NISSAN X-TRAIL 2003 Service Repair Manual

TROUBLE DIAGNOSIS
BRC-37
[ABS]
C
D
E
G
H
I
J
K
L
MA
B
BRC

Inspection 2: ABS Actuator and Electric Unit (Control Unit) 1EFS004HC
INSPECTION PROCEDURE
1. CHECK SELF-DIAGNOSTIC RESULTS
Check self-diagnostic results.
Is above displayed on self-diagnosis display?
YES >> Replace ABS actuator and electric unit (control unit). Perform self-diagnosis again.
NO >> Inspection End
Inspection 3: ABS Actuator and Electric Unit (Control Unit) Power Supply and
Ground Circuit
EFS004HD
INSPECTION PROCEDURE
1. CHECK SELF-DIAGNOSTIC RESULTS
Check self-diagnostic results.
Is above displayed on self-diagnosis display?
YES >> GO TO 2.
NO >> Inspection End
2. CHECK CONNECTOR
1. Turn ignition switch OFF, disconnect the ABS actuator and electric unit (control unit) connector, and
check the terminal for deformation, disconnection, looseness, and so on. If there is a malfunction, repair
or replace the terminal.
2. Connect the connector securely and perform self-diagnosis again.
OK or NG
OK >> Poor connection of connector terminal
NG >> GO TO 3.
Self-diagnostic results
ABS CONTROLLER
Self-diagnostic results
LOW POWER VOLTAGE

BRC-38
[ABS]
TROUBLE DIAGNOSIS

3. CHECK ABS ACTUATOR AND ELECTRIC UNIT POWER SUPPLY AND GROUND CIRCUIT
1. Turn ignition switch OFF and disconnect ABS actuator and electric unit (control unit) connector.
2. Turn ignition switch ON or OFF, and then check continuity and voltage between each connector terminal
and ground.
OK or NG
OK >> Check battery for terminal looseness, low voltage, etc. If
any malfunction is found, repair malfunctioning parts.
NG >> Corresponding harness circuit malfunctions. Repair cir-
cuit.
Inspection 4: ABS Actuator Relay or ABS Motor Relay Power SystemEFS004HE
INSPECTION PROCEDURE
1. CHECK SELF-DIAGNOSTIC RESULTS
Check the self-diagnostic results.
Is above displayed on self-diagnosis display?
YES >> GO TO 2.
NO >> Inspection End
2. CHECK CONNECTOR
1. Turn ignition switch OFF, disconnect the ABS actuator and electric unit (control unit) connector, and check
the terminal for deformation, disconnection, looseness, and so on. If there is a malfunction, repair or
replace the terminal.
2. Connect the connector securely and perform self-diagnosis again.
OK or NG
OK >> Poor connection of connector terminal
NG >> GO TO 3.
SignalABS actuator and electric
unit (control unit) harness
connector E69GroundMeasure-
ment con-
ditionMeasured
value
Power
supply29 (L)—Ignition
switch ONBattery
voltage
(Approx.
12V)
—Ignition
switch
OFFApprox. 0V
SFIA2019E
SignalABS actuator and electric
unit (control unit) harness
connector E69GroundMeasure-
ment con-
ditionMeasured
value
Ground 16 (B) and 30 (B) —Ignition
switch
OFFContinuity
should
exist.
SFIA2020E
Self-diagnostic results
IN ABS SOL
OUT ABS SOL
MAIN RELAY (ACTUATOR RELAY)
PUMP MOTOR

TROUBLE DIAGNOSIS
BRC-39
[ABS]
C
D
E
G
H
I
J
K
L
MA
B
BRC

3. CHECK ABS ACTUATOR RELAY OR ABS MOTOR RELAY POWER SUPPLY CIRCUIT
1. Turn ignition switch OFF and disconnect ABS actuator and electric unit (control unit) connectors.
2. For the ABS actuator relay, measure voltage between harness
connector E69 terminal 15 (L/W) and ground. For the ABS motor
relay, measure voltage between harness connector E69 terminal
1 (Y) and the ground.
OK or NG
OK >> GO TO 4.
NG >> Circuit malfunction between the battery and ABS actuator and electric unit (control unit). Repair
circuit.
4. CHECK ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT) GROUND CIRCUIT
Check continuity between ABS actuator and electric unit (control
unit) harness connector E69 terminals 16 (B), 30 (B) and ground.
OK or NG
OK >> Replace ABS actuator and electric unit (control unit).
NG >> Open or short in harness. Repair or replace the harness.
Inspection 5: ABS Actuator and Electric Unit (Control Unit) 2EFS004HG
INSPECTION PROCEDURE
1. CHECK SELF-DIAGNOSTIC RESULTS
Check the self-diagnostic results.
Even when “EMERGENCY BRAKE” and any other items are indicated in self-diagnosis display (Note),
replace control unit.
Note: Emergency brake is indicated when the control unit itself detects an internal malfunction.
Is above displayed on self-diagnosis display?
YES >> Replace ABS actuator and electric unit (control unit). Perform self-diagnosis again.
NO >> Inspection EndABS actuator and elec-
tric unit (control unit)
harness connector E69Ground Voltage
1 (Y) — Battery voltage
(Approx. 12V)
15 (L/W) — Battery voltage
(Approx. 12V)
SFIA2021E
ABS actuator and elec-
tric unit (control unit)
harness connector E69Ground Continuity
16 (B) and 30 (B) — Yes
SFIA2022E
Self-diagnostic results
EMERGENCY BRAKE

BRC-40
[ABS]
TROUBLE DIAGNOSIS

Inspection 6: G Sensor SystemEFS004HH
INSPECTION PROCEDURE
1. CHECK SELF-DIAGNOSIS RESULTS
Check the self-diagnostic results.
Is above displayed on self-diagnosis display?
YES >> GO TO 2.
NO >> Inspection End
2. CHECK CONNECTOR
1. Turn ignition switch OFF, disconnect the ABS actuator and electric unit (control unit) and G sensor con-
nector, and check the terminal for deformation, disconnection, looseness, and so on. If there is a malfunc-
tion, repair or replace the terminal.
2. Reconnect connector securely, and perform self-diagnosis.
OK or NG
OK >> Poor connection of connector terminal
NG >> GO TO 3.
3. CHECK CIRCUIT BETWEEN G SENSOR AND ABS ACTUATOR AND ELECTRIC UNIT
1. Turn ignition switch OFF and disconnect G sensor and ABS actuator and electric unit (control unit) con-
nectors.
2. Check continuity between G sensor harness connector M57 and ABS actuator and electric unit (control
unit) harness connector E69.
OK or NG
OK >> GO TO 4.
NG >> Circuit malfunction of G sensor. Repair harness.
Self-diagnostic results
G - SENSOR
G sensor harness
connector M57ABS actuator and electric
unit (control unit) harness
connector E69Measured value
1 (B) 21 (B)
Continuity
should exist. 2 (R/L) 12 (R/L)
3 (PU/W) 10 (PU/W)
4 (SB) 25 (SB)
SFIA2024E

TROUBLE DIAGNOSIS
BRC-41
[ABS]
C
D
E
G
H
I
J
K
L
MA
B
BRC

4. CHECK G SENSOR POWER SUPPLY CIRCUIT
1. Turn ignition switch ON.
2. Check voltage between G sensor harness connector M57 termi-
nal 5 (L) and ground.
OK or NG
OK >> GO TO 5.
NG >> G sensor power supply circuit malfunction. Repair circuit.
5. CHECK G SENSOR
1. Remove G sensor from the vehicle. Refer to BRC-46, "
G SENSOR" .
2. Connect the following terminals between G sensor and connec-
tor.
3. Check voltage between the following G sensor terminals when
ignition switch turns ON and G sensor is in the following condi-
tion.Voltage : Battery voltage (Approx. 12V)
SFIA2025E
G sensor connector Harness connector M57
11 (B)
2 2 (R/L)
5 5 (L)
SFIA2026E
G sensor statusG sensor harness con-
nector M57 terminals 5
(L) - 4 (SB)G sensor harness con-
nector M57 terminals 5
(L) - 3 (PU/W)
Horizontal Approx. 5V Approx. 5V
Longitudinally tilt by
20°Approx. 10V Approx. 10V
Longitudinally tilt by
40°Approx. 5V Approx. 10V
SFIA2027E

BRC-42
[ABS]
TROUBLE DIAGNOSIS

OK or NG
OK >> ABS actuator and electric unit (control unit) malfunction. Replace ABS actuator and electric unit
(control unit).
NG >> G sensor malfunction. Replace G sensor.
Inspection 7: CAN Communication SystemEFS004HI
INSPECTION PROCEDURE
1. CHECK CONNECTOR
1. Turn ignition switch OFF, disconnect the ABS actuator and electric unit (control unit) connector, and check
the terminal for deformation, disconnection, looseness, and so on. If there is a malfunction, repair or
replace the terminal.
2. Reconnect connector to perform self-diagnosis.
Is
“CAN COMM CIRCUIT” displayed in the self-diagnosis display items?
YES >> Print out the self-diagnostic results, and refer to LAN-4, "CAN Communication Unit" .
NO >> Connector terminal connector is loose, damaged, open, or shorted.
Symptom 1: ABS Works FrequentlyEFS004HJ
1. CHECK START
Check longitudinal brake force distribution using a brake tester.
OK or NG
OK >> GO TO 2.
NG >> Check brake system.
2. CHECK FRONT AND REAR AXLE
Check to make sure that there is no excessive play in the front and rear axles. Refer to Front: FAX-7, "
On-
Vehicle Inspection" , Rear: RAX-6, "On-Vehicle Inspection" .
OK or NG
OK >> GO TO 3.
NG >> Repair.
3. CHECK WHEEL SENSOR AND SENSOR ROTOR
Check wheel sensor and sensor rotor for the following.

Sensor installation for damage

Sensor rotor installation for damage

Sensor connector engagement

Sensor harness
OK or NG
OK >> GO TO 4.
NG >>

Replace wheel sensor or sensor rotor.

Repair harness.
4. CHECK ABS WARNING LAMP DISPLAY
Make sure that the warning lamp turns off approximately 1 second after the key switch is turned on or when
driving.
OK or NG
OK >> Normal
NG >> Perform self-diagnosis. Refer to BRC-27, "
SELF-DIAGNOSIS" .

TROUBLE DIAGNOSIS
BRC-43
[ABS]
C
D
E
G
H
I
J
K
L
MA
B
BRC

Symptom 2: Unexpected Pedal ReactionEFS004HK
1. CHECK BRAKE PEDAL STROKE
Check brake pedal stroke. Refer to BR-6, "
On-Vehicle Inspection and Adjustment" .
Is the stroke too large?
YES >>
Bleed air from the brake piping. Refer to BR-9, "Bleeding Brake System" .

Check brake pedal, brake booster, and master cylinder for mount play, looseness, brake sys-
tem fluid leakage, etc. Repair if necessary. Refer to Brake pedal: BR-7, "
Components" , brake
booster and master cylinder: BR-23, "
Removal and Installation" .
NO >> GO TO 2.
2. PERFORMANCE CHECK
Disconnect ABS actuator and electric unit (control unit) connector to deactivate ABS. Check if braking force is
normal in this condition. Connect connector after inspection.
OK or NG
OK >> GO TO 3. Wheel Sensor Inspection in BRC-42, "Symptom 1: ABS Works Frequently" .
NG >> Check brake system.
Symptom 3: Longer Stopping DistanceEFS004HL
CAUTION:
The stopping distance on slippery road surfaces might be longer with the ABS operating than when
the ABS is not operating.
1. PERFORMANCE CHECK
Turn ignition switch OFF. Disconnect ABS actuator and electric unit (control unit) connector to deactivate ABS.
In this condition, check stopping distance. After inspection, connect connector.
OK or NG
OK >> GO TO BRC-42, "Symptom 1: ABS Works Frequently" .
NG >>

Bleed air from the brake piping. Refer to BR-9, "Bleeding Brake System" .

Check brake system.

BRC-44
[ABS]
TROUBLE DIAGNOSIS

Symptom 4: ABS Does Not WorkEFS004HM
CAUTION:
ABS does not operate when speed is 10 km/h or lower.
1. CHECK ABS WARNING LAMP DISPLAY
Make sure that the warning lamp turns off approximately 1 second after the key switch is turned on or when
driving.
OK or NG
OK >> GO TO 3. Check wheel sensor and sensor rotor in BRC-42, "Symptom 1: ABS Works Frequently"
.
NG >> Perform self-diagnosis. Refer to BRC-27, "
SELF-DIAGNOSIS" .
Symptom 5: Pedal Vibration and ABS Operation NoiseEFS004HN
CAUTION:
Under the following conditions, ABS is activated and vibration is felt when brake pedal is lightly
depressed (just place a foot on it). However, this is normal.

When shifting gears

When driving on slippery road

During cornering at high speed

When passing over bumps or grooves (Approx. 50 mm or more)

When pulling away just after starting engine (Approx. 10 km/h or more)
1. SYMPTOM CHECK 1
Check if pedal vibration or operation sounds occur when the engine is started.
OK or NG
OK >> GO TO 2.
NG >> Perform self-diagnosis. Refer to BRC-27, "
SELF-DIAGNOSIS" .
2. SYMPTOM CHECK 2
Check symptoms when electrical component (headlamps, etc.) Switches are operated.
Do symptoms occur?
YES >> Check if there is a radio, antenna, antenna lead wire, or wiring close to the control unit. If there is,
move it farther away.
NG >> GO TO 3. Check wheel sensor and sensor rotor in BRC-42, "
Symptom 1: ABS Works Frequently"
.

WHEEL SENSORS
BRC-45
[ABS]
C
D
E
G
H
I
J
K
L
MA
B
BRC

WHEEL SENSORSPFP:47910
Removal and InstallationEFS004GR
REMOVAL
Pay attention to the following when removing sensor.
CAUTION:

As much as possible, avoid rotating sensor when removing it. Pull sensors out without pulling on
sensor harness.

Take care to avoid damaging sensor edges or rotor teeth. Remove wheel sensor first before
removing front or rear wheel hub. This is to avoid damage to sensor wiring and loss of sensor
function.
INSTALLATION
Pay attention to the following when installing sensor. Tighten installation bolts to specified torques.

When installing, check that there is no foreign material such as iron chips on pick-up and mounting hole of
the sensor. Check that no foreign material has been caught in the sensor rotor. Remove any foreign mate-
rial and clean the mount.

When installing front sensor, be sure to press rubber grommets in until they lock at the three locations
shown in the figure (2 at strut and 1 at body panel). When installed, harness must not be twisted.
SFIA1100E

BRC-46
[ABS]
G SENSOR

G SENSORPFP:47930
Removal and InstallationEFS004GY
CAUTION:
Be careful not to drop or bump G -sensor because it is sensitive to impact.
1. Remove center console. Refer to IP-10, "
INSTRUMENT PANEL
ASSEMBLY" .
2. Disconnect G -sensor connector.
3. Remove mounting nuts and remove G -sensor.
Install in the reverse order of removal observing the precautions
above.
SFIA0065E