2007 INFINITI FX35 steering

TROUBLE DIAGNOSIS BRC-27
[VDC/TCS/ABS]
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Revision: 2006 July 2007 FX35/FX45
FR LH IN ABS SOL
[C1120] Circuit of front LH IN ABS solenoid is open or shorted, or control line is
open or shorted to power supply or ground.
BRC-44, "
Solenoid and VDC
Change-Over Valve Circuit"
FR LH OUT ABS SOL
[C1121] Circuit of front LH OUT ABS solenoid is open or shorted, or control line
is open or shorted to power supply or ground.
FR RH IN ABS SOL
[C1122] Circuit of front RH IN ABS solenoid is open or shorted, or control line is
open or shorted to power supply or ground.
FR RH OUT ABS SOL
[C1123] Circuit of front RH OUT ABS solenoid is open or shorted, or control line
is open or shorted to power supply or ground.
RR LH IN ABS SOL
[C1124] Circuit of rear LH IN ABS solenoid is open or shorted, or control line is
open or shorted to power supply or ground.
RR LH OUT ABS SOL
[C1125] Circuit of rear LH OUT ABS solenoid is open or shorted, or control line
is open or shorted to power supply or ground.
RR RH IN ABS SOL
[C1126] Circuit of rear RH IN ABS solenoid is open or shorted, or control line is
open or shorted to power supply or ground.
RR RH OUT ABS SOL
[C1127] Circuit of rear RH OUT ABS solenoid is open or shorted, or control line
is open or shorted to power supply or ground.
CV1
[C1164] Primary side VDC switch-over solenoid valve 1 (cut valve 1) is open or
shorted, or control line is open or shorted to power supply or ground.
CV2
[C1165] Secondary side VDC switch-over solenoid valve 2 (cut valve 2) is open
or shorted, or control line is open or shorted to power supply or ground.
SV1
[C1166] Primary side VDC switch-over solenoid valve 1 (suction valve 1) is
open or shorted, or control line is open or shorted to power supply or
ground.
SV2
[C1167] Secondary side VDC switch-over solenoid valve 2 (suction valve 2) is
open or shorted, or control line is open or shorted to power supply or
ground.
ACTUATOR RLY
[C1140] (Note 3)

Actuator solenoid valve relay is ON, even if control unit sends off sig-
nal.

Actuator solenoid valve relay is OFF, even if control unit sends on
signal. BRC-45, "
Actuator Motor Cir-
cuit"
PRESS SEN CIRCUIT
[C1142] Pressure sensor signal line is open or shorted, or sensor power volt-
age is unusual, or pressure sensor is malfunctioning. BRC-39, "Pressure Sensor Cir-
cuit"
ST ANG SEN CIRCUIT
[C1143] Neutral position of steering angle sensor is dislocated, or steering
angle sensor is malfunctioning. BRC-41, "Steering Angle Sen-
sor Circuit"
ST ANG SEN SIGNAL
[C1144] Neutral position correction of steering angle sensor is not finished. BRC-6, "Adjustment of Steer-
ing Angle Sensor Neutral Posi-
tion"
YAW RATE SENSOR
[C1145] Yaw rate sensor has generated an error, or yaw rate sensor signal line
is open or shorted. BRC-42, "
Yaw Rate/Side G
Sensor (2WD Models), Yaw
Rate/Side/Decel G Sensor
(AWD Models) Circuit"
SIDE G-SEN CIRCUIT
[C1146] Side G sensor is malfunctioning, or signal line of side G sensor is open
or shorted. BRC-42, "
Yaw Rate/Side G
Sensor (2WD Models), Yaw
Rate/Side/Decel G Sensor
(AWD Models) Circuit"
BR FLUID LEVEL LOW
[C1155] Brake fluid level drops or circuit between ABS actuator and electric unit
(control unit) and brake fluid level switch is open or shorted. BRC-50, "Brake Fluid Level
Switch Circuit"
ST ANG SEN COM CIR
[C1156] CAN communication line or steering angle sensor has generated an
error. BRC-41, "
Steering Angle Sen-
sor Circuit"
BRC-52, "CAN Communication
Circuit"
Self-diagnostic item Malfunction detecting condition Check system

TROUBLE DIAGNOSIS BRC-29
[VDC/TCS/ABS]
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Revision: 2006 July 2007 FX35/FX45
Data MonitorNFS000OJ
OPERATION PROCEDURE
1. After turning ignition switch OFF, perform “CONSULT-II Start Procedure”. Refer to GI-38, "CONSULT-II
Start Procedure" .
2. Turn ignition switch ON.
3. Touch “ABS”, “DATA MONITOR” in order on the CONSULT-II screen. CAUTION:
When “START (NISSAN BASED VHCL)” is touched immediately after starting engine or turning on
ignition switch, “ABS” might not be displayed in the “SELECT SYSTEM” screen. In this case,
repeat the operation from step 1.
4. Return to the Monitor Item Selection screen, and touch “ECU INPUT SIGNALS”, “MAIN SIGNALS” or “SELECTION FROM MENU”. Refer to the following information.
5. When “START” is touched, the data monitor screen is displayed.
DISPLAY ITEM LIST
Item
(Unit) Data monitor item selection
Remarks
ECU INPUT
SIGNALS MAIN
SIGNALS SELECTION
FROM MENU
GEAR ××× Gear position judged by PNP switch signal is displayed.
SLCT LVR POSI ××× Shift position judged by PNP switch signal.
FR RH SENSOR
[km/h (MPH)] ××× Wheel speed calculated by front RH wheel sensor signal is
displayed.
FR LH SENSOR
[km/h (MPH)] ××× Wheel speed calculated by front LH wheel sensor signal is
displayed.
RR RH SENSOR
[km/h (MPH)] ×××
Wheel speed calculated by rear RH wheel sensor signal is
displayed.
RR LH SENSOR
[km/h (MPH)] ××× Wheel speed calculated by rear LH wheel sensor signal is
displayed.
BATTERY VOLT
(V) ××× Voltage supplied to ABS actuator and electric unit (control
unit) is displayed.
ENGINE SPEED
(rpm) ×××
Engine speed judged by CAN communication signal is dis-
played.
DECEL G-SEN
(G) (AWD models) ××× Longitudinal acceleration detected by decel G sensor is dis-
played.
OFF SW
(ON/OFF)
×× × VDC OFF switch (ON/OFF) status is displayed.
STOP LAMP SW
(ON/OFF) ×××
Stop lamp switch (ON/OFF) status is displayed.
YAW RATE SEN
(d/s) ××
– Yaw rate detected by yaw rate sensor is displayed.
ACCEL POS SIG
(%) ×
–– Throttle valve open/close status judged by CAN communica-
tion signal is displayed.
STR ANGLE SIG
(deg) ×
–– Steering angle detected by steering angle sensor is dis-
played.
SIDE G-SENSOR
(m/s
2 ) ×
– – Lateral acceleration detected by side G sensor is displayed.
PRESS SENSOR
(bar) ×
–– Brake fluid pressure detected by pressure sensor is dis-
played.
FLUID LEV SW
(ON/OFF) ×
– – Brake fluid level switch (ON/OFF) status is displayed.
ABS WARN LAMP
(ON/OFF) –
×× ABS warning lamp (ON/OFF) status is displayed.
SLIP LAMP
(ON/OFF) –
×× SLIP indicator lamp (ON/OFF) status is displayed.

TROUBLE DIAGNOSIS BRC-33
[VDC/TCS/ABS]
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Revision: 2006 July 2007 FX35/FX45
For Fast and Accurate DiagnosisNFS000NH
PRECAUTIONS FOR DIAGNOSIS

Before performing diagnosis, always read precautions. Refer to BRC-11, "How to Proceed with Diagnosis"
.

If ABS actuator and electric unit (control unit), steering angle sensor, steering system parts or suspension
system parts have been replaced, or if alignment has been adjusted, be sure to adjust neutral position of
steering angle sensor before driving. Refer to BRC-6, "
Adjustment of Steering Angle Sensor Neutral Posi-
tion" .

After diagnosis is finished, be sure to erase memory. Refer to BRC-25, "Self-Diagnosis" .

When checking continuity and voltage between units, be sure to check for disconnection, looseness,
bend, or collapse of connector terminals. If any malfunction is found, repair or replace connector termi-
nals.

For intermittent symptoms, possible cause is malfunction in harness, harness connector, or terminals.
Move harness, harness connector, and terminals to check for poor connections.

If a circuit tester is used for the check, be careful not to forcibly extend any connector terminal.

To use CONSULT-II to perform self-diagnosis of ABS actuator and electric unit (control unit), active tests,
or work support, first stop work, then connect CONSULT-II and select “ABS”.

While self-diagnostic results of CONSULT-II shows malfunction, if CONSULT-II active test is performed,
an engine system error may be indicated. In this case, start engine to resume the normal screen.

VDC/TCS/ABS system electronically controls brake operation and engine output. The following symptoms
may be caused by normal operations:
Symptom Symptom description Result
Motor operation noise This is noise of motor inside ABS actuator and electric unit (control unit).
Slight noise may occur during VDC, TCS, and ABS operation.
Normal
When the vehicle speed goes over 20 km/h (12.5 MPH), motor and valves
operating noise may be heard. It happens only once after ignition switch is
ON. This is a normal status of the system operation check.
System operation check noise When engine starts, slight “click” noise may be heard from engine room.
This is normal and is part of system operation check. Normal
VDC/TCS operation
(SLIP indicator lamp blinking) TCS may activate momentarily if wheel speed changes when driving over
location where friction coefficient varies, when up/downshifting, or when
fully depressing accelerator pedal.
Normal
Cancel the VDC/TCS
function for the inspec-
tion on a chassis dyna-
mometer.
For inspection of speedometer or other instruments, press VDC OFF
switch to turn VDC/TCS function off.
When accelerator pedal is depressed on a chassis dynamometer (fixed
front-wheel type), vehicle speed will not increase. This is not normal. It is
result of TCS being activated by stationary front wheels. Warning lamp may
also illuminate to indicate “sensor system error”. This is also normal, and is
the result of the stationary front wheels being detected. To be certain,
restart engine, and drive vehicle at 30 km/h (19 MPH) or more. Make sure
warning lamp does not illuminate.
ABS operation
(Longer stopping distance) On roads with low friction coefficients, such as snowy roads or gravel
roads, vehicles with ABS may require a longer stopping distance. There-
fore, when driving on such roads, avoid overconfidence and keep speed
sufficiently low. Normal
Insufficient feeling of acceler-
ation Depending on road conditions, driver may feel that feeling of acceleration
is insufficient. This is because traction control, which controls engine and
brakes to achieve optimal traction, has the highest priority (for safety). As a
result, there may be times when acceleration is slightly less than usual for
the same accelerator pedal operation. Normal

TROUBLE DIAGNOSIS FOR SYSTEM BRC-37
[VDC/TCS/ABS]
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Revision: 2006 July 2007 FX35/FX45
5. CHECK WHEEL SENSOR HARNESS
1. Turn ignition switch OFF and disconnect malfunctioning wheel sensor connector E46 (FR-LH), E33 (FR-RH) or B69 (RR) and
ABS actuator and electric unit (control unit) connector E56.
2. Check continuity between terminals. (Also check the continuity when steering wheel is turned right and left and when sensor
harness inside wheel well is moved.)
OK or NG
OK >> GO TO 6.
NG >> Repair or replace harness and connector that have malfunction.
6. CHECK WHEEL SENSOR POWER SUPPLY CIRCUIT
1. Disconnect malfunctioning wheel sensor connector.
2. Turn ignition switch ON and check voltage between wheel sen- sor harness connector power supply terminal and ground.
OK or NG?
OK >> Replace wheel sensor.
NG >> Replace ABS actuator and electric unit (control unit).
SFIA1186E
Power supply circuit Signal circuit Ground circuit
Wheel ABS actuator
and electric unit (control unit) Wheel sensor ABS actuator
and electric unit (control unit) Wheel sensor ABS actuator and elec-
tric unit (control unit) (signal) ABS actuator and elec-
tric unit (control unit) (ground)
Front RH 34 1 33 2 33, 34
16, 47
Front LH 45 1 46 2 45, 46
Rear RH 43 1 42 2 43, 42
Rear LH 36 3 37 4 36, 37
Power supply circuit : Continuity should exist.
Signal circuit : Continuity should exist.
Ground circuit : Continuity should not exist.
Wheel Wheel sensor Ground Voltage
Front RH 1
—8 V or more
Front LH 1
Rear RH 1
Rear LH 3
SFIA3364E

TROUBLE DIAGNOSIS FOR SYSTEM BRC-41
[VDC/TCS/ABS]
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Revision: 2006 July 2007 FX35/FX45
Steering Angle Sensor CircuitNFS000NN
DTC C1143, C1156
INSPECTION PROCEDURE
1. CHECK SELF-DIAGNOSTIC RESULTS
Check the self-diagnostic results.
Is the above displayed in the self-diagnosis item?
YES >> GO TO 2.
NO >> INSPECTION END
2. CHECK CONNECTOR
1. Disconnect steering angle sensor connector and ABS actuator and electric unit (control unit) connector and check terminals for deformation, disconnection, looseness, and so on. If any malfunction is found,
repair or replace terminal.
2. Reconnect connectors and perform an ABS actuator and electric unit (control unit) self-diagnosis again.
OK or NG
OK >> Connector terminal contact is loose, damaged, open or shorted.
NG >> GO TO 3.
3. CHECK STEERING ANGLE SENSOR HARNESS
1. Check CAN communication circuit. Refer to BRC-52, "
CAN Communication Circuit" .
2. Turn ignition switch OFF and disconnect steering angle sensor connector M14.
3. Check continuity between steering angle sensor harness con- nector and ground.
4. Check voltage between steering angle sensor harness connec- tor and ground.
OK or NG
OK >> GO TO 4.
NG >> If the open or short in harness, repair or replace har- ness.
Self-diagnostic results
ST ANG SEN CIRCUIT
ST ANG SEN COM CIR
Steering angle sensor Ground Continuity 2—Yes
SFIA1189E
Steering angle sensor Ground Voltage
3— Battery voltage
(Approx. 12 V)
SFIA1190E

BRC-42
[VDC/TCS/ABS]
TROUBLE DIAGNOSIS FOR SYSTEM
Revision: 2006 July 2007 FX35/FX45
4. CHECK STEERING WHEEL PLAY
Check steering wheel play. Refer to PS-10, "
CHECKING STEERING WHEEL PLAY" .
OK or NG
OK >> GO TO 5
NG >> Adjust steering wheel play.
5. PERFORM DATA MONITOR
1. Connect steering angle sensor and ABS actuator and electric unit (control unit) connectors.
2. Perform “DATA MONITOR” of the “STEERING ANGLE SIGNAL” to check if the status is normal.
OK or NG
OK >> Perform ABS actuator and electric unit (control unit) self-diagnosis again.
NG >> Replace steering angle sensor and adjust neutral position of steering angle sensor. Refer to BRC-
6, "Adjustment of Steering Angle Sensor Neutral Position" .
Yaw Rate/Side G Sensor (2WD Models), Yaw Rate/Side/Decel G Sensor (AWD
Models) Circuit
NFS000NO
DTC C1113, C1145, C1146
CAUTION:
Sudden turns (such as spin turns, acceleration turns), drifting, etc. may cause the G sensor circuit
indicate a malfunction. However, this is not a malfunction, if normal operation can be resumed after
restarting engine.
INSPECTION PROCEDURE
1. CHECK SELF-DIAGNOSTIC RESULTS
Check the self-diagnostic results.
CAUTION:
When on a turntable, such as at a parking structure entrance, or when on a moving object with engine
running, VDC OFF indicator lamp might turn on and self-diagnosis using CONSULT-II the yaw rate sen-
sor system might be displayed, but in this case there is no malfunction in yaw rate sensor circuit. As
soon as vehicle leaves turntable or moving object, restart engine to return the system to normal.
Is the above displayed in the self-diagnosis display items?
YES >> GO TO 2.
NO >> INSPECTION END
Steering condition Data monitor display
Straight-ahead -3.5 deg - +3.5 deg
Turn wheel to the right by 90 °. Approx. -90 deg
Turn wheel to the left by 90 °. Approx. +90 deg
Self-diagnostic results
YAW RATE SENSOR
SIDE G-SEN CIRCUIT
G-SENSOR (AWD models)

TROUBLE DIAGNOSIS FOR SYSTEM BRC-51
[VDC/TCS/ABS]
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Revision: 2006 July 2007 FX35/FX45
When “ST ANG SEN SIGNAL” Appears on Self-diagnosis Results DisplayNFS000NU
DTC C1144
INSPECTION PROCEDURE
1. CHECK SELF-DIAGNOSTIC RESULTS (1)
Check self-diagnostic results.
Does anything besides
“ST ANG SEN SIGNAL” appear on self-diagnostic results display?
YES >> Inspect and repair the indicated items. Then perform self-diagnosis again.
NO >> Perform adjustment of steering angle sensor neutral position. Then GO TO 2.
2. CHECK SELF DIAGNOSIS RESULTS (2)
Turn ignition switch OFF and ON to erase self-diagnostic results, and perform ABS actuator and electric unit
(control unit) self-diagnosis again.
Does anything appear on self-diagnostic results display?
YES >> Replace steering angle sensor. Then perform adjustment of neutral position and perform self- diagnosis again.
NO >> INSPECTION END
When “DECEL G SEN SET” Appears on Self-diagnostic Results Display (AWD
Models)
NFS000NV
DTC C1160
INSPECTION PROCEDURE
1. CHECK SELF- DIAGNOSTIC RESULTS (1)
Check self-diagnostic results.
Does anything besides
“DECEL G SEN SET” appear on self-diagnostic results display?
YES >> Inspect and repair the indicated items. Then perform self-diagnosis again.
NO >> Perform calibration of decel G sensor. Then GO TO 2.
2. CHECK SELF-DIAGNOSIS RESULTS (2)
Turn ignition switch OFF and ON to erase self-diagnostic results, and perform ABS actuator and electric unit
(control unit) self-diagnosis again.
Does anything appear on self-diagnostic results display?
YES >> Replace yaw rate/side/decel G sensor. Then perform calibration of decel G sensor and perform self-diagnosis again.
NO >> INSPECTION END
Self-diagnostic results
ST ANG SEN SIGNAL
Self-diagnostic results
DECEL G SEN SET

ACTUATOR AND ELECTRIC UNIT (ASSEMBLY) BRC-61
[VDC/TCS/ABS]
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Revision: 2006 July 2007 FX35/FX45
INSTALLATION
Note the following, and install in the reverse order of removal.
CAUTION:
Be careful of the following when installing ABS actuator and electric unit (control unit).

Tighten the mounting bolts and nuts to the specified torque.

After the work, bleed air from brake piping. Refer to BR-10, "Bleeding Brake System" .

After installing vehicle harness connector in the actuator, make sure connector is securely locked.

When replacing ABS actuator and electric unit (control unit), calibrate steering angle sensor neu-
tral position and decel G sensor. Refer to BRC-6, "
ON-VEHICLE SERVICE" .