2007 NISSAN TIIDA Service Repair Manual

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Page 2049 of 5883

NISSAN TIIDA 2007 Service Repair Manual EC-700
< FUNCTION DIAGNOSIS >[MR18DE]
ENGINE CONTROL SYSTEM
1. Intake valve timing control solenoid
valve2. Knock sensor 3. IPDM E/R
4. Fuel pump fuse 5. Fuel level sensor unit and fuel pump
harness

Page 2050 of 5883

NISSAN TIIDA 2007 Service Repair Manual ENGINE CONTROL SYSTEM
EC-701
< FUNCTION DIAGNOSIS >[MR18DE]
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1. Heated oxygen sensor 1 2. Three way catalyst (Manifold) 3. Heated oxygen sensor 2
4. Three way catalyst (

Page 2051 of 5883

NISSAN TIIDA 2007 Service Repair Manual EC-702
< FUNCTION DIAGNOSIS >[MR18DE]
ENGINE CONTROL SYSTEM
1. Crankshaft position sensor (POS) 2. Comshaft position sensor (PHASE) 3. EVAP canistor purge volume control
solenoid valve
4. ECM 5. Stop

Page 2052 of 5883

NISSAN TIIDA 2007 Service Repair Manual ENGINE CONTROL SYSTEM
EC-703
< FUNCTION DIAGNOSIS >[MR18DE]
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Component DescriptionINFOID:0000000001161722
1. ASCD steering switch 2. MAIN switch 3. CANCEL switch
4. SET/

Page 2053 of 5883

NISSAN TIIDA 2007 Service Repair Manual EC-704
< FUNCTION DIAGNOSIS >[MR18DE]
ENGINE CONTROL SYSTEM
Intake valve timing control solenoid valveEC-753, "System Description"
Knock sensorEC-860, "Description"
Mass air flow sensorEC-799, "Descri

Page 2054 of 5883

NISSAN TIIDA 2007 Service Repair Manual MULTIPORT FUEL INJECTION SYSTEM
EC-705
< FUNCTION DIAGNOSIS >[MR18DE]
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MULTIPORT FUEL INJECTION SYSTEM
System DiagramINFOID:0000000001161723
System DescriptionINFOID:000

Page 2055 of 5883

NISSAN TIIDA 2007 Service Repair Manual EC-706
< FUNCTION DIAGNOSIS >[MR18DE]
MULTIPORT FUEL INJECTION SYSTEM
*3: ECM determines the start signal status by the signals of engine speed and battery voltage.
SYSTEM DESCRIPTION
The amount of fu

EC-706
< FUNCTION DIAGNOSIS >[MR18DE]
MULTIPORT FUEL INJECTION SYSTEM
*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 the crankshaft position sensor (POS), camshaft position
sensor (PHASE) 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
High-load, high-speed operation
During deceleration
During high engine speed operation
MIXTURE RATIO FEEDBACK CONTROL (CLOSED LOOP CONTROL)
The mixture ratio feedback system provides the best air-fuel mixture ratio for driveability and emission control.
The three way catalyst (manifold) can then better reduce CO, HC and NOx emissions. This system uses
heated oxygen sensor 1 in the exhaust manifold to monitor whether the engine operation is rich or lean. The
ECM adjusts the injection pulse width according to the sensor voltage signal. For more information about
heated oxygen sensor 1, refer to EC-813, "
Description". This maintains the mixture ratio within the range of
stoichiometric (ideal air-fuel mixture).
This stage is referred to as the closed loop control condition.
Heated oxygen sensor 2 is located downstream of the three way catalyst (manifold). Even if the switching
characteristics of heated oxygen sensor 1 shift, the air-fuel ratio is controlled to stoichiometric by the signal
from heated oxygen sensor 2.
Open Loop Control
The open loop system condition refers to when the ECM detects any of the following conditions. Feedback
control stops in order to maintain stabilized fuel combustion.
- Deceleration and acceleration
- High-load, high-speed operation
- Malfunction of heated oxygen sensor 1 or its circuit
- Insufficient activation of heated oxygen sensor 1 at low engine coolant temperature
- High engine coolant temperature
- During warm-up
- When starting the engine
MIXTURE RATIO SELF-LEARNING CONTROL
The mixture ratio feedback control system monitors the mixture ratio signal transmitted from heated oxygen
sensor 1. This feedback signal is then sent to the ECM. The ECM controls the basic mixture ratio as close to
the theoretical mixture ratio as possible. However, the basic mixture ratio is not necessarily controlled as orig-
inally designed. Both manufacturing differences (i.e., mass air flow sensor hot wire) and characteristic
changes during operation (i.e., fuel injector clogging) directly affect mixture ratio.
Accordingly, the difference between the basic and theoretical mixture ratios is monitored in this system. This is
then computed in terms of “injection pulse duration” to automatically compensate for the difference between
the two ratios.
“Fuel trim” refers to the feedback compensation value compared against the basic injection duration. Fuel trim
includes short term fuel trim and long term fuel trim.
“Short term fuel trim” is the short-term fuel compensation used to maintain the mixture ratio at its theoretical
value. The signal from heated oxygen sensor 1 indicates whether the mixture ratio is RICH or LEAN compared
to the theoretical value. The signal then triggers a reduction in fuel volume if the mixture ratio is rich, and an
increase in fuel volume if it is lean.

Page 2056 of 5883

NISSAN TIIDA 2007 Service Repair Manual MULTIPORT FUEL INJECTION SYSTEM
EC-707
< FUNCTION DIAGNOSIS >[MR18DE]
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“Long term fuel trim” is overall fuel compensation carried out long-term to compensate for con

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