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Nissan Qashqai (2007-2010). Manual - part 180

P1146 HO2S2

EC-239

< COMPONENT DIAGNOSIS >

[HR16DE (WITH EURO-OBD)]

>> GO TO 3.

PERFORM PROCEDURE FOR COND1

Start engine and warm it up to normal operating temperature.

>> GO TO 4.

PERFORM PROCEDURE FOR COND1-I

Turn ignition switch OFF and wait at least 10 seconds.

>> GO TO 5.

PERFORM PROCEDURE FOR COND1-II

Start engine and keep the engine speed between 3,500 and 4,000 rpm for at least 1 minute under no load.

Let engine idle 1 minute.

Select “HO2S2 (B1) P1146” of “HO2S2” in “DTC WORK SUPPORT” mode with CONSULT-III.

Touch “START”.

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

Rev engine up to 2,000 rpm two or three times quickly under no load.

Is “CONPLETED” appears on CONSULT-III screen?

YES

>> GO TO 7.

>> GO TO 4.

PERFORM PROCEDURE FOR COND1-I

When the following conditions are met, “TESTING” will be displayed at “COND1” on the CONSULT-III screen.
Maintain the condition continuously until “TESTING” changes to “COMPLETED” (It will take approximately 60
seconds.)

Which displayed on CONSULT-III screen?

COND1: OUT OF CONDITION>>GO TO 4.
COND1: COMPLETED COND2: INCOMPLETED>>GO TO 7.
COND1: COMPLETED COND2: COMPLETED>>GO TO 8.

PERFORM PROCEDURE FOR COND2

While driving, release accelerator pedal completely from the above condition until “INCOMPLETED” at
“COND2” on CONSULT-III screen has turned to “COMPLETED”. (It will take approximately 4 seconds.)

Which displayed on CONSULT-III screen?

COND2: COMPLETED COND3: INCOMPLETED>>GO TO 8.
COND2: COMPLETED COND3: COMPLETED>>GO TO 9.

PERFORM PROCEDURE FOR COND3

Stop vehicle and let it idle until “INCOMPLETED” of “COND3” on CONSULT-III screen has turned to “COM-
PLETED”. (It will take a maximum of approximately 6 minutes.)

>> GO TO 9.

PERFORM PROCEDURE FOR COND3-I

Touch “SELF DIAGRESULTS”.

Which displayed on CONSULT-III screen?

>> INSPECTION END

NG >> Go

EC-241, "Diagnosis Procedure"

CAN NOT BE DIAGNOSED>>GO TO 10.

ENG SPEED

More than 1,200 rpm

B/FUEL SCHDL

More than 1.0 msec

COOLAN TEMP/S

More than 70

C (158

Shift level

Suitable position

EC-240

< COMPONENT DIAGNOSIS >

[HR16DE (WITH EURO-OBD)]

P1146 HO2S2

10.

PERFORM PROCEDURE FOR COND3-II

Turn ignition switch OFF and leave the vehicle in a cool place (soak the vehicle).

Turn ignition switch ON and select “COOLAN TEMP/S” in “DATA MONITOR” mode with CONSULT-III.

Start engine and warm it up while monitoring “COOLAN TEMP/S” indication on CONSULT-III.

When “COOLAN TEMP/S” indication reaches to 70

C (158

F).

>> GO TO 5.

11.

PREFORM COMPONENT FUNCTION CHECK

Perform component function check. Refer to

EC-242, "Component Inspection"

NOTE:
Use component function check the overall function of the heated oxygen sensor 2 circuit. During this check, a
1st trip DTC might not be confirmed.

Is the inspection result normal?

YES

>> INSPECTION END

>> Go to

EC-241, "Diagnosis Procedure"

Component Function Check

INFOID:0000000001088481

PERFORM COMPONENT FUNCTION CHECK-I

With GST

Start engine and warm it up to the normal operating temperature.

Turn ignition switch OFF and wait at least 10 seconds.

Start engine and keep the engine speed between 3,500 and 4,000 rpm for at least 1 minute under no load.

Let engine idle for 1 minute.

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

Is the inspection result normal?

YES

>> INSPECTION END

>> GO TO 2.

PERFORM COMPONENT FUNCTION CHECK-II

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

Is the inspection result normal?

YES

>> INSPECTION END

>> GO TO 3.

PERFORM COMPONENT FUNCTION CHECK-III

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

Is the inspection result normal?

ECM

Ground

Condition

Voltage

Connector

Terminal

(HO2S2 signal)

Ground

Revving up to 4,000 rpm under no
load at least 10 times

The voltage should be above 0.68V at least once during
this procedure.

ECM

Ground

Condition

Voltage

Connector

Terminal

(HO2S2 signal)

Ground

Keeping engine speed at idle for 10 minutes

The voltage should be above 0.68V at least
once during this procedure.

ECM

Ground

Condition

Voltage

Connector

Terminal

(HO2S2 signal)

Ground

Coasting from 80 km/h (50 MPH) in 4th gear po-
sition

The voltage should be above 0.68V at least
once during this procedure.

P1146 HO2S2

EC-241

< COMPONENT DIAGNOSIS >

[HR16DE (WITH EURO-OBD)]

YES

>> INSPECTION END

>> Go to

EC-241, "Diagnosis Procedure"

Diagnosis Procedure

INFOID:0000000001088482

CHECK GROUND CONNECTION

Turn ignition switch OFF.

Check ground connection E21. Refer to Ground Inspection in

GI-41, "Circuit Inspection"

Is the inspection result normal?

YES

>> GO TO 2.

>> Repair or replace ground connection.

CLEAR THE SELF-LEARNING DATA

Clear the mixture ratio self-learning value, refer to

EC-33, "MIXTURE RATIO SELF-LEARNING VALUE

CLEAR : Special Repair Requirement"

Run engine for at least 10 minutes at idle speed.

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

YES

>> Perform trouble diagnosis for DTC P0172. Refer to

EC-178, "DTC Logic"

>> GO TO 3.

CHECK HO2S2 GROUND CIRCUIT FOR OPEN AND SHORT

Turn ignition switch OFF.

Disconnect heated oxygen sensor 2 harness connector.

Disconnect ECM harness connector.

Check the continuity between HO2S2 harness connector and ECM harness connector.

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

Is the inspection result normal?

YES

>> GO TO 5.

>> GO TO 4.

DETECT MALFUNCTIONING PART

Check the following.
• Harness connectors F121, E7
• Harness for open or short between HO2S2 and ECM

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

CHECK HO2S2 INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT

Check the continuity between HO2S2 harness connector and ECM harness connector.

Check the continuity between HO2S2 harness connector or ECM harness connector and ground.

Also check harness for short to power.

HO2S2

ECM

Continuity

Connector

Terminal

Connector

Terminal

E58

Existed

HO2S2

ECM

Continuity

Connector

Terminal

Connector

Terminal

E58

Existed

HO2S2

ECM

Ground

Continuity

Connector

Terminal

Connector

Terminal

E58

Ground

Not existed

EC-242

< COMPONENT DIAGNOSIS >

[HR16DE (WITH EURO-OBD)]

P1146 HO2S2

Is the inspection result normal?

YES

>> GO TO 7.

>> GO TO 6..

DETECT MALFUNCTIONING PART

Check the following.
• Harness connectors F121, E7
• Harness for open or short between HO2S2 and ECM

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

CHECK HEATED OXYGEN SENSOR 2

Refer to

EC-242, "Component Inspection"

Is the inspection result normal?

YES

>> GO TO 9.

>> GO TO 8.

REPLACE HEATED OXYGEN SENSOR 2

Replace heated oxygen sensor 2.

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.

>> INSPECTION END

CHECK INTERMITTENT INCIDENT

Refer to

GI-39, "Intermittent Incident"

>> INSPECTION END

Component Inspection

INFOID:0000000001088483

INSPECTION START

Do you have CONSULT-III?

YES

>> GO TO 2.

>> GO TO 3.

CHECK HEATED OXYGEN SENSOR 2

With CONSULT-III

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

Start engine and warm it up to the normal operating temperature.

Turn ignition switch OFF and wait at least 10 seconds.

Start engine and keep the engine speed between 3,500 and 4,000 rpm for at least 1 minute under no load.

Let engine idle for 1 minute.

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

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