Infiniti Q45 (FY33). Manual — part 178
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BANK 1
TEC789
GI
MA
EM
LC
FE
AT
PD
FA
RA
BR
ST
RS
BT
HA
EL
IDX
TROUBLE DIAGNOSIS FOR DTC P0141 (B1), P0161 (B2)
Heated Oxygen Sensor 2 Heaters (Rear)
(P0141: Bank 1), (P0161: Bank 2) (Cont’d)
EC-241
![](/vehicles/zatt/fitanyou/tushi/erfy.png)
BANK 2
TEC790
TROUBLE DIAGNOSIS FOR DTC P0141 (B1), P0161 (B2)
Heated Oxygen Sensor 2 Heaters (Rear)
(P0141: Bank 1), (P0161: Bank 2) (Cont’d)
EC-242
![](/vehicles/zatt/fitanyou/tushi/ror.png)
SEF055TA
SEF130T
SEF801WA
SEC032C
DIAGNOSTIC PROCEDURE
INSPECTION START
CHECK POWER SUPPLY.
1. Turn ignition switch “OFF”.
2. Disconnect heated oxygen sensor 2
(rear) harness connector.
3. Turn ignition switch “ON”.
4. Check voltage between terminal
q
4
and
ground.
Voltage: Battery voltage
OK
E
NG
Check the following.
I
Harness connectors
E102
,
E19
(B1) or
F14
,
F131
(B2)
I
Harness connectors
E14
,
F1
(B1)
I
Harness connectors
F63
,
M49
I
7.5A fuse
I
Harness for open or short
between heated oxygen
sensor 2 (rear) and fuse
If NG, repair harness or
connectors.
CHECK GROUND CIRCUIT.
1. Turn ignition switch “OFF”.
2. Disconnect ECM harness connector.
3. Check harness continuity between termi-
nal
q
1
and ECM terminals
q
19
(B1),
q
18
(B2).
Continuity should 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)
I
Harness connectors
F62
,
F61
I
Harness for open or short
between sensor and
ECM.
If NG, repair open circuit or
short to ground or short to
power in harness or con-
nectors.
CHECK COMPONENT
[Heated oxygen sensor 2 heater (rear)].
Refer to “COMPONENT INSPECTION” on
next page.
OK
E
NG
REPLACE HO2S2 (rear).
1. Check HO2S2 (rear) har-
ness protector color.
White: Left bank (B1)
Red: Right bank (B2)
2. Replace malfunctioning
HO2S2 (rear).
Perform “TROUBLE DIAGNOSIS FOR
INTERMITTENT INCIDENT”, EC-117.
INSPECTION END
GI
MA
EM
LC
FE
AT
PD
FA
RA
BR
ST
RS
BT
HA
EL
IDX
TROUBLE DIAGNOSIS FOR DTC P0141 (B1), P0161 (B2)
Heated Oxygen Sensor 2 Heaters (Rear)
(P0141: Bank 1), (P0161: Bank 2) (Cont’d)
H
H
H
H
H
EC-243
![](/vehicles/zatt/fitanyou/tushi/youndeth.png)
SEF132T
COMPONENT INSPECTION
Heated oxygen sensor 2 heater (rear)
Check the following.
1.
Check resistance between terminals
q
4
and
q
1
.
Resistance: 2.3 - 4.3
Ω
at 25°C (77°F)
2.
Check continuity.
Terminal No.
Continuity
q
2
and
q
1
,
q
3
,
q
4
No
q
3
and
q
1
,
q
2
,
q
4
If NG, replace the heated oxygen sensor 2 (rear).
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.
TROUBLE DIAGNOSIS FOR DTC P0141 (B1), P0161 (B2)
Heated Oxygen Sensor 2 Heaters (Rear)
(P0141: Bank 1), (P0161: Bank 2) (Cont’d)
EC-244
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