Infiniti M45 (Y34). Manual — part 445
DTC P1143, P1163 HO2S1
EC-469
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DTC Confirmation Procedure
ABS002OC
CAUTION:
Always drive vehicle at a safe speed.
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.
TESTING CONDITION:
●
Always perform at a temperature above
−
10
°
C (14
°
F).
●
Before performing following procedure, confirm that battery voltage is more than 11V at idle.
WITH CONSULT-II
1.
Start engine and warm it up to normal operating temperature.
2.
Stop engine and wait at least 10 seconds.
3.
Turn ignition switch ON and select “HO2S1 (B1) P1143” of “HO2S1” or “HO2S1 (B2) P1163” of “HO2S1”
in “DTC WORK SUPPORT” mode with CONSULT-II.
4.
Touch “START”.
5.
Start engine and let it idle for at least 3 minutes.
NOTE:
Never raise engine speed above 3,000 rpm after this step. If
the engine speed limit is exceeded, return to step 5.
6.
When the following conditions are met, “TESTING” will be dis-
played on the CONSULT-II screen. Maintain the conditions con-
tinuously until “TESTING” changes to “COMPLETED”. (It will
take approximately 40 seconds or more.)
If “TESTING” is not displayed after 5 minutes, retry from
step 2.
7.
Make sure that “OK” is displayed after touching “SELF-DIAG
RESULTS”. If “NG” is displayed, refer to
PBIB0546E
ENG SPEED
1,100 - 2,000 rpm
VHCL SPEED SE
Less than 100 km/h (62 MPH)
B/FUEL SCHDL
1.6 - 12.0 msec
Selector lever
Suitable position
PBIB0547E
SEC769C
EC-470
DTC P1143, P1163 HO2S1
Overall Function Check
ABS002OD
Use this procedure to check the overall function of the heated oxygen sensor 1 circuit. During this check, a 1st
trip DTC might not be confirmed.
WITH GST
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 one of the following with engine speed held at 2,000 rpm
constant under no load.
–
The maximum voltage is over 0.6V at least 1 time.
–
The minimum voltage is over 0.1V at least 1 time.
4.
If NG, go to
EC-470, "Diagnostic Procedure"
Diagnostic Procedure
ABS002OE
1.
CHECK GROUND CONNECTIONS
1.
Turn ignition switch OFF.
2.
Loosen and retighten two ground screws.
Refer to
OK or NG
OK
>> GO TO 2.
NG
>> Repair or replace ground connections.
2.
RETIGHTEN HEATED OXYGEN SENSOR 1
Loosen and retighten corresponding heated oxygen sensor 1.
>> GO TO 3.
PBIB0063E
PBIB1118E
Tightening torque: 40 - 50 N·m (4.1 - 5.1 kg-m, 30 - 37 ft-lb)
PBIB0016E
DTC P1143, P1163 HO2S1
EC-471
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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 P0171, P0174 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 P0171, P0174 detected?
Is it difficult to start engine?
Yes or No
Yes
>> Perform trouble diagnosis for DTC P0171, P0174. Refer to
No
>> GO TO 4.
4.
CHECK HEATED OXYGEN SENSOR 1 HEATER
Refer to
EC-164, "Component Inspection"
OK or NG
OK
>> GO TO 5.
NG
>> Replace malfunctioning heated oxygen sensor 1.
5.
CHECK HEATED OXYGEN SENSOR 1
Refer to
EC-472, "Component Inspection"
OK or NG
OK
>> GO TO 6.
NG
>> Replace malfunctioning heated oxygen sensor 1.
6.
CHECK INTERMITTENT INCIDENT
Refer to
EC-132, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT"
For circuit, refer to
>> INSPECTION END
SEF968Y
PBIB1119E
EC-472
DTC P1143, P1163 HO2S1
Component Inspection
ABS002OF
HEATED OXYGEN SENSOR 1
With CONSULT-II
1.
Start engine and warm it up to normal operating temperature.
2.
Select “MANU TRIG” and adjust “TRIGGER POINT” to 100% in
“DATA MONITOR” mode with CONSULT-II.
3.
Select “HO2S1 (B1)/(B2)” and “HO2S1 MNTR (B1)/(B2)”.
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.
PBIB1919E
SEF647Y
SEF648Y
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