Nissan Frontier D22. Instruction — part 276
DTC P0134 HO2S1
EC-207
[KA24DE]
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EC
3.
CHECK HEATED OXYGEN SENSOR 1
Refer to
EC-207, "Component Inspection"
With CONSULT-II
OK or NG
OK
>> GO TO 4.
NG
>> Replace heated oxygen sensor 1.
4.
CHECK INTERMITTENT INCIDENT
Perform
EC-120, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT"
>> INSPECTION END.
Component Inspection
UBS00D4H
HEATED OXYGEN SENSOR 1
With CONSULT-II
1.
Reconnect all harness connectors disconnected.
2.
Start engine and warm it up to normal operating temperature.
3.
Select “MANU TRIG” in “DATA MONITOR” mode, and the trigger point is adjusted to 100%.
4.
Select “HO2S1 (B1)” and “HO2S1 MNTR (B1)” in Item Selec-
tion.
5.
Hold engine speed at 2,000 rpm under no load during the follow-
ing steps.
6.
Touch “START” on CONSULT-II screen.
7.
Check the following.
–
“HO2S1 MNTR (B1)” in “DATA MONITOR” mode changes from
“RICH” to “LEAN” to “RICH” 5 times in 10 seconds.
5 times (cycles) are counted as shown below:
–
“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.
SEF646Y
SEF217YA
SEF648Y
EC-208
[KA24DE]
DTC P0134 HO2S1
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 J-43897-18 or J-43897-12 and approved anti-seize lubricant.
Without CONSULT-II
1.
Reconnect all harness connectors disconnected.
2.
Start engine and warm it up to normal operating temperature.
3.
Set voltmeter probes between ECM terminal 50 [Heated oxygen
sensor 1 signal] and engine ground.
4.
Check the following with engine speed held at 2,000 rpm con-
stant under no load.
–
The voltage fluctuates between 0 to 0.3V and 0.6 to 1.0V more
than 5 times within 10 seconds.
1 time: 0 - 0.3V
→ 0.6 - 1.0V → 0 - 0.3V
2 times: 0 - 0.3V
→ 0.6 - 1.0V → 0 - 0.3V → 0.6 - 1.0V → 0 -
0.3V
–
The maximum voltage is over 0.6V at least 1 time.
–
The minimum voltage is below 0.3V at least 1 time.
–
The 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 J-43897-18 or J-43897-12 and approved anti-seize lubricant.
Removal and Installation
UBS00D4I
HEATED OXYGEN SENSOR 1
EM-13, "OUTER COMPONENT PARTS"
AEC873A
DTC P0138 HO2S2
EC-209
[KA24DE]
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EC
DTC P0138 HO2S2
PFP:226A0
Component Description
UBS00D4J
The heated oxygen sensor 2, after three way catalyst (manifold),
monitors the oxygen level in the exhaust gas.
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.
CONSULT-II Reference Value in Data Monitor Mode
UBS00D4K
Specification data are reference values.
On Board Diagnosis Logic
UBS00D4L
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 before the three way catalyst (manifold) causes the
longer switching time. To judge the malfunctions of heated oxygen
sensor 2, ECM monitors whether or not the voltage is too high during
various driving conditions such as fuel-cut.
SEF327R
MONITOR ITEM
CONDITION
SPECIFICATION
HO2S2 (B1)
●
Engine: After warming up
●
Keeping the engine speed
between 3,500 and 4,000 rpm
for one minute and at idle for
one minute under no load
Revving engine from idle up to 3,000
rpm quickly.
0 - 0.3V
←→ Approx. 0.6 - 1.0V
HO2S2 MNTR (B1)
●
Engine: After warming up
●
Keeping the engine speed
between 3,500 and 4,000 rpm
for one minute and at idle for
one minute under no load
Revving engine from idle up to 3,000
rpm quickly.
LEAN
←→ RICH
PBIB1877E
DTC No.
Trouble diagnosis name
DTC detecting condition
Possible cause
P0138
Heated oxygen sensor
2 circuit high voltage
An excessively high voltage from the sensor is
sent to ECM.
●
Harness or connectors
(The sensor circuit is open or shorted)
●
Heated oxygen sensor 2
EC-210
[KA24DE]
DTC P0138 HO2S2
DTC Confirmation Procedure
UBS00D4M
NOTE:
If “DTC Confirmation Procedure ” has been previously conducted, always turn ignition switch OFF and wait at
least 5 seconds before conducting the next test.
WITH CONSULT-II
1.
Turn ignition switch “ON” and select “DATA MONITOR” mode with CONSULT-II.
2.
Start engine and warm it up to the normal operating temperature.
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 2 two minutes.
6.
If 1st trip DTC is detected, go to
EC-212, "Diagnostic Procedure"
.
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 2 minutes.
5.
Turn ignition switch OFF and wait at least 10 seconds.
6.
Start engine and keep the engine speed between 3,500 and 4,000 rpm for at least 1 minute under no load.
7.
Let engine idle for 2 minutes.
8.
Select “MODE 3” with GST.
9.
If NG, go to
EC-212, "Diagnostic Procedure"
.
●
When using GST, “DTC Confirmation Procedure” should be performed twice as much as when
using CONSULT-II because GST cannot display MODE 7 (1st trip DTC) concerning this diagnosis.
Therefore, using CONSULT-II is recommended.
SEF174Y
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