABS SOL q Circuit for rear right outlet solenoid valve is shorted.
BRC-29
[OPEN, SHORT] (An abnormally high output voltage is entered.)
RR LH OUT ABS SOL q Circuit for rear left outlet solenoid valve is shorted.
BRC-29
[OPEN, SHORT] (An abnormally high output voltage is entered.)
ABS ACTUATOR RELAY q Actuator solenoid valve relay is ON, even if control unit sends off signal.
BRC-29
[ABNORMAL] q Actuator solenoid valve relay is OFF, even if control unit sends on signal.
q Circuit for ABS motor relay is open or shorted.
ABS MOTOR RELAY
q Circuit for actuator motor is open or shorted. BRC-31
[ABNORMAL]
q Actuator motor relay is stuck.
BATTERY VOLT q Power source voltage supplied to ABS control unit is abnormally low.
BRC-33
[VB-LOW]
CONTROL UNIT q Function of calculation in ABS control unit has failed. BRC-35
1: If one or more wheels spin on a rough or slippery road for 40 seconds or more, the ABS warning lamp will illuminate. This does not
indicate a malfunction. Only in the case of the short-circuit (Code Nos. 26, 22, 32 and 36), after repair the ABS warning lamp also illumi-
nates when the ignition switch is turned ON. In this case, drive the vehicle at speeds greater than 30 km/h (19 MPH) for approximately 1
minute as specified in BRC-14, "SELF-DIAGNOSIS PROCEDURE" . Check to ensure that the ABS warning lamp goes out while the
vehicle is being driven.
DATA MONITOR PROCEDURE
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.
1. Turn ignition switch OFF.
2. Connect CONSULT-II and CONSULT-II CONVERTER to the
data link connector.
3. Turn ignition switch ON.
4. Touch "START (NISSAN BASED VHCL)" on CONSULT-II
screen.
BCIA0029E
Revision: July 2005 BRC-18 2005 Sentra
ON BOARD DIAGNOSTIC SYSTEM DESCRIPTION
[ABS]
5. Touch "ABS". If "ABS" is not indicated, go to GI-39, "CONSULT-
II Data Link Connector (DLC) Circuit" . A
B
C
BCIA0030E
D
6. Touch "DATA MONITOR".
E
BRC
G
BCIA0031E
ACTIVE TEST PROCEDURE H
q When conducting Active test, vehicle must be stationary.
q When ABS warning lamp stays on, never conduct Active test.
CAUTION: I
If CONSULT-II is used with no connection of CONSULT-II CON-
VERTER, malfunctions might be detected in self-diagnosis
depending on control unit which carries out CAN communica-
tion. J
1. Turn ignition switch OFF.
2. Connect CONSULT-II and CONSULT-II CONVERTER to the
K
data link connector. BCIA0029E
3. Start engine.
4. Touch "START (NISSAN BASED VHCL)" on CONSULT-II screen. L
5. Touch "ABS". If "ABS" is not indicated, go to GI-39, "CONSULT-
II Data Link Connector (DLC) Circuit" .
M
BCIA0030E
Revision: July 2005 BRC-19 2005 Sentra
ON BOARD DIAGNOSTIC SYSTEM DESCRIPTION
[ABS]
6. Touch "ACTIVE TEST".
BCIA0031E
7. Select active test item by touching screen.
PBR976C
8. Touch "START".
9. Carry out the active test by touching screen key.
PBR934C
DATA MONITOR MODE
MONITOR ITEM CONDITION SPECIFICATION
FR LH SENSOR
FR RH SENSOR Drive vehicle. Wheel speed signal
RR LH SENSOR (Each wheel is rotating.) (Almost the same speed as speedometer.)
RR RH SENSOR
Ignition switch is ON or engine ABS warning lamp is turned on: ON
WARNING LAMP
is running. ABS warning lamp is turned off: OFF
Depress the pedal: ON
STOP LAMP SW Brake is depressed.
Release the pedal: OFF
1. Drive vehicle at speeds over
30 km/h (19 MPH) for at least ABS is not operating: OFF
MOTOR RELAY
1 minute. ABS is operating: ON
2. Engine is running.
Ignition switch is ON or engine Ignition switch ON (Engine stops): OFF
ACTUATOR RELAY
is running. Engine running: ON
Revision: July 2005 BRC-20 2005 Sentra
ON BOARD DIAGNOSTIC SYSTEM DESCRIPTION
[ABS]
MONITOR ITEM CONDITION SPECIFICATION
A
FR LH OUT SOL
FR LH IN SOL
FR RH OUT SOL 1. Drive vehicle at speeds over
FR RH IN SOL 30 km/h (19 MPH) for at least Operating conditions for each solenoid valve are indicated. ABS is B
RR LH OUT SOL 1 minute. not operating: OFF
RR LH IN SOL 2. Engine is running.
RR RH OUT SOL
RR RH IN SOL C
Ignition switch is ON or engine
BATTERY VOLT Power supply voltage for control unit
is running.
D
ACTIVE TEST MODE
TEST ITEM CONDITION JUDGEMENT
Brake fluid pressure control operation E
FR RH SOL IN SOL OUT SOL
FR LH SOL
UP (Increase): OFF OFF
RR RH SOL
RR LH SOL KEEP (Hold): ON OFF
BRC
Engine is running.
DOWN (Decrease): ON ON
ABS actuator motor
G
ABS MOTOR ON: Motor runs (ABS motor relay ON)
OFF: Motor stops (ABS motor relay OFF)
NOTE:
Active test will automatically stop ten seconds after the test starts. (TEST IS STOPPED monitor shows ON.) H
I
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K
L
M
Revision: July 2005 BRC-21 2005 Sentra
TROUBLE DIAGNOSIS -- INTRODUCTION
[ABS]
TROUBLE DIAGNOSIS -- INTRODUCTION PFP:00000
How to Perform Trouble Diagnoses for Quick and Accurate Repair EFS0024H
INTRODUCTION
The ABS system has an electronic control unit to control major func-
tions. The control unit accepts input signals from sensors and
instantly drives the actuators. It is essential that both kinds of signals
are proper and stable. It is also important to check for conventional
problems: such as air leaks in booster lines, lack of brake fluid, or
other problems with the brake system.
It is much more difficult to diagnose a problem that occurs intermit-
tently rather than continuously. Most intermittent problems are
caused by poor electric connections or faulty wiring. In this case,
careful checking of suspicious circuits may help prevent the replace-
ment of good parts.
SEF233G
A visual check only may not find the cause of the problems, so a
road test should be performed.
Before undertaking actual checks, take a few minutes to talk with a
customer who approaches with an ABS complaint. The customer is
a very good source of information on such problems; especially
intermittent ones. By talking to the customer, find out what symptoms
are present and under what conditions they occur. Start your diagno-
sis by looking for "conventional" problems first. This is one of the
best ways to troubleshoot brake problems on an ABS controlled
vehicle.
Also check related Service bulletins for information.
SEF234G
Revision: July 2005 BRC-22 2005 Sentra
TROUBLE DIAGNOSIS -- BASIC INSPECTION
[ABS]
TROUBLE DIAGNOSIS -- BASIC INSPECTION PFP:00000
A
Preliminary Check EFS0024I
1. CHECK BRAKE FLUID B
Check brake fluid for contamination.
Has brake fluid been contaminated? C
YES >> Replace. GO TO 2.
NO >> GO TO 2.
D
2. CHECK BRAKE FLUID LEVEL
Check brake fluid level in reservoir tank.
Low fluid level may indicate brake pad wear or leakage from brake E
line.
Is brake fluid filled between MAX and MIN lines on reservoir tank?
YES >> GO TO 3. BRC
NO >> Fill brake fluid. GO TO 3.
G
SBR451D
H
3. CHECK BRAKE LINE
I
Check brake line for leakage.
Is leakage present at or around brake lines, tubes or hoses or are
any of these parts cracked or damaged?
J
YES >> Repair or replace as required. GO TO 4.
NO >> GO TO 4.
K
L
SBR389C
4. CHECK BRAKE BOOSTER OPERATION M
Check brake booster for operation. Refer to BR-16, "OPERATING
CHECK" . Also, check air tightness. Refer to BR-16, "AIRTIGHT
CHECK" .
Is brake booster airtight and functioning properly?
YES >> GO TO 5.
NO >> Replace. GO TO 5.
SBR058C
Revision: July 2005 BRC-23 2005 Sentra
TROUBLE DIAGNOSIS -- BASIC INSPECTION
[ABS]
5. CHECK BRAKE PAD, ROTOR, SHOE AND DRUM
Check brake pad, rotor, shoe and drum.
Refer to BR-19, "FRONT DISC BRAKE (CL25VA/CL25VB TYPE)" ,
BR-23, "FRONT DISC BRAKE (OPB27VA TYPE)" , BR-29, "REAR
DISC BRAKE" or BR-38, "REAR DRUM BRAKE" .
Are brake pads, rotors, shoes and drums functioning properly?
YES >> GO TO 6.
NO >> Replace.
SBR059C
6. RECHECK BRAKE FLUID LEVEL
Check brake fluid level in reservoir tank again.
Is brake fluid filled between MAX and MIN lines on reservoir tank?
YES >> GO TO 7.
NO >> Fill brake fluid reservoir to specification.
SBR451D
7. CHECK WARNING LAMP ACTIVATION
Check warning lamp activation.
Does warning lamp turn on when ignition switch is turned ON?
YES >> GO TO 8.
NO >> Check fuse, warning lamp bulb and warning lamp circuit.
WBR039
8. CHECK WARNING LAMP DEACTIVATION
Check warning lamp for deactivation after engine is started.
Does warning lamp turn off when engine is started?
YES >> GO TO 9.
NO (with CONSULT-II)>> Refer to BRC-16, "SELF-DIAGNOSIS PROCEDURE" .
NO (without CONSULT-II)>> Refer to BRC-16, "SELF-DIAGNOSIS PROCEDURE" .
9. DRIVE VEHICLE
Drive vehicle at speeds over 30 km/h (19 MPH) for at least one minute.
Does warning lamp remain off after vehicle has been driven at 30 km/h (19 MPH) for at least one minute?
YES >> Inspection End.
NO (with CONSULT-II)>> Refer to BRC-16, "SELF-DIAGNOSIS PROCEDURE" .
NO (without CONSULT-II)>> Refer to BRC-16, "SELF-DIAGNOSIS PROCEDURE" .
Revision: July 2005 BRC-24 2005 Sentra
TROUBLE DIAGNOSIS -- BASIC INSPECTION
[ABS]
Ground Circuit Check EFS0024J
ABS ACTUATOR AND ELECTRIC UNIT GROUND A
q Check resistance between ABS actuator and electric unit con-
nector terminals and ground.
B
Resistance : Approximately 0
C
D
LBR047
E
BRC
G
H
I
J
K
L
M
Revision: July 2005 BRC-25 2005 Sentra
TROUBLE DIAGNOSIS -- GENERAL DESCRIPTION
[ABS]
TROUBLE DIAGNOSIS -- GENERAL DESCRIPTION PFP:00000
Malfunction Code/Symptom Chart EFS0024K
Code No. Malfunctioning Part ◦ Jabse Service Manual Search 2024 ◦ Jabse Pravopis ◦ onTap.bg ◦ Other service manual resources online : Fixya ◦ eServiceinfo