Nissan Qashqai (2007-2010). Manual - part 417

HO2S1

EC-1187

< COMPONENT DIAGNOSIS >

[MR20DE (WITHOUT EURO-OBD)]

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HO2S1

Description

INFOID:0000000001102117

The heated oxygen sensor 1 is placed into the exhaust manifold. It
detects the amount of oxygen in the exhaust gas compared to the
outside air. The heated oxygen sensor 1 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 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.

Component Function Check

INFOID:0000000001102118

1.

CHECK HEATED OXYGEN SENSOR 1 FUNCTION

With CONSULT-III

1.

Start engine and warm it up to normal operating temperature.

2.

Select “HO2S1 MNITOR (B1)” in “DATA MONITOR” mode with CONSULT-III.

3.

Keep the engine speed at 2,000 rpm under no load, and make
sure that the monitors fluctuates between LEAN and RICH more
than five times in 10 seconds.

 Without CONSULT-III

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).

SEF463R

SEF288D

1 times: RICH 

→

LEAN

→

 RICH

2 times: RICH 

→

LEAN

→

RICH

→

LEAN

→

 RICH

SEF217YA

EC-1188

< COMPONENT DIAGNOSIS >

[MR20DE (WITHOUT EURO-OBD)]

HO2S1

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.

Is the inspection result normal?

YES

>> INSPECTION END.

NO

>> Go to 

EC-146, "Diagnosis Procedure"

.

Diagnosis Procedure

INFOID:0000000001102119

1.

CHECK GROUND CONNECTION

1.

Turn ignition switch OFF.

2.

Check ground connection E21. Refer to Ground Inspection in 

GI-41, "Circuit Inspection"

.

Is the inspection result normal?

YES

>> GO TO 2

NO

>> Repair or replace ground connection.

2.

RETIGHTEN HEATED OXYGEN SENSOR 1

Loosen and retighten the heated oxygen sensor 1.

>> GO TO 3.

3.

CHECK EXHAUST GAS LEAK

1.

Start engine and run it at idle.

2.

Listen for an exhaust gas leak before three way catalyst (manifold).

Is exhaust gas leak detected?

YES

>> Repair or replace.

NO

>> GO TO 4.

4.

CHECK FOR INTAKE AIR LEAK

Listen for an intake air leak after the mass air flow sensor.

Is intake air leak detected?

YES

>> Repair or replace.

NO

>> GO TO 5.

5.

CHECK HO2S1 GROUND CIRCUIT FOR OPEN AND SHORT

1.

Turn ignition switch OFF.

SAT652J

Tightening torque: 50 N-m (5.1 kg-m, 37 ft-lb)

SEC502D

HO2S1

EC-1189

< COMPONENT DIAGNOSIS >

[MR20DE (WITHOUT EURO-OBD)]

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2.

Disconnect heated oxygen sensor 1 harness connector.

3.

Disconnect ECM harness connector.

4.

Check harness continuity between HO2S1 harness connector and ECM harness connector.

5.

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

Is the inspection result normal?

YES

>> GO TO 6.

NO

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

6.

CHECK HEATED OXYGEN SENSOR 1 INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT

1.

Check the continuity between HO2S1 harness connector and ECM harness connector.

2.

Check the continuity between HO2S1 harness connector or ECM harness connector and ground.

3.

Also check harness for short to power.

Is the inspection result normal?

YES

>> GO TO 7.

NO

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

7.

CHECK MASS AIR FLOW SENSOR

Check mass air flow sensor.
Refer to 

EC-1081, "Component Inspection"

.

Is the inspection result normal?

YES

>> GO TO 8.

NO

>> Replace mass air flow sensor.

8.

CHECK PCV VALVE

Refer to 

EC-935, "Component Inspection"

.

Is the inspection result normal?

YES

>> GO TO 9.

NO

>> Repair or replace PCV valve.

9.

CHECK HEATED OXYGEN SENSOR 1

Perform 

EC-1193, "Component Inspection"

.

Is the inspection result normal?

YES

>> GO TO 10.

NO

>> Replace heated oxygen sensor 1.

10.

CHECK INTERMITTENT INCIDENT

Refer to 

GI-39, "Intermittent Incident"

.

>> INSPECTION END

Component Inspection

INFOID:0000000001102120

HO2S1

ECM

Continuity

Connector

Terminal

Connector

Terminal

F30

1

F8

56

existed

HO2S1

ECM

Continuity

Connector

Terminal

Connector

Terminal

F30

1

F8

56

Existed

HO2S1

ECM

Ground

Continuity

Connector

Terminal

Connector

Terminal

F30

4

F8

49

Ground

Not existed

EC-1190

< COMPONENT DIAGNOSIS >

[MR20DE (WITHOUT EURO-OBD)]

HO2S1

1.

INSPECTION START

Do you have CONSULT-III?
Do you have CONSULT-III?

YES

>> GO TO 2.

NO

>> GO TO 3.

2.

CHECK HEATED OXYGEN SENSOR 1

 With CONSULT-III

1.

Start engine and warm it up to normal operating temperature.

2.

Set “POST TRIGGER” to 100% in “DATA MONITOR” mode with CONSULT-II. 

3.

Select “HO2S1 (B1)” and “HO2S1 MNTR (B1)”.

4.

Hold engine speed at 2,000 rpm under no load during the following steps.

5.

Touch “RECORD” on CONSULT-II screen.

6.

Check the following.

-

“HO2S1 MNTR (B1)” in “DATA MONITOR” mode changes from
“RICH” to “LEAN” to “RICH” more than 5 times in 10 seconds.

5 times (cycles) are counted as shown in the figure.

-

“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 system threads using Oxygen Sensor
Thread Cleaner tool and approved anti-seize lubricant.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> GO TO 3.

3.

CHECK HEATED OXYGEN SENSOR 1

 Without CONSULT-III

1.

Start engine and warm it up to normal operating temperature.

2.

Check the voltage between ECM harness connector and ground under the following condition.

SEF217YA

JMBIA0352ZZ