unit NISSAN TERRANO 2002 Service Owner's Manual

ACTUATOR AND ELECTRIC UNIT
The actuator and electric unit contains:
IAn electric motor and pump
ITwo relays
ISix solenoid valves, each inlet and outlet for
Ð LH front
Ð RH front
Ð Rear
IABS control unit
These components control the hydraulic circuit. The ABS control
unit directs the actuator to increase, hold or decrease hydraulic
pressure to all or individual wheels. The ABS actuator and electric
unit cannot be disassembled and has to be serviced as an assem-
bly.
YBR299
ANTI-LOCK BRAKE SYSTEM
System Description (Cont'd)
BR-40

REAR SENSOR ROTOR
Removal
IRemove the sensor rotor using Tool.
Installation
Install the sensor rotor using suitable drift and press.
IAlways replace sensor rotor with new one.
IPay attention to the direction of front sensor rotor as shown in
figure.
CONTROL UNIT
Location: Built-in ABS actuator.
When disconnecting the harness connector, pull the lever as
shown in figure.
G SENSOR
Always replace G sensor if bumped or dropped. Otherwise,
performance characteristics of G sensor will be changed,
which in turn alters ABS control performance characteristics.
SBR401D
SBR402D
NBR212
NBR127
ANTI-LOCK BRAKE SYSTEM
Removal and Installation (Cont'd)
BR-44

ACTUATOR
Removal
1. Disconnect battery cable.
2. Drain brake fluid. Refer to BR-5.
3. Unlock the slider then disconnect the electrical harness con-
nectors from ABS control unit.
4. Identify each brake pipe with corresponding actuator port hole
and mark them accordingly.
5. Disconnect brake pipes and move them away from actuator. Do
not force brake pipes so as to kink them or bend them exces-
sively.
Ensure that brake fluid does not come into contact with
any parts.
YBR299
ANTI-LOCK BRAKE SYSTEM
Removal and Installation (Cont'd)
BR-45

6. Loosen/remove mounting nuts between actuator and bracket.
Installation
CAUTION:
After installation, pay attention to the following points:
IRefill brake fluid and bleed air. Refer to ªCHECK AND
ADJUSTMENTº, BR-5 and ªBleeding Brake Systemº,
ªBRAKE HYDRAULIC LINEº, BR-8, respectively.
1. Install actuator on bracket without tightening fixings.
2. Assemble brake tubes to actuator without tightening tube nuts.
Ensure that correct tubes are connected to each port.
3. Fully tighten actuator and bracket fixings to specified torque.
4. Fully tighten flare nuts to specified torque, BR-9.
5. Secure ABS control unit harness connector and battery cable.
ANTI-LOCK BRAKE SYSTEM
Removal and Installation (Cont'd)
BR-46

How to Perform Trouble Diagnoses for Quick
and Accurate Repair
INTRODUCTION
The ABS system has an electronic control unit to control major
functions. The control unit accepts input signals from sensors and
uses this data to compute control characteristics to instantly drive
the actuators. It is essential that both kinds of signal are accurate
and stable. It is also important to check for conventional brake
system 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 catastrophically. 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 may not be sufficient to determine the cause of the
problems, so a road test should also be conducted.
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. Through the talks with the customer, find out what
symptoms are present and under what conditions they occur.
Start your diagnosis by looking for ªconventionalº problems first.
This is one of the best ways to troubleshoot brake problems on an
ABS controlled vehicle.
SEF233G
SEF234G
TROUBLE DIAGNOSES
BR-47

CONSULT-II
CONSULT-II APPLICATION TO ABS
ITEMSELF-DIAGNOSTIC
RESULTSDATA MONITOR ACTIVE TEST
Front right wheel sensor X X Ð
Front left wheel sensor X X Ð
Rear right wheel sensor X X Ð
Rear left wheel sensor X X Ð
G switch (G sensor) X X X
Stop lamp switch Ð X Ð
Front right inlet solenoid valve X X X
Front right outlet solenoid valve X X X
Front left inlet solenoid valve X X X
Front left outlet solenoid valve X X X
Rear inlet solenoid valve X X X
Rear outlet solenoid valve X X X
Actuator solenoid valve relay X X Ð
Actuator motor relay
(ABS MOTOR is shown on the Data Monitor
screen.)XXX
ABS warning lamp Ð X Ð
Brake warning lamp Ð X Ð
Battery voltage X X Ð
ABS Operating Signal Ð Ð Ð
X: Applicable
Ð: Not applicable
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.
TROUBLE DIAGNOSES
BR-58

CONSULT-II Inspection Procedure
SELF-DIAGNOSIS PROCEDURE
1) Turn ignition switch to OFF position.
2) Connect CONSULT-II to Data Link Con-
nector.
1) Start engine.
2) Drive vehicle over 30 km/h (19 MPH)
for at least one minute.
1) Stop vehicle with engine running
and touch ªSTARTº on CON-
SULT-II screen.
2) Touch ªABSº.
3) Touch ªSELF-DIAG RESULTSº.
IThe screen shows the detected malfunc-
tion and how many times the ignition
switch has been turned since the mal-
function.
Make the necessary repairs following the
diagnostic procedures.
After the malfunctions are repaired, erase
the self-diagnostic results stored in the
control unit by touching ªERASEº.
Check warning lamp(s) for deactivation
after driving vehicle over 30 km/h (19
MPH) for at least one minute.
Test the ABS system in a safe area to
verify that it functions properly.
END
Note: ªSELF-DIAG RESULTSº screen shows the detected malfunction and
how many times the ignition switch has been turned since the mal-
function.
YBR265
C2NCS01
C2SSE01
C2SDM01
C2SDR01
H
H
H
H
H
H
H
TROUBLE DIAGNOSES
BR-59

SELF-DIAGNOSTIC RESULTS MODE
Diagnostic item Diagnostic item is detected when...Diagnostic
procedure
FR RH SENSORH
[OPEN]ICircuit for front right wheel sensor is open.
(An abnormally high input voltage is entered.)4
FR LH SENSORH
[OPEN]ICircuit for front left wheel sensor is open.
(An abnormally high input voltage is entered.)4
RR RH SENSORH
[OPEN]ICircuit for rear right sensor is open.
(An abnormally high input voltage is entered.)4
RR LH SENSORH
[OPEN]ICircuit for rear left sensor is open.
(An abnormally high input voltage is entered.)4
FR RH SENSORH
[SHORT]ICircuit for front right wheel sensor is shorted.
(An abnormally low input voltage is entered.)4
FR LH SENSORH
[SHORT]ICircuit for front left wheel sensor is shorted.
(An abnormally low input voltage is entered.)4
RR RH SENSORH
[SHORT]ICircuit for rear right sensor is shorted.
(An abnormally low input voltage is entered.)4
RR LH SENSORH
[SHORT]ICircuit for rear left sensor is shorted.
(An abnormally low input voltage is entered.)4
ABS SENSORH
[ABNORMAL SIGNAL]ITeeth damage on sensor rotor or misalignment of wheel sensor.
(Abnormal wheel sensor signal is entered.)4
FR RH IN ABS SOL
[OPEN, SHORT]ICircuit for front right inlet solenoid valve is open or shorted.
(An abnormally low output voltage is entered.)3
FR LH IN ABS SOL
[OPEN, SHORT]ICircuit for front left inlet solenoid valve is open or shorted.
(An abnormally low output voltage is entered.)3
FR RH OUT ABS SOL
[OPEN, SHORT]ICircuit for front right outlet solenoid valve is open or shorted.
(An abnormally low output voltage is entered.)3
FR LH OUT ABS SOL
[OPEN, SHORT]ICircuit for front left outlet solenoid valve is open or shorted.
(An abnormally low output voltage is entered.)3
RR IN ABS SOL
[OPEN, SHORT]ICircuit for rear right outlet solenoid valve is open or shorted.
(An abnormally high output voltage is entered.)3
RR OUT ABS SOL
[OPEN, SHORT]ICircuit for rear left outlet solenoid valve is open or shorted.
(An abnormally high output voltage is entered.)3
ABS ACTUATOR RELAY
[ABNORMAL]IActuator solenoid valve relay is ON, even if control unit sends OFF signal.
IActuator solenoid valve relay is OFF, even if control unit sends ON signal.6
ABS MOTOR RELAY
[ABNORMAL]ICircuit for ABS motor relay is open or shorted.
ICircuit for actuator motor is open or shorted.
IActuator motor relay is stuck.5
BATTERY VOLT
[VB-LOW]IPower source voltage supplied to ABS control unit is abnormally low. 7
CONTROL UNITIFunction of calculation in ABS control unit has failed. 9
G-SENSOR
[ABNORMAL]IG sensor is open.8
HIf a tire slips on rough roads for more than 10 seconds, the ABS warning lamp may come on. In this case, the malfunctioning code
regarding the wheel sensors may be memorized. Turn off the ignition switch, restart the engine and drive the vehicle at speeds
above 30 km/h (19 MPH).
TROUBLE DIAGNOSES
CONSULT-II Inspection Procedure (Cont'd)
BR-60

DATA MONITOR MODE
MONITOR ITEM CONDITION SPECIFICATION
FR RH SENSOR
FR LH SENSOR
REAR RH SENSOR
REAR LH SENSORDrive vehicle.
(Each wheel is rotating.)Wheel speed signal
Almost the same speed as speedometer.
STOP LAMP SW Brake is depressed.Depress the pedal: ON
Release the pedal: OFF
G-SWITCHVehicle is driven.
Vehicle is stopped.
Brake is applied.When driving or stopping vehicle with a force of less than 0.3G:
ON
When driving or stopping vehicle with a force of 0.3G or more:
OFF
FR RH IN SOL
FR RH OUT SOL
FR LH IN SOL
FR LH OUT SOL
RR IN SOL
RR OUT SOL1. Drive vehicle at speeds over
30 km/h (19 MPH) for at
least one minute.
2. Engine is running.Operating conditions for each solenoid valve are indicated.
ABS is not operating: OFF
MOTOR RELAYABS is not operating: OFF
ABS is operating: ON
ACTUATOR RELAY
Ignition switch is set to the
ªONº position or engine is run-
ning.Ignition switch in the ªONº position (Engine stops): OFF
Engine running: ON
WARNING LAMPWarning lamp is turned on: ON
Warning lamp is turned off: OFF
BATTERY VOLT Power supply voltage for control unit
TROUBLE DIAGNOSES
CONSULT-II Inspection Procedure (Cont'd)
BR-62

Ground Circuit Check
ABS CONTROL UNIT GROUND
ICheck resistance between ABS actuator and electric unit con-
nector terminals and ground.
Resistance: approximately 0W
NBR321
TROUBLE DIAGNOSES
BR-66