Infiniti I30 (A33). Manual — part 179
System Description
NHEC0015S02
SEF742M
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. This data forms the map shown.
The ECM receives information such as the injection pulse width and camshaft position sensor signal. Com-
puting this information, ignition signals are transmitted to the power transistor.
e.g.,
N: 1,800 rpm, Tp: 1.50 msec
A °BTDC
During the following conditions, the ignition timing is revised by the ECM according to the other data stored
in the ECM.
I
At starting
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During warm-up
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At idle
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At low battery voltage
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During acceleration
The knock sensor retard system is designed only for emergencies. The basic ignition timing is programmed
within the anti-knocking zone, if recommended fuel is used under dry conditions. The retard system does not
operate under normal driving conditions. If engine knocking occurs, the knock sensor monitors the condition.
The signal is transmitted to the ECM. The ECM retards the ignition timing to eliminate the knocking condition.
Air Conditioning Cut Control
DESCRIPTION
NHEC0016
Input/Output Signal Chart
NHEC0016S01
Sensor
Input Signal to ECM
ECM function
Actuator
Air conditioner switch
Air conditioner “ON” signal
Air conditioner
cut control
Air conditioner relay
Throttle position sensor
Throttle valve opening angle
Crankshaft position sensor (POS)
Engine speed (POS signal)
Crankshaft position sensor (REF)
Engine speed (REF signal)
Engine coolant temperature sensor
Engine coolant temperature
Ignition switch
Start signal
Vehicle speed sensor
Vehicle speed
Refrigerant pressure sensor
Refrigerant pressure
Power steering oil pressure switch
Power steering operation
System Description
NHEC0016S02
This system improves engine operation when the air conditioner is used.
Under the following conditions, the air conditioner is turned off.
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When the accelerator pedal is fully depressed.
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When cranking the engine.
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At high engine speeds.
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ENGINE AND EMISSION BASIC CONTROL SYSTEM DESCRIPTION
Electronic Ignition (EI) System (Cont’d)
EC-31
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When the engine coolant temperature becomes excessively high.
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When operating power steering during low engine speed or low vehicle speed.
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When engine speed is excessively low.
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When refrigerant pressure is excessively low or high.
Fuel Cut Control (at no load & high engine
speed)
DESCRIPTION
NHEC0017
Input/Output Signal Chart
NHEC0017S01
Sensor
Input Signal to ECM
ECM func-
tion
Actuator
Vehicle speed sensor
Vehicle speed
Fuel cut
control
Injectors
Park/neutral position (PNP) switch
Neutral position
Throttle position sensor
Throttle position
Engine coolant temperature sensor
Engine coolant temperature
Crankshaft position sensor (POS)
Engine speed (POS signal)
Crankshaft position sensor (REF)
Engine speed (REF signal)
If the engine speed is above 1,800 rpm with no load (for example, in neutral and engine speed over 1,800
rpm) fuel will be cut off after some time. The exact time when the fuel is cut off varies based on engine speed.
Fuel cut will operate until the engine speed reaches 1,500 rpm, then fuel cut is cancelled.
NOTE:
This function is different from deceleration control listed under “Multiport Fuel Injection (MFI) System”, EC-28.
Evaporative Emission System
DESCRIPTION
NHEC0018
SEF569XA
The evaporative emission system is used to reduce hydrocarbons emitted into the atmosphere from the fuel
system. This reduction of hydrocarbons is accomplished by activated charcoals in the EVAP canister.
The fuel vapor in the sealed fuel tank is led into the EVAP canister which contains activated carbon and the
vapor is stored there when the engine is not operating or when refueling to the fuel tank.
The vapor in the EVAP canister is purged by the air through the purge line to the intake manifold when the
engine is operating. EVAP canister purge volume control solenoid valve is controlled by ECM. When the engine
ENGINE AND EMISSION BASIC CONTROL SYSTEM DESCRIPTION
Air Conditioning Cut Control (Cont’d)
EC-32
operates, the flow rate of vapor controlled by EVAP canister purge volume control solenoid valve is propor-
tionally regulated as the air flow increases.
EVAP canister purge volume control solenoid valve also shuts off the vapor purge line during decelerating and
idling.
SEF396T
INSPECTION
NHEC0019
EVAP Canister
NHEC0019S01
Check EVAP canister as follows:
1.
Pinch the fresh air hose.
2.
Blow air into port A and check that it flows freely out of port B.
SEF397T
Tightening Torque
NHEC0019S02
Tighten EVAP canister as shown in the figure.
Make sure new O-ring is installed properly between EVAP can-
ister and EVAP canister vent control valve.
SEF989X
SEF943S
Fuel Tank Vacuum Relief Valve (Built into fuel filler cap)
NHEC0019S03
1.
Wipe clean valve housing.
2.
Check valve opening pressure and vacuum.
Pressure:
15.3 - 20.0 kPa (0.156 - 0.204 kg/cm
2
, 2.22 - 2.90 psi)
Vacuum:
−6.0 to −3.3 kPa (−0.061 to −0.034 kg/cm
2
, −0.87 to
−0.48 psi)
3.
If out of specification, replace fuel filler cap as an assembly.
CAUTION:
Use only a genuine fuel filler cap as a replacement. If an incor-
rect fuel filler cap is used, the MIL may come on.
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ENGINE AND EMISSION BASIC CONTROL SYSTEM DESCRIPTION
Evaporative Emission System (Cont’d)
EC-33
Vacuum Cut Valve and Vacuum Cut Valve Bypass Valve
NHEC0019S04
Refer to EC-582.
Evaporative Emission (EVAP) Canister Purge Volume
Control Solenoid Valve
NHEC0019S05
Refer to EC-377.
Fuel Tank Temperature Sensor
NHEC0019S06
Refer to EC-307.
SEF462UA
Evap Service Port
NHEC0019S07
Positive pressure is delivered to the EVAP system through the
EVAP service port. If fuel vapor leakage in the EVAP system
occurs, use a leak detector to locate the leak.
SEF200U
PEF838U
PEF917U
How to Detect Fuel Vapor Leakage
NHEC0019S08
CAUTION:
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Never use compressed air or a high pressure pump.
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Do not exceed 4.12 kPa (0.042 kg/cm
2
, 0.6 psi) of pressure
in EVAP system.
NOTE:
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Do not start engine.
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Improper installation of EVAP service port adapter to the EVAP
service port may cause a leak.
With CONSULT-II
NHEC0019S0801
1)
Attach the EVAP service port adapter securely to the EVAP
service port.
2)
Also attach the pressure pump and hose to the EVAP service
port adapter.
3)
Turn ignition switch “ON”.
4)
Select the “EVAP SYSTEM CLOSE” of “WORK SUPPORT
MODE” with CONSULT-II.
5)
Touch “START”. A bar graph (Pressure indicating display) will
appear on the screen.
6)
Apply positive pressure to the EVAP system until the pressure
indicator reaches the middle of the bar graph.
7)
Remove EVAP service port adapter and hose with pressure
pump.
8)
Locate the leak using a leak detector. Refer to “EVAPORATIVE
EMISSION LINE DRAWING”, EC-36.
ENGINE AND EMISSION BASIC CONTROL SYSTEM DESCRIPTION
Evaporative Emission System (Cont’d)
EC-34
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