Nissan Pathfinder (2005 year). Instruction — part 198
DTC P1128 THROTTLE CONTROL MOTOR
EC-435
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2005 Pathfinder
Removal and Installation
UBS00KCO
ELECTRIC THROTTLE CONTROL ACTUATOR
Refer to
EM-16, "INTAKE MANIFOLD COLLECTOR"
.
EC-436
DTC P1146, P1166 HO2S2
2005 Pathfinder
DTC P1146, P1166 HO2S2
PFP:226A0
Component Description
UBS00KCP
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 air fuel ratio (A/F) sensor 1
are shifted, the air-fuel ratio is controlled to stoichiometric, by the sig-
nal 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.
CONSULT-II Reference Value in Data Monitor Mode
UBS00KCQ
Specification data are reference values.
On Board Diagnosis Logic
UBS00KCR
The heated oxygen sensor 2 has a much longer switching time
between rich and lean than the air fuel ratio (A/F) sensor 1. The oxy-
gen 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 minimum voltage of sensor is
sufficiently low during the various driving condition such as fuel-cut.
SEF327R
MONITOR ITEM
CONDITION
SPECIFICATION
HO2S2 (B1)
HO2S2 (B2)
●
Warm-up condition
●
After keeping engine speed
between 3,500 and 4,000 rpm for
1 minute and at idle for 1 minute
under no load.
Revving engine from idle to 3,000 rpm
quickly.
0 - 0.3V
←→
Approx. 0.6 -
1.0V
HO2S2 MNTR (B1)
HO2S2 MNTR (B2)
LEAN
←→
RICH
PBIB2376E
DTC No.
Trouble diagnosis name
DTC detecting condition
Possible cause
P1146
1146
(Bank 1)
Heated oxygen sensor
2 minimum voltage
monitoring
The minimum 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
P1166
1166
(Bank 2)
DTC P1146, P1166 HO2S2
EC-437
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2005 Pathfinder
DTC Confirmation Procedure
UBS00KCS
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
TESTING CONDITION:
For better results, perform DTC WORK SUPPORT at a temperature of 0 to 30
°
C (32 to 86
°
F).
1.
Turn ignition switch ON and select “DATA MONITOR” mode with
CONSULT-II.
2.
Start engine and warm it up to the normal operating tempera-
ture.
3.
Turn ignition switch OFF and wait at least 10 seconds.
4.
Start engine and keep the engine speed between 3,500 and
4,000 rpm for at least 1 minute under no load.
5.
Let engine idle for 1 minute.
6.
Make sure that “COOLAN TEMP/S” indicates more than 70
°
C
(158
°
F).
If not, warm up engine and go to next step when “COOLAN
TEMP/S” indication reaches to 70
°
C (158
°
F).
7.
Open engine hood.
8.
Select “HO2S2 (B1) P1146” or “HO2S2 (B2) P1166” of “HO2S2” in “DTC WORK SUPPORT” mode with
CONSULT-II.
9.
Start engine and following the instruction of CONSULT-II.
NOTE:
It will take at most 10 minutes until “COMPLETED” is displayed.
10. Make sure that “OK” is displayed after touching “SELF-DIAG RESULTS”.
If “NG” is displayed, refer to
EC-442, "Diagnostic Procedure"
.
If “CAN NOT BE DIAGNOSED” is displayed, perform the following.
a.
Turn ignition switch OFF and leave the vehicle in a cool place (soak the vehicle).
b.
Return to step 1.
Overall Function Check
UBS00KCT
Use this procedure to check the overall function of the heated oxygen sensor 2 circuit. During this check, a 1st
trip DTC might not be confirmed.
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.
Set voltmeter probes between ECM terminal 74 [HO2S2 (B1) signal] or 55 [HO2S2 (B2) signal] and
ground.
SEF174Y
PBIB2372E
EC-438
DTC P1146, P1166 HO2S2
2005 Pathfinder
6.
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 below 0.18V at least once during this
procedure.
If the voltage can be confirmed in step 6, step 7 is not nec-
essary.
7.
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.
The voltage should be below 0.18V at least once during this
procedure.
8.
If NG, go to
EC-442, "Diagnostic Procedure"
.
PBIB1607E
DTC P1146, P1166 HO2S2
EC-439
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Wiring Diagram
UBS00KCU
BANK 1
BBWA1736E
EC-440
DTC P1146, P1166 HO2S2
2005 Pathfinder
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.
TER-
MINAL
NO.
WIRE
COLOR
ITEM
CONDITION
DATA (DC Voltage)
74
W
Heated oxygen sensor 2
(bank 1)
[Engine is running]
●
Warm-up condition
●
Revving engine from idle to 3,000 rpm
quickly after the following conditions are met
–
After keeping the engine speed between
3,500 and 4,000 rpm for 1 minute and at idle
for 1 minute under no load
0 - Approximately 1.0V
78
GR
Sensor ground
(Heated oxygen sensor)
[Engine is running]
●
Warm-up condition
●
Idle speed
Approximately 0V
DTC P1146, P1166 HO2S2
EC-441
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2005 Pathfinder
BANK 2
BBWA1737E
EC-442
DTC P1146, P1166 HO2S2
2005 Pathfinder
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.
Diagnostic Procedure
UBS00KCV
1.
CHECK GROUND CONNECTIONS
1.
Turn ignition switch OFF.
2.
Loosen and retighten three ground screws on the body. Refer to
.
OK or NG
OK
>> GO TO 2.
NG
>> Repair or replace ground connections.
TER-
MINAL
NO.
WIRE
COLOR
ITEM
CONDITION
DATA (DC Voltage)
55
G
Heated oxygen sensor 2
(bank 2)
[Engine is running]
●
Warm-up condition
●
Revving engine from idle to 3,000 rpm
quickly after the following conditions are met
–
After keeping the engine speed between
3,500 and 4,000 rpm for 1 minute and at idle
for 1 minute under no load
0 - Approximately 1.0V
78
GR
Sensor ground
(Heated oxygen sensor)
[Engine is running]
●
Warm-up condition
●
Idle speed
Approximately 0V
BBIA0539E
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