2001 NISSAN ALMERA brake sensor

15. Engine Speed Does Not Return To Idle
(Light Braking D
4®D3)=NJAT0345SYMPTOM:
+Engine speed does not smoothly return to idle when A/T
shifts from D
4to D3.
+Vehicle does not decelerate by engine brake when turning
overdrive control switch OFF.
+Vehicle does not decelerate by engine brake when shifting
A/T from ªDº to ª2º position.
1 CHECK SELF-DIAGNOSTIC RESULTS
Does self-diagnosis show damage to overrun clutch solenoid valve circuit after cruise test?
SAT348H
YesorNO
Ye s©Check overrun clutch solenoid valve circuit. Refer to AT-154 (General and except for
Euro-OBD)/AT-268 (Euro-OBD).
No©GO TO 2.
2 CHECK THROTTLE POSITION SENSOR
Check throttle position sensor. Refer to EC-207, ªDTC P0120 THROTTLE POSITION SENSORº.
SAT004K
OK or NG
OK©GO TO 3.
NG©Repair or replace throttle position sensor. (AT-134: General and except for Euro-OBD/AT-
258: Euro-OBD)
TROUBLE DIAGNOSES FOR SYMPTOMS
15. Engine Speed Does Not Return To Idle (Light Braking D4®D3)
AT-328

Wheel Hub and Knuckle
COMPONENTS=NJAX0008
SAX007-A
1. Drive shaft
2. Knuckle
3. Baffle plate (where fitted)
4. ABS sensor5. Wheel bearing assembly
6. Snap ring
7. Hub bolt
8. Wheel hub9. Wheel bearing lock nut
10. Cotter pin
11. Brake disc
12. Wheel nut
REMOVALNJAX0009CAUTION:
Before removing the front axle assembly, disconnect the ABS
wheel sensor from the assembly. Then move it away from the
front axle assembly area.
Failure to do so may result in damage to the sensor wires and
the sensor becoming inoperative.
SFA090A
1. Remove wheel bearing lock nut.
FRONT AXLE
Wheel Hub and Knuckle
AX-5

SBR686C
Precautions
PRECAUTIONSNJAX0022+When installing each rubber part, final tightening must be
carried out under unladen condition* with tires on ground.
*: Fuel, radiator coolant and engine oil full. Spare tire, jack,
hand tools and mats in designated positions.
+Use flare nut wrench when removing or installing brake
tubes.
+After installing removed suspension parts, check wheel
alignment.
+Do not jack up at the trailing arm and lateral link.
+Always torque brake lines when installing.
Preparation
SPECIAL SERVICE TOOLSNJAX0032
Tool number
Tool nameDescription
KV40104710
Drift
NT474
Install ABS sensor rotor
a: 76.3 mm (3.004 in) dia.
b: 67.9 mm (2.673 in) dia.
ST3072000
Drift
NT115
Install ABS sensor rotor
a: 77 mm (3.03 in) dia.
b: 55.5 mm (2.185 in) dia.
COMMERCIAL SERVICE TOOLSNJAX0024
Tool name Description
1 Flare nut crowfoot
2 Torque wrench
NT360
Removing and installing brake piping
a: 10 mm (0.39 in)
REAR AXLE
Precautions
AX-22

SRA711A
1. Remove brake caliper assembly.
2. Remove wheel bearing lock nut.
3. Remove brake rotor (models with disk brake) or brake drum
(models with drum brakes).
4. Remove wheel hub bearing from spindle.
CAUTION:
Do not disconnect brake hose from caliper.
+Suspend caliper assembly with wire so as not to stretch
brake hose.
+Be careful not to depress brake pedal, or piston will pop
out.
Make sure brake hose is not twisted.
ARA082
5. Remove the sensor rotor using suitable puller, drift and bea
ring replacer.
SAX014
INSTALLATIONNJAX0030+With vehicles equipped with ABS, press-fit ABS sensor rotor
into wheel hub bearing using a drift.
Do not reuse ABS sensor rotor. When installing, replace it
with a new one.
SRA734AB
+Press-fit ABS sensor rotor as far as the location shown in fig-
ure at left.
Height ªhº:
Models with disk brakes
1.5 - 2.5 mm (0.059 - 0.098 in)
Models with drum brakes
17.7 - 18.7 mm (0.697 - 0.736 in)
REAR AXLE
Wheel Hub (Cont'd)
AX-25

REAR DISC BRAKE (CAM & STRUT TYPE)..............35
Component ................................................................35
Pad Replacement ......................................................35
Removal .....................................................................37
Disassembly...............................................................37
Inspection...................................................................38
CALIPER.................................................................38
ROTOR...................................................................39
Assembly ...................................................................39
Installation ..................................................................42
REAR DISC BRAKE (BALL & RAMP TYPE)..............43
Component ................................................................43
Pad Replacement ......................................................43
Removal .....................................................................45
Disassembly...............................................................45
Inspection...................................................................45
CALIPER.................................................................45
ROTOR...................................................................46
Installation ..................................................................46
PARKING BRAKE CONTROL......................................47
Components...............................................................47
Removal and Installation ...........................................47
Inspection...................................................................47
Adjustment .................................................................48
ABS
DESCRIPTION...............................................................49
Purpose......................................................................49
ABS (Anti-Lock Brake System) Operation ................49
ABS Hydraulic Circuit ................................................49
System Components .................................................50
System Description ....................................................50
SENSOR.................................................................50
CONTROL UNIT......................................................50
ABS ACTUATOR AND ELECTRIC UNIT....................50
Component Parts and Harness Connector
Location .....................................................................52
Schematic/Sedan .......................................................53
Wiring Diagram - ABS -/Sedan..................................54
Schematic/Hatchback ................................................58
Wiring Diagram - ABS -/Hatchback ...........................59
MODELS WITH SELF-DIAGNOSIS FUNCTION
(DATA LINK CONNECTOR TERMINAL NO. 9)
...........59
MODELS WITHOUT SELF-DIAGNOSIS
FUNCTION (DATA LINK CONNECTOR TERMINAL
NO. 9)
.....................................................................60
ON BOARD DIAGNOSTIC SYSTEM
DESCRIPTION...............................................................63
Self-diagnosis (Only Models with Data Link
Connector Terminal No. 9) ........................................63
FUNCTION..............................................................63
SELF-DIAGNOSIS PROCEDURE..............................63
HOW TO READ SELF-DIAGNOSTIC RESULTS
(MALFUNCTION CODES)
........................................64
HOW TO ERASE SELF-DIAGNOSTIC RESULTS
(MALFUNCTION CODES)
........................................64
CONSULT-II ...............................................................65
CONSULT-II APPLICATION TO ABS..........................65
ECU (ABS CONTROL UNIT) PART NUMBER
MODE
.....................................................................65
CONSULT-II Inspection Procedure............................65
SELF-DIAGNOSIS PROCEDURE..............................65
SELF-DIAGNOSTIC RESULTS MODE.......................67
DATA MONITOR PROCEDURE................................68
ACTIVE TEST PROCEDURE....................................69
DATA MONITOR MODE...........................................70
ACTIVE TEST MODE...............................................70
TROUBLE DIAGNOSIS - INTRODUCTION..................71
How to Perform Trouble Diagnoses for Quick
and Accurate Repair ..................................................71
INTRODUCTION......................................................71
TROUBLE DIAGNOSIS - BASIC INSPECTION...........72
Preliminary Check......................................................72
Ground Circuit Check ................................................75
ABS ACTUATOR AND ELECTRIC UNIT GROUND.....75
TROUBLE DIAGNOSIS - GENERAL
DESCRIPTION...............................................................76
Malfunction Code/Symptom Chart.............................76
MODELS WITH SELF-DIAGNOSIS FUNCTION
(DATA LINK CONNECTOR TERMINAL NO. 9)
...........76
TROUBLE DIAGNOSES FOR SELF-DIAGNOSTIC
ITEMS.............................................................................78
Wheel Sensor or Rotor ..............................................78
DIAGNOSTIC PROCEDURE.....................................78
ABS Actuator Solenoid Valve or Solenoid Valve
Relay ..........................................................................81
DIAGNOSTIC PROCEDURE.....................................81
Motor Relay or Motor.................................................84
DIAGNOSTIC PROCEDURE.....................................84
Low Voltage ...............................................................86
DIAGNOSTIC PROCEDURE.....................................86
Control Unit ................................................................88
DIAGNOSTIC PROCEDURE.....................................88
TROUBLE DIAGNOSES FOR SYMPTOMS.................89
1. ABS Works Frequently ..........................................89
2. Unexpected Pedal Action ......................................89
3. Long Stopping Distance ........................................90
4. ABS Does Not Work ..............................................91
5. Pedal Vibration and Noise.....................................92
6. ABS Warning Lamp Does Not Come On
When Ignition Switch Is Turned On...........................93
7. ABS Warning Lamp Stays On When Ignition
Switch Is Turned On ..................................................95
REMOVAL AND INSTALLATION.................................97
Wheel Sensors ..........................................................97
ABS Actuator and Electric Unit..................................98
CONTENTS(Cont'd)
BR-2

REMOVAL...............................................................98
INSTALLATION........................................................98
Sensor Rotor..............................................................99
REMOVAL...............................................................99
INSTALLATION........................................................99
SERVICE DATA AND SPECIFICATIONS (SDS).......100
General Specifications .............................................100Disc Brake ...............................................................101
Drum Brake..............................................................101
Brake Pedal .............................................................101
Parking Brake ..........................................................101
CONTENTS(Cont'd)
BR-3

Supplemental Restraint System (SRS) ªAIR
BAGº and ªSEAT BELT PRE-TENSIONERº
NJBR0139The Supplemental Restraint System such as ªAIR BAGº and ªSEAT BELT PRE-TENSIONERº used along with
a seat belt, helps to reduce the risk or severity of injury to the driver and front passenger for certain types of
collision. The SRS system composition which is available to NISSAN MODEL N16 is as follows (The compo-
sition varies according to the destination and optional equipment.):
+For a frontal collision
The Supplemental Restraint System consists of driver air bag module (located in the center of the steer-
ing wheel), front passenger air bag module (located on the instrument panel on passenger side), front seat
belt pre-tensioners, a diagnosis sensor unit, warning lamp, wiring harness and spiral cable.
+For a side collision
The Supplemental Restraint System consists of front side air bag module (located in the outer side of front
seat), side air bag (satellite) sensor, diagnosis sensor unit (one of components of air bags for a frontal
collision), wiring harness, warning lamp (one of components of air bags for a frontal collision).
Information necessary to service the system safely is included in theRS sectionof this Service Manual.
WARNING:
+To avoid rendering the SRS inoperative, which could increase the risk of personal injury or death
in the event of a collision which would result in air bag inflation, all maintenance should be per-
formed by an authorized NISSAN dealer.
+Improper maintenance, including incorrect removal and installation of the SRS, can lead to per-
sonal injury caused by unintentional activation of the system. For removal of Spiral Cable and Air
Bag Module, see the RS section.
+Do not use electrical test equipment on any circuit related to the SRS unless instructed to in this
Service Manual. SRS wiring harnesses can be identified by yellow harness connector.
SBR686C
Precautions for Brake SystemNJBR0002+Recommended fluid is brake fluid ªDOT 4º.
+Never reuse drained brake fluid.
+Be careful not to splash brake fluid on painted areas.
+To clean or wash all parts of master cylinder, disc brake
caliper and wheel cylinder, use clean brake fluid.
+Never use mineral oils such as gasoline or kerosene. They
will ruin rubber parts of the hydraulic system.
+Use flare nut wrench when removing and installing brake
tube.
+Always torque brake lines when installing.
+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 mileage.
Refer to ªBrake Burnishing Procedureº, ªON-VEHICLE
SERVICEº, BR-8.
WARNING:
+Clean brake pads and shoes with a waste cloth, then wipe
with a dust collector.
PRECAUTIONS
Supplemental Restraint System (SRS) ªAIR BAGº and ªSEAT BELT PRE-TENSIONERº
BR-4

System ComponentsNJBR0086
SBR758E
SBR124B
System DescriptionNJBR0087SENSORNJBR0087S01The sensor unit consists of a gear-shaped sensor rotor and a sen-
sor element. The element contains a bar magnet around which a
coil is wound. The sensor is installed on the back side of the brake
rotor. Sine-wave current is generated by the sensor as the wheel
rotates. The frequency and voltage increase(s) as the rotating
speed increases.
SBR759E
CONTROL UNITNJBR0087S02The 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.
SBR176E
ABS ACTUATOR AND ELECTRIC UNITNJBR0087S03The ABS actuator and electric unit contains:
+An electric motor and pump
+Two relays
+Eight solenoid valves, each inlet and outlet for
Ð LH front
Ð RH front
Ð LH rear
Ð RH rear
+ABS control unit
DESCRIPTIONABS
System Components
BR-50