Nissan Almera Tino V10 (2001 year). Manual - part 75

SEF327R

Component Description

NLEC1472

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

NLEC1473

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

NLEC1474

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 engine speed is 2,000 rpm

0 - Approximately 1.0V

SEF259VA

On Board Diagnosis Logic

NLEC1475

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 the maxi-
mum voltage of the sensor is sufficiently high during various driv-
ing conditions such as fuel-cut.

DTC No.

Malfunction is detected when ...

Check Items (Possible Cause)

P0138

The maximum voltage from the sensor does not reach
the specified voltage.

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

Heated oxygen sensor 2 (rear)

Fuel pressure

Injectors

Intake air leaks

DTC P0138 HEATED OXYGEN SENSOR 2 (REAR) (MAX. VOLTAGE

MONITORING)

SR20DE

Component Description

EC-761

DTC Confirmation Procedure

NLEC1907

CAUTION:

Always drive vehicle at a safe speed.
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.

SEF663Y

SEF665Y

TESTING CONDITION:

Always perform at a temperature above −10°C (14°F).

Never stop engine during this procedure. If the engine is
stopped, retry this procedure from step 2.

With CONSULT-II

NOTE:
The figure on the left will be displayed on the CONSULT-II
screen when you start the DTC Work Support. Ignore the first
figure and start the test.
“COMPLETED” will be displayed on the screen as the second
figure when the test is completed properly.
1)

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 “HO2S2 (B1) P0138” of
“HO2S2” in “DTC WORK SUPPORT” mode with CONSULT-II.

Touch “START”.

Start engine and let it idle for at least 30 seconds.

Rev engine up to 2,000 rpm 2 or 3 times quickly under no load.
If “COMPLETED” appears on CONSULT-II screen, go to step
10.
If “COMPLETED” does not appear on CONSULT-II screen, go
to the following step.

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

Additionally, “COMPLETED” will be displayed on the CON-
SULT-II screen when the accelerator pedal is completely
released after the vehicle is driven for 60 seconds or more
under the following conditions.
(If will take approximately 5 seconds.)

ENG SPEED

1,400 - 3,300 rpm

Vehicle speed

68 - 130 km/h (42 - 81 MPH)

B/FUEL SCHDL

3.0 - 14.0 msec

Selector lever

D position (CVT)

NOTE:

If “COMPLETED” appears on the CONSULT-II screen, go
to step 10.

If “COMPLETED” does not appear on the CONSULT-II
screen, go to the following step.

Stop the vehicle and let it idle until “COMPLETED” is displayed
on the CONSULT-II screen. (It will take 6 minutes at the most.)

NOTE:
If “COMPLETED” is not displayed after 6 minutes, retry from
step 2.

DTC P0138 HEATED OXYGEN SENSOR 2 (REAR) (MAX. VOLTAGE

MONITORING)

SR20DE

DTC Confirmation Procedure

EC-762

10) Make sure that “OK” is displayed after touching “SELF-DIAG

RESULTS”.
If “NG” is displayed, refer to “Diagnostic Procedure”, EC-766.

SEF032X

Overall Function Check

NLEC1477

Use this procedure to check the overall function of the rear heated
oxygen sensor circuit. During this check, a 1st trip DTC might not
be confirmed.

With GST

Start engine and drive vehicle at a speed of 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 engine 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 during
this procedure.
If the voltage can be confirmed in step 4, step 5 is not
necessary.

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 above 0.68V at least once during
this procedure.

If NG, go to “Diagnostic Procedure”, EC-766.

DTC P0138 HEATED OXYGEN SENSOR 2 (REAR) (MAX. VOLTAGE

MONITORING)

SR20DE

DTC Confirmation Procedure (Cont’d)

EC-763

Wiring Diagram

NLEC1478

MODELS WITH ECM IN ENGINE COMPARTMENT

NLEC1478S03

YEC693

DTC P0138 HEATED OXYGEN SENSOR 2 (REAR) (MAX. VOLTAGE

MONITORING)

SR20DE

Wiring Diagram

EC-764

MODELS WITH ECM IN CABIN

NLEC1478S04

YEC918

DTC P0138 HEATED OXYGEN SENSOR 2 (REAR) (MAX. VOLTAGE

MONITORING)

SR20DE

Wiring Diagram (Cont’d)

EC-765

Diagnostic Procedure

NLEC1479

RETIGHTEN GROUND SCREWS

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

SEF202X

GO TO 2.

DTC P0138 HEATED OXYGEN SENSOR 2 (REAR) (MAX. VOLTAGE

MONITORING)

SR20DE

Diagnostic Procedure

EC-766

CLEAR THE SELF-LEARNING DATA

With CONSULT-II

1. Start engine and warm it up to normal operating temperature.
2. Select “SELF-LEARN CONTROL” in “WORK SUPPORT” mode with CONSULT-II.
3. Clear the self-learning control coefficient by touching “CLEAR”.

SEF215Z

4. Run engine for at least 10 minutes at idle speed.

Is the 1st trip DTC P0171 detected? Is it difficult to start engine?

Without CONSULT-II

1. Start engine and warm it up to normal operating temperature.
2. Turn ignition switch “OFF”.
3. Disconnect mass air flow sensor harness connector, and restart and run engine for at least 3 seconds at idle speed.

SEF772Z

4. Stop engine and reconnect mass air flow sensor harness connector.
5. Make sure 1st trip DTC P0100 is displayed.
6. Erase the 1st trip DTC memory. Refer to “How to Erase Emission-related Diagnostic Information”, EC-594.
7. Make sure DTC P0000 is displayed.
8. Run engine for at least 10 minutes at idle speed.

Is the 1st trip DTC P0171 detected? Is it difficult to start engine?

Yes or No

Yes

Perform trouble diagnosis for DTC P0171. Refer to EC-792.

GO TO 3.

DTC P0138 HEATED OXYGEN SENSOR 2 (REAR) (MAX. VOLTAGE

MONITORING)

SR20DE

Diagnostic Procedure (Cont’d)

EC-767

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 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 for 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-769.

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 P0138 HEATED OXYGEN SENSOR 2 (REAR) (MAX. VOLTAGE

MONITORING)

SR20DE

Diagnostic Procedure (Cont’d)

EC-768

SEF662Y

Component Inspection

NLEC1480

HEATED OXYGEN SENSOR 2 (REAR)

NLEC1480S01

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 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 P0138 HEATED OXYGEN SENSOR 2 (REAR) (MAX. VOLTAGE

MONITORING)

SR20DE

Component Inspection

EC-769

SEF327R

Component Description

NLEC1481

CONSULT-II Reference Value in Data Monitor
Mode

NLEC1482

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

NLEC1483

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

SEF302U

On Board Diagnosis Logic

NLEC1484

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 the switch-
ing response of the sensor’s voltage is faster than specified during
various driving conditions such as fuel-cut.

DTC No.

Malfunction is detected when ...

Check Items (Possible Cause)

P0139

It takes more than the specified time for the sensor to
respond between rich and lean.

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

Heated oxygen sensor 2 (rear)

Fuel pressure

Injectors

Intake air leaks

DTC P0139 HEATED OXYGEN SENSOR 2 (REAR)

(RESPONSE MONITORING)

SR20DE

Component Description

EC-770

DTC Confirmation Procedure

NLEC1908

CAUTION:

SEF666Y

SEF668Y

TESTING CONDITION:

Always perform at a temperature above −10°C (14°F).

Never stop engine during this procedure. If the engine is
stopped, retry this procedure from step 2.

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 “HO2S2 (B1) P0139” of
“HO2S2” in “DTC WORK SUPPORT” mode with CONSULT-II.

Touch “START”.

Start engine and let it idle for at least 30 seconds.

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

ENG SPEED

1,400 - 3,300 rpm

Vehicle speed

68 - 130 km/h (42 - 81 MPH)

B/FUEL SCHDL

3.0 - 14.0 msec

Selector lever

D position

NOTE:

If “COMPLETED” appears on the CONSULT-II screen, go
to step 10.

If “COMPLETED” does not appear on the CONSULT-II
screen, go to the following step.

Stop the vehicle and let it idle until “COMPLETED” is displayed
on the CONSULT-II screen. (It will take 6 minutes at the most.)

NOTE:
If “COMPLETED” is not displayed after 6 minutes, retry from
step 2.

DTC P0139 HEATED OXYGEN SENSOR 2 (REAR)

(RESPONSE MONITORING)

SR20DE

DTC Confirmation Procedure

EC-771

10) Make sure that “OK” is displayed after touching “SELF-DIAG

RESULTS”.
If “NG” is displayed, refer to “Diagnostic Procedure”, EC-775.

SEF032X

Overall Function Check

NLEC1486

Use this procedure to check the overall function of the rear heated
oxygen sensor 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 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 change at more than 0.06V for 1 sec-
ond during this procedure.
If the voltage can be confirmed in step 4, step 5 is not
necessary.

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 change at more than 0.06V for 1 sec-
ond during this procedure.

If NG, go to “Diagnostic Procedure”, EC-775.

DTC P0139 HEATED OXYGEN SENSOR 2 (REAR)

(RESPONSE MONITORING)

SR20DE

DTC Confirmation Procedure (Cont’d)

EC-772

Wiring Diagram

NLEC1487

MODELS WITH ECM IN ENGINE COMPARTMENT

NLEC1487S03

YEC693

DTC P0139 HEATED OXYGEN SENSOR 2 (REAR)

(RESPONSE MONITORING)

SR20DE

Wiring Diagram

EC-773

MODELS WITH ECM IN CABIN

NLEC1487S04

YEC918

DTC P0139 HEATED OXYGEN SENSOR 2 (REAR)

(RESPONSE MONITORING)

SR20DE

Wiring Diagram (Cont’d)

EC-774

Diagnostic Procedure

NLEC1488

RETIGHTEN GROUND SCREWS

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

SEF202X

GO TO 2.

DTC P0139 HEATED OXYGEN SENSOR 2 (REAR)

(RESPONSE MONITORING)

SR20DE

Diagnostic Procedure

EC-775

CLEAR THE SELF-LEARNING DATA

With CONSULT-II

SEF215Z

4. Run engine for at least 10 minutes at idle speed.

Is the 1st trip DTC P0172 detected? Is it difficult to start engine?

Without CONSULT-II

SEF772Z

Is the 1st trip DTC P0172 detected? Is it difficult to start engine?

Yes or No

Yes

Perform trouble diagnosis for DTC P0172. Refer to EC-800.

GO TO 3.

DTC P0139 HEATED OXYGEN SENSOR 2 (REAR)

(RESPONSE MONITORING)

SR20DE

Diagnostic Procedure (Cont’d)

EC-776

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