Infiniti M45 (Y34). Manual — part 447
DTC P1144, P1164 HO2S1
EC-477
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EC
3.
CLEAR THE SELF-LEARNING DATA
With CONSULT-II
1.
Start engine and warm it up to normal operating temperature.
2.
Select “SELF-LEARNING CONT” in “WORK SUPPORT” mode with CONSULT-II.
3.
Clear the self-learning control coefficient by touching “CLEAR”.
4.
Run engine for at least 10 minutes at idle speed.
Is the 1st trip DTC P0172, P0175 detected?
Is it difficult to start engine?
Without CONSULT-II
1.
Start engine and warm it up to normal operating temperature.
2.
Turn ignition switch OFF.
3.
Disconnect mass air flow sensor harness connector, and restart
and run engine for at least 5 seconds at idle speed.
4.
Stop engine and reconnect mass air flow sensor harness con-
nector.
5.
Make sure DTC P0102 is displayed.
6.
Erase the DTC memory. Refer to
EMISSION-RELATED DIAGNOSTIC INFORMATION"
.
7.
Make sure DTC P0000 is displayed.
8.
Run engine for at least 10 minutes at idle speed.
Is the 1st trip DTC P0172, P0175 detected?
Is it difficult to start engine?
Yes or No
Yes
>> Perform trouble diagnosis for DTC P0172, P0175. Refer to
No
>> GO TO 4.
SEF968Y
PBIB1119E
EC-478
DTC P1144, P1164 HO2S1
4.
CHECK HO2S1 CONNECTOR FOR WATER
1.
Turn ignition switch OFF.
2.
Disconnect heated oxygen sensor 1 harness connector.
3.
Check connectors for water.
OK or NG
OK
>> GO TO 5.
NG
>> Repair or replace harness or connectors.
5.
CHECK HEATED OXYGEN SENSOR 1 HEATER
Refer to
EC-164, "Component Inspection"
OK or NG
OK
>> GO TO 6.
NG
>> Replace malfunctioning heated oxygen sensor 1.
6.
CHECK HEATED OXYGEN SENSOR 1
Refer to
EC-478, "Component Inspection"
OK or NG
OK
>> GO TO 7.
NG
>> Replace malfunctioning heated oxygen sensor 1.
7.
CHECK INTERMITTENT INCIDENT
Refer to
EC-132, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT"
.
For circuit, refer to
.
>> INSPECTION END
Component Inspection
ABS002ON
HEATED OXYGEN SENSOR 1
With CONSULT-II
1.
Start engine and warm it up to normal operating temperature.
Water should not exist.
PBIB0017E
DTC P1144, P1164 HO2S1
EC-479
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2.
Select “MANU TRIG” and adjust “TRIGGER POINT” 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 follow-
ing steps.
5.
Touch “RECORD” on CONSULT-II screen.
6.
Check the following.
●
“HO2S1 MNTR (B1)/(B2)” 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 at right.
●
“HO2S1 (B1)/(B2)” voltage goes above 0.6V at least once.
●
“HO2S1 (B1)/(B2)” voltage goes below 0.3V at least once.
●
“HO2S1 (B1)/(B2)” 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.
Without CONSULT-II
1.
Start engine and warm it up to normal operating temperature.
2.
Set voltmeter probes between ECM terminal 114 [HO2S1 (B1) signal] or 115 [HO2S1 (B2) signal] and
ground.
3.
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.
●
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.
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
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.
PBIB2025E
SEF647Y
SEF648Y
PBIB0063E
EC-480
DTC P1144, P1164 HO2S1
●
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
ABS002OO
HEATED OXYGEN SENSOR 1
Refer to
EM-22, "EXHAUST MANIFOLD AND THREE WAY CATALYST"
.
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