Content .. 74 75 76 77 ..

Nissan Almera Tino V10 (2001 year). Manual - part 76

CHECK INPUT SIGNAL CIRCUIT

1. Disconnect heated oxygen sensor 2 (rear) harness connector and ECM harness connector.

SEF639Z

2. Check harness continuity between ECM terminal 63 and HO2S2 terminal 1.

Refer to wiring diagram.

Continuity should exist.

3. Check harness continuity between ECM terminal 63 (or HO2S2 terminal 1) and ground.

Continuity should not exist.

4. Also check harness for short to ground and short to power.

OK or NG

GO TO 4.

Repair open circuit or short to ground or short to power in harness or connectors.

CHECK GROUND CIRCUIT

1. Check harness continuity between HO2S2 terminal 4 and engine ground.

Refer to wiring diagram.

Continuity should exist.

2. Also check harness short to power.

OK or NG

GO TO 6.

GO TO 5.

DETECT MALFUNCTIONING PART

Check the following.

Joint connector-2 (where fitted)

Joint connector F46 (where fitted)

Harness for open or short between heated oxygen sensor 2 (rear) and engine ground.

Repair open circuit or short to power in harness or connectors.

CHECK HEATED OXYGEN SENSOR 2 (REAR)

Refer to “Component Inspection”, EC-778.

OK or NG

GO TO 7.

Replace heated oxygen sensor 2 (rear).

CHECK INTERMITTENT INCIDENT

Perform “TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT”, EC-670.

INSPECTION END

DTC P0139 HEATED OXYGEN SENSOR 2 (REAR)

(RESPONSE MONITORING)

SR20DE

Diagnostic Procedure (Cont’d)

EC-777

SEF662Y

Component Inspection

NLEC1489

HEATED OXYGEN SENSOR 2 (REAR)

NLEC1489S01

With CONSULT-II

Start engine and drive vehicle at a speed of more than 70 km/h
(43 MPH) for 2 consecutive minutes.

Stop vehicle with engine running.

Select “FUEL INJECTION” in “ACTIVE TEST” mode, and
select “HO2S2 (B1)” as the monitor item with CONSULT-II.

Check “HO2S2 (B1)” at idle speed when adjusting “FUEL
INJECTION” to

25%.

“HO2S2 (B1)” should be above 0.68V at least once when
the “FUEL INJECTION” is +25%.
“HO2S2 (B1)” should be below 0.45V at least once when
the “FUEL INJECTION” is −25%.

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.

SEF244YC

SEF032X

Without CONSULT-II

Start engine and drive vehicle at a speed of more than 70 km/h
(43 MPH) for 2 consecutive minutes.

Stop vehicle with engine running.

Set voltmeter probes between ECM terminals 63 (HO2S2 sig-
nal) and engine ground.

Check the voltage when revving up to 4,000 rpm under no load
at least 10 times.
(Depress and release accelerator pedal as soon as possible.)
The voltage should be above 0.68V at least once.
If the voltage is above 0.68V at step 4, step 5 is not nec-
essary.

Keep vehicle at idling for 10 minutes, then check the voltage.
Or check the voltage when coasting from 80 km/h (50 MPH)
in D position with “SPORTS MODE SW” OFF.
The voltage should be below 0.45V at least once.

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.

DTC P0139 HEATED OXYGEN SENSOR 2 (REAR)

(RESPONSE MONITORING)

SR20DE

Component Inspection

EC-778

SEF327R

Component Description

NLEC1490

The heated oxygen sensor 2 (rear), after three way catalyst, moni-
tors the oxygen level in the exhaust gas.
Even if switching characteristics of the heated oxygen sensor 1
(front) are shifted, the air fuel ratio is controlled to stoichiometric,
by the signal from the heated oxygen sensor 2 (rear).
This sensor is made of ceramic zirconia. The zirconia generates
voltage from approximately 1V in richer conditions to 0V in leaner
conditions.
Under normal conditions the heated oxygen sensor 2 (rear) is not
used for engine control operation.

CONSULT-II Reference Value in Data Monitor
Mode

NLEC1491

Specification data are reference values.

MONITOR ITEM

CONDITION

SPECIFICATION

HO2S2 (B1)

Engine: After warming up

Revving engine from idle to 3,000
rpm

0 - 0.3V

←→

Approx. 0.6 - 1.0V

HO2S2 MNTR
(B1)

LEAN

←→

RICH

ECM Terminals and Reference Value

NLEC1492

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)

Heated oxygen sensor 2
(rear)

[Engine is running]

After warming up to normal operating tempera-
ture and revving engine from idle to 2,000 rpm

0 - Approximately 1.0V

SEF305U

On Board Diagnosis Logic

NLEC1493

The heated oxygen sensor 2 (rear) has a much longer switching
time between rich and lean than the heated oxygen sensor 1
(front). The oxygen storage capacity before the three way catalyst
causes the longer switching time. To judge the malfunctions of
heated oxygen sensor 2 (rear), ECM monitors whether or not the
voltage is too high during various driving conditions such as fuel-
cut.

DTC No.

Malfunction is detected when ...

Check Items (Possible Cause)

P0140

An excessively high voltage from the sensor is sent to
ECM.

Harness or connectors
(The sensor circuit is open or shorted.)

Heated oxygen sensor 2 (rear)

DTC P0140 HEATED OXYGEN SENSOR 2 (REAR)

(HIGH VOLTAGE)

SR20DE

Component Description

EC-779

SEF189Y

DTC Confirmation Procedure

NLEC1494

NOTE:
If “DTC Confirmation Procedure” has been previously conducted,
always turn ignition switch “OFF” and wait at least 10 seconds
before conducting the next test.

With CONSULT-II

Turn ignition switch “ON” and select “DATA MONITOR” mode
with CONSULT-II.

Start engine and drive vehicle at a speed of more than 70 km/h
(43 MPH) for 2 consecutive minutes.

Stop vehicle with engine running.

Let engine idle for 1 minute.

Maintain the following conditions for at least 5 consecutive
seconds.

ENG SPEED

1,400 - 3,300 rpm

VHCL SPEED SE

68 - 130 km/h (48 - 81 MPH)

B/FUEL SCHDL

3.0 - 14.0 msec

COOLAN TEMP/S

More than 70°C (158°F)

Selector lever

Suitable position

If 1st trip DTC is detected, go to “Diagnostic Procedure”,
EC-783.

SEF032X

Overall Function Check

NLEC1495

Use this procedure to check the overall function of the heated oxy-
gen sensor 2 (rear) circuit. During this check, a 1st trip DTC might
not be confirmed.

With GST

Start engine and drive vehicle at a speed of more than 70 km/h
(43 MPH) for 2 consecutive minutes.

Stop vehicle with engine running.

Set voltmeter probes between ECM terminals 63 (HO2S2 sig-
nal) and engine ground.

Check the voltage after revving up to 4,000 rpm under no load
at least 10 times.
(Depress and release accelerator pedal as soon as possible.)
The voltage should be below 2V during this procedure.

If NG, go to “Diagnostic Procedure”, EC-783.

DTC P0140 HEATED OXYGEN SENSOR 2 (REAR)

(HIGH VOLTAGE)

SR20DE

DTC Confirmation Procedure

EC-780

Wiring Diagram

NLEC1496

MODELS WITH ECM IN ENGINE COMPARTMENT

NLEC1496S03

YEC693

DTC P0140 HEATED OXYGEN SENSOR 2 (REAR)

(HIGH VOLTAGE)

SR20DE

Wiring Diagram

EC-781

MODELS WITH ECM IN CABIN

NLEC1496S04

YEC918

DTC P0140 HEATED OXYGEN SENSOR 2 (REAR)

(HIGH VOLTAGE)

SR20DE

Wiring Diagram (Cont’d)

EC-782

Diagnostic Procedure

NLEC1497

RETIGHTEN GROUND SCREWS

1. Turn ignition switch “OFF”.
2. Loosen and retighten engine ground screws.

SEF202X

GO TO 2.

CHECK INPUT SIGNAL CIRCUIT

1. Disconnect heated oxygen sensor 2 (rear) harness connector and ECM harness connector.

SEF639Z

2. Check harness continuity between ECM terminal 63 and HO2S2 terminal 1.

Refer to wiring diagram.

Continuity should exist.

3. Check harness continuity between ECM terminal 63 (or HO2S2 terminal 1) and ground.

Continuity should not exist.

4. Also check harness for short to ground and short to power.

OK or NG

GO TO 3.

Repair open circuit or short to ground or short to power in harness or connectors.

CHECK GROUND CIRCUIT

1. Check harness continuity between HO2S2 terminal 4 and engine ground.

Refer to wiring diagram.

Continuity should exist.

2. Also check harness for short to power.

OK or NG

GO TO 5.

GO TO 4.

DTC P0140 HEATED OXYGEN SENSOR 2 (REAR)

(HIGH VOLTAGE)

SR20DE

Diagnostic Procedure

EC-783

DETECT MALFUNCTIONING PART

Check the following.

Joint connector-2 (where fitted)

Joint connector F46 (where fitted)

Harness for open or short between heated oxygen sensor 2 (rear) and ECM.

Repair open circuit or short to power in harness or connectors.

CHECK HARNESS CONNECTOR

Check heated oxygen sensor 2 (rear) harness connector for water.
Water should not exist.

OK or NG

GO TO 6.

Repair or replace harness connector.

CHECK HEATED OXYGEN SENSOR 2 (REAR)

Refer to “Component Inspection”, EC-784.

OK or NG

GO TO 7.

Replace heated oxygen sensor 2 (rear).

CHECK INTERMITTENT INCIDENT

Perform “TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT”, EC-670.

INSPECTION END

SEF662Y

Component Inspection

NLEC1498

HEATED OXYGEN SENSOR 2 (REAR)

NLEC1498S01

With CONSULT-II

Start engine and drive vehicle at a speed of more than 70 km/h
(43 MPH) for 2 consecutive minutes.

Stop vehicle with engine running.

Select “FUEL INJECTION” in “ACTIVE TEST” mode, and
select “HO2S2 (B1)” as the monitor item with CONSULT-II.

Check “HO2S2 (B1)” at idle speed when adjusting “FUEL
INJECTION” to

25%.

“HO2S2 (B1)” should be above 0.68V at least once when
the “FUEL INJECTION” is +25%.
“HO2S2 (B1)” should be below 0.45V at least once when
the “FUEL INJECTION” is −25%.

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.

DTC P0140 HEATED OXYGEN SENSOR 2 (REAR)

(HIGH VOLTAGE)

SR20DE

Diagnostic Procedure (Cont’d)

EC-784

SEF244YC

SEF032X

Without CONSULT-II

Start engine and drive vehicle at a speed of more than 70 km/h
(43 MPH) for 2 consecutive minutes.

Stop vehicle with engine running.

Set voltmeter probes between ECM terminals 63 (HO2S2 sig-
nal) and engine ground.

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.

DTC P0140 HEATED OXYGEN SENSOR 2 (REAR)

(HIGH VOLTAGE)

SR20DE

Component Inspection (Cont’d)

EC-785

Description

NLEC1499

SYSTEM DESCRIPTION

NLEC1499S01

Sensor

Input Signal to ECM

ECM function

Actuator

Camshaft position sensor

Engine speed

Heated oxygen sensor
2 heater (rear) control

Heated oxygen sensor 2 heater
(rear)

The ECM performs ON/OFF control of the heated oxygen sensor 2 heater (rear) corresponding to the engine
speed.

OPERATION

NLEC1499S02

Engine condition

Heated oxygen sensor 2 heater (rear)

Engine stopped

OFF

Engine is running.

Engine speed below 3,600 rpm
After driving for 2 minutes at a speed
of 70 km/h (43 MPH) or more

Engine speed above 3,600 rpm

OFF

CONSULT-II Reference Value in Data Monitor
Mode

NLEC1500

Specification data are reference values.

MONITOR ITEM

CONDITION

SPECIFICATION

HO2S2 HTR (B1)

Engine speed

Below 3,600 rpm [After driving for 2 minutes at a
speed of 70 km/h (43 MPH) or more]

Above 3,600 rpm

OFF

Ignition switch ON (Engine stopped)

OFF

ECM Terminals and Reference Value

NLEC1501

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)

W/R

Heated oxygen sensor 2
heater (rear)

[Engine is running]

Engine speed is below 3,600 rpm [After driving
for 2 minutes at a speed of 70 km/h (43 MPH) or
more]

Approximately 0.7V

[Engine is running]

Engine speed is above 3,600 rpm

BATTERY VOLTAGE
(11 - 14V)

[Ignition switch “ON”]

Engine stopped

On Board Diagnosis Logic

NLEC1502

DTC No.

Malfunction is detected when ...

Check Items (Possible Cause)

P0141

The current amperage in the heated oxygen sensor 2
heater (rear) circuit is out of the normal range.
[An improper voltage drop signal is sent to ECM through
the heated oxygen sensor 2 heater (rear).]

Harness or connectors
(The heated oxygen sensor 2 heater (rear) cir-
cuit is open or shorted.)

Heated oxygen sensor 2 heater (rear)

DTC P0141 HEATED OXYGEN SENSOR 2 HEATER (REAR)

SR20DE

Description

EC-786

DTC Confirmation Procedure

NLEC1503

NOTE:
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 bat-
tery voltage is in between 10.5V and 16V at idle.

SEF175Y

With CONSULT-II

Turn ignition switch “ON” and select “DATA MONITOR” mode
with CONSULT-II.

Start engine and drive vehicle at a speed of more than 70 km/h
(43 MPH) for 2 consecutive minutes.

If 1st trip DTC is detected, go to “Diagnostic Procedure”,
EC-790.

With GST

Start engine and drive vehicle at a speed of more than 70 km/h
(43 MPH) for 2 consecutive minutes.

Turn ignition switch “OFF” and wait at least 10 seconds.

Start engine and drive vehicle at a speed of more than 70 km/h
(43 MPH) for 2 consecutive minutes.

Select “MODE 3” with GST.

If DTC is detected, go to “Diagnostic Procedure”, EC-790.

When using GST, “DTC Confirmation Procedure” should be
performed twice as much as when using CONSULT-II because
GST cannot display MODE 7 (1st trip DTC) concerning this
diagnosis. Therefore, using CONSULT-II is recommended.

DTC P0141 HEATED OXYGEN SENSOR 2 HEATER (REAR)

SR20DE

DTC Confirmation Procedure

EC-787

Wiring Diagram

NLEC1504

MODELS WITH ECM IN ENGINE COMARTMENT

NLEC1504S03

YEC694

DTC P0141 HEATED OXYGEN SENSOR 2 HEATER (REAR)

SR20DE

Wiring Diagram

EC-788

MODELS WITH ECM IN CABIN

NLEC1504S04

YEC919

DTC P0141 HEATED OXYGEN SENSOR 2 HEATER (REAR)

SR20DE

Wiring Diagram (Cont’d)

EC-789

Diagnostic Procedure

NLEC1505

CHECK POWER SUPPLY

1. Turn ignition switch “OFF”.
2. Disconnect heated oxygen sensor 2 (rear) harness connector.

SEF639Z

3. Turn ignition switch “ON”.
4. Check voltage between HO2S2 terminal 2 and ground.

SEF218W

Voltage: Battery voltage

OK or NG

GO TO 3.

GO TO 2.

DETECT MALFUNCTIONING PART

Check the following.

Harness connectors F38, M50 (where fitted)

Harness connectors M72, F44 (where fitted)

Harness for open or short between heated oxygen sensor 2 (rear) and fuse

10A fuse

Repair harness or connectors.

CHECK OUTPUT CIRCUIT

1. Turn ignition switch “OFF”.
2. Disconnect ECM harness connector.
3. Check harness continuity between HO2S2 terminal 3 and ECM terminal 3.

Refer to wiring diagram.

Continuity should exist.

4. Also check harness for short to ground and short to power.

OK or NG

GO TO 5.

GO TO 4.

DTC P0141 HEATED OXYGEN SENSOR 2 HEATER (REAR)

SR20DE

Diagnostic Procedure

EC-790

DETECT MALFUNCTIONING PART

Check the harness for open or short between heated oxygen sensor 2 heater (rear) and ECM.

Repair open circuit or short to ground or short to power in harness or connectors.

CHECK HEATED OXYGEN SENSOR 2 HEATER (REAR)

Refer to “Component Inspection”, EC-791.

OK or NG

GO TO 6.

Replace heated oxygen sensor 2 (rear).

CHECK INTERMITTENT INCIDENT

Perform “TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT”, EC-670.

INSPECTION END

SEF221W

Component Inspection

NLEC1506

HEATED OXYGEN SENSOR 2 HEATER (REAR)

NLEC1506S01

Check the following.
1.

Check resistance between terminals 2 and 3.

Resistance: 2.3 - 4.3

Ω

at 25°C (77°F)

Check continuity.

Terminal No.

Continuity

1 and 2, 3, 4

4 and 1, 2, 3

If NG, replace the heated oxygen sensor 2 (rear).

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.

DTC P0141 HEATED OXYGEN SENSOR 2 HEATER (REAR)

SR20DE

Diagnostic Procedure (Cont’d)

EC-791

On Board Diagnosis Logic

NLEC1507

With the Air/Fuel Mixture Ratio Self-Learning Control, the actual mixture ratio can be brought closely to the
theoretical mixture ratio based on the mixture ratio feedback signal from the heated oxygen sensor 1 (front).
The ECM calculates the necessary compensation to correct the offset between the actual and the theoretical
ratios.
In case the amount of the compensation value is extremely large (The actual mixture ratio is too lean.), the
ECM judges the condition as the fuel injection system malfunction and lights up the MIL (2 trip detection logic).

Sensor

Input Signal to ECM

ECM function

Actuator

Heated oxygen sensor 1 (front)

Density of oxygen in exhaust gas
(Mixture ratio feedback signal)

Fuel injection & mixture
ratio control

Injectors

DTC No.

Malfunction is detected when ...

Check Items (Possible Cause)

P0171

Fuel injection system does not operate properly.

The amount of mixture ratio compensation is too large.
(The mixture ratio is too lean.)

Intake air leaks

Heated oxygen sensor 1 (front)

Injectors

Exhaust gas leaks

Incorrect fuel pressure

Lack of fuel

Mass air flow sensor

SEF215Z

SEF058Y

DTC Confirmation Procedure

NLEC1508

NOTE:
If “DTC Confirmation Procedure” has been previously conducted,
always turn ignition switch “OFF” and wait at least 10 seconds
before conducting the next test.

With CONSULT-II

Start engine and warm it up to normal operating temperature.

Turn ignition switch “OFF” and wait at least 10 seconds.

Turn ignition switch “ON” and select “SELF-LEARN CON-
TROL” in “WORK SUPPORT” mode with CONSULT-II.

Clear the self-learning control coefficient by touching “CLEAR”.

Select “DATA MONITOR” mode with CONSULT-II.

Start engine again and let it idle for at least 10 minutes.
The 1st trip DTC P0171 should be detected at this stage, if a
malfunction exists. If so, go to “Diagnostic Procedure”,
EC-796.

If it is difficult to start engine at step 6, the fuel injection sys-
tem has a malfunction.

Crank engine while depressing accelerator pedal. If engine
starts, go to “Diagnostic Procedure”, EC-796. If engine does
not start, visually check for exhaust and intake air leak.

SEF772Z

With GST

Start engine and warm it up to normal operating temperature.

Turn ignition switch “OFF” and wait at least 10 seconds.

Disconnect mass air flow sensor harness connector. Then
restart and run engine for at least 3 seconds at idle speed.

Stop engine and reconnect mass air flow sensor harness con-
nector.

Select “MODE 7” with GST. Make sure 1st trip DTC P0100 is
detected.

Select “MODE 4” with GST and erase the 1st trip DTC P0100.

DTC P0171 FUEL INJECTION SYSTEM FUNCTION

(LEAN SIDE)

SR20DE

On Board Diagnosis Logic

EC-792

Content .. 74 75 76 77 ..