2006 INFINITI FX35 Throttle

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Revision: 2006 December 2006 FX35/FX45 On Board Diagnosis Logic ..................................
1219
DTC Confirmation Procedure .............................. 1219
Diagnostic Procedure .......................................... 1220
DTC P1574 ASCD VEHICLE SPEED SENSOR ... 1221
Component Description ....................................... 1221
On Board Diagnosis Logic .................................. 1221
DTC Confirmation Procedure .............................. 1221
Diagnostic Procedure .......................................... 1222
DTC P1715 INPUT SPEED SENSOR (TURBINE
REVOLUTION SENSOR) ...................................... 1223
Description .......................................................... 1223
CONSULT-II Reference Value in Data Monitor Mode 1223
On Board Diagnosis Logic .................................. 1223
Diagnostic Procedure .......................................... 1223
DTC P1800 VIAS CONTROL SOLENOID VALVE 1224 Component Description ....................................... 1224
CONSULT-II Reference Value in Data Monitor Mode 1224
On Board Diagnosis Logic .................................. 1224
DTC Confirmation Procedure .............................. 1224
Wiring Diagram ................................................... 1225
Diagnostic Procedure .......................................... 1226
Component Inspection ........................................ 1227
Removal and Installation ..................................... 1228
DTC P1805 BRAKE SWITCH ............................... 1229
Description .......................................................... 1229
CONSULT-II Reference Value in Data Monitor Mode 1229
On Board Diagnosis Logic .................................. 1229
DTC Confirmation Procedure .............................. 1229
Wiring Diagram ................................................... 1230
Diagnostic Procedure .......................................... 1231
Component Inspection ........................................ 1233
DTC P2100, P2103 THROTTLE CONTROL MOTOR
RELAY ................................................................... 1234
Component Description ....................................... 1234
CONSULT-II Reference Value in Data Monitor Mode 1234
On Board Diagnosis Logic .................................. 1234
DTC Confirmation Procedure .............................. 1234
Wiring Diagram ................................................... 1236
Diagnostic Procedure .......................................... 1237
DTC P2101 ELECTRIC THROTTLE CONTROL
FUNCTION ............................................................. 1240
Description .......................................................... 1240
On Board Diagnosis Logic .................................. 1240
DTC Confirmation Procedure .............................. 1240
Wiring Diagram ................................................... 1241
Diagnostic Procedure .......................................... 1242
Component Inspection ........................................ 1246
Removal and Installation ..................................... 1246
DTC P2118 THROTTLE CONTROL MOTOR ....... 1247
Component Description ....................................... 1247
On Board Diagnosis Logic .................................. 1247
DTC Confirmation Procedure .............................. 1247
Wiring Diagram ................................................... 1248
Diagnostic Procedure .......................................... 1249 Component Inspection .........................................
1250
Removal and Installation ..................................... 1251
DTC P2119 ELECTRIC THROTTLE CONTROL
ACTUATOR ............................................................ 1252
Component Description ....................................... 1252
On Board Diagnosis Logic ................................... 1252
DTC Confirmation Procedure .............................. 1252
Diagnostic Procedure .......................................... 1253
DTC P2122, P2123 APP SENSOR ........................ 1254
Component Description ....................................... 1254
CONSULT-II Reference Value in Data Monitor Mode 1254
On Board Diagnosis Logic ................................... 1254
DTC Confirmation Procedure .............................. 1255
Wiring Diagram .................................................... 1256
Diagnostic Procedure .......................................... 1257
Component Inspection ......................................... 1259
Removal and Installation ..................................... 1260
DTC P2127, P2128 APP SENSOR ........................ 1261
Component Description ....................................... 1261
CONSULT-II Reference Value in Data Monitor Mode 1261
On Board Diagnosis Logic ................................... 1261
DTC Confirmation Procedure .............................. 1262
Wiring Diagram .................................................... 1263
Diagnostic Procedure .......................................... 1264
Component Inspection ......................................... 1267
Removal and Installation ..................................... 1267
DTC P2135 TP SENSOR ....................................... 1268
Component Description ....................................... 1268
CONSULT-II Reference Value in Data Monitor Mode 1268
On Board Diagnosis Logic ................................... 1268
DTC Confirmation Procedure .............................. 1269
Wiring Diagram .................................................... 1270
Diagnostic Procedure .......................................... 1271
Component Inspection ......................................... 1274
Removal and Installation ..................................... 1274
DTC P2138 APP SENSOR .................................... 1275
Component Description ....................................... 1275
CONSULT-II Reference Value in Data Monitor Mode 1275
On Board Diagnosis Logic ................................... 1275
DTC Confirmation Procedure .............................. 1276
Wiring Diagram .................................................... 1277
Diagnostic Procedure .......................................... 1278
Component Inspection ......................................... 1282
Removal and Installation ..................................... 1282
DTC P2A00, P2A03 A/F SENSOR 1 ..................... 1283
Component Description ....................................... 1283
CONSULT-II Reference Value in Data Monitor Mode 1283
On Board Diagnosis Logic ................................... 1283
DTC Confirmation Procedure .............................. 1284
Wiring Diagram .................................................... 1285
Diagnostic Procedure .......................................... 1288
Removal and Installation ..................................... 1294
ASCD BRAKE SWITCH ........................................ 1295
Component Description ....................................... 1295

EC-14Revision: 2006 December 2006 FX35/FX45 CONSULT-II Reference Value in Data Monitor Mode
1295
Wiring Diagram .................................................... 1296
Diagnostic Procedure .......................................... 1297
Component Inspection ......................................... 1301
ASCD INDICATOR ................................................. 1302
Component Description ....................................... 1302
CONSULT-II Reference Value in Data Monitor Mode 1302
Wiring Diagram .................................................... 1303
Diagnostic Procedure .......................................... 1304
ELECTRICAL LOAD SIGNAL ............................... 1305
Description ........................................................... 1305
CONSULT-II Reference Value in Data Monitor Mode 1305
Diagnostic Procedure .......................................... 1305
FUEL INJECTOR ................................................... 1307
Component Description ....................................... 1307
CONSULT-II Reference Value in Data Monitor Mode 1307
Wiring Diagram .................................................... 1308
Diagnostic Procedure .......................................... 1309
Component Inspection ......................................... 1313
Removal and Installation ..................................... 1313
FUEL PUMP ........................................................... 1314
Description ........................................................... 1314
CONSULT-II Reference Value in Data Monitor Mode 1314
Wiring Diagram .................................................... 1315
Diagnostic Procedure .......................................... 1316
Component Inspection ......................................... 1319
Removal and Installation ..................................... 1319
ICC BRAKE SWITCH ............................................. 1320
Component Description ....................................... 1320
CONSULT-II Reference Value in Data Monitor Mode 1320
Wiring Diagram .................................................... 1321
Diagnostic Procedure .......................................... 1322
Component Inspection ......................................... 1327
IGNITION SIGNAL ................................................. 1328
Component Description ....................................... 1328
Wiring Diagram .................................................... 1329 Diagnostic Procedure ...........................................
1334
Component Inspection ......................................... 1339
Removal and Installation ...................................... 1340
REFRIGERANT PRESSURE SENSOR ................. 1341
Component Description ....................................... 1341
Wiring Diagram .................................................... 1342
Diagnostic Procedure ........................................... 1343
Removal and Installation ...................................... 1345
SNOW MODE SWITCH .......................................... 1346
Description ........................................................... 1346
CONSULT-II Reference Value in the Data Monitor
Mode .................................................................... 1346
Wiring Diagram .................................................... 1347
Diagnostic Procedure ........................................... 1348
Component Inspection ......................................... 1350
VARIABLE INDUCTION AIR CONTROL SYSTEM
(VIAS) ..................................................................... 1351
Description ........................................................... 1351
CONSULT-II Reference Value in Data Monitor Mode 1352
Wiring Diagram .................................................... 1353
Diagnostic Procedure ........................................... 1355
Component Inspection ......................................... 1358
Removal and Installation ...................................... 1359
MIL AND DATA LINK CONNECTOR ..................... 1360
Wiring Diagram .................................................... 1360
SERVICE DATA AND SPECIFICATIONS (SDS) ... 1362
Fuel Pressure ....................................................... 1362
Idle Speed and Ignition Timing ............................. 1362
Calculated Load Value ......................................... 1362
Mass Air Flow Sensor .......................................... 1362
Intake Air Temperature Sensor ............................ 1362
Engine Coolant Temperature Sensor ................... 1362
Fuel Tank Temperature Sensor ............................ 1362
Crankshaft Position Sensor (POS) ...................... 1362
Camshaft Position Sensor (PHASE) .................... 1362
A/F Sensor 1 Heater ............................................ 1362
Heated Oxygen sensor 2 Heater ......................... 1363
Throttle Control Motor .......................................... 1363
Fuel Injector ......................................................... 1363
Fuel Pump ............................................................ 1363

PRECAUTIONS EC-25
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EC
Revision: 2006 December 2006 FX35/FX45

Before replacing ECM, perform “ECM Terminals and Refer-
ence Value” inspection and make sure ECM functions prop-
erly. Refer to EC-110, "
ECM Terminals and Reference Value"
.

Handle mass air flow sensor carefully to avoid damage.

Do not disassemble mass air flow sensor.

Do not clean mass air flow sensor with any type of deter-
gent.

Do not disassemble electric throttle control actuator.

Even a slight leak in the air intake system can cause seri-
ous incidents.

Do not shock or jar the camshaft position sensor (PHASE), crankshaft position sensor (POS).

After performing each TROUBLE DIAGNOSIS, perform DTC
Confirmation Procedure or Overall Function Check.
The DTC should not be displayed in the DTC Confirmation
Procedure if the repair is completed. The Overall Function
Check should be a good result if the repair is completed.

When measuring ECM signals with a circuit tester, never
allow the two tester probes to contact.
Accidental contact of probes will cause a short circuit and
damage the ECM power transistor.

Do not use ECM ground terminals when measuring input/
output voltage. Doing so may result in damage to the ECM's
transistor. Use a ground other than ECM terminals, such as
the ground.
MEF040D
SEF217U
SEF348N

ENGINE CONTROL SYSTEM EC-31
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Revision: 2006 December 2006 FX35/FX45
Multiport Fuel Injection (MFI) SystemNBS003L2
INPUT/OUTPUT SIGNAL CHART
*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). The amount of fuel injected is a program value in the
ECM memory. The program value is preset by engine 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 INCREASE/DECREASE COMPENSATION
In addition, the amount of fuel injected is compensated 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
Sensor Input Signal to ECM ECM function Actuator
Crankshaft position sensor (POS) Engine speed*
3
Piston position
Fuel injection
& mixture ratio
control Fuel 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

ENGINE CONTROL SYSTEM EC-33
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Revision: 2006 December 2006 FX35/FX45
FUEL INJECTION TIMING
Two types of systems are used.
Sequential Multiport Fuel Injection System
Fuel is injected into each cylinder during each engine cycle according to the firing order. This system is used
when the engine is running.
Simultaneous Multiport Fuel Injection System
Fuel is injected simultaneously into all six cylinders twice each engine cycle. In other words, pulse signals of
the same width are simultaneously transmitted from the ECM.
The six fuel injectors will then receive the signals two times for each engine cycle.
This system is used when the engine is being started and/or if the fail-safe system (CPU) is operating.
FUEL SHUT-OFF
Fuel to each cylinder is cut off during deceleration, operation of the engine at excessively high speeds or oper-
ation of the vehicle at excessively high speeds.
Electronic Ignition (EI) SystemNBS003L3
INPUT/OUTPUT SIGNAL CHART
*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 DESCRIPTION
Firing order: 1 - 2 - 3 - 4 - 5 - 6
The ignition timing is controlled by the ECM to maintain the best air-fuel ratio for every running condition of the
engine. The ignition timing data is stored in the ECM.
The ECM receives information such as the injection pulse width and camshaft position sensor (PHASE) sig-
nal. Computing this information, ignition signals are transmitted to the power transistor.
During the following conditions, the ignition timing is revised by the ECM according to the other data stored in
the ECM.

At starting

During warm-up

At idle

At low battery voltage
SEF179U
Sensor Input Signal to ECM ECM function Actuator
Crankshaft position sensor (POS) Engine speed*
2
Piston position
Ignition timing
control Power transistor
Camshaft position sensor (PHASE)
Mass air flow sensor Amount of intake air
Engine coolant temperature sensor Engine coolant temperature
Throttle position sensor Throttle position
Accelerator pedal position sensor Accelerator pedal position
Knock sensor Engine knocking
Park/neutral position (PNP) switch Gear position
Battery Battery voltage*
2
Wheel sensorVehicle speed*1

AIR CONDITIONING CUT CONTROL EC-35
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Revision: 2006 December 2006 FX35/FX45
AIR CONDITIONING CUT CONTROLPFP:23710
Input/Output Signal ChartNBS003L5
*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 DescriptionNBS003L6
This system improves engine operation 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 control Air conditioner 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 sensor Vehicle speed*
1

EC-36
[VQ35DE]
AUTOMATIC SPEED CONTROL DEVICE (ASCD)
Revision: 2006 December 2006 FX35/FX45
AUTOMATIC SPEED CONTROL DEVICE (ASCD)PFP:18930
System DescriptionNBS003L7
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 driver 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 throttle control actuator to regulate engine speed.
Operation status of ASCD is indicated by CRUISE indicator 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 indicator 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 reaches 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 the 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.
Sensor Input signal to ECM ECM function Actuator
ASCD brake switch Brake pedal operation
ASCD vehicle speed control Electric throttle control
actuator
Stop lamp switch Brake pedal operation
ASCD steering switch ASCD steering switch operation
Park/Neutral position (PNP)
switch Gear position
Unified meter and A/C amp. Vehicle speed*
TCM Powertrain revolution*

AUTOMATIC SPEED CONTROL DEVICE (ASCD) EC-37
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Revision: 2006 December 2006 FX35/FX45
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
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 DescriptionNBS003L8
ASCD STEERING SWITCH
Refer to EC-521 .
ASCD BRAKE SWITCH
Refer to EC-538 and EC-616 .
STOP LAMP SWITCH
Refer to EC-538 , EC-551 and EC-616 .
ELECTRIC THROTTLE CONTROL ACTUATOR
Refer to EC-556 , EC-562 , EC-568 and EC-573 .
ASCD INDICATOR
Refer to EC-623 .