Infiniti QX4 (R50). Manual — part 193
6
CHECK HEATED OXYGEN SENSOR 1 (FRONT)
Without CONSULT-II
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 constant under no load.
SEF967XA
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
©
GO TO 8.
NG
©
GO TO 7.
7
REPLACE HEATED OXYGEN SENSOR 1 (FRONT)
1. Turn ignition switch “OFF”.
2. Check heated oxygen sensor 1 (front) harness protector color.
SEF505Y
CAUTION:
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.
©
Replace malfunctioning heated oxygen sensor 1 (front).
8
CHECK INTERMITTENT INCIDENT
Refer to “TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT”, EC-140.
©
INSPECTION END
GI
MA
EM
LC
FE
AT
TF
PD
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
DTC P0134, P0154 HEATED OXYGEN SENSOR 1 (FRONT) (BANK 1)/(BANK 2)
(HIGH VOLTAGE)
Diagnostic Procedure (Cont’d)
EC-239
Description
NBEC0123
SYSTEM DESCRIPTION
NBEC0123S01
Sensor
Input Signal to ECM
ECM func-
tion
Actuator
Crankshaft position sensor (POS)
Engine speed
Heated
oxygen
sensor 1
heater
(front) con-
trol
Heated oxygen sensor 1 heat-
ers (front)
Crankshaft position sensor (REF)
The ECM performs ON/OFF control of the heated oxygen sensor 1 heaters (front) corresponding to the engine
speed.
OPERATION
NBEC0123S02
Engine speed
rpm
Heated oxygen sensor 1 heaters (front)
Above 3,600
OFF
Below 3,600
ON
CONSULT-II Reference Value in Data Monitor
Mode
NBEC0124
Specification data are reference values.
MONITOR ITEM
CONDITION
SPECIFICATION
HO2S1 HTR (B1)
HO2S1 HTR (B2)
I
Engine speed: Below 3,600 rpm
ON
I
Engine speed: Above 3,600 rpm
OFF
ECM Terminals and Reference Value
NBEC0657
Specification data are reference values and are measured between each terminal and ground.
CAUTION:
Do not use ECM ground terminals when measuring input/output voltage. Doing so may result in dam-
age to the ECM’s transistor. Use a ground other than ECM terminals, such as the ground.
TERMI-
NAL
NO.
WIRE
COLOR
ITEM
CONDITION
DATA (DC Voltage)
3
L/OR
Heated oxygen sensor
1 heater (front) (bank
1)
[Engine is running]
I
Engine speed is below 3,600 rpm.
0 - 1.0V
[Engine is running]
I
Engine speed is above 3,600 rpm.
BATTERY VOLTAGE
(11 - 14V)
2
R/G
Heated oxygen sensor
1 heater (front) (bank
2)
[Engine is running]
I
Engine speed is below 3,600 rpm.
0 - 1.0V
[Engine is running]
I
Engine speed is above 3,600 rpm.
BATTERY VOLTAGE
(11 - 14V)
DTC P0135, P0155 HEATED OXYGEN SENSOR 1 HEATER (FRONT) (BANK
1)/(BANK 2)
Description
EC-240
On Board Diagnosis Logic
NBEC0126
Malfunction is detected when the current amperage in the heated
oxygen sensor 1 heater (front) circuit is out of the normal range.
[An improper voltage drop signal is sent to ECM through the heated
oxygen sensor 1 heater (front).]
Possible Cause
NBEC0437
I
Harness or connectors
(The heated oxygen sensor 1 heater (front) circuit is open or
shorted.)
I
Heated oxygen sensor 1 heater (front)
SEF058Y
DTC Confirmation Procedure
NBEC0127
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:
Before performing the following procedure, confirm that bat-
tery voltage is between 10.5V and 16V at idle.
WITH CONSULT-II
NBEC0127S01
1)
Turn ignition switch “ON” and select “DATA MONITOR” mode
with CONSULT.
2)
Start engine and run it for at least 6 seconds at idle speed.
3)
If 1st trip DTC is detected, go to “Diagnostic Procedure”,
EC-244.
WITH GST
NBEC0127S02
1)
Start engine and run it for at least 6 seconds at idle speed.
2)
Turn ignition switch “OFF” and wait at least 10 seconds.
3)
Start engine and run it for at least 6 seconds at idle speed.
4)
Select “MODE 3” with GST.
5)
If DTC is detected, go to “Diagnostic Procedure”, EC-244.
I
When using GST, “DTC Confirmation Procedure” should
be performed twice as much as when using CONSULT-II
because GST cannot display MODE 7 (1st trip DTC) con-
cerning this diagnosis. Therefore, using CONSULT-II is
recommended.
GI
MA
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LC
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AT
TF
PD
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
DTC P0135, P0155 HEATED OXYGEN SENSOR 1 HEATER (FRONT) (BANK
1)/(BANK 2)
On Board Diagnosis Logic
EC-241
Wiring Diagram
NBEC0128
RIGHT BANK
NBEC0128S01
MEC949C
DTC P0135, P0155 HEATED OXYGEN SENSOR 1 HEATER (FRONT) (BANK
1)/(BANK 2)
Wiring Diagram
EC-242
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