sensor NISSAN LATIO 2009 Service Repair Manual

Component Function Check " .
Are they within the SP value? YES >> GO TO 9.
NO >> GO TO 8. Diagnosis Procedure " .
Is malfunctioning part detected? YES >> GO TO 11.
NO >> GO TO 9. Symptom Table " based on the confirmed symptom in
step 4, and determine the trouble diagnosis order based on possible causes and symptom.
>> GO TO 10. 25, " How to Perform Efficient Diagnosis for an Electrical Incident " .
Is malfunctioning part detected? YES >> GO TO 11.
NO >> Monitor input data from related sensors or check the voltage of related ECM terminals using CON-
SULT-III. Refer to EC-461, " Reference Value " .
Diag-
nosis Description " .
>> GO TO 12. YES-1 >> DTC is detected: GO TO 10.
YES-2 >> Symptom remains: GO TO 6.
NO >> 1. Before returning the vehicle to the customer, make sure to erase unnecessary DTC in ECM
(Refer to “How to Erase DTC and 1st Trip DTC” in EC-90, " Diagnosis Description " .) and TCM
(Refer to AT-39, " OBD-II Diagnostic Trouble Code (DTC) " .).
2. If the completion of SRT is needed, drive vehi cle under the specific “DRIVING PATTERN” in
EC-478, " How to Set SRT Code " .
3. INSPECTION END

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2. Rev engine (2,000 to 3,000 rpm) two or three times under no
load, then run engine at idle speed for about 1 minute.
3. Check idle speed.
For procedure, refer to EC-30, " IDLE SPEED : Special Repair
Requirement " . For specification, refer to
EC-504, " Idle Speed " .
Is the inspection result normal? YES >> GO TO 10.
NO >> GO TO 4. ACCELERATOR PEDAL RELEASED
POSITION LEARNING : Special Repair Require-ment " .
>> GO TO 5. THROTTLE VALVE CLOSED
POSITION LEARNING : Special Repair Requirement " .
>> GO TO 6. IDLE AIR VOLUME LEARNING : Special Repair Requirement " .
Is Idle Air Volume Learning carried out successfully? YES >> GO TO 7.
NO >> Follow the instruction of Idle Air Volume Learning. Then GO TO 4. IDLE SPEED : Special Repair Requirement " .
For specification, refer to EC-504, " Idle Speed " .
Is the inspection result normal? YES >> GO TO 10.
NO >> GO TO 8. DTC Logic " .
• Check crankshaft position sensor (POS) and circuit. Refer to EC-263, " DTC Logic " .
Is the inspection result normal? YES >> GO TO 9.
NO >> Repair or replace. Then GO TO 4. ECM Re-communicating Function " .
>> GO TO 4.

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O DTC Logic " .
• Check crankshaft position sensor (POS) and circuit. Refer to EC-263, " DTC Logic " .
Is the inspection result normal? YES >> GO TO 18.
NO >> Repair or replace. Then GO TO 4. ADDITIONAL SERVICE WHEN REPLACING CO
NTROL UNIT : Special Repair Requirement " .
>> GO TO 4. ADDITIONAL SERVICE
WHEN REPLACING CONTROL UNIT : Special Repair Requirement " .
>> INSPECTION END
ADDITIONAL SERVICE WHEN REPLACING CONTROL UNIT
ADDITIONAL SERVICE WHEN REPL ACING CONTROL UNIT : Description
INFOID:0000000004779990
When replacing ECM, this procedure must be performed.
ADDITIONAL SERVICE WHEN REPLACING CONTROL UNIT : Special Repair Re-
quirement INFOID:0000000004779991ECM Re-communicating Function " .
>> GO TO 2. VIN REGISTRATION : Special Repair Requirement " .
>> GO TO 3. ACCELERATOR PEDAL RELEASED POSITION
LEARNING : Special Repair Requirement " .
>> GO TO 4. THROTTLE VALVE CLOSED POSITION L
EARNING : Special Repair Requirement " .
>> GO TO 5. IDLE AIR VOLUME LEARNING : Special Repair Requirement " .
>> END

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1. Mass air flow sensor
(with intake air temperature sensor) 2. Engine coolant temperature sensor 3. Electric throttle control actuator
4. Camshaft position sensor (PHASE) 5. Ignition coil (with power transistor) 6. Fuel injector
7. EVAP canister purge volume control solenoid valve
Vehicle front

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1. Air fuel ratio (A/F) sensor 1 2. Three way catalyst (Manifold) 3. Heated oxygen sensor 2
4. Three way catalyst (Under flloor) 5. Muffler
Vehicle front
1. Exhaust manifold 2. Air fuel ratio (A/F) sensor 1 3. Heated oxygen sensor 2
4. Heated oxygen sensor 2 harness connector
Vehicle front

Description "
A/F sensor 1 heater
EC-136, " Description "
Accelerator pedal position sensor
EC-399, " Description "
Camshaft position sensor (PHASE)
EC-268, " Description "

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Crankshaft position sensor (POS)
EC-263, " Description "
Cooling fan motor
EC-66, " System Description "
Electric throttle control actuator
EC-397, " Description "
Engine coolant temperature sensor
EC-167, " Description "
EVAP canister purge volume control solenoid valve
EC-291, " Description "
EVAP canister vent control valve
EC-301, " Description "
EVAP control system pressure sensor
EC-312, " Description "
Fuel injector
EC-430, " Description "
Fuel level sensor
EC-342, " Description "
Fuel pump
EC-434, " Description "
Fuel tank temperature sensor
EC-240, " Description "
Heated oxygen sensor 2
EC-204, " Description "
Heated oxygen sensor 2 heater
EC-140, " Description "
Ignition signal
EC-439, " Description "
Intake air temperature sensor
EC-162, " Description "
Intake valve timing control solenoid valve
EC-84, " System Description "
Knock sensor
EC-259, " Description "
Mass air flow sensor
EC-148, " Description "
Park/neutral position switch
EC-362, " Description "
PCV valve
EC-456, " Description "
Refrigerant pressure sensor
EC-457, " Description "
Stop lamp switch
EC-380, " Description "
Throttle control motor
EC-393, " Description "
Throttle control motor relay
EC-384, " Description "
Throttle position sensor
EC-171, " Description "Component Reference

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*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 engi ne 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 compens ated 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-182, " 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 cont rols 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

MULTIPORT FUEL INJECTION SYSTEM
EC-45
< FUNCTION DIAGNOSIS >
[HR16DE] C
D E
F
G H
I
J
K L
M A EC
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Component Parts Location
INFOID:0000000004780012
1. Ignition coil (with power transistor) and spark plug 2. Intake valve timing control solenoid
valve 3. Refrigerant pressure sensor
4. Knock sensor 5. Fuel injector 6. Cooling fan motor
7. Camshaft position sensor (PHASE) 8. IPDM E/R 9. ECM
10. Mass air flow sensor (with intake air temperature sensor) 11. Engine coolant temperature sensor 12. Electric throttle control actuator
(with built in throttle position sensor
and throttle control motor)
13. EVAP canister purge volume control solenoid valve PBIB2939E

EC-46< FUNCTION DIAGNOSIS >
[HR16DE]
MULTIPORT FUEL INJECTION SYSTEM
1. Mass air flow sensor (with intake air temperature sensor) 2. Engine coolant temperature sensor 3. Electric throttle control actuator
4. Camshaft position sensor (PHASE) 5. Ignition coil (with power transistor) 6. Fuel injector
7. EVAP canister purge volume control solenoid valve
Vehicle front PBIB2940E