2007 NISSAN TIIDA Service Repair Manual

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Page 1745 of 5883

NISSAN TIIDA 2007 Service Repair Manual EC-396
< FUNCTION DIAGNOSIS >[HR16DE (WITHOUT EURO-OBD)]
ENGINE CONTROL SYSTEM
1. ECM harness connectors 2. ECM 3. IPDM E/R
4. Fuel pump fuse (15A) 5. Intake valve timing control solenoid
valve6. Kno

Page 1746 of 5883

NISSAN TIIDA 2007 Service Repair Manual ENGINE CONTROL SYSTEM
EC-397
< FUNCTION DIAGNOSIS >[HR16DE (WITHOUT EURO-OBD)]
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1. Exhaust manifold 2. Heated oxygen sensor 1 3. Heated oxygen sensor 2
4. Heated oxygen

Page 1747 of 5883

NISSAN TIIDA 2007 Service Repair Manual EC-398
< FUNCTION DIAGNOSIS >[HR16DE (WITHOUT EURO-OBD)]
ENGINE CONTROL SYSTEM
1. Cooling fan motor harness connec-
tor2. Crankshaft position sensor 3. Stop lamp switch
4. Brake pedal 5. Accelerator p

Page 1748 of 5883

NISSAN TIIDA 2007 Service Repair Manual ENGINE CONTROL SYSTEM
EC-399
< FUNCTION DIAGNOSIS >[HR16DE (WITHOUT EURO-OBD)]
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Component DescriptionINFOID:0000000001693462
1. ASCD steering switch 2. MAIN switch 3. CA

Page 1749 of 5883

NISSAN TIIDA 2007 Service Repair Manual EC-400
< FUNCTION DIAGNOSIS >[HR16DE (WITHOUT EURO-OBD)]
ENGINE CONTROL SYSTEM
Knock sensorEC-514, "Description"
Mass air flow sensorEC-487, "Description"
Park/neutral position switchEC-566, "Descript

Page 1750 of 5883

NISSAN TIIDA 2007 Service Repair Manual MULTIPORT FUEL INJECTION SYSTEM
EC-401
< FUNCTION DIAGNOSIS >[HR16DE (WITHOUT EURO-OBD)]
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MULTIPORT FUEL INJECTION SYSTEM
System DiagramINFOID:0000000001693463
System De

Page 1751 of 5883

NISSAN TIIDA 2007 Service Repair Manual EC-402
< FUNCTION DIAGNOSIS >[HR16DE (WITHOUT EURO-OBD)]
MULTIPORT FUEL INJECTION SYSTEM
SYSTEM DESCRIPTION
The amount of fuel injected from the fuel injector is determined by the ECM. The ECM control

EC-402
< FUNCTION DIAGNOSIS >[HR16DE (WITHOUT EURO-OBD)]
MULTIPORT FUEL INJECTION SYSTEM
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
When selector lever is changed from N to D (A/T models)
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-498, "
DTC Logic". 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.
PBIB2953E

Page 1752 of 5883

NISSAN TIIDA 2007 Service Repair Manual MULTIPORT FUEL INJECTION SYSTEM
EC-403
< FUNCTION DIAGNOSIS >[HR16DE (WITHOUT EURO-OBD)]
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Accordingly, the difference between the basic and theoretical mixture ratios is

MULTIPORT FUEL INJECTION SYSTEM
EC-403
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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.
“Long term fuel trim” is overall fuel compensation carried out long-term to compensate for continual deviation
of the short term fuel trim from the central value. Such deviation will occur due to individual engine differences,
wear over time and changes in the usage environment.
FUEL INJECTION TIMING
Two types of systems are used.
Sequential Multiport Fuel Injection System
Fuel is injected into each cylinder during each engine cycle according to the firing order. This system is used
when the engine is running.
Simultaneous Multiport Fuel Injection System
Fuel is injected simultaneously into all four cylinders twice each engine cycle. In other words, pulse signals
of the same width are simultaneously transmitted from the ECM.
The four injectors will then receive the signals two times for each engine cycle.
This system is used when the engine is being started and/or if the fail-safe system (CPU) is operating.
FUEL SHUT-OFF
Fuel to each cylinder is cut off during deceleration, operation of the engine at excessively high speeds or oper-
ation of the vehicle at excessively high speeds.
SEF337W

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