Infiniti I30 (A33). Manual — part 222
Possible Cause
NHEC0433
I
Heated oxygen sensor 1 (front)
I
Heated oxygen sensor 1 heater (front)
I
Fuel pressure
I
Injectors
I
Intake air leaks
DTC Confirmation Procedure
NHEC0098
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:
I
Always perform at a temperature above −10°C (14°F).
I
Before performing following procedure, confirm that bat-
tery voltage is more than 11V at idle.
SEF649Y
SEF650Y
SEF651Y
WITH CONSULT-II
NHEC0098S01
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) P0131” or
“HO2S1 (B2) P0151” 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 3,600 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
continuously until “TESTING” changes to “COMPLETED”. (It
will take approximately 50 seconds or more.)
ENG SPEED
1,200 - 2,600 rpm
Vehicle speed
80 - 100 km/h (50 - 62 MPH)
B/FUEL SCHDL
3 - 9 msec
Selector lever
Suitable position
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
“Diagnostic
Procedure”, EC-204.
GI
MA
EM
LC
FE
AT
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
DTC P0131 (BANK 1), P0151 (BANK 2) HO2S1 (FRONT) (LEAN SHIFT
MONITORING)
Possible Cause
EC-203
SEF308XB
Overall Function Check
NHEC0099
Use this procedure to check the overall function of the heated oxy-
gen sensor 1 (front) circuit. During this check, a 1st trip DTC might
not be confirmed.
WITH GST
NHEC0099S01
1)
Start engine and warm it up to normal operating temperature.
2)
Set voltmeter probes between ECM terminal 63 [HO2S1 (B1)
signal] or 62 [HO2S1 (B2) signal] and engine 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-204.
Diagnostic Procedure
NHEC0100
1
RETIGHTEN GROUND SCREWS
1. Turn ignition switch “OFF”.
2. Loosen and retighten engine ground screws.
SEF255X
©
GO TO 2.
2
RETIGHTEN HEATED OXYGEN SENSOR 1 (FRONT)
Loosen and retighten corresponding heated oxygen sensor 1 (front).
Tightening torque:
40 - 60 N·m (4.1 - 6.2 kg-m, 30 - 44 ft-lb)
©
GO TO 3.
DTC P0131 (BANK 1), P0151 (BANK 2) HO2S1 (FRONT) (LEAN SHIFT
MONITORING)
Overall Function Check
EC-204
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 “START”.
SEF215Z
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 1st trip DTC P0100 is displayed.
6. Erase the 1st trip DTC memory. Refer to “HOW TO ERASE 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 or P0174 detected?
Is it difficult to start engine?
Yes or No
Yes
©
Perform trouble diagnosis for DTC P0171, P0174. Refer to EC-292.
No
©
GO TO 4.
GI
MA
EM
LC
FE
AT
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
DTC P0131 (BANK 1), P0151 (BANK 2) HO2S1 (FRONT) (LEAN SHIFT
MONITORING)
Diagnostic Procedure (Cont’d)
EC-205
4
CHECK HEATED OXYGEN SENSOR 1 HEATER (FRONT)
1. Stop engine.
2. Check heated oxygen sensor 1 (front) harness protector color.
SEC020C
3. Disconnect HO2S1 (front) harness connector.
4. Check resistance between HO2S1 (front) terminals as follows.
SEF310X
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.
OK or NG
OK (With CONSULT-II)
©
GO TO 5.
OK (Without CONSULT-
II)
©
GO TO 6.
NG
©
GO TO 7.
DTC P0131 (BANK 1), P0151 (BANK 2) HO2S1 (FRONT) (LEAN SHIFT
MONITORING)
Diagnostic Procedure (Cont’d)
EC-206
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