Infiniti QX4 (R50). Manual — part 188
TERMI-
NAL
NO.
WIRE
COLOR
ITEM
CONDITION
DATA (DC Voltage)
62
G/B
Heated oxygen sensor
1 (front) (bank 2)
[Engine is running]
I
Warm-up condition
I
Engine speed is 2,000 rpm.
0 - Approximately 1.0V (Peri-
odically change)
SEF059V
SEF010V
On Board Diagnosis Logic
NBEC0111
To judge the malfunction of heated oxygen sensor 1 (front), this
diagnosis measures response time of heated oxygen sensor 1
(front) signal. The time is compensated by engine operating (speed
and load), fuel feedback control constant, and heated oxygen sen-
sor 1 (front) temperature index. Judgment is based on whether the
compensated time [heated oxygen sensor 1 (front) cycling time
index] is inordinately long or not.
Malfunction is detected when the response of the voltage signal
from the sensor takes more than the specified time.
Possible Cause
NBEC0435
I
Harness or connectors
(The sensor circuit is open or shorted.)
I
Heated oxygen sensor 1 (front)
I
Heated oxygen sensor 1 heater (front)
I
Fuel pressure
I
Injectors
I
Intake air leaks
I
Exhaust gas leaks
I
PCV valve
I
Mass air flow sensor
GI
MA
EM
LC
FE
AT
TF
PD
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
DTC P0133, P0153 HEATED OXYGEN SENSOR 1 (FRONT) (BANK 1)/(BANK 2)
(RESPONSE MONITORING)
ECM Terminals and Reference Value (Cont’d)
EC-219
DTC Confirmation Procedure
NBEC0112
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 the following procedure, confirm that
battery voltage is more than 11V at idle.
SEF338Z
SEF339Z
SEF658Y
WITH CONSULT-II
NBEC0112S01
1)
Start engine and warm it up to normal operating temperature.
2)
Stop engine and wait at least 5 seconds.
3)
Turn ignition switch “ON” and select “HO2S1 (B1)/(B2) P0133/
P0153” 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 40 to 50 seconds.)
ENG SPEED
1,600 - 3,100 rpm
Vehicle speed
80 - 120 km/h (50 - 75 MPH)
B/FUEL SCHDL
5 - 12 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-224.
DTC P0133, P0153 HEATED OXYGEN SENSOR 1 (FRONT) (BANK 1)/(BANK 2)
(RESPONSE MONITORING)
DTC Confirmation Procedure
EC-220
SEF308XB
Overall Function Check
NBEC0113
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
NBEC0113S01
1)
Start engine and warm it up to normal operating temperature.
2)
Set voltmeter probes between ECM terminal 63 (HO2S1 bank
1 right signal) or 62 (HO2S1 bank 2 left signal) and engine
ground.
3)
Check the following with engine speed held at 2,000 rpm con-
stant under no load.
I
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
4)
If NG, go to “Diagnostic Procedure”, EC-224.
GI
MA
EM
LC
FE
AT
TF
PD
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
DTC P0133, P0153 HEATED OXYGEN SENSOR 1 (FRONT) (BANK 1)/(BANK 2)
(RESPONSE MONITORING)
Overall Function Check
EC-221
Wiring Diagram
NBEC0114
RIGHT BANK
NBEC0114S01
MEC947C
DTC P0133, P0153 HEATED OXYGEN SENSOR 1 (FRONT) (BANK 1)/(BANK 2)
(RESPONSE MONITORING)
Wiring Diagram
EC-222
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