2007 NISSAN TIIDA Service Repair Manual

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Page 1385 of 5883

NISSAN TIIDA 2007 Service Repair Manual EC-36
< FUNCTION DIAGNOSIS >[HR16DE (WITH EURO-OBD)]
ENGINE CONTROL SYSTEM
Component Description
INFOID:0000000001161141
1. ASCD steering switch 2. MAIN switch 3. CANCEL switch
4. SET/COAST switch 5.

Page 1386 of 5883

NISSAN TIIDA 2007 Service Repair Manual ENGINE CONTROL SYSTEM
EC-37
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Knock sensorEC-195, "Description"
Mass air flow sensorEC-134, "Description"
Park/neutral posi

Page 1387 of 5883

NISSAN TIIDA 2007 Service Repair Manual EC-38
< FUNCTION DIAGNOSIS >[HR16DE (WITH EURO-OBD)]
MULTIPORT FUEL INJECTION SYSTEM
MULTIPORT FUEL INJECTION SYSTEM
System DiagramINFOID:0000000001161142
System DescriptionINFOID:0000000001161143
INP

Page 1388 of 5883

NISSAN TIIDA 2007 Service Repair Manual MULTIPORT FUEL INJECTION SYSTEM
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SYSTEM DESCRIPTION
The amount of fuel injected from the fuel injector is determined

MULTIPORT FUEL INJECTION SYSTEM
EC-39
< FUNCTION DIAGNOSIS >[HR16DE (WITH EURO-OBD)]
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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-148, "
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 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.
PBIB2953E

Page 1389 of 5883

NISSAN TIIDA 2007 Service Repair Manual EC-40
< FUNCTION DIAGNOSIS >[HR16DE (WITH EURO-OBD)]
MULTIPORT FUEL INJECTION SYSTEM
“Fuel trim” refers to the feedback compensation value compared against the basic injection duration. Fuel trim

Page 1390 of 5883

NISSAN TIIDA 2007 Service Repair Manual MULTIPORT FUEL INJECTION SYSTEM
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Component Parts LocationINFOID:0000000001677952
1. Ignition coil (with power transi

Page 1391 of 5883

NISSAN TIIDA 2007 Service Repair Manual EC-42
< FUNCTION DIAGNOSIS >[HR16DE (WITH EURO-OBD)]
MULTIPORT FUEL INJECTION SYSTEM
1. Mass air flow sensor
(with intake air temperature sensor)2. Engine coolant temperature sensor 3. Electric thrott

Page 1392 of 5883

NISSAN TIIDA 2007 Service Repair Manual MULTIPORT FUEL INJECTION SYSTEM
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1. ECM harness connectors 2. ECM 3. IPDM E/R
4. Fuel pump fuse (15A) 5. Intake valv

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