2005 INFINITI FX35 Service Manual

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Page 1417 of 4731

INFINITI FX35 2005 Service Manual EC-24
[VQ35DE]
PRECAUTIONS
Revision: 2005 July 2005 FX
Do not disassemble ECM.
If a battery cable is disconnected, the memory will return to
the ECM value.
The ECM will now start to self-control at

Page 1418 of 4731

INFINITI FX35 2005 Service Manual PRECAUTIONS EC-25
[VQ35DE]
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Revision: 2005 July 2005 FX
Before replacing ECM, perform “ECM Terminals and Refer-
ence Value” inspection and make sure ECM fu

Page 1419 of 4731

INFINITI FX35 2005 Service Manual EC-26
[VQ35DE]
PRECAUTIONS
Revision: 2005 July 2005 FX
B1 indicates the bank 1, B2 indicates the bank 2 as shown
in the figure.
Do not operate fuel pump when there is no fuel in lines.
Tighten fue

Page 1420 of 4731

INFINITI FX35 2005 Service Manual PREPARATION EC-27
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Revision: 2005 July 2005 FX
PREPARATIONPFP:00002
Special Service ToolsABS006K2
The actual shapes of Kent-Moore tools may differ from

Page 1421 of 4731

INFINITI FX35 2005 Service Manual EC-28
[VQ35DE]
PREPARATION
Revision: 2005 July 2005 FX
KV109E0010
(J-46209)
Break-out box Measuring ECM signals with a circuit tester
KV109E0080
(J-45819)
Y-cable adapter Measuring ECM signals w

Page 1422 of 4731

INFINITI FX35 2005 Service Manual PREPARATION EC-29
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Revision: 2005 July 2005 FX
Commercial Service ToolsABS006K3
Tool name
(Kent-Moore No.) Description
Leak detector
i.e.: (J-41416

Page 1423 of 4731

INFINITI FX35 2005 Service Manual EC-30
[VQ35DE]
ENGINE CONTROL SYSTEM
Revision: 2005 July 2005 FX
ENGINE CONTROL SYSTEMPFP:23710
System DiagramABS006K4
PBIB2281E

Page 1424 of 4731

INFINITI FX35 2005 Service Manual ENGINE CONTROL SYSTEM EC-31
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Revision: 2005 July 2005 FX
Multiport Fuel Injection (MFI) SystemABS006K7
INPUT/OUTPUT SIGNAL CHART
*1: This sensor is not

ENGINE CONTROL SYSTEM EC-31
[VQ35DE]
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Revision: 2005 July 2005 FX
Multiport Fuel Injection (MFI) SystemABS006K7
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*
2Air conditioner operation
Wheel sensor*
2Vehicle speed

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