2008 INFINITI FX35 steering

BRC-54
< SERVICE INFORMATION >[VDC/TCS/ABS]
ACTUATOR AND ELECTRIC UNIT (ASSEMBLY)
ACTUATOR AND ELECTRIC UNIT (ASSEMBLY)
Removal and InstallationINFOID:0000000001327700
REMOVAL
1. Disconnect ABS actuator and electric unit (control unit) connector.
2. Loosen brake tube flare nuts, then remove brake tubes
from ABS actuator and electric unit (control unit).
3. Remove LH side fender protector. Refer to EI-24
.
4. Remove ABS actuator and electric unit (control unit) mounting nuts.
5. Remove ABS actuator and electric unit (control unit) from vehicle.
CAUTION:
Be careful of the following wh en removing ABS actuator and electric unit (control unit).
 If the part number on the part number label (p asted on actuator upper surface) is the same, ABS
actuator and electric unit (c ontrol unit) can not be used on another vehicle.
If it is used on another vehicle, ABS warning lamp, SLIP indicator lamp and VDC OFF indicator lamp
may turn ON or VDC/TCS/ABS may not operate normally.
When replacing ABS actuator an d electric unit (control unit), must use new service parts.
 Before servicing, disconnect battery cables.
 To remove brake tube, use a flare nut torque wrench to prevent flare nuts and brake tube from being
damaged. To install, use a flare nut torque wren ch (commercial service tool) and tighten to the spec-
ified torque.
 Do not apply excessive impact to actuator, such as dropping it.
 Do not remove and install ABS actuator and el ectric unit (control unit) by holding harness.
INSTALLATION
Note the following, and install in the reverse order of removal.
CAUTION:
Be careful of the following wh en 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-8, "
Bleeding Brake System".
 After installing vehicle harness connector in th e actuator, make sure connector is securely locked.
 When replacing ABS actuator and el ectric unit (control unit), calibrate steering angle sensor neutral
position and decel G sensor. Refer to BRC-8
.
PFIA0601E
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BRC-56
< SERVICE INFORMATION >[VDC/TCS/ABS]
STEERING ANGLE SENSOR
STEERING ANGLE SENSOR
Removal and InstallationINFOID:0000000001327702
REMOVAL
1. Remove spiral cable assembly. Refer to
SRS-36.
2. Remove steering angle sensor from spiral cable assembly.
INSTALLATION
Installation is the reverse order of removal.
CAUTION:
After work, make sure to adjust neutral po sition of steering angle sensor. Refer to BRC-8, "
Adjustment
of Steering Angle Sensor Neutral Position".
SFIA1404E
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EC-6
Diagnosis Procedure .............................................420
DTC P0605 ECM ..............................................422
Component Description ....................................... ..422
On Board Diagnosis Logic .....................................422
DTC Confirmation Procedure ................................422
Diagnosis Procedure .............................................423
DTC P0643 SENSOR POWER SUPPLY ........424
On Board Diagnosis Logic ................................... ..424
DTC Confirmation Procedure ................................424
Wiring Diagram ......................................................425
Diagnosis Procedure .............................................426
DTC P0850 PNP SWITCH ...............................429
Component Description ....................................... ..429
CONSULT-III Reference Value in Data Monitor
Mode .................................................................... ..
429
On Board Diagnosis Logic .....................................429
DTC Confirmation Procedure ................................429
Overall Function Check .........................................430
Wiring Diagram ......................................................431
Diagnosis Procedure .............................................432
DTC P1148, P1168 CLOSED LOOP CON-
TROL ................................................................
434
On Board Diagnosis Logic ................................... ..434
DTC P1211 TCS CONTROL UNIT ..................435
Description ........................................................... ..435
On Board Diagnosis Logic .....................................435
DTC Confirmation Procedure ................................435
Diagnosis Procedure .............................................435
DTC P1212 TCS COMMUNICATION LINE .....436
Description ........................................................... ..436
On Board Diagnosis Logic .....................................436
DTC Confirmation Procedure ................................436
Diagnosis Procedure .............................................436
DTC P1217 ENGINE OVER TEMPERATURE .437
Description ........................................................... ..437
CONSULT-III Reference Value in Data Monitor
Mode .................................................................... ..
438
On Board Diagnosis Logic .....................................438
Overall Function Check .........................................439
Wiring Diagram ......................................................440
Diagnosis Procedure .............................................441
Main 12 Causes of Overheating ............................445
Component Inspection ...........................................446
DTC P1225 TP SENSOR .................................447
Component Description ....................................... ..447
On Board Diagnosis Logic .....................................447
DTC Confirmation Procedure ................................447
Diagnosis Procedure .............................................447
Removal and Installation .......................................448
DTC P1226 TP SENSOR .................................449
Component Description ....................................... ..449
On Board Diagnosis Logic .....................................449
DTC Confirmation Procedure ............................... .449
Diagnosis Procedure .............................................449
Removal and Installation .......................................450
DTC P1421 COLD START CONTROL ............451
Description ........................................................... .451
On Board Diagnosis Logic ....................................451
DTC Confirmation Procedure ................................451
Diagnosis Procedure .............................................451
DTC P1564 ICC STEERING SWITCH ..............453
Component Description ....................................... .453
CONSULT-III Reference Value in Data Monitor
Mode .....................................................................
453
On Board Diagnosis Logic ....................................453
DTC Confirmation Procedure ................................453
Wiring Diagram .....................................................455
Diagnosis Procedure .............................................456
Component Inspection ..........................................458
DTC P1564 ASCD STEERING SWITCH ..........459
Component Description ....................................... .459
CONSULT-III Reference Value in Data Monitor
Mode .....................................................................
459
On Board Diagnosis Logic ....................................459
DTC Confirmation Procedure ................................459
Wiring Diagram .....................................................460
Diagnosis Procedure .............................................461
Component Inspection ..........................................463
DTC P1568 ICC FUNCTION .............................464
On Board Diagnosis Logic ................................... .464
DTC Confirmation Procedure ................................464
Diagnosis Procedure .............................................464
DTC P1572 ICC BRAKE SWITCH ...................465
Component Description ....................................... .465
CONSULT-III Reference Value in Data Monitor
Mode .....................................................................
465
On Board Diagnosis Logic ....................................465
DTC Confirmation Procedure ................................465
Wiring Diagram .....................................................467
Diagnosis Procedure .............................................468
Component Inspection ..........................................472
DTC P1572 ASCD BRAKE SWITCH ...............474
Component Description ....................................... .474
CONSULT-III Reference Value in Data Monitor
Mode .....................................................................
474
On Board Diagnosis Logic ....................................474
DTC Confirmation Procedure ................................474
Wiring Diagram .....................................................476
Diagnosis Procedure .............................................477
Component Inspection ..........................................480
DTC P1574 ICC VEHICLE SPEED SENSOR ..481
Component Description ........................................481
On Board Diagnosis Logic ....................................481
DTC Confirmation Procedure ................................481
Diagnosis Procedure .............................................481
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EC-14
DTC Confirmation Procedure ..............................1045
Diagnosis Procedure ...........................................1045
DTC P1564 ICC STEERING SWITCH ............1047
Component Description .......................................1047
CONSULT-III Reference Value in Data Monitor
Mode ....................................................................
1047
On Board Diagnosis Logic ...................................1047
DTC Confirmation Procedure ..............................1048
Wiring Diagram ....................................................1049
Diagnosis Procedure ...........................................1050
Component Inspection .........................................1052
DTC P1564 ASCD STEERING SWITCH ........1053
Component Description .......................................1053
CONSULT-III Reference Va lue in Data Monitor
Mode ....................................................................
1053
On Board Diagnosis Logic ...................................1053
DTC Confirmation Procedure ..............................1054
Wiring Diagram ....................................................1055
Diagnosis Procedure ...........................................1056
Component Inspection .........................................1058
DTC P1568 ICC FUNCTION ...........................1059
On Board Diagnosis Logic ...................................1059
DTC Confirmation Procedure ..............................1059
Diagnosis Procedure ...........................................1059
DTC P1572 ICC BRAKE SWITCH .................1060
Component Description .......................................1060
CONSULT-III Reference Va lue in Data Monitor
Mode ....................................................................
1060
On Board Diagnosis Logic ...................................1060
DTC Confirmation Procedure ..............................1060
Wiring Diagram ....................................................1062
Diagnosis Procedure ...........................................1063
Component Inspection .........................................1067
DTC P1572 ASCD BRAKE SWITCH .............1068
Component Description .......................................1068
CONSULT-III Reference Va lue in Data Monitor
Mode ....................................................................
1068
On Board Diagnosis Logic ...................................1068
DTC Confirmation Procedure ..............................1068
Wiring Diagram ....................................................1070
Diagnosis Procedure ...........................................1071
Component Inspection .........................................1074
DTC P1574 ICC VEHICLE SPEED SENSOR 1075
Component Description .......................................1075
On Board Diagnosis Logic ...................................1075
DTC Confirmation Procedure ..............................1075
Diagnosis Procedure ...........................................1075
DTC P1574 ASCD VEHICLE SPEED SEN-
SOR .................................................................
1077
Component Description .......................................1077
On Board Diagnosis Logic ...................................1077
DTC Confirmation Procedure ..............................1077
Diagnosis Procedure ...........................................1077
DTC P1715 INPUT SPEED SENSOR (TUR-
BINE REVOLUTION SENSOR) ......................
1079
Description ...........................................................1079
CONSULT-III Reference Value in Data Monitor
Mode ....................................................................
1079
On Board Diagnosis Logic ...................................1079
Diagnosis Procedure ............................................1079
DTC P1800 VIAS CONTROL SOLENOID
VALVE ............................................................
1080
Component Description .......................................1080
CONSULT-III Reference Value in Data Monitor
Mode ....................................................................
1080
On Board Diagnosis Logic ...................................1080
DTC Confirmation Procedure ...............................1080
Wiring Diagram ....................................................1081
Diagnosis Procedure ............................................1082
Component Inspection .........................................1083
Removal and Installation ......................................1083
DTC P1805 BRAKE SWITCH ........................1084
Description ...........................................................1084
CONSULT-III Reference Value in Data Monitor
Mode ....................................................................
1084
On Board Diagnosis Logic ...................................1084
DTC Confirmation Procedure ...............................1084
Wiring Diagram ....................................................1085
Diagnosis Procedure ............................................1086
Component Inspection .........................................1087
DTC P2100, P2103 THROTTLE CONTROL
MOTOR RELAY ..............................................
1088
Component Description .......................................1088
CONSULT-III Reference Value in Data Monitor
Mode ....................................................................
1088
On Board Diagnosis Logic ...................................1088
DTC Confirmation Procedure ...............................1088
Wiring Diagram ....................................................1089
Diagnosis Procedure ............................................1090
DTC P2101 ELECTRIC THROTTLE CON-
TROL FUNCTIO N ...........................................
1092
Description ...........................................................1092
On Board Diagnosis Logic ...................................1092
DTC Confirmation Procedure ...............................1092
Wiring Diagram ....................................................1093
Diagnosis Procedure ............................................1094
Component Inspection .........................................1097
Removal and Installation ......................................1097
DTC P2118 THROTTLE CONTROL MOTOR 1098
Component Description .......................................1098
On Board Diagnosis Logic ...................................1098
DTC Confirmation Procedure ...............................1098
Wiring Diagram ....................................................1099
Diagnosis Procedure ............................................1100
Component Inspection .........................................1101
Removal and Installation ......................................1101
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EC-32
< SERVICE INFORMATION >[VQ35DE]
ENGINE CONTROL SYSTEM
*1: This sensor is not used to control the engine system under normal conditions.
*2: This signal is sent to the ECM through CAN communication line.
*3: ECM determines the start signal status by the signals of engine speed and battery voltage.
SYSTEM DESCRIPTION
The amount of fuel injected from the fuel injector is
determined by the ECM. The ECM controls the length of
time the valve remains open (injection pulse duration). T he amount of fuel injected is a program value in the
ECM memory. The program value is preset by engi ne operating conditions. These conditions are determined
by input signals (for engine speed and intake air) from both the crankshaft position sensor and the mass air
flow sensor.
VARIOUS FUEL INJECTION I NCREASE/DECREASE COMPENSATION
In addition, the amount of fuel injected is compens ated to improve engine performance under various operat-
ing conditions as listed below.
 During warm-up
 When starting the engine
 During acceleration
 Hot-engine operation
 When selector lever is changed from N to D
 High-load, high-speed operation
 During deceleration
 During high engine speed operation
MIXTURE RATIO FEEDBACK CONTROL (CLOSED LOOP CONTROL)
The mixture ratio feedback system prov ides the best air-fuel mixture ratio for driveability and emission control.
The three way catalyst 1 can then better reduce CO, HC and NOx emissions. This system uses air fuel ratio
Sensor Input Signal to ECM ECM function Actuator
Crankshaft position sensor (POS) Engine speed*
3
Piston position
Fuel injection
& mixture ratio
controlFuel injector
Camshaft position sensor (PHASE)
Mass air flow sensor Amount of intake air
Engine coolant temperature sensor Engine coolant temperature
Air fuel ratio (A/F) sensor 1 Density of oxygen in exhaust gas
Throttle position sensor Throttle position
Accelerator pedal position sensor Accelerator pedal position
Park/neutral position (PNP) switch Gear position
Knock sensor Engine knocking condition
Battery
Battery voltage*
3
Power steering pressure sensor Power steering operation
Heated oxygen sensor 2*
1Density of oxygen in exhaust gas
Air conditioner switch Air conditioner operation*
2
Wheel sensorVehicle speed*2
PBIB3020E
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EC-36
< SERVICE INFORMATION >[VQ35DE]
AIR CONDITIONING CUT CONTROL
AIR CONDITIONING CUT CONTROL
Input/Output Signal ChartINFOID:0000000001325899
*1: This signal is sent to the ECM through CAN communication line.
*2: ECM determines the start signal status by the signals of engine speed and battery voltage.
System DescriptionINFOID:0000000001325900
This system improves engine operati
on when the air conditioner is used.
Under the following conditions, the air conditioner is turned OFF.
 When the accelerator pedal is fully depressed.
 When cranking the engine.
 At high engine speeds.
 When the engine coolant temperature becomes excessively high.
 When operating power steering during low engine speed or low vehicle speed.
 When engine speed is excessively low.
 When refrigerant pressure is excessively low or high.
Sensor Input Signal to ECM ECM function Actuator
Air conditioner switch Air conditioner ON signal*
1
Air conditioner
cut controlAir conditio
ner relay
Accelerator pedal position sensor Accelerator pedal position
Throttle position sensor Throttle position
Crankshaft position sensor (POS)
Camshaft position sensor (PHASE)
Engine speed*2
Engine coolant temperature sensor Engine coolant temperature
Battery
Battery voltage*
2
Refrigerant pressure sensor Refrigerant pressure
Power steering pressure sensor Power steering operation
Wheel sensorVehicle speed*
1
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AUTOMATIC SPEED CONTROL DEVICE (ASCD)EC-37
< SERVICE INFORMATION > [VQ35DE]
C
D
E
F
G H
I
J
K L
M A
EC
NP
O
AUTOMATIC SPEED CONTROL DEVICE (ASCD)
System DescriptionINFOID:0000000001325901
INPUT/OUTPUT SIGNAL CHART
*: This signal is sent to the ECM through CAN communication line.
BASIC ASCD SYSTEM
Refer to Owner's Manual for ASCD operating instructions.
Automatic Speed Control Device (ASCD) allows a dr
iver to keep vehicle at predetermined constant speed
without depressing accelerator pedal. Driver can set vehicle speed in advance between approximately 40 km/
h (25 MPH) and 144 km/h (89 MPH).
ECM controls throttle angle of electric thro ttle control actuator to regulate engine speed.
Operation status of ASCD is indicated by CRUISE i ndicator and SET indicator in combination meter. If any
malfunction occurs in ASCD system, it automatically deactivates control.
NOTE:
Always drive vehicle in safe manner according to traffic conditions and obey all traffic laws.
SET OPERATION
Press MAIN switch. (The CRUISE indicator in combination meter illuminates.)
When vehicle speed reaches a desired speed between approximately 40 km/h (25 MPH) and 144 km/h (89
MPH), press SET/COAST switch. (Then SET indi cator in combination meter illuminates.)
ACCELERATOR OPERATION
If the RESUME/ACCELERATE switch is pressed during cruise control driving, increase the vehicle speed until
the switch is released or vehicle speed reac hes maximum speed controlled by the system.
And then ASCD will keep the new set speed.
CANCEL OPERATION
When any of following conditions exist, cruise operation will be canceled.
 CANCEL switch is pressed
 More than 2 switches at ASCD steering switch are pressed at the same time (Set speed will be cleared)
 Brake pedal is depressed
 Selector lever is changed to N, P, R position
 Vehicle speed decreased to 13 km/h (8 MPH) lower than the set speed
 VDC/TCS system is operated
When the ECM detects any of the following conditions, the ECM will cancel the cruise operation and inform
the driver by blinking indicator lamp.
 Engine coolant temperature is slightly higher than the normal operating temperature, CRUISE lamp may
blink slowly.
When the engine coolant temperature decreases to t he normal operating temperature, CRUISE lamp will
stop blinking and the cruise operation will be able to work by depressing SET/COAST switch or RESUME/
ACCELERATE switch.
 Malfunction for some self-diagnoses regarding ASCD control: SET lamp will blink quickly.
If MAIN switch is turned to OFF during ASCD is activated, all of ASCD operations will be canceled and vehicle
speed memory will be erased.
COAST OPERATION
When the SET/COAST switch is pressed during cruise control driving, decrease vehicle set speed until the
switch is released. And then ASCD will keep the new set speed.
RESUME OPERATION
Sensor Input signal to ECM ECM function Actuator
ASCD brake switch Brake pedal operation
ASCD vehicle speed controlElectric throttle control
actuator
Stop lamp switch Brake pedal operation
ASCD steering switch ASCD steering switch operation
Park/neutral position (PNP) switch Gear position
Wheel sensor. Vehicle speed*
TCM Powertrain revolution*
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EC-38
< SERVICE INFORMATION >[VQ35DE]
AUTOMATIC SPEED CONTROL DEVICE (ASCD)
When the RESUME/ACCELERATE switch is pressed
after cancel operation other than depressing MAIN
switch is performed, vehicle speed will return to last set speed. To resume vehicle set speed, vehicle condition
must meet following conditions.
 Brake pedal is released
 Selector lever is in other than P and N positions
 Vehicle speed is greater than 40 km/h (25 MPH) and less than 144 km/h (89 MPH)
Component DescriptionINFOID:0000000001325902
ASCD STEERING SWITCH
Refer to EC-459.
ASCD BRAKE SWITCH
Refer to EC-474 and EC-542.
STOP LAMP SWITCH
Refer to EC-474, EC-486 and EC-542.
ELECTRIC THROTTLE CONTROL ACTUATOR
Refer to EC-490, EC-494, EC-500 and EC-504.
ASCD INDICATOR
Refer to EC-547.
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