Nissan Qashqai (2007-2010). Manual — part 333
P1146 HO2S2
EC-851
< COMPONENT DIAGNOSIS >
[MR20DE (WITH EURO-OBD)]
C
D
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EC
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P1146 HO2S2
Description
INFOID:0000000001089433
The heated oxygen sensor 2, after three way catalyst (manifold),
monitors the oxygen level in the exhaust gas on each bank.
Even if switching characteristics of the heated oxygen sensor 1 are
shifted, the air-fuel ratio is controlled to stoichiometric, by the signal
from the heated oxygen sensor 2.
This sensor is made of ceramic zirconia. The zirconia generates volt-
age from approximately 1V in richer conditions to 0V in leaner condi-
tions.
Under normal conditions the heated oxygen sensor 2 is not used for
engine control operation.
DTC Logic
INFOID:0000000001089434
DTC DETECTION LOGIC
The heated oxygen sensor 2 has a much longer switching time
between rich and lean than the heated oxygen sensor 1. The oxygen
storage capacity of the three way catalyst (manifold) causes the
longer switching time. To judge the malfunctions of heated oxygen
sensor 2, ECM monitors whether the maximum voltage of the sensor
is sufficiently high during the various driving condition such as fuel-
cut.
DTC CONFIRMATION PROCEDURE
1.
INSPECTION START
Do you have CONSULT-III?
Do you have CONSULT-III?
YES
>> GO TO 2.
NO
>> GO TO 11.
2.
PRECONDITIONING
“COMPLETED” will appear on CONSULT-III screen when all tests “COND1”, “COND2” and “COND3” are
completed.
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:
• For the best results, perform
″
DTC WORK SUPPORT
″
at a temperature of 0 to 30
°
C (32 to 86
°
F).
• Never stop engine during this procedure. If the engine is stopped, retry this procedure from step 2 in
Procedure for COND1.
CAUTION:
Always drive at safe speed.
SEF327R
SEF259VA
DTC No.
Trouble diagnosis name
DTC detecting condition
Possible cause
P1146
Heated oxygen sensor 2
circuit low voltage
The maximum voltage from the sensor is not
reached to the specified voltage.
• Harness or connectors
(The sensor circuit is open or shorted)
• Heated oxygen sensor 2
• Fuel pressure
• Fuel injector
• Intake air leaks
EC-852
< COMPONENT DIAGNOSIS >
[MR20DE (WITH EURO-OBD)]
P1146 HO2S2
>> GO TO 3.
3.
PERFORM PROCEDURE FOR COND1-I
Start engine and warm it up to normal operating temperature.
>> GO TO 4.
4.
PERFORM PROCEDURE FOR COND1-II
Turn ignition switch OFF and wait at least 10 seconds.
>> GO TO 5.
5.
PERFORM PROCEDURE FOR COND1-IV
1.
Start engine and keep the engine speed between 3,500 and 4,000 rpm for at least 1 minute under no load.
2.
Let engine idle 1 minute.
3.
Select “HO2S2 (B1) P1146” of “HO2S2” in “DTC WORK SUPPORT” mode with CONSULT-III.
4.
Touch “START”.
5.
Start engine and let it idle for at least 30 seconds.
6.
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 9.
NO
>> GO TO 6.
6.
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.
7.
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.
8.
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.
9.
PERFORM PROCEDURE FOR COND3-I
Touch “SELF DIAGRESULTS”.
Which displayed on CONSULT-III screen?
OK
>> INSPECTION END
NG >> Go
ENG SPEED
More than 1,000 rpm
B/FUEL SCHDL
More than 1.0 msec
COOLAN TEMP/S
More than 70
°
C (158
°
F)
Shift level
Suitable position
P1146 HO2S2
EC-853
< COMPONENT DIAGNOSIS >
[MR20DE (WITH EURO-OBD)]
C
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F
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EC
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CAN NOT BE DIAGNOSED>>GO TO 10.
10.
PERFORM PROCEDURE FOR COND3-II
1.
Turn ignition switch OFF and leave the vehicle in a cool place (soak the vehicle).
2.
Turn ignition switch ON and select “COOLAN TEMP/S” in “DATA MONITOR” mode with CONSULT-III.
3.
Start engine and warm it up while monitoring “COOLAN TEMP/S” indication on CONSULT-III.
4.
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-856, "Component Function Check"
.
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
NO
>> Go to
Component Function Check
INFOID:0000000001089435
1.
PERFORM COMPONENT FUNCTION CHECK-I
With GST
1.
Start engine and warm it up to the normal operating temperature.
2.
Turn ignition switch OFF and wait at least 10 seconds.
3.
Start engine and keep the engine speed between 3,500 and 4,000 rpm for at least 1 minute under no load.
4.
Let engine idle for 1 minute.
5.
Check the voltage between ECM harness connector and ground under the following condition.
Is the inspection result normal?
YES
>> INSPECTION END
NO
>> GO TO 2.
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
NO
>> GO TO 3.
3.
PERFORM COMPONENT FUNCTION CHECK-III
Check the voltage between ECM harness connector and ground under the following condition.
ECM
Ground
Condition
Voltage
Connector
Terminal
F8
50
(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
F8
50
(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
F8
50
(HO2S2 signal)
Ground
Coasting from 80 km/h (50 MPH) in D position
(CVT), 4th gear position (M/T)
The voltage should be above 0.68V at least
once during this procedure.
EC-854
< COMPONENT DIAGNOSIS >
[MR20DE (WITH EURO-OBD)]
P1146 HO2S2
Is the inspection result normal?
YES
>> INSPECTION END
NO
>> Go to
Diagnosis Procedure
INFOID:0000000001089436
1.
CHECK GROUND CONNECTION
1.
Turn ignition switch OFF.
2.
Check ground connection E21. Refer to Ground Inspection in
.
Is the inspection result normal?
YES
>> GO TO 2.
NO
>> Repair or replace ground connection.
2.
CLEAR THE SELF-LEARNING DATA
1.
Clear mixture ratio self-learning value, refer to
EC-649, "MIXTURE RATIO SELF-LEARNING VALUE
CLEAR : Special Repair Requirement"
.
2.
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
.
NO
>> GO TO 3.
3.
CHECK HO2S2 GROUND CIRCUIT FOR OPEN AND SHORT
1.
Turn ignition switch OFF.
2.
Disconnect heated oxygen sensor 2 harness connector.
3.
Disconnect ECM harness connector.
4.
Check the continuity between HO2S2 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 5.
NO
>> GO TO 4.
4.
DETECT MALFUNCTIONING PART
Check the following.
• Harness connectors E7, F121
• Harness for open or short between heated oxygen sensor 2 and ECM.
>> Repair open circuit or short to ground or short to power in harness or connectors.
5.
CHECK HO2S2 INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1.
Check the continuity between HO2S2 harness connector and ECM harness connector.
2.
Check the continuity between HO2S2 harness connector or ECM harness connector and ground.
3.
Also check harness for short to power.
HO2S2
ECM
Continuity
Connector
Terminal
Connector
Terminal
E58
1
F8
59
Existed
HO2S2
ECM
Continuity
Connector
Terminal
Connector
Terminal
E58
4
F8
50
Existed
HO2S2
ECM
Ground
Continuity
Connector
Terminal
Connector
Terminal
E58
4
F8
50
Ground
Not existed
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