NISSAN ALMERA TINO 2001 Service Repair Manual

SEF233G
SEF234G
How to Perform Trouble Diagnoses for Quick
and Accurate Repair
NLBR0094INTRODUCTIONNLBR0094S01The ABS system has an electronic control unit to control major
functions. The control unit accepts input signals from sensors and
instantly drives actuator. 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 the booster or 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
replacement of good parts.
A visual check only may not find the cause of the problems, so a
road test should be performed.
Before undertaking actual checks, take just a few minutes to talk
with a customer who approaches with a ABS complaint. The cus-
tomer is a very good source of information on such problems;
especially intermittent 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”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.
TROUBLE DIAGNOSIS—INTRODUCTIONABS
How to Perform Trouble Diagnoses for Quick and Accurate Repair
BR-64

Preliminary CheckNLBR0095
1 CHECK BRAKE FLUID LEVEL
Check brake fluid level in reservoir tank.
Low fluid level may indicate brake pad wear or leakage from brake line.
NBR376
Is brake fluid filled between MAX and MIN lines on reservoir tank and/or has brake fluid been contaminated?
Ye s©GO TO 2.
No©Repair. GO TO 2.
2 CHECK BRAKE LINE
Check brake line for leakage.
SBR389C
Is leakage present at or around brake lines, tubes or hoses or are any of these parts cracked or damaged?
Ye s©GO TO 3.
No©Repair. GO TO 3.
TROUBLE DIAGNOSIS—BASIC INSPECTIONABS
Preliminary Check
BR-65

3 CHECK BRAKE BOOSTER OPERATION
Check brake booster for operation and air tightness.
Refer to BR-16.
SBR058C
Is brake booster airtight and functioning properly?
Ye s©GO TO 4.
No©Replace. GO TO 4.
4 CHECK BRAKE PAD AND ROTOR
Check brake pad and rotor.
Refer to BR-24, 26, 28, 32.
SBR059C
Are brake pads and rotors functioning properly?
Ye s©GO TO 5.
No©Replace.
TROUBLE DIAGNOSIS Ð BASIC INSPECTIONABS
Preliminary Check (Cont'd)
BR-66

5 RECHECK BRAKE FLUID LEVEL
Check brake fluid level in reservoir tank again.
NBR376
Is brake fluid filled between MAX and MIN lines on reservoir tank and/or has brake fluid been contaminated?
Ye s©GO TO 6.
No©Fill up brake fluid.
6 CHECK WARNING LAMP ACTIVATION
Check warning lamp activation.
SBR759E
Does warning lamp turn on when ignition switch is turned“ON”?
Ye s©GO TO 7.
No©Check fuse, warning lamp bulb and warning lamp circuit.
7 CHECK WARNING LAMP DEACTIVATION
Check warning lamp for deactivation after engine is started.
Does warning lamp turn off when engine is started?
Ye s©GO TO 8.
No©Go to Self-diagnosis. Refer to BR-56, 58.
8 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?
Ye s©END
No©Go to Self-diagnosis. Refer to BR-56, 58.
TROUBLE DIAGNOSIS—BASIC INSPECTIONABS
Preliminary Check (Cont’d)
BR-67

SBR045EH
Ground Circuit CheckNLBR0096ABS ACTUATOR AND ELECTRIC UNIT GROUNDNLBR0096S04+Check continuity between ABS actuator and electric unit con-
nector terminals and ground.
Continuity should exist.
TROUBLE DIAGNOSIS—BASIC INSPECTIONABS
Ground Circuit Check
BR-68

Malfunction Code/Symptom ChartNLBR0097MODELS WITH SELF-DIAGNOSIS FUNCTION (DATA LINK CONNECTOR TERMINAL NO. 9)NLBR0097S01
Code No. (No. of LED flashes) Malfunctioning part Reference page
12 Self-diagnosis could not detect any malfunctions.—
18 Sensor rotor BR-71
21 Front right sensor (open-circuit) BR-71
22 Front right sensor (short-circuit) BR-71
25 Front left sensor (open-circuit) BR-71
26 Front left sensor (short-circuit) BR-71
31 Rear right sensor (open-circuit) BR-71
32 Rear right sensor (short-circuit) BR-71
35 Rear left sensor (open-circuit) BR-71
36 Rear left sensor (short-circuit) BR-71
41 Actuator front right outlet solenoid valve BR-74
42 Actuator front right inlet solenoid valve BR-74
45 Actuator front left outlet solenoid valve BR-74
46 Actuator front left inlet solenoid valve BR-74
51 Actuator rear right outlet solenoid valve BR-74
52 Actuator rear right inlet solenoid valve BR-74
55 Actuator rear left outlet solenoid valve BR-74
56 Actuator rear left inlet solenoid valve BR-74
57* Power supply (Low voltage) BR-79
61 Actuator motor or motor relay BR-77
63 Solenoid valve relay BR-74
71 Control unit BR-81
ABS warning lamp stays on when
ignition switch is turned on.Control unit power supply circuit
Warning lamp bulb circuit
Control unit or control unit connector
Solenoid valve relay stuck
Power supply for solenoid valve relay coilBR-88
ABS warning lamp stays on, during
self-diagnosis.Control unit—
ABS warning lamp does not come on
when ignition switch is turned on.Fuse, warning lamp bulb or warning lamp circuit
Control unitBR-86
ABS warning lamp does not come on
during self-diagnosis.Control unit—
Pedal vibration and noise—BR-85
Long stopping distance—BR-83
Unexpected pedal action—BR-82
ABS does not work.—BR-84
ABS works frequently.—BR-82
*: Under voltage that is too low, the control unit disable the ABS. It does not set the ABS in fail-safe condition. Instead, the ABS becomes
TROUBLE DIAGNOSIS—GENERAL DESCRIPTIONABS
Malfunction Code/Symptom Chart
BR-69

a conventional brake system. After the power supply has resumed, the warning lamp goes off, making it possible for the ABS to be re-
engaged.
TROUBLE DIAGNOSIS—GENERAL DESCRIPTIONABS
Malfunction Code/Symptom Chart (Cont’d)
BR-70

Wheel Sensor or RotorNLBR0098DIAGNOSTIC PROCEDURENLBR0098S01(Malfunction code No. 21, 22, 25, 26, 31, 32, 35, 36 or 18 for
models with self-diagnosis function)
NOTE:
Wheel position should be identified by code No. except code No.
18 (sensor rotor).
1 INSPECTION START
Wheel sensor inspection
NBR377
©GO TO 2.
2 CHECK CONNECTOR
1. Disconnect connectors from control unit and wheel sensor of malfunction code No. Check terminals for damage or
loose connections. Then reconnect connectors.
2. Carry out self-diagnosis again.
Does warning lamp activate again?
Ye s©GO TO 3.
No©INSPECTION END
TROUBLE DIAGNOSES FOR SELF-DIAGNOSTIC ITEMSABS
Wheel Sensor or Rotor
BR-71

3 CHECK WHEEL SENSOR CIRCUIT
1. Disconnect control unit connector.
2. Check resistance between control unit connector terminals.
Code No. 21 or 22 (Front RH wheel)
Terminals 4 and 5
Code No. 25 or 26 (Front LH wheel)
Terminals 6 and 7
Resistance: 1.44 - 1.76 kΩ
Code No. 31 or 32 (Rear RH wheel)
Terminals 1 and 3
Code No. 35 or 36 (Rear LH wheel)
Terminals 8 and 9
Resistance: 1.05 - 1.35 kΩ
SBR477EC
Is resistance 1.44 - 1.76 kΩ(FR) or 1.05 - 1.35 kΩ(RR)?
Ye s©GO TO 5.
No©GO TO 4.
4 CHECK WHEEL SENSOR
Check resistance of each sensor. (See NOTE.)
Resistance: 1.44 - 1.76 kΩ(FR)
Resistance: 1.05 - 1.35 kΩ(RR)
NBR378
Is resistance 1.44 - 1.76 kΩ(FR) or 1.05 - 1.35 kΩ(RR)?
Ye s©Repair harness and connectors between control unit connector and wheel sensor con-
nector.
No©Replace wheel sensor.
5 CHECK TIRE
Check for inflation pressure, wear and size of each tire.
Are tire pressure and size correct and is tire wear within specifications?
Ye s©GO TO 6.
No©Adjust tire pressure or replace tire(s).
TROUBLE DIAGNOSES FOR SELF-DIAGNOSTIC ITEMSABS
Wheel Sensor or Rotor (Cont’d)
BR-72

6 CHECK WHEEL BEARING
Check wheel bearing axial end play.
Check clearance between sensor and rotor.
Clearance:
Front
0.175 - 0.875 mm (0.007 - 0.034 in)
Rear
0.308 - 0.966 mm (0.012 - 0.0380 in)
SBR333E
SBR069CA
Is axial end play and clearance within specifications?
Ye s©GO TO 7.
No©Clean sensor fixing portion, or replace sensor.
7 CHECK SENSOR ROTOR
Check sensor rotor for teeth damage.
Is sensor rotor free from damage?
Ye s©Check control unit pin terminals for damage or the connection of control unit harness
connector. Reconnect control unit harness connector. Then retest.
No©Replace sensor rotor.
TROUBLE DIAGNOSES FOR SELF-DIAGNOSTIC ITEMSABS
Wheel Sensor or Rotor (Cont’d)
BR-73