Infiniti Q45 (FY33). Manual — part 177
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SEF055TA
SEF377U
SEC032C
SEF398UA
SEF135T
DIAGNOSTIC PROCEDURE
INSPECTION START
1. Turn ignition switch “OFF”.
2. Loosen and retighten engine ground screws.
CHECK INPUT SIGNAL CIRCUIT.
1. Disconnect heated oxygen sensor 2 (rear)
harness connector and ECM harness connec-
tor.
2. Check harness continuity between ECM and
sensor terminals.
Continuity should exist.
3. Check harness continuity between ECM sen-
sor or ground terminals.
Continuity should not exist.
If OK, check harness for short to ground and
short to power.
OK
E
NG
Check the following.
I
Harness connectors
F3
,
E12
(B1) or
F14
,
F131
(B2)
I
Harness connectors
E19
,
E102
(B1)
If NG, repair open circuit or
short to ground or short to
power in harness or connec-
tors.
CHECK GROUND CIRCUIT.
Check harness continuity between terminal
q
3
and engine ground.
Continuity should exist.
If OK, check harness for short to power.
OK
E
NG
Check the following.
I
Harness connectors
F3
,
E12
(B1) or
F14
,
F131
(B2)
I
Harness connectors
E19
,
E102
(B1)
I
Harness connectors
F62
,
F61
I
Harness for open or short
between heated oxygen sen-
sor 2 (rear) and engine
ground
If NG, repair open circuit or
short to power in harness or
connectors.
CHECK COMPONENT
[Heated oxygen sensor 2 (rear)].
1. Turn ignition switch “OFF”.
2. Disconnect sensor harness connector and
check for water.
Water should not exist.
If OK, go to step 3.
3. Check heated oxygen sensor 2 (rear).
Refer to “COMPONENT INSPECTION” on next
page.
OK
E
NG
Repair or replace harness
and/or connectors or replace
corresponding heated oxygen
sensor.
Perform “TROUBLE DIAGNOSIS FOR INTER-
MITTENT INCIDENT”, EC-117.
OK
INSPECTION END
DTC
Terminals
Bank
(Harness
protector
color)
ECM
Sensor
P0140
90
2
(B1) (White)
P0160
89
2
(B2) (Red)
DTC
Terminals
Bank
(Harness
protector
color)
ECM or
sensor
Ground
P0140
90 or 2
Ground
(B1) (White)
P0160
89 or 2
Ground
(B2) (Red)
GI
MA
EM
LC
FE
AT
PD
FA
RA
BR
ST
RS
BT
HA
EL
IDX
TROUBLE DIAGNOSIS FOR DTC P0140 (B1), P0160 (B2)
Heated Oxygen Sensor 2 (Rear) (P0140: Bank
1), (P0160: Bank 2) (High voltage) (Cont’d)
H
H
H
H
H
H
EC-237
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SEC033C
SEF354WA
COMPONENT INSPECTION
Heated oxygen sensor 2 (rear)
1) Start engine and drive vehicle at a speed of more than
70 km/h (43 MPH) for 2 consecutive minutes.
2) Stop vehicle with engine running.
3) Select “FUEL INJECTION” in “ACTIVE TEST” mode,
and select “HO2S2 (B1) (B2)” as the monitor item with
CONSULT-II.
4) Check “HO2S2 (B1) (B2)” at idle speed when adjusting
“FUEL INJECTION” to ±25%.
“HO2S2 (B1) (B2)” should be above 0.48V at least
once when the “FUEL INJECTION” is +25%.
“HO2S2 (B1) (B2)” should be below 0.43V at least
once when the “FUEL INJECTION” is −25%.
------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ OR ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
1) Start engine and drive vehicle at a speed of more than
70 km/h (43 MPH) for 2 consecutive minutes.
2) Stop vehicle with engine running.
3) Set voltmeter probes between ECM terminals
q
89
(B2),
q
90
(B1) (sensor signal) and ground.
4) Check the voltage when racing up to 4,000 rpm under
no load at least 10 times.
(depress and release accelerator pedal as soon as pos-
sible)
The voltage should be above 0.48V at least once.
If the voltage is above 0.48V at step 4, step 5 is not
necessary.
5) Keep vehicle at idling for 10 minutes, then check the
voltage. Or check the voltage when coasting from 80
km/h (50 MPH) in D position with “OD” OFF.
The voltage should be below 0.43V at least once.
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 sys-
tem threads using Oxygen Sensor Thread Cleaner tool
J-43897-18 or J-43897-12 and approved anti-seize lubri-
cant.
SEF244Y
TROUBLE DIAGNOSIS FOR DTC P0140 (B1), P0160 (B2)
Heated Oxygen Sensor 2 (Rear) (P0140: Bank
1), (P0160: Bank 2) (High voltage) (Cont’d)
EC-238
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Heated Oxygen Sensor 2 Heaters (Rear)
(P0141: Bank 1), (P0161: Bank 2)
SYSTEM DESCRIPTION
Camshaft position sensor
E
Engine speed
ECM
E
Heated
oxygen
sensor 2
heater
(rear)
Mass air flow sensor
E
Amount of intake air
The ECM performs ON/OFF control of the heated
oxygen sensor 2 heater (rear) corresponding to the
engine speed.
OPERATION
Engine speed rpm
Heated oxygen sensor 2
heater (rear)
Ignition switch “ON” (Engine
stopped)
OFF
At idle [after driving for 2 min-
utes at a speed of more than
70 km/h (43 MPH)]
ON
CONSULT-II REFERENCE VALUE IN DATA MONITOR MODE
Specification data are reference values.
MONITOR ITEM
CONDITION
SPECIFICATION
HO2S2 HTR (B1)
HO2S2 HTR (B2)
I
Engine speed: At idle [after driving for 2 minutes at a speed of more than 70
km/h (43 MPH)]
ON
I
Engine speed: Above 3,600 rpm
I
Ignition “ON” with engine stopped
OFF
ECM TERMINALS AND REFERENCE VALUE
Specification data are reference values, and are measured between each terminal and ground.
CAUTION:
Do not use ECM ground terminals when measuring voltage. Doing so may result in damage to the
ECM’s transistor. Use a ground other than ECM terminals such as the body ground.
TER-
MINAL
NO.
WIRE
COLOR
ITEM
CONDITION
DATA
(DC voltage)
18
19
Y/R
L
Heated oxygen sensor 2
heater (rear) (B1)
Heated oxygen sensor 2
heater (rear) (B2)
Engine is running.
At idle [after driving 2 minutes at 70 km/h (43
MPH) or more]
0 - 0.5V
Ignition switch “ON”
Engine stopped
Engine is running.
Engine speed is above 3,600 rpm.
BATTERY VOLTAGE
(11 - 14V)
GI
MA
EM
LC
FE
AT
PD
FA
RA
BR
ST
RS
BT
HA
EL
IDX
TROUBLE DIAGNOSIS FOR DTC P0141 (B1), P0161 (B2)
EC-239
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ON BOARD DIAGNOSIS LOGIC
Diagnostic Trouble
Code No.
Malfunction is detected when .
Check Items
(Possible Cause)
P0141
0902
(B1)
I
The current amperage in the heated oxygen sensor
2 heater (rear) circuit is out of the normal range.
[The improper voltage drop signal is sent to ECM
through the heated oxygen sensor 2 heater (rear).]
I
Harness or connectors
[The heated oxygen sensor 2 heater (rear) circuit is
open or shorted.]
I
Heated oxygen sensor 2 heater (rear)
P0161
1002
(B2)
SEF261Y
DIAGNOSTIC TROUBLE CODE CONFIRMATION
PROCEDURE
NOTE:
If “DIAGNOSTIC TROUBLE CODE CONFIRMATION PROCE-
DURE” has been previously conducted, always turn ignition
switch “OFF” and wait at least 5 seconds before conducting
the next test.
TESTING CONDITION:
Before performing the following procedure, confirm that bat-
tery voltage is more than 10.5V.
1) Turn ignition switch “ON” and select “DATA MONITOR”
mode with CONSULT-II.
2) Start engine and drive vehicle at a speed of more than
70 km/h (43 MPH) for 2 consecutive minutes.
3) If 1st trip DTC is detected, go to “DIAGNOSTIC
PROCEDURE”, EC-243.
------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ OR ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
1) Start engine and drive vehicle at a speed of more than
70 km/h (43 MPH) for 2 consecutive minutes.
2) Turn ignition switch “OFF” and wait at least 5 seconds.
3) Start engine and drive vehicle at a speed of more than
70 km/h (43 MPH) for 2 consecutive minutes.
4) Select “MODE 3” with GST.
5) If
DTC
is
detected,
go
to
“DIAGNOSTIC
PROCEDURE”, EC-243.
When using GST, “DIAGNOSTIC TROUBLE CODE CONFIRMA-
TION PROCEDURE” should be performed twice as much as
when using CONSULT-II because GST cannot display MODE 7
(1st trip DTC) concerning this diagnosis. Therefore, using
CONSULT-II is recommended.
TROUBLE DIAGNOSIS FOR DTC P0141 (B1), P0161 (B2)
Heated Oxygen Sensor 2 Heaters (Rear)
(P0141: Bank 1), (P0161: Bank 2) (Cont’d)
EC-240
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