Infiniti I35 (A33). Manual — part 285
SEC902C
Overall Function Check
NHEC1152
Use this procedure to check the overall function of the heated oxy-
gen sensor 1 circuit. During this check, a 1st trip DTC might not be
confirmed.
WITH GST
NHEC1152S01
1)
Start engine and warm it up to normal operating temperature.
2)
Set voltmeter probes between ECM terminal 91 (bank 1
HO2S1 signal) or 92 (bank 2 HO2S1 signal) and ground.
3)
Check one of the following with engine speed held at 2,000
rpm constant under no load.
I
The maximum voltage is over 0.6V at least one time.
I
The minimum voltage is over 0.1V at least one time.
4)
If NG, go to “Diagnostic Procedure”, EC-481.
Diagnostic Procedure
NHEC1153
1
CHECK GROUND CONNECTIONS
1. Turn ignition switch OFF.
2. Loosen and retighten two engine ground screws.
Refer to “Ground Inspection”, EC-160.
SEC047D
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.
Tightening torque:
40 - 60 N·m (4.1 - 6.1 kg-m, 30 - 44 ft-lb)
©
GO TO 3.
GI
MA
EM
LC
FE
AT
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
DTC P1143, P1163 HO2S1
Overall Function Check
EC-481
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”.
SEF968Y
4. Run engine for at least 10 minutes at idle speed.
Is the 1st trip DTC P0171 or 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 connector.
5. Make sure DTC P0102 is displayed.
6. Erase the DTC memory. Refer to “HOW TO ERASE EMISSION-RELATED DIAGNOSTIC INFORMATION”, EC-88.
7. Make sure DTC P0000 is displayed.
8. Run engine for at least 10 minutes at idle speed.
Is the 1st trip DTC P0171 or P0174 detected?
Is it difficult to start engine?
Yes or No
Yes
©
Perform trouble diagnosis for DTC P0171, P0174. Refer to EC-273.
No
©
GO TO 4.
DTC P1143, P1163 HO2S1
Diagnostic Procedure (Cont’d)
EC-482
4
CHECK HEATED OXYGEN SENSOR 1 HEATER
1. Stop engine.
2. Disconnect HO2S1 harness connector.
3. Check resistance between HO2S1 terminals as follows.
SEF310XB
CAUTION:
I
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.
I
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.
OK or NG
OK (With CONSULT-II)
©
GO TO 5.
OK (Without CONSULT-
II)
©
GO TO 6.
NG
©
Replace malfunctioning heated oxygen sensor 1.
GI
MA
EM
LC
FE
AT
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
DTC P1143, P1163 HO2S1
Diagnostic Procedure (Cont’d)
EC-483
5
CHECK 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 following steps.
5. Touch “RECORD” on CONSULT-II screen.
SEF967Y
6. Check the following.
I
“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 below.
SEF647Y
I
“HO2S1 (B1)/(B2)” voltage goes above 0.6V at least once.
I
“HO2S1 (B1)/(B2)” voltage goes below 0.3V at least once.
I
“HO2S1 (B1)/(B2)” voltage never exceeds 1.0V.
SEF648Y
CAUTION:
I
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.
I
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.
OK or NG
OK
©
GO TO 7.
NG
©
Replace malfunctioning heated oxygen sensor 1.
DTC P1143, P1163 HO2S1
Diagnostic Procedure (Cont’d)
EC-484
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