heater NISSAN LATIO 2010 Service User Guide

EC-14
Wiring Diagram ....................................................1010
Diagnosis Procedure ...........................................1011
Component Inspection .........................................1013
Removal and Installation .....................................1013
FUEL PUMP ....................................................1014
Description ...........................................................1014
CONSULT-III Reference Value in Data Monitor
Mode ....................................................................
1014
Wiring Diagram ....................................................1015
Diagnosis Procedure ...........................................1016
Component Inspection .........................................1018
Removal and Installation .....................................1018
IGNITION SIGNAL ..........................................1019
Component Description .......................................1019
Wiring Diagram ....................................................1020
Diagnosis Procedure ...........................................1023
Component Inspection .........................................1026
Removal and Installation .....................................1027
REFRIGERANT PRESSURE SENSOR .........1028
Component Description .......................................1028
Wiring Diagram ....................................................1029
Diagnosis Procedure ............................................1030
Removal and Installation ......................................1032
MIL AND DATA LINK CONNECTOR .............1033
Wiring Diagram ....................................................1033
SERVICE DATA AND SPECIFICATIONS
(SDS) ..............................................................
1035
Fuel Pressure .......................................................1035
Idle Speed and Ignition Timing ............................1035
Calculated Load Value .........................................1035
Mass Air Flow Sensor ..........................................1035
Intake Air Temperature Se nsor ............................1035
Engine Coolant Temperature Sensor ..................1035
Air Fuel Ratio (A/F) Sensor 1 Heater ...................1036
Heated Oxygen sensor 2 Heater .........................1036
Crankshaft Position Sensor (POS) ......................1036
Camshaft Position Sensor (PHASE) ....................1036
Throttle Control Motor ...... ....................................1036
Fuel Injector .........................................................1036
Fuel Pump ............................................................1036
Revision: January 20102010 Versa

EC-34
< FUNCTION DIAGNOSIS >[HR16DE]
ENGINE CONTROL SYSTEM
Component Description
INFOID:0000000005398251
1. Cooling fan motor harness connec- tor 2. Crankshaft position sensor
3. Stop lamp switch
4. Brake pedal 5. Accelerator pedal position sensor
harness connector 6. Accelerator pedal position sensor
7. Accelerator pedal 8. Fuel level sensor unit and fuel pump
harness connector (view with in-
spection hole cover removed) 9. Fuel pressure regulator
10. Fuel pump
AWBIA0044ZZ
Component Reference
A/F sensor 1 EC-176, "
Description"
A/F sensor 1 heaterEC-130, "Description"
Accelerator pedal position sensorEC-392, "Description"
Camshaft position sensor (PHASE)EC-262, "Description"
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ENGINE CONTROL SYSTEMEC-35
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Crankshaft position sensor (POS)
EC-257, "Description"
Cooling fan motorEC-60, "System Description"
Electric throttle control actuatorEC-390, "Description"
Engine coolant temperature sensorEC-161, "Description"
EVAP canister purge volume control solenoid valveEC-285, "Description"
EVAP canister vent control valveEC-295, "Description"
EVAP control system pressure sensorEC-306, "Description"
Fuel injectorEC-423, "Description"
Fuel level sensorEC-336, "Description"
Fuel pumpEC-427, "Description"
Fuel tank temperature sensorEC-234, "Description"
Heated oxygen sensor 2EC-198, "Description"
Heated oxygen sensor 2 heaterEC-134, "Description"
Ignition signalEC-432, "Description"
Intake air temperature sensorEC-156, "Description"
Intake valve timing control solenoid valveEC-78, "System Description"
Knock sensorEC-253, "Description"
Mass air flow sensorEC-142, "Description"
PCV valveEC-449, "Description"
Refrigerant pressure sensorEC-450, "Description"
Stop lamp switchEC-373, "Description"
Throttle control motorEC-386, "Description"
Throttle control motor relayEC-377, "Description"
Throttle position sensorEC-165, "Description"
Component Reference
Revision: January 20102010 Versa

ON BOARD DIAGNOSTIC (OBD) SYSTEMEC-101
< FUNCTION DIAGNOSIS > [HR16DE]
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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
Revision: January 20102010 Versa

EC-102
< FUNCTION DIAGNOSIS >[HR16DE]
ON BOARD DIAGNOSTIC (OBD) SYSTEM
*: The item is indicated, but not used.
NOTE:
Any monitored item that does not match the vehicle being diagnosed is deleted from the display automatically.PURG VOL C/V %
• Indicates the EVAP canister purge volume control so-
lenoid valve control value computed by the ECM ac-
cording to the input signals.
• The opening becomes larger as the value increases.
INT/V TIM(B1) °CA • Indicates [ °CA] of intake camshaft advance angle.
INT/V SOL(B1) %• The control value of the intake valve timing control so-
lenoid valve (determined by ECM according to the in-
put signals) is indicated.
• The advance angle becomes larger as the value in- creases.
AIR COND RLY ON/OFF • The air conditioner relay control condition (determined
by ECM according to the input signals) is indicated.
FUEL PUMP RLY ON/OFF • Indicates the fuel pump relay control condition deter-
mined by ECM according to the input signals.
VENT CONT/V ON/OFF • The control condition of the EVAP canister vent control
valve (determined by ECM according to the input sig-
nals) is indicated.
ON: Closed
OFF: Open
THRTL RELAY ON/OFF • Indicates the throttle contro
l motor relay control condi-
tion determined by the ECM according to the input sig-
nals.
COOLING FAN HI/LOW/
OFF• Indicates the condition of the cooling fan (determined
by ECM according to the input signals).
HI: High speed operation
LOW: Low speed operation
OFF: Stop
HO2S2 HTR (B1) ON/OFF • Indicates [ON/OFF] condition of heated oxygen sen-
sor 2 heater determined by ECM according to the in-
put signals.
I/P PULLY SPD rpm • Indicates the engine speed computed from the prima-
ry sped sensor signal.
VEHICLE SPEED km/h or
mph • The vehicle speed computed from the vehicle speed
signal sent from TCM is displayed.
IDL A/V LEARN YET/CM-
PLT • Display the condition of Idle Air Volume Learning
YET: Idle air volume learning has not been performed
yet.
CMPLT: Idle air volume learning has already been per-
formed successfully.
TRVL AFTER MIL km or
mile • Distance traveled while MIL is activated.
A/F S1 HTR(B1) % • Air fuel ratio (A/F) sensor 1 heater control value com-
puted by ECM according to the input signals.
• The current flow to the heater becomes larger as the value increases.
AC PRESS SEN V • The signal voltage from the refrigerant pressure sen-
sor is displayed.
A/F ADJ-B1 —• Indicates the correction of factor stored in ECM. The
factor is calculated from the difference between the
target air-fuel ratio stored in ECM and the air-fuel ratio
calculated from A/F sensor 1 signal.
HO2 S2 DIAG2 (B1)
*
[INCMP/CMPLT] —• Indicates DTC P0139 self-diagnosis (slow responce)
INCMP: Self-diagnosis is incomplete.
CMPLT: Self-diagnosis is complete.
Monitored item Unit
DescriptionRemarks
Revision: January 20102010 Versa

EC-130
< COMPONENT DIAGNOSIS >[HR16DE]
P0031, P0032 A/F SENSOR 1 HEATER
P0031, P0032 A/F SENSOR 1 HEATER
DescriptionINFOID:0000000005398303
SYSTEM DESCRIPTION
The ECM performs ON/OFF duty control of the A/F
sensor 1 heater corresponding to the engine operating
condition to keep the temperature of A/F sensor 1 element at the specified range.
DTC LogicINFOID:0000000005398304
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.
TESTING CONDITION:
Before performing the following procedure, confirm th at battery voltage is more than between 11 V at
idle.
>> GO TO 2.
2.PERFORM DTC CONFIRMATION PROCEDURE
1. Start engine and let it idle for at least 10 seconds.
2. Check 1st trip DTC.
Is 1st trip DTC detected?
YES >> Go to EC-131, "Diagnosis Procedure".
NO >> INSPECTION END
Sensor Input signal to ECM ECM functionActuator
Camshaft position sensor (PHASE)
Crankshaft position sensor (POS) Engine speed
Air fuel ratio (A/F) sensor 1
heater control Air fuel ratio (A/F) sensor 1
heater
Mass air flow sensor Amount of intake air
DTC No. Trouble diagnosis name DTC detecting conditionPossible cause
P0031 Air fuel ratio (A/F) sensor 1
heater control circuit low The current amperage in the A/F sensor 1 heater
circuit is out of the normal range.
(An excessively low voltage signal is sent to ECM
through the A/F sensor 1 heater.) • Harness or connectors
(The A/F sensor 1 heater circuit is
open or shorted.)
• A/F sensor 1 heater
P0032 Air fuel ratio (A/F) sensor 1
heater control circuit high The current amperage in the A/F sensor 1 heater
circuit is out of the normal range.
(An excessively high voltage signal is sent to ECM
through the A/F sensor 1 heater.) • Harness or connectors
(The A/F sensor 1 heater circuit is
shorted.)
• A/F sensor 1 heater
Revision: January 20102010 Versa

P0031, P0032 A/F SENSOR 1 HEATER
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Wiring DiagramINFOID:0000000005398305
Diagnosis ProcedureINFOID:0000000005398306
1.CHECK GROUND CONNECTION
1. Turn ignition switch OFF.
2. Check ground connections E15, E24. Refer to EC-119, "
Ground Inspection".
Is the inspection result normal?
AABWA0308GB
Revision: January 20102010 Versa

EC-132
< COMPONENT DIAGNOSIS >[HR16DE]
P0031, P0032 A/F SENSOR 1 HEATER
YES >> GO TO 2.
NO >> Repair or replace ground connection.
2.CHECK AIR FUEL RATIO (A/F) SENSOR 1 POWER SUPPLY CIRCUIT
1. Disconnect air fuel ratio (A/F) sensor 1 harness connector.
2. Turn ignition switch ON.
3. Check the voltage between A/F sensor 1 harness connector and ground.
Is the inspection result normal?
YES >> GO TO 4.
NO >> GO TO 3.
3.DETECT MALFUNCTIONING PART
Check the following.
• Harness connectors E8, F8
• IPDM E/R harness connector E45
• 10 A fuse (No. 54)
• Harness for open or short between A/F sensor 1 and fuse
>> Repair or replace harness or connectors.
4.CHECK A/F SENSOR 1 HEATER OUTPUT SIGNAL CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect ECM harness connector.
3. Check the continuity between A/F sensor 1 harness connector and ECM harness connector.
4. Also check harness for short to ground and short to power.
Is the inspection result normal?
YES >> GO TO 5.
NO >> Repair open circuit or short to ground or short to power in harness or connectors.
5.CHECK A/F SENSOR 1 HEATER
Refer to EC-133, "
Component Inspection".
Is the inspection result normal?
YES >> GO TO 7.
NO >> GO TO 6.
6.REPLACE AIR FUEL RATIO (A/F) SENSOR 1
Replace air fuel ratio (A/F) sensor 1.
CAUTION:
• Discard any sensor which has been dropped from a height of more than 0.5 m (19.7 in) onto a hard surface such as a concrete floor; use a new one.
• Before installing new sensor, clean exhaust system threads usi ng Oxygen Sensor Thread Cleaner
[commercial service tool (J-43897-18 or J-43897-12)] an d approved Anti-seize Lubricant (commercial
service tool).
>> INSPECTION END
A/F sensor 1 Ground Voltage
Connector Terminal
F12 4 Ground Battery voltage
PBIB3308E
A/F sensor 1 ECM
Continuity
Connector Terminal Connector Terminal
F12 3F10 3Existed
Revision: January 20102010 Versa

P0031, P0032 A/F SENSOR 1 HEATER
EC-133
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7.CHECK INTERMITTENT INCIDENT
Perform EC-114, "
Diagnosis Procedure".
>> Repair or replace.
Component InspectionINFOID:0000000005398307
1.CHECK AIR FUEL RATIO (A/F) SENSOR 1
1. Turn ignition switch OFF.
2. Disconnect A/F sensor 1 harness connector.
3. Check resistance between A/F sensor 1 terminals as per the fol- lowing.
Is the inspection result normal?
YES >> INSPECTION END
NO >> GO TO 2.
2.REPLACE AIR FUEL RATIO (A/F) SENSOR 1
Replace air fuel ratio (A/F) sensor 1.
CAUTION:
• Discard any sensor which has been dropped from a he ight of more than 0.5 m (19.7 in) onto a hard
surface such as a concrete floor; use a new one.
• Before installing new sensor, clean exhaust syst em threads using Oxygen Sensor Thread Cleaner
[commercial service tool (J-43897-18 or J43897-12)] and approved Anti-seize Lubricant (commercial
service tool).
>> INSPECTION END
Terminals Resistance
3 and 4 1.98 - 2.66 Ω [at 25°C (77 °F)]
3 and 1, 2 ∞ Ω
(Continuity should not exist)
4 and 1, 2
PBIB3309E
Revision: January 20102010 Versa

EC-134
< COMPONENT DIAGNOSIS >[HR16DE]
P0037, P0038 HO2S2 HEATER
P0037, P0038 HO2S2 HEATER
DescriptionINFOID:0000000005398308
SYSTEM DESCRIPTION
The ECM performs ON/OFF control of the heated oxy
gen sensor 2 heater corresponding to the engine speed,
amount of intake air and engine coolant temperature.
OPERATION
DTC LogicINFOID:0000000005398309
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.
TESTING CONDITION:
Before performing the following procedure, confirm that battery voltage is more than 11 V at idle.
>> GO TO 2.
2.PERFORM DTC CONFIRMATION PROCEDURE
With CONSULT-III
1. Turn ignition switch ON and select “DATA MONITOR” mode with CONSULT-III.
2. Start engine and warm it up to normal operating temperature.
3. Turn ignition switch OFF and wait at least 10 seconds.
4. Start engine and keep the engine speed between 3,500 and 4,000 rpm for at least 1 minute under no load.
5. Let engine idle for 1 minute.
6. Check 1st trip DTC.
With GST
Follow the procedure “With CONSULT-III” above.
Is 1st trip DTC detected?
Sensor Input signal to ECM ECM function Actuator
Camshaft position sensor (PHASE)
Crankshaft position sensor (POS) Engine speed
Heated oxygen sensor 2
heater controlHeated oxygen sensor 2 heater
Engine coolant temperature sensor Engine coolant temperature
Mass air flow sensor Amount of intake air
Engine speed Heated oxygen sensor 2 heater
Above 3,600 rpm OFF
Below 3,600 rpm after the following conditions are met.
• Engine: After warming up
• Keeping the engine speed between 3,500 and 4,000 rpm for 1 minute and at idle for 1 minute under no load ON
DTC No. Trouble diagnosis name
DTC detecting conditionPossible cause
P0037 Heated oxygen sensor 2
heater control circuit low The current amperage in the heated oxygen sensor
2 heater circuit is out of the normal range.
(An excessively low voltage signal is sent to ECM
through the heated oxygen sensor 2 heater.) • Harness or connectors
(The heated oxygen sensor 2 heater
circuit is open or shorted.)
• Heated oxygen sensor 2 heater
P0038 Heated oxygen sensor 2
heater control circuit high The current amperage in the heated oxygen sensor
2 heater circuit is out of the normal range.
(An excessively high voltage signal is sent to ECM
through the heated oxygen sensor 2 heater.) • Harness or connectors
(The heated oxygen sensor 2 heater
circuit is shorted.)
• Heated oxygen sensor 2 heater
Revision: January 20102010 Versa