width NISSAN TIIDA 2010 Service User Guide
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![NISSAN TIIDA 2010 Service User Guide P0841 TRANSMISSION FLUID PRESSURE SEN/SW ACVT-109
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P0841 TRANSMISSION FLUI D PRESSURE SEN/SW A
DescriptionINFOID:0000000005397907
Usi NISSAN TIIDA 2010 Service User Guide P0841 TRANSMISSION FLUID PRESSURE SEN/SW ACVT-109
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P0841 TRANSMISSION FLUID PRESSURE SEN/SW ACVT-109
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DescriptionINFOID:0000000005397907
Using the engine load (throttle position), the primary pulley revolution speed, and the secondary pulley revolu-
tion speed as input signal, TCM changes the operating pr essure of the primary pulley and the secondary pul-
ley and changes the groove width of the pulley to control the gear ratio.
CONSULT-III Reference Val ue in Data Monitor ModeINFOID:0000000005397908
Remarks: Specification data are reference values.
On Board Diagnosis LogicINFOID:0000000005397909
• This is not an OBD-II self-diagnostic item.
• Diagnostic trouble code “P0841” with CONSULT-III is detected when secondary fluid pressure is too high
compared with the commanded value while driving.
Possible CauseINFOID:0000000005397910
• Secondary pressure sensor
• Harness or connectors (Sensor circuit is open or shorted.)
DTC Confirmation ProcedureINFOID:0000000005397911
CAUTION:
Always drive vehicle at a safe speed.
NOTE:
If “DTC Confirmation Procedure” has been previously performed, always turn ignition switch OFF and
wait at least 10 seconds before performing the next test.
After the repair, perform the following procedure to confirm the malfunction is eliminated.
WITH CONSULT-III
1. Turn ignition switch ON and select “DATA MO NITOR” mode for “TRANSMISSION” with CONSULT-III.
2. Start engine and maintain the following conditions for at least 12 consecutive seconds. VEHICLE SPEED: 40 km/h (25 MPH) More than
RANGE: “D” position
3. If DTC is detected, go to CVT-109, "
Diagnosis Procedure".
Diagnosis ProcedureINFOID:0000000005397912
1.CHECK CAN COMMUNICATION LINE
Perform the self-diagnosis. Refer to CVT-48, "
CONSULT-III Function (TRANSMISSION)".
Is any malfunction of the
“U1000” indicated?
YES >> Check CAN communication line. Refer to CVT-56.
NO >> GO TO 2.
2.CHECK INPUT SIGNALS
With CONSULT-III
1. Start engine.
2. Select “ECU INPUT SIGNALS” in “DATA MONITO R” mode for “TRANSMISSION” with CONSULT-III.
3. Start vehicle and read out the value of “SEC HYDR SEN” and “PRI HYDR SEN”.
Item nameCondition Display value (Approx.)
PRI HYDR SEN “N” position idle 0.7 V
SEC HYDR SEN 1.0 V
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![NISSAN TIIDA 2010 Service User Guide MULTIPORT FUEL INJECTION SYSTEMEC-37
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*2: This signal is sent to the ECM via the CAN communication line.
*3: ECM determines the start sig NISSAN TIIDA 2010 Service User Guide MULTIPORT FUEL INJECTION SYSTEMEC-37
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*2: This signal is sent to the ECM via the CAN communication line.
*3: ECM determines the start sig](/img/5/57397/w960_57397-1301.png)
MULTIPORT FUEL INJECTION SYSTEMEC-37
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*2: This signal is sent to the ECM via the 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). T he 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 t he 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 prov ides the best air-fuel mixture ratio for driveability and emission control.
The three way catalyst (manifold) can better reduce CO, HC and NOx emissions. This system uses A/F sen-
sor 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 si gnal. For more information about A/F sensor 1, refer to
EC-176, "
Description". This maintains the mixture ratio within t he range of stoichiometric (ideal air-fuel mix-
ture).
This stage is referred to as the closed loop control condition.
Heated oxygen sensor 2 is located downstream of the th ree way catalyst (manifold). Even if the switching
characteristics of A/F sensor 1 shift, the air-fuel rati o is controlled to stoichiometric by the signal from heated
oxygen sensor 2.
• Open Loop Control
The open loop system condition refers to when the EC M 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 A/F sensor 1 or its circuit
- Insufficient activation of A/F sensor 1 at low engine coolant temperature
- High engine coolant temperature
- During warm-up
- After shifting from N to D (A/T models)
- When starting the engine
MIXTURE RATIO SELF-LEARNING CONTROL
The mixture ratio feedback control system monitors the mixture ratio signal transmitted from A/F sensor 1.
This feedback signal is then sent to the ECM. The ECM controls the basic mixture ratio as close to the theoret-
ical mixture ratio as possible. However, the basic mi xture ratio is not necessarily controlled as originally
PBIB2793E
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![NISSAN TIIDA 2010 Service User Guide EC-38
< FUNCTION DIAGNOSIS >[HR16DE]
MULTIPORT FUEL INJECTION SYSTEM
designed. Both manufacturing differences (i.e., mass ai
r flow sensor hot wire) and characteristic changes dur-
ing operation (i.e. NISSAN TIIDA 2010 Service User Guide EC-38
< FUNCTION DIAGNOSIS >[HR16DE]
MULTIPORT FUEL INJECTION SYSTEM
designed. Both manufacturing differences (i.e., mass ai
r flow sensor hot wire) and characteristic changes dur-
ing operation (i.e.](/img/5/57397/w960_57397-1302.png)
EC-38
< FUNCTION DIAGNOSIS >[HR16DE]
MULTIPORT FUEL INJECTION SYSTEM
designed. Both manufacturing differences (i.e., mass ai
r flow sensor hot wire) and characteristic changes dur-
ing 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 co mpared 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 A/F sensor 1 indicates whether the mixture ratio is RICH or LEAN compared to the the-
oretical 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 carri ed out over time to compensate for continual deviation
of the short-term fuel trim from the central value. Continual deviation will occur due to individual engine differ-
ences, 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 cy cle according to the ignition order. This system is
used when the engine is running.
• Simultaneous Multiport Fuel Injection System Fuel is injected simultaneously into all four cylinder s 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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![NISSAN TIIDA 2010 Service User Guide ELECTRIC IGNITION SYSTEMEC-45
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ELECTRIC IGNITION SYSTEM
System DiagramINFOID:0000000005398256
System DescriptionINFOID:0000000005398257
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System DescriptionINFOID:0000000005398257
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ELECTRIC IGNITION SYSTEMEC-45
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ELECTRIC IGNITION SYSTEM
System DiagramINFOID:0000000005398256
System DescriptionINFOID:0000000005398257
INPUT/OUTPUT SIGNAL CHART
*1: This signal is sent to the ECM via the CAN communication line.
*2: ECM determines the start signal status by the signals of engine speed and battery voltage.
SYSTEM DESCRIPTION
Ignition order: 1 - 3 - 4 - 2
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.
The ECM receives information such as the injecti
on pulse width and camshaft position sensor (PHASE) sig-
nal. Computing this information, ignition si gnals are transmitted to the power transistor.
During the following conditions, the ignition timing is revi sed by the ECM according to the other data stored in
the ECM.
• At starting
• During warm-up
•At idle
• At low battery voltage
• During acceleration
JMBIA2194GB
Sensor Input signal to ECMECM functionActuator
Crankshaft position sensor (POS) Engine speed*
2
Piston position
Ignition timing
controlIgnition coil (with power
transistor)
Camshaft position sensor (PHASE)
Mass air flow sensor
Amount of intake air
Engine coolant temperature sensor Engine coolant temperature
Throttle position sensor Throttle position
Accelerator pedal position sensor Accelerator pedal position
Battery Battery voltage*
2
Knock sensorEngine knocking
Park/neutral position (PNP) switch (M/T)
Transmission range switch (A/T) Gear position
ABS actuator and electric unit (control unit) Vehicle speed*
1Combination meter
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![NISSAN TIIDA 2010 Service User Guide EC-100
< FUNCTION DIAGNOSIS >[HR16DE]
ON BOARD DIAGNOSTIC (OBD) SYSTEM
*: The items are the same as those of 1st trip freeze frame data.
DATA MONITOR MODE
Monitored Item
S-FUEL TRM-B1 [%]• “Short- NISSAN TIIDA 2010 Service User Guide EC-100
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ON BOARD DIAGNOSTIC (OBD) SYSTEM
*: The items are the same as those of 1st trip freeze frame data.
DATA MONITOR MODE
Monitored Item
S-FUEL TRM-B1 [%]• “Short-](/img/5/57397/w960_57397-1364.png)
EC-100
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ON BOARD DIAGNOSTIC (OBD) SYSTEM
*: The items are the same as those of 1st trip freeze frame data.
DATA MONITOR MODE
Monitored Item
S-FUEL TRM-B1 [%]• “Short-term fuel trim” at the moment a malfunction is detected is displayed.
• The short-term fuel trim indicates dynamic or instantaneous feedback compensation to the base fuel sched-
ule.
ENGINE SPEED [rpm] • The engine speed at the moment a malfunction is detected is displayed.
VEHICL SPEED
[km/h] or [mph] • The vehicle speed at the moment a malfunction is detected is displayed.
ABSOL TH·P/S [%] • The throttle valve opening angle at the moment a malfunction is detected is displayed.
B/FUEL SCHDL
[msec] • The base fuel schedule at the moment a malfunction is detected is displayed.
INT/A TEMP SE
[ ° C] or [ °F] • The intake air temperature at the moment a malfunction is detected is displayed.
FUEL SYS-B2
• These items displayed but are not applicable to this model.
L-FUEL TRM-B2 [%]
S-FUEL TRM-B2 [%]
INT MANI PRES [kPa]
COMBUST CONDI-
TION Freeze frame data
item* Description
Monitored item Unit
DescriptionRemarks
ENG SPEED rpm• Indicates the engine speed computed from the signal
of the crankshaft position sensor (POS) and camshaft
position sensor (PHASE). • Accuracy becomes poor if engine
speed drops below the idle rpm.
• If the signal is interrupted while the engine is running, an abnormal value
may be indicated.
MAS A/F SE-B1 V • The signal voltage of the mass air flow sensor is dis-
played. • When the engine is stopped, a certain
value is indicated.
• When engine is running specification range is indicated in “SPEC”.
B/FUEL SCHDL ms • “Base fuel schedule” indicates the fuel injection pulse
width programmed into ECM, prior to any learned on
board correction. • When engine is running specification
range is indicated in “SPEC”.
A/F ALPHA-B1 %• The mean value of the air-fuel ratio feedback correc-
tion factor per cycle is indicated. • When the engine is stopped, a certain
value is indicated.
• This data also includes the data for
the air-fuel ratio learning control.
• When engine is running specification range is indicated in “SPEC”.
COOLAN TEMP/S °C or ° F• The engine coolant temperature (determined by the
signal voltage of the engine coolant temperature sen-
sor) is displayed. • When the engine coolant temperature
sensor is open or short-circuited,
ECM enters fail-safe mode. The en-
gine coolant temperature determined
by the ECM is displayed.
A/F SEN1 (B1) V• The A/F signal computed from the input signal of the
air fuel ratio (A/F) se nsor 1 is displayed.
HO2S2 (B1) V• The signal voltage of the heated oxygen sensor 2 is
displayed.
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HO2S2 MNTR(B1)
RICH/
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RICH: means the amount of NISSAN TIIDA 2010 Service User Guide ON BOARD DIAGNOSTIC (OBD) SYSTEMEC-101
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HO2S2 MNTR(B1)
RICH/
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ON BOARD DIAGNOSTIC (OBD) SYSTEMEC-101
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HO2S2 MNTR(B1)
RICH/
LEAN • Display of heated oxygen sensor 2 signal:
RICH: means the amount of oxygen after three way
catalyst is relatively small.
LEAN: means the amount of oxygen after three way
catalyst is relatively large. • When the engine is stopped, a certain
value is indicated.
VHCL SPEED SE km/h or
mph • The vehicle speed computed from the vehicle speed
signal sent from combination meter is displayed.
BATTERY VOLT V • The power supply voltage of ECM is displayed.
ACCEL SEN 1 V• The accelerator pedal position sensor signal voltage is
displayed. • ACCEL SEN 2 signal is converted by
ECM internally. Thus, it differs from
ECM terminal voltage signal.
ACCEL SEN 2
TP SEN 1-B1
V• The throttle position sensor signal voltage is dis-
played. • TP SEN 2-B1 signal is converted by
ECM internally. Thus, it differs from
ECM terminal voltage signal.
TP SEN 2-B1
FUEL T/TMP SE
°C or °F • The fuel temperature (determined by the signal volt-
age of the fuel tank temperature sensor) is displayed.
INT/A TEMP SE °C or °F • The intake air temperature (determined by the signal
voltage of the intake air temperature sensor) is indicat-
ed.
EVAP SYS PRES V • The signal voltage of EVAP control system pressure
sensor is displayed.
FUEL LEVEL SE V • The signal voltage of the fuel level sensor is displayed.
START SIGNAL ON/OFF • Indicates start signal status [ON/OFF] computed by
the ECM according to the signals of engine speed and
battery voltage. • After starting the engine, [OFF] is dis-
played regardless of the starter sig-
nal.
CLSD THL POS ON/OFF • Indicates idle position [ON/OFF] computed by ECM
according to the accelerator pedal position sensor sig-
nal.
AIR COND SIG ON/OFF • Indicates [ON/OFF] condition of the air conditioner
switch determined by the air conditioner ON signal.
P/N POSI SW ON/OFF • Indicates [ON/OFF] condit
ion from the park/neutral
position (PNP) signal.
PW/ST SIGNAL ON/OFF • [ON/OFF] condition of the power steering system (de-
termined by the signal sent from EPS control unit) is
indicated.
LOAD SIGNAL ON/OFF • Indicates [ON/OFF] condition from the electrical load
signal.
ON: Rear window defogger switch is ON and/or light-
ing switch is in 2nd position.
OFF: Both rear window defogger switch and lighting
switch are OFF.
IGNITION SW ON/OFF • Indicates [ON/OFF] condition from ignition switch sig-
nal.
HEATER FAN SW ON/OFF • Indicates [ON/OFF] condition from the heater fan
switch signal.
BRAKE SW ON/OFF• Indicates [ON/OFF] condition from the stop lamp
switch signal.
INJ PULSE-B1 msec • Indicates the actual fuel injection pulse width compen-
sated by ECM according to the input signals. • When the engine is stopped, a certain
computed value is indicated.
IGN TIMING BTDC• Indicates the ignition timing computed by ECM ac-
cording to the input signals. • When the engine is stopped, a certain
value is indicated.
CAL/LD VALUE %• “Calculated load value” indicates the value of the cur-
rent air flow divided by peak air flow.
MASS AIRFLOW g·m/s • Indicates the mass air flow computed by ECM accord-
ing to the signal voltage of the mass air flow sensor.
Monitored item Unit
DescriptionRemarks
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![NISSAN TIIDA 2010 Service User Guide EC-106
< COMPONENT DIAGNOSIS >[HR16DE]
TROUBLE DIAGNOSIS - SPECIFICATION VALUE
COMPONENT DIAGNOSIS
TROUBLE DIAGNOSIS - SPECIFICATION VALUE
DescriptionINFOID:0000000005398280
The specification (SP) val NISSAN TIIDA 2010 Service User Guide EC-106
< COMPONENT DIAGNOSIS >[HR16DE]
TROUBLE DIAGNOSIS - SPECIFICATION VALUE
COMPONENT DIAGNOSIS
TROUBLE DIAGNOSIS - SPECIFICATION VALUE
DescriptionINFOID:0000000005398280
The specification (SP) val](/img/5/57397/w960_57397-1370.png)
EC-106
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TROUBLE DIAGNOSIS - SPECIFICATION VALUE
COMPONENT DIAGNOSIS
TROUBLE DIAGNOSIS - SPECIFICATION VALUE
DescriptionINFOID:0000000005398280
The specification (SP) value indicates the tolerance of
the value that is displayed in “SPEC” of “DATA MONI-
TOR” mode of CONSULT-III during normal operation of the Engine Control System. When the value in “SPEC”
of “DATA MONITOR” mode is within the SP value, the Engine Control System is confirmed OK. When the
value in “SPEC” of “DATA MONITOR” mode is NOT withi n the SP value, the Engine Control System may have
one or more malfunctions.
The SP value is used to detect malfunctions that may af fect the Engine Control System, but will not light the
MIL.
The SP value will be displayed for the following three items:
• B/FUEL SCHDL (The fuel injection pulse width progr ammed into ECM prior to any learned on board correc-
tion)
• A/F ALPHA-B1 (The mean value of air-fuel ratio feedback correction factor per cycle)
• MAS A/F SE-B1 (The signal voltage of the mass air flow sensor)
Component Function CheckINFOID:0000000005398281
1.START
Make sure that all of the following conditions are satisfied.
• Vehicle driven distance: More than 5,000 km (3,107 miles)
• Barometric pressure: 98.3 - 104.3 kPa (1.003 - 1.064 kg/cm
2, 14.25 - 15.12 psi)
• Atmospheric temperature: 20 - 30 °C (68 - 86° F)
• Engine coolant temperature: 75 - 95 °C (167 - 203° F)
• Transmission: Warmed-up
- A/T models: After the engine is warmed up to norma l operating temperature, drive vehicle until “FLUID
TEMP SE” (A/T fluid te mperature sensor signal) indicates more than 60 °C (140 °F).
- M/T models: After the engine is warmed up to normal operating temperature, drive vehicle for 5 minutes.
• Electrical load: Not applied
- Rear window defogger switch, air conditioner switch, lighting switch are OFF. Steering wheel is straight
ahead.
• Engine speed: Idle
>> GO TO 2.
2.PERFORM “SPEC” OF “DATA MONITOR” MODE
With CONSULT-III
NOTE:
Perform “SPEC” in “DATA MONITOR” mode in maximum scale display.
1. Perform EC-20, "
BASIC INSPECTION : Special Repair Requirement".
2. Select “B/FUEL SCHDL”, “A/F ALPHA-B1” and “MAS A/F SE-B1” in “SPEC” of “DATA MONITOR” mode
with CONSULT-III.
3. Make sure that monitor items are within the SP value.
Is the inspection result normal?
YES >> END
NO >> Go to EC-107, "
Diagnosis Procedure".
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![NISSAN TIIDA 2010 Service User Guide EC-138
< COMPONENT DIAGNOSIS >[HR16DE]
P0075 IVT CONTROL SOLENOID VALVE
P0075 IVT CONTROL SOLENOID VALVE
DescriptionINFOID:0000000005398313
Intake valve timing control solenoid valve is activated by O NISSAN TIIDA 2010 Service User Guide EC-138
< COMPONENT DIAGNOSIS >[HR16DE]
P0075 IVT CONTROL SOLENOID VALVE
P0075 IVT CONTROL SOLENOID VALVE
DescriptionINFOID:0000000005398313
Intake valve timing control solenoid valve is activated by O](/img/5/57397/w960_57397-1402.png)
EC-138
< COMPONENT DIAGNOSIS >[HR16DE]
P0075 IVT CONTROL SOLENOID VALVE
P0075 IVT CONTROL SOLENOID VALVE
DescriptionINFOID:0000000005398313
Intake valve timing control solenoid valve is activated by ON/OFF
pulse duty (ratio) signals from the ECM.
The intake valve timing control solenoid valve changes the oil
amount and direction of flow through intake valve timing control unit
or stops oil flow.
The longer pulse width advances valve angle.
The shorter pulse width retards valve angle.
When ON and OFF pulse widths become equal, the solenoid valve
stops oil pressure flow to fix the intake valve angle at the control
position.
DTC LogicINFOID:0000000005398314
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1.PRECONDITIONING
If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at
least 10 seconds before conducting the next test.
>> GO TO2.
2.PERFORM DTC CONFIRMATION PROCEDURE
1. Start engine and let it idle for 5 seconds.
2. Check 1st trip DTC.
Is 1st trip DTC detected?
YES >> Go to EC-139, "Diagnosis Procedure".
NO >> INSPECTION END
JMBIA0098GB
DTC No. Trouble diagnosis name DTC detecting condition Possible cause
P0075 Intake valve timing control
solenoid valve circuit An improper voltage is sent to the ECM
through intake valve timing control solenoid
valve. • Harness or connectors
(Intake valve timing control solenoid valve
circuit is open or shorted.)
• Intake valve timing control solenoid valve
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![NISSAN TIIDA 2010 Service User Guide EC-518
< SERVICE INFORMATION >[MR18DE]
ENGINE CONTROL SYSTEM
The mixture ratio feedback system provides the best air/fuel mixture ratio for drivability and emission control.
The three way catalyst (ma NISSAN TIIDA 2010 Service User Guide EC-518
< SERVICE INFORMATION >[MR18DE]
ENGINE CONTROL SYSTEM
The mixture ratio feedback system provides the best air/fuel mixture ratio for drivability and emission control.
The three way catalyst (ma](/img/5/57397/w960_57397-1782.png)
EC-518
< SERVICE INFORMATION >[MR18DE]
ENGINE CONTROL SYSTEM
The mixture ratio feedback system provides the best air/fuel mixture ratio for drivability and emission control.
The three way catalyst (manifold) can then better r
educe CO, HC and NOx emissions. This system uses air
fuel ratio (A/F) 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 t he sensor voltage signal. For more information about air
fuel ratio (A/F) sensor 1, refer to EC-704
. 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 th ree way catalyst (manifold). Even if the switching
characteristics of air fuel ratio (A/F) 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 air fuel ratio (A/F) sensor 1 or its circuit
• Insufficient activation of air fuel ratio (A /F) sensor 1 at low engine coolant temperature
• High engine coolant temperature
• During warm-up
• After shifting from N to D (A/T and CVT models)
• When starting the engine
MIXTURE RATIO SELF-LEARNING CONTROL
The mixture ratio feedback control system monitors the mixt ure ratio signal transmitted from air fuel ratio (A/F)
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 bas ic 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 co mpared 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 compensati on used to maintain the mixture ratio at its theoretical
value. The signal from air fuel ratio (A/F) sensor 1 i ndicates whether the mixture ratio is RICH or LEAN com-
pared to the theoretical value. The signal then triggers a r eduction 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 carri ed out long-term to compensate for continual deviation
of the short term fuel trim from t he 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 fuel injectors will then receive the signals two times for each engine cycle.
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![NISSAN TIIDA 2010 Service User Guide ENGINE CONTROL SYSTEMEC-519
< SERVICE INFORMATION > [MR18DE]
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This system is used when the engine is being started and/or if the fail-safe system (CPU) is operating.
FUE NISSAN TIIDA 2010 Service User Guide ENGINE CONTROL SYSTEMEC-519
< SERVICE INFORMATION > [MR18DE]
C
D
E
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G H
I
J
K L
M A
EC
NP
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This system is used when the engine is being started and/or if the fail-safe system (CPU) is operating.
FUE](/img/5/57397/w960_57397-1783.png)
ENGINE CONTROL SYSTEMEC-519
< SERVICE INFORMATION > [MR18DE]
C
D
E
F
G H
I
J
K L
M A
EC
NP
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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.
Electronic Ignition (EI) SystemINFOID:0000000005532382
INPUT/OUTPUT SIGNAL CHART
*1: This signal is sent to the ECM through CAN communication line.
*2: ECM determines the start signal status by the signals of engine speed and battery voltage.
SYSTEM DESCRIPTION
Firing order: 1 - 3 - 4 - 2
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.
The ECM receives information such as the injecti
on pulse width and camshaft position sensor (PHASE) sig-
nal. Computing this information, ignition si gnals are transmitted to the power transistor.
During the following conditions, the ignition timing is revi sed by the ECM according to the other data stored in
the ECM.
• At starting
• During warm-up
•At idle
• At low battery voltage
• 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.
Fuel Cut Control (at No Load and High Engine Speed)INFOID:0000000005532383
INPUT/OUTPUT SIGNAL CHART
Sensor Input Signal to ECMECM functionActuator
Crankshaft position sensor (POS) Engine speed*
2
Piston position
Ignition timing
controlPower transistor
Camshaft position sensor (PHASE)
Mass air flow sensor
Amount of intake air
Engine coolant temperature sensor Engine coolant temperature
Throttle position sensor Throttle position
Accelerator pedal position sensor Accelerator pedal position
Battery Battery voltage*
2
Knock sensor Engine knocking
Park/neutral position (PNP) signal Gear position
ABS actuator and electric unit (control unit) Vehicle speed*
1Combination meter
SensorInput Signal to ECMECM functionActuator
Park/neutral position (PNP) signal Neutral position
Fuel cut control Fuel injector
Accelerator pedal position sensor
Accelerator pedal position
Engine coolant temperature sensor Engine coolant temperature
Crankshaft position sensor (POS)
Camshaft position sensor (PHASE) Engine speed
ABS actuator and electric unit (control unit) Vehicle speed*
Combination meter
Revision: January 20102010 Versa