control unit INFINITI M35 2007 Factory Service Manual

BRC-46
[VDC/TCS/ABS]
TROUBLE DIAGNOSIS FOR SYSTEM
Revision: 2007 April2007 M35/M45
Brake Fluid Level Switch CircuitNFS000QW
CAUTION:
Check brake fluid level in brake reservoir tank before starting inspection.
INSPECTION PROCEDURE
1. CHECK SELF-DIAGNOSIS RESULTS
1. Check brake fluid level in brake reservoir tank. If brake fluid level is low, refill brake fluid.
2. Check self-diagnosis results.
Is above displayed on the self-diagnosis display?
YES >> GO TO 2.
NO >> INSPECTION END
2. CHECK CONNECTOR
1. Turn ignition switch OFF and disconnect brake fluid level switch connector E23 and ABS actuator and
electric unit (control unit) connector E30, check terminal for deformation, disconnection, looseness, and
so on. If any malfunction is found, repair or replace terminal.
2. Reconnect connector and perform self-diagnosis.
OK or NG
OK >> INSPECTION END
NG >> GO TO 3.
3. CHECK BRAKE FLUID LEVEL SWITCH
1. Turn ignition switch OFF and disconnect brake fluid level switch
connector E23.
2. Check continuity between brake fluid level switch connector E23
terminal 1 and 2.
OK or NG
OK >> GO TO 4.
NG >>

Brake fluid level switch is malfunctioning. Replace reservoir tank. Refer to BR-14, "BRAKE
MASTER CYLINDER" .

Perform the self-diagnosis, and make sure that the result shows “NO DTC IS DETECTED”.
Self-diagnosis results
BR FLUID LEVEL LOW
Brake fluid level switch Condition Continuity
1, 2When brake fluid is full in the reservoir tank No
When brake fluid is empty in the reservoir
tankYe s
SFIA2966E

TROUBLE DIAGNOSIS FOR SYSTEM
BRC-47
[VDC/TCS/ABS]
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Revision: 2007 April2007 M35/M45
4. CHECK BRAKE FLUID LEVEL SWITCH HARNESS
1. Disconnect ABS actuator and electric unit (control unit) connec-
tor E30.
2. Check continuity between brake fluid level switch harness con-
nector E23 and ABS actuator and electric unit (control unit) har-
ness connector E30.
OK or NG
OK >> Connect connector securely and perform self-diagnosis.
NG >>

Repair or replace malfunctioning components.

Perform the self-diagnosis, and make sure that the
result shows “NO DTC IS DETECTED”.
RAS Control Unit Circuit (With RAS)NFS000QX
INSPECTION PROCEDURE
1. CHECK SELF-DIAGNOSIS RESULTS
Check self-diagnosis results.
Is above displayed on the self-diagnosis display?
YES >> GO TO 2.
NO >> INSPECTION END
2. CHECK RAS CONTROL UNIT CIRCUIT
1. Perform RAS control unit self-diagnosis. Repair or replace items indicated, then perform RAS control unit
self-diagnosis again. Refer to STC-31, "
SELF-DIAGNOSIS PROCEDURE" .
2. Perform ABS actuator and electric unit (control unit) self-diagnosis.
OK or NG
OK >> INSPECTION END
NG >>

Repair or replace malfunctioning components.

Perform the self-diagnosis, and make sure that the result shows “NO DTC IS DETECTED”.
ABS actuator and electric unit (control unit) Brake fluid level switch Continuity
431Yes
Ground No
Ground 2 Yes
SFIA3046E
Self-diagnosis results
RAS CIRCUIT

BRC-48
[VDC/TCS/ABS]
TROUBLE DIAGNOSIS FOR SYSTEM
Revision: 2007 April2007 M35/M45
ICC Sensor Integrated Unit Circuit (With ICC)NFS000QY
INSPECTION PROCEDURE
1. CHECK SELF-DIAGNOSIS RESULTS
Check self-diagnosis results.
Is above displayed on the self-diagnosis display?
YES >> GO TO 2.
NO >> INSPECTION END
2. CHECK ICC SENSOR INTEGRATED UNIT CIRCUIT
1. Perform ICC sensor integrated unit self-diagnosis. Repair or replace items indicated, then perform ICC
sensor integrated unit self-diagnosis again. Refer to ACS-29, "
TROUBLE DIAGNOSIS - GENERAL
DESCRIPTION" .
2. Perform ABS actuator and electric unit (control unit) self-diagnosis.
OK or NG
OK >> INSPECTION END
NG >>

Repair or replace malfunctioning components.

Perform the self-diagnosis, and make sure that the result shows “NO DTC IS DETECTED”.
CAN Communication CircuitNFS000R0
INSPECTION PROCEDURE
1. CHECK CONNECTOR
1. Turn ignition switch OFF and disconnect ABS actuator and electric unit (control unit) connector E30,
check terminal for deformation, disconnection, looseness, and so on. If any malfunction is found, repair or
replace terminal.
2. Reconnect connector and perform self-diagnosis.
Note: Indicated only for vehicles with ICC.
Is above displayed on the self-diagnosis display?
YES >> Print out self-diagnosis results and go to Refer to LAN-50, "CAN System Specification Chart" .
NO >> INSPECTION END
Self-diagnosis results
ACC CONT
Self-diagnosis results
CAN COMM CIRCUIT
ST ANG SEN COM CIR
ACC COMM CIRCUIT (Note)

TROUBLE DIAGNOSIS FOR SYSTEM
BRC-49
[VDC/TCS/ABS]
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Revision: 2007 April2007 M35/M45
VDC OFF Switch CircuitNFS000R1
INSPECTION PROCEDURE
1. CHECK VDC OFF SWITCH
1. Turn ignition switch OFF and disconnect VDC OFF switch con-
nector M24.
2. Check continuity between VDC OFF switch connector M24 ter-
minal 1 and 2.
OK or NG
OK >> GO TO 2.
NG >> VDC OFF switch is malfunctioning. Replace VDC OFF
switch.
2. CHECK VDC OFF SWITCH HARNESS
1. Disconnect ABS actuator and electric unit (control unit) connec-
tor E30.
2. Check continuity between VDC OFF switch connector M24 and
ABS actuator and electric unit (control unit) connector E30.
OK or NG
OK >> INSPECTION END
NG >> Repair or replace malfunctioning components.
VDC OFF switch Condition Continuity
1, 2VDC OFF switch ON Yes
VDC OFF switch OFF No
SFIA2409E
ABS actuator and electric unit (control unit) VDC OFF switch Continuity
311Yes
Ground No
Ground 2 Yes
SFIA3047E

BRC-50
[VDC/TCS/ABS]
TROUBLE DIAGNOSIS FOR SYSTEM
Revision: 2007 April2007 M35/M45
Parking Brake Switch CircuitNFS000R2
INSPECTION PROCEDURE
1. CHECK PARKING BRAKE SWITCH
1. Turn ignition switch OFF and disconnect parking brake switch
connector E110.
2. Check continuity between parking brake switch connector E110
and ground.
OK or NG
OK >> GO TO 2.
NG >> Parking brake switch is malfunctioning. Replace parking
brake switch.
2. CHECK PARKING BRAKE SWITCH HARNESS
1. Disconnect ABS actuator and electric unit (control unit) connec-
tor E30.
2. Check continuity between parking brake switch connector E110
and ABS actuator and electric unit (control unit) connector E30.
OK or NG
OK >> INSPECTION END
NG >> Repair or replace malfunctioning components.
Warning Lamp and Indicator Lamp CircuitNFS000R3
INSPECTION PROCEDURE
1. CHECK SELF-DIAGNOSIS RESULTS
Perform ABS actuator and electric unit (control unit) self-diagnosis.
OK or NG
OK >> GO TO 2.
NG >> Check items displayed by self-diagnosis. Refer to BRC-24, "
Self-Diagnosis" .
2. CHECK COMBINATION METER
Check the indication and operation of combination meter are normal. Refer to DI-17, "
Self-Diagnosis Mode of
Combination Meter" .
OK or NG
OK >> INSPECTION END
NG >> Combination meter is malfunctioning. Repair or replace combination meter. Refer to DI-5, "
COM-
BINATION METERS" .
Condition Continuity
When the parking brake pedal is operated Yes
When the parking brake pedal is not operated No
SFIA2935E
ABS actuator and electric unit (control unit) Parking brake switch Continuity
361Yes
Ground No
SFIA3048E

TROUBLE DIAGNOSIS FOR SYMPTOMS
BRC-51
[VDC/TCS/ABS]
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Revision: 2007 April2007 M35/M45
TROUBLE DIAGNOSIS FOR SYMPTOMSPFP:00007
Excessive ABS Function Operation FrequencyNFS000R4
1. CHECK START
Check front and rear brake force distribution using a brake tester. Refer to BR-34, "
SERVICE DATA AND
SPECIFICATIONS (SDS)" .
OK or NG
OK >> GO TO 2.
NG >> Check brake system.
2. CHECK FRONT AND REAR AXLE
Make sure that there is no excessive play in the front and rear axles. Refer to front: FAX-5, "
WHEEL BEAR-
ING INSPECTION" , Rear: RAX-5, "WHEEL BEARING INSPECTION" .
OK or NG
OK >> GO TO 3.
NG >> Repair or replace malfunctioning components.
3. CHECK WHEEL SENSOR AND SENSOR ROTOR
Check the following.

Wheel sensor installation for damage.

Sensor rotor installation for damage.

Wheel sensor connector connection.

Wheel sensor harness inspection.
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 ABS warning lamp is turned off after the ignition switch is turned ON or when driving.
OK or NG
OK >> Normal
NG >> Perform self-diagnosis. Refer to BRC-24, "
Self-Diagnosis" .
Unexpected Pedal ReactionNFS000R5
1. CHECK BRAKE PEDAL STROKE
Check brake pedal stroke. Refer to BR-6, "
Inspection and Adjustment" .
Is the stroke too big?
YES >>
Bleed air from brake tube and hose. Refer to BR-10, "Bleeding Brake System" .

Check brake pedal, brake booster, and master cylinder for mount play, looseness, brake sys-
tem fluid leakage, etc. Refer to brake pedal: BR-7, "
COMPONENTS" , brake booster and mas-
ter cylinder: BR-18, "
COMPONENTS" .
NO >> GO TO 2.
2. CHECK FUNCTION
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 procedure 3 “CHECK WHEEL SENSOR AND SENSOR ROTOR”. Refer to BRC-51,
"Excessive ABS Function Operation Frequency" .
NG >> Check brake system.

BRC-52
[VDC/TCS/ABS]
TROUBLE DIAGNOSIS FOR SYMPTOMS
Revision: 2007 April2007 M35/M45
The Braking Distance Is LongNFS000R6
CAUTION:
The stopping distance on slippery road surfaces might be longer with the ABS operating than when
the ABS is not operating.
1. CHECK FUNCTION
Turn ignition switch OFF and 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 procedure 3 “CHECK WHEEL SENSOR AND SENSOR ROTOR”. Refer to BRC-51,
"Excessive ABS Function Operation Frequency" .
NG >> Check brake system.
ABS Function Does Not OperateNFS000R7
CAUTION:
ABS does not operate when speed is 10 km/h (6 MPH) or lower.
1. CHECK ABS WARNING LAMP DISPLAY
Make sure that the ABS warning lamp turns OFF after ignition switch is turned on or when driving.
OK or NG
OK >> GO TO procedure 3 “CHECK WHEEL SENSOR AND SENSOR ROTOR”. Refer to BRC-51,
"Excessive ABS Function Operation Frequency" .
NG >> Perform self-diagnosis. Refer to BRC-24, "
Self-Diagnosis" .
Pedal Vibration or ABS Operation Sound OccursNFS000R8
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 [at approximately 50 mm (1.97 in) or more]

When pulling away just after starting engine [at approximately 10 km/h (6 MPH) or higher]
1. SYMPTOM CHECK 1
Check if there is pedal vibration or operation sound when the engine is started.
Do symptoms occur?
YES >> GO TO 2.
NO >> Perform self -diagnosis. Refer to BRC-24, "
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.
NO >> GO TO procedure 3 “CHECK WHEEL SENSOR AND SENSOR ROTOR”. Refer to BRC-51,
"Excessive ABS Function Operation Frequency" .

TROUBLE DIAGNOSIS FOR SYMPTOMS
BRC-53
[VDC/TCS/ABS]
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Revision: 2007 April2007 M35/M45
Vehicle Jerks During VDC/TCS/ABS ControlNFS000R9
1. SYMPTOM CHECK
Check if the vehicle jerks during VDC/TCS/ABS control.
OK or NG
OK >> Normal.
NG >> GO TO 2.
2. CHECK SELF-DIAGNOSIS RESULTS
Perform self-diagnostic of ABS actuator and electric unit (control unit).
Are self-diagnosis results indicated?
YES >> Check corresponding items, make repairs, and perform ABS actuator and electric unit (control
unit) self-diagnosis.
NO >> GO TO 3.
3. CHECK CONNECTOR

Turn ignition switch OFF and disconnect ABS actuator and electric unit (control unit) connector and check
terminal for deformation, disconnection, looseness, etc.

Securely connect connectors and perform ABS actuator and electric unit (control unit) self-diagnosis.
Are self-diagnosis results indicated?
YES >> If poor contact, damage, open or short circuit of connector terminal is found, repair or replace.
NO >> GO TO 4.
4. CHECK ECM AND TCM SELF-DIAGNOSIS RESULTS
Perform ECM and TCM self-diagnosis.
Are self-diagnosis results indicated?
YES >> Check the corresponding items.

ECM: Refer to EC-90, "TROUBLE DIAGNOSIS" (VQ35DE), EC-792, "TROUBLE DIAGNOSIS"
(VK45DE).

TCM: Refer to AT- 4 4 , "TROUBLE DIAGNOSIS" .
NO >> Replace ABS actuator and electric unit (control unit).

ACTUATOR AND ELECTRIC UNIT (ASSEMBLY)
BRC-57
[VDC/TCS/ABS]
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Revision: 2007 April2007 M35/M45
ACTUATOR AND ELECTRIC UNIT (ASSEMBLY)PFP:47660
Removal and InstallationNFS000RC
COMPONENT
CAUTION:
Be careful of the following.

Before servicing, disconnect the battery cable from negative terminal.

To remove brake tube, use a flare nut wrench to prevent flare nuts and brake tube from being dam-
aged. To install, use flare nut torque wrench.

Do not apply excessive impact to ABS actuator and electric unit (control unit), such as dropping it.

Do not remove and install actuator by holding harness.

After work is completed, bleed air from brake tube. Refer to BR-10, "Bleeding Brake System" .

After installing harness connector in the ABS actuator and electric unit (control unit), make sure
connector is securely locked.
REMOVAL
1. Remove cowl top cover. Refer to EI-18, "REMOVAL" .
2. Disconnect ABS actuator and electric unit (control unit) connector.
3. Loosen brake tube flare nuts, then remove brake tubes from ABS actuator and electric unit (control unit).
4. Remove tire.
5. Remove fender protector (rear): (front LH side). Refer to EI-20, "
REMOVAL" .
6. Remove ABS actuator and electric unit (control unit) bracket mounting nut.
1. ABS actuator and electric unit (con-
trol unit)2. Connector 3. To front RH brake caliper
4. To rear LH brake caliper 5. To rear RH brake caliper 6. To front LH brake caliper
7. From master cylinder primary side 8. From master cylinder secondary side 9. Bushing
10. Bracket A. Left side of dash panel
Refer to GI section GI-11, "
Components" for symbol marks in the figure.
SFIA3018E

BRC-58
[VDC/TCS/ABS]
ACTUATOR AND ELECTRIC UNIT (ASSEMBLY)
Revision: 2007 April2007 M35/M45
7. Remove ABS actuator and electric unit (control unit) from vehicle.
INSTALLATION
Installation is the reverse order of removal.
CAUTION:
When replacing ABS actuator and electric unit (control unit), make sure to adjust neutral position of
steering angle sensor. Refer to BRC-6, "
Adjustment of Steering Angle Sensor Neutral Position"