Infiniti G35 (V35). Manual - part 285

PREPARATION

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Commercial Service Tools

NBS000MC

Tool name
(Kent-Moore No.)

Description

Leak detector 
i.e.: (J-41416)

Locating the EVAP leak

EVAP service port 
adapter
i.e.: (J-41413-OBD)

Applying positive pressure through EVAP service 
port

Fuel filler cap adapter
i.e.: (MLR-8382)

Checking fuel tank vacuum relief valve opening 
pressure

Socket wrench

Removing and installing engine coolant 
temperature sensor

Oxygen sensor thread 
cleaner
i.e.: (J-43897-18)
(J-43897-12)

Reconditioning the exhaust system threads 
before installing a new oxygen sensor. Use with 
anti-seize lubricant shown below.
a: 18 mm diameter with pitch 1.5 mm for 
Zirconia Oxygen Sensor
b: 12 mm diameter with pitch 1.25 mm for 
Titania Oxygen Sensor

Anti-seize lubricant 

i.e.: (Permatex

TM

  

133AR or equivalent 
meeting MIL 
specification MIL-A-
907)

Lubricating oxygen sensor thread cleaning tool 
when reconditioning exhaust system threads.

S-NT703

S-NT704

S-NT815

S-NT705

AEM488

S-NT779

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ENGINE CONTROL SYSTEM

ENGINE CONTROL SYSTEM

PFP:23710

System Diagram (A/T models)

NBS000MD

PBIB2552E

ENGINE CONTROL SYSTEM

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System Diagram (M/T models)

NBS000ME

PBIB2775E

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ENGINE CONTROL SYSTEM

Multiport Fuel Injection (MFI) System

NBS000MF

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 (POS) 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.

<Fuel increase>

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During warm-up

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When starting the engine

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During acceleration

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Hot-engine operation

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When selector lever is changed from N to D (A/T models)

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High-load, high-speed operation

<Fuel decrease>

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During deceleration

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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*

1

Density of oxygen in exhaust gas

Air conditioner switch

Air conditioner operation*

2

Wheel sensor

Vehicle speed*

2