Infiniti Q45 (FY33). Manual — part 168
SEF390UA
q
A
CHECK COMPONENT
[Heated oxygen sensor 1 (front)].
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 1 (front).
Refer to “COMPONENT INSPECTION” on
next page.
OK
E
NG
REPAIR OR REPLACE
HO2S1 (front).
Repair or replace harness
and/or connectors as fol-
lows.
1. Check HO2S1 (front)
harness protector color.
Black: Left bank (B1)
Blue: Right bank (B2)
2. Repair or replace mal-
functioning HO2S1
(front).
Perform “TROUBLE DIAGNOSIS FOR
INTERMITTENT INCIDENT”, EC-117.
OK
INSPECTION END
GI
MA
EM
LC
FE
AT
PD
FA
RA
BR
ST
RS
BT
HA
EL
IDX
TROUBLE DIAGNOSIS FOR DTC P0134 (B1), P0154 (B2)
Heated Oxygen Sensor 1 (Front) (P0134: Bank
1), (P0154: Bank 2) (Cont’d)
H
H
H
EC-201
SEF977Z
COMPONENT INSPECTION
Heated oxygen sensor 1 (front)
1) Start engine and warm it up to normal operating tem-
perature.
2) Select “MANU TRIG” and “HI SPEED” in “DATA MONI-
TOR” mode with CONSULT-II, and select “HO2S1 (B1)
(B2)” and “HO2S1 MNTR (B1) (B2)”.
3) Hold engine speed at 2,000 rpm under no load during
the following steps.
4) Touch “RECORD” on CONSULT-II screen.
5) Check the following.
I
“HO2S1 MNTR (B1) (B2)” in “DATA MONITOR” mode
changes from “RICH” to “LEAN” to “RICH” 5 times in 10
seconds.
5 times (cycles) are counted as shown below:
cycle
1
2
3
4
5
HO2S1 MNTR (B1) R-L-R-L-R-L-R-L-R-L-R
R = “HO2S1 MNTR (B1) (B2)”, “RICH”
L = “HO2S1 MNTR (B1) (B2)”, “LEAN”
I
“HO2S1 (B1) (B2)” voltage goes above 0.6V at least
once.
I
“HO2S1 (B1) (B2)” voltage goes below 0.30V at least
once.
I
The voltage never exceeds 1.0V.
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.
SEF978Z
SEF353WA
------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ OR ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
1) Start engine and warm it up to normal operating tem-
perature.
2) Set voltmeter probes between ECM terminal
q
82
(B2),
q
83
(B1) (sensor signal) and ground.
3) Check the following with engine speed held at 2,000
rpm constant under no load.
I
Malfunction indicator lamp goes on more than 5 times
within 10 seconds in Diagnostic Test Mode II [HEATED
OXYGEN SENSOR 1 MONITOR (FRONT)]. See
EC-68.
I
The maximum voltage is over 0.6V at least one time.
I
The minimum voltage is below 0.30V at least one time.
TROUBLE DIAGNOSIS FOR DTC P0134 (B1), P0154 (B2)
Heated Oxygen Sensor 1 (Front) (P0134: Bank
1), (P0154: Bank 2) (Cont’d)
EC-202
I
The voltage never exceeds 1.0V.
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.
GI
MA
EM
LC
FE
AT
PD
FA
RA
BR
ST
RS
BT
HA
EL
IDX
TROUBLE DIAGNOSIS FOR DTC P0134 (B1), P0154 (B2)
Heated Oxygen Sensor 1 (Front) (P0134: Bank
1), (P0154: Bank 2) (Cont’d)
EC-203
Heated Oxygen Sensor 1 Heater (Front) (P0135:
Bank 1), (P0155: Bank 2)
SYSTEM DESCRIPTION
Camshaft position sensor
E
Engine speed
ECM
E
Heated
oxygen
sensor 1
heater
(front)
Mass air flow sensor
E
Amount of intake air
The ECM performs ON/OFF control of the heated
oxygen sensor 1 heater (front) corresponding to the
engine speed.
OPERATION
Engine speed rpm
Heated oxygen sensor 1
heater (front)
Above 3,200
OFF
Below 3,200
ON
CONSULT-II REFERENCE VALUE IN DATA MONITOR MODE
Specification data are reference values.
MONITOR ITEM
CONDITION
SPECIFICATION
HO2S1 HTR (B1)
HO2S1 HTR (B2)
I
Engine speed: Idle
ON
I
Engine speed: Above 3,200
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)
17
(B1)
G/W
Heated oxygen sensor 1
heater (front)
Engine is running.
Engine speed is below 3,200 rpm.
0 - 0.5V
16
(B2)
L/Y
Engine is running.
Engine speed is above 3,200 rpm.
BATTERY VOLTAGE
(11 - 14V)
ON BOARD DIAGNOSIS LOGIC
Diagnostic Trouble
Code No.
Malfunction is detected when .
Check Items
(Possible Cause)
P0135
0901
(Bank 1)
I
The current amperage in the heated oxygen sensor
1 heater (front) circuit is out of the normal range.
[The improper voltage drop signal is sent to ECM
through the heated oxygen sensor 1 heater (front).]
I
Harness or connectors
(The heated oxygen sensor 1 heater (front) circuit is
open or shorted.)
I
Heated oxygen sensor 1 heater (front)
P0155
1001
(Bank 2)
TROUBLE DIAGNOSIS FOR DTC P0135 (B1), P0155 (B2)
EC-204
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