Nissan Almera Tino V10 (2001 year). Manual — part 86
SEF206T
Component Description
NLEC1773
MODELS WITH INTAKE AIR TEMPERATURE SENSOR
ON INTAKE AIR DUCT
NLEC1773S01
The intake air temperature sensor is mounted to the air duct hous-
ing. The sensor detects intake air temperature and transmits a sig-
nal to the ECM.
The temperature sensing unit uses a thermistor which is sensitive
to the change in temperature. Electrical resistance of the thermistor
decreases in response to the temperature rise.
SEF012P
<Reference data>
Intake air temperature
°C (°F)
Voltage*
V
Resistance
k
Ω
20 (68)
3.5
2.1 - 2.9
80 (176)
1.23
0.27 - 0.38
*: These data are reference values and are measured between ECM terminal 64
(Intake air temperature sensor) and ground.
CAUTION:
Do not use ECM ground terminals when measuring input/
output voltage. Doing so may result in damage to the ECM’s
transistor. Use a ground other than ECM terminals, such as
the ground.
NEF306A
MODELS WITH INTAKE AIR TEMPERATURE SENSOR
IN MASS AIR FLOW SENSOR
NLEC1773S02
The intake air temperature sensor is built into the mass air flow
sensor. The sensor detects intake air temperature and transmits a
signal to the ECM.
The temperature sensing unit uses a thermistor which is sensitive
to the change in temperature. Electrical resistance of the thermistor
decreases in response to the temperature rise.
SEF012P
<Reference data>
Intake air temperature
°C (°F)
Voltage*
V
Resistance
k
Ω
20 (68)
3.5
2.1 - 2.9
80 (176)
1.23
0.27 - 0.38
*: These data are reference values and are measured between ECM terminal 64
(Intake air temperature sensor) and ground.
INTAKE AIR TEMPERATURE SENSOR
SR20DE
Component Description
EC-937
CAUTION:
Do not use ECM ground terminals when measuring input/
output voltage. Doing so may result in damage to the ECM’s
transistor. Use a ground other than ECM terminals, such as
the ground.
INTAKE AIR TEMPERATURE SENSOR
SR20DE
Component Description (Cont’d)
EC-938
Wiring Diagram
NLEC1776
MODELS WITH INTAKE AIR TEMPERATURE SENSOR
ON INTAKE AIR DUCT
NLEC1776S01
YEC755
INTAKE AIR TEMPERATURE SENSOR
SR20DE
Wiring Diagram
EC-939
MODELS WITH INTAKE AIR TEMPERATURE SENSOR
IN MASS AIR FLOW SENSOR
NLEC1776S02
YEC930
INTAKE AIR TEMPERATURE SENSOR
SR20DE
Wiring Diagram (Cont’d)
EC-940
Diagnostic Procedure
NLEC1779
1
CHECK OVERALL FUNCTION
1. Turn ignition switch “ON”.
2. Check voltage between ECM terminal 64 and ground with CONSULT-II or tester.
SEF004Y
OK or NG
OK
©
INSPECTION END
NG
©
GO TO 2.(Models with intake air temperature sensor on intake air duct)
GO TO 3. (Models with intake air temperature sensor in mass air flow sensor)
2
CHECK POWER SUPPLY (MODELS WITH INTAKE AIR TEMPERATURE SENSOR ON INTAKE AIR
DUCT)
1. Turn ignition switch “OFF”.
2. Disconnect intake air temperature sensor harness connector.
SEF602Y
3. Turn ignition switch “ON”.
4. Check voltage between terminal 1 and ground with CONSULT-II or tester.
SEF301X
OK or NG
OK
©
GO TO 5.
NG
©
GO TO 4.
INTAKE AIR TEMPERATURE SENSOR
SR20DE
Diagnostic Procedure
EC-941
3
CHECK POWER SUPPLY (MODELS WITH INTAKE AIR TEMPERATURE SENSOR IN MASS AIR FLOW
SENSOR)
1. Turn ignition switch “OFF”.
2. Disconnect intake air temperature sensor (mass air flow sensor) harness connector.
NEF306A
3. Turn ignition switch “ON”.
4. Check voltage between terminal 5 and ground with CONSULT-II or tester.
NEF307A
OK or NG
OK
©
GO TO 5.
NG
©
GO TO 4.
4
DETECT MALFUNCTIONING PART
Check the following.
+
Harness connectors E75, F35 (where fitted)
+
Harness for open or short between ECM and intake air temperature sensor
©
Repair harness or connectors.
5
CHECK GROUND CIRCUIT
1. Turn ignition switch “OFF”.
2. Check harness continuity between intake air temperature sensor harness connector ground terminal and engine
ground.
Refer to wiring diagram.
Continuity should exist.
3. Also check harness for short to ground and short to power.
OK or NG
OK
©
GO TO 7.
NG
©
GO TO 6.
INTAKE AIR TEMPERATURE SENSOR
SR20DE
Diagnostic Procedure (Cont’d)
EC-942
6
DETECT MALFUNCTIONING PART
Check the following.
+
Joint connector-1 (where fitted)
+
Harness connectors E75, F35 (where fitted)
+
Harness for open or short between ECM and intake air temperature sensor
+
Harness for open or short between TCM (Transmission Control Module) and intake air temperature sensor (where fit-
ted)
©
Repair open circuit or short to ground or short to power in harness or connectors.
7
CHECK INTAKE AIR TEMPERATURE SENSOR
Refer to “Component Inspection”, EC-943.
OK or NG
OK
©
GO TO 8.
NG
©
Replace intake air temperature sensor.
8
CHECK INTERMITTENT INCIDENT
Perform “TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT”, EC-670.
©
INSPECTION END
SEF913W
Component Inspection
NLEC1778
INTAKE AIR TEMPERATURE SENSOR
NLEC1778S01
Models with Intake Air Temperature Sensor on Intake
Air Duct
NLEC1778S0101
Check resistance as shown in the figure.
SEF012P
<Reference data>
Intake air temperature °C (°F)
Resistance k
Ω
20 (68)
2.1 - 2.9
80 (176)
0.27 - 0.38
If NG, replace intake air temperature sensor.
SEF012P
Models with Intake Air Temperature Sensor in Mass Air
Flow Sensor
NLEC1778S0102
Check resistance between intake air temperature sensor (mass air
flow sensor) terminal 3 and 5.
<Reference data>
Intake air temperature °C (°F)
Resistance k
Ω
20 (68)
2.1 - 2.9
80 (176)
0.27 - 0.38
If NG, replace intake air temperature sensor (mass air flow sensor).
INTAKE AIR TEMPERATURE SENSOR
SR20DE
Diagnostic Procedure (Cont’d)
EC-943
SEF463R
SEF288D
Component Description
NLEC1780
The heated oxygen sensor 1 (front) is placed into the exhaust
manifold. It detects the amount of oxygen in the exhaust gas com-
pared to the outside air. The heated oxygen sensor 1 (front) has a
closed-end tube made of ceramic zirconia. The zirconia generates
voltage from approximately 1V in richer conditions to 0V in leaner
conditions. The heated oxygen sensor 1 (front) signal is sent to the
ECM. The ECM adjusts the injection pulse duration to achieve the
ideal air-fuel ratio. The ideal air-fuel ratio occurs near the radical
change from 1V to 0V.
CONSULT-II Reference Value in Data Monitor
Mode
NLEC1781
Specification data are reference values.
MONITOR ITEM
CONDITION
SPECIFICATION
HO2S1 (B1)
+
Engine: After warming up
Maintaining engine speed at 2,000
rpm
0 - 0.3V
←→
Approx. 0.6 - 1.0V
HO2S1 MNTR
(B1)
LEAN
←→
RICH
Changes more than 5 times during
10 seconds.
ECM Terminals and Reference Value
NLEC1782
Specification data are reference values and are measured between each terminal and ground.
CAUTION:
Do not use ECM ground terminals when measuring input/output voltage. Doing so may result in dam-
age to the ECM’s transistor. Use a ground other than ECM terminals, such as the ground.
TERMI-
NAL
NO.
WIRE
COLOR
ITEM
CONDITION
DATA (DC Voltage)
62
W
Heated oxygen sensor
1 (front)
[Engine is running]
+
After warming up to normal operating temperature
and engine speed is 2,000 rpm
0 - Approximately 1.0V
SEF008W
HEATED OXYGEN SENSOR 1 (FRONT)
SR20DE
Component Description
EC-944
Wiring Diagram
NLEC1786
MODELS WITH ECM IN ENGINE COMPARTMENT
NLEC1786S03
YEC744
HEATED OXYGEN SENSOR 1 (FRONT)
SR20DE
Wiring Diagram
EC-945
MODELS WITH ECM IN CABIN
NLEC1786S04
YEC931
HEATED OXYGEN SENSOR 1 (FRONT)
SR20DE
Wiring Diagram (Cont’d)
EC-946
Diagnostic Procedure
NLEC1789
1
INSPECTION START
Do you have CONSULT-II?
Yes or No
Yes
©
GO TO 2.
No
©
GO TO 3.
2
CHECK OVERALL FUNCTION
With CONSULT-II
1. Start engine and warm it up to normal operating temperature.
2. Select “HO2S1 MNTR (B1)” in “DATA MONITOR” mode with CONSULT-II.
3. Keep the engine speed at 2,000 rpm under no load, and make sure that the monitors fluctuate between LEAN and
RICH more than five times in 10 seconds.
SEF218Z
OK or NG
OK
©
INSPECTION END
NG
©
GO TO 4.
3
CHECK OVERALL FUNCTION
Without CONSULT-II
1. Start engine and warm it up to normal operating temperature.
2. Stop engine and wait at least 10 seconds.
3. Set ECM in “Diagnostic test mode - II [Heated oxygen sensor 1 monitor (front)]”. Refer to “How to Switch Diagnostic
Test Modes”, EC-600.
4. Keep the engine speed at 2,000 rpm under no load, and make sure that the MI comes ON more than five times in 10
seconds.
SAT652J
OK or NG
OK
©
INSPECTION END
NG
©
GO TO 4.
HEATED OXYGEN SENSOR 1 (FRONT)
SR20DE
Diagnostic Procedure
EC-947
4
RETIGHTEN GROUND SCREWS
1. Turn ignition switch “OFF”.
2. Loosen and retighten engine ground screws.
SEF202X
3. Disconnect heated oxygen sensor 1 (HO2S1) (front) harness connector.
SEF774Z
©
GO TO 5.
5
RETIGHTEN HEATED OXYGEN SENSOR 1 (FRONT)
Loosen and retighten corresponding heated oxygen sensor 1 (front).
Tightening torque:
40 - 60 N·m (4.1 - 6.1 kg-m, 30 - 44 ft-lb)
©
GO TO 6.
6
CHECK INPUT SIGNAL CIRCUIT
1. Disconnect ECM harness connector.
2. Check harness continuity between ECM terminal 62 and HO2S1 terminal 2.
Refer to wiring diagram.
Continuity should exist.
3. Check harness continuity between ECM terminal 62 (or HO2S1 terminal 2) and ground.
Continuity should not exist.
4. Also check harness for short to power.
OK or NG
OK
©
GO TO 7.
NG
©
Repair open circuit or short to ground or short to power in harness or connectors.
HEATED OXYGEN SENSOR 1 (FRONT)
SR20DE
Diagnostic Procedure (Cont’d)
EC-948
7
CHECK HEATED OXYGEN SENSOR 1 (FRONT)
Refer to “Component Inspection”, EC-949.
OK or NG
OK
©
GO TO 8.
NG
©
Replace heated oxygen sensor 1 (front).
8
CHECK INTERMITTENT INCIDENT
Perform “TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT”, EC-670.
©
INSPECTION END
SEF646Y
SEF217YA
Component Inspection
NLEC1790
HEATED OXYGEN SENSOR 1 (FRONT)
NLEC1790S01
With CONSULT-II
1)
Start engine and warm it up to normal operating temperature.
2)
Select “MANU TRIG” in “DATA MONITOR” mode, and select
“HO2S1 (B1)” and “HO2S1 MNTR (B1)”.
3)
Hold engine speed at 2,000 rpm under no load during the fol-
lowing steps.
4)
Touch “RECORD” on CONSULT-II screen.
5)
Check the following.
+
“HO2S1 MNTR (B1)” in “DATA MONITOR” mode changes from
“RICH” to “LEAN” to “RICH” 5 times in 10 seconds.
5 times (cycles) are counted as shown below:
R = “HO2S1 MNTR (B1)”, “RICH”
L = “HO2S1 MNTR (B1)”, “LEAN”
+
“HO2S1 (B1)” voltage goes above 0.6V at least once.
+
“HO2S1 (B1)” voltage goes below 0.3V at least once.
+
“HO2S1 (B1)” voltage never exceeds 1.0V.
CAUTION:
+
Discard any heated oxygen 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 oxygen sensor, clean exhaust sys-
tem threads using Oxygen Sensor Thread Cleaner tool
and approved anti-seize lubricant.
HEATED OXYGEN SENSOR 1 (FRONT)
SR20DE
Diagnostic Procedure (Cont’d)
EC-949
SEF648Y
SEF011X
Without CONSULT-II
1)
Start engine and warm it up to normal operating temperature.
2)
Set voltmeter probes between ECM terminal 62 (HO2S1 sig-
nal) and engine ground.
3)
Check the following with engine speed held at 2,000 rpm con-
stant under no load.
+
Malfunction indicator goes on more than five times within 10
seconds in Diagnostic Test Mode II [HEATED OXYGEN SEN-
SOR 1 MONITOR (FRONT).]
+
The maximum voltage is over 0.6V at least one time.
+
The minimum voltage is below 0.3V at least one time.
+
The voltage never exceeds 1.0V.
CAUTION:
+
Discard any heated oxygen 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 oxygen sensor, clean exhaust sys-
tem threads using Oxygen Sensor Thread Cleaner tool
and approved anti-seize lubricant.
HEATED OXYGEN SENSOR 1 (FRONT)
SR20DE
Component Inspection (Cont’d)
EC-950
Description
NLEC1791
SYSTEM DESCRIPTION
NLEC1791S01
Sensor
Input Signal to ECM
ECM func-
tion
Actuator
Camshaft position sensor
Engine speed
Heated
oxygen
sensor 1
heater
(front) con-
trol
Heated oxygen sensor 1 heater
(front)
The ECM performs ON/OFF control of the heated oxygen sensor 1 heater (front) corresponding to the engine
operating condition.
OPERATION
NLEC1791S02
Engine speed
Heated oxygen sensor 1 heater (front)
Above 3,200 rpm
OFF
Below 3,200 rpm
ON
CONSULT-II Reference Value in Data Monitor
Mode
NLEC1792
Specification data are reference values.
MONITOR ITEM
CONDITION
SPECIFICATION
HO2S1 HTR (B1)
+
Engine speed: Below 3,200 rpm
ON
+
Engine speed: Above 3,200 rpm
OFF
ECM Terminals and Reference Value
NLEC1793
Specification data are reference values and are measured between each terminal and ground.
CAUTION:
Do not use ECM ground terminals when measuring input/output voltage. Doing so may result in dam-
age to the ECM’s transistor. Use a ground other than ECM terminals, such as the ground.
TERMI-
NAL NO.
WIRE
COLOR
ITEM
CONDITION
DATA (DC Voltage)
4
L
Heated oxygen sensor 1
heater (front)
[Engine is running]
+
Engine speed is below 3,200 rpm.
Approximately 0V
[Engine is running]
+
Engine speed is above 3,200 rpm.
BATTERY VOLTAGE
(11 - 14V)
HEATED OXYGEN SENSOR 1 HEATER (FRONT)
SR20DE
Description
EC-951
Wiring Diagram
NLEC1794
MODELS WITH ECM IN ENGINE COMPARTMENT
NLEC1794S03
YEC745
HEATED OXYGEN SENSOR 1 HEATER (FRONT)
SR20DE
Wiring Diagram
EC-952
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