Infiniti Q45 (FY33). Manual — part 173
![](/vehicles/zatt/fitanyou/tushi/zailindro.png)
BANK 1
TEC787
GI
MA
EM
LC
FE
AT
PD
FA
RA
BR
ST
RS
BT
HA
EL
IDX
TROUBLE DIAGNOSIS FOR DTC P0138 (B1), P0158 (B2)
Heated Oxygen Sensor 2 (Rear) (P0138: Bank
1), (P0158: Bank 2) (Max. Voltage Monitoring)
(Cont’d)
EC-221
![](/vehicles/zatt/fitanyou/tushi/goung.png)
BANK 2
TEC788
TROUBLE DIAGNOSIS FOR DTC P0138 (B1), P0158 (B2)
Heated Oxygen Sensor 2 (Rear) (P0138: Bank
1), (P0158: Bank 2) (Max. Voltage Monitoring)
(Cont’d)
EC-222
![](/vehicles/zatt/fitanyou/tushi/bloou.png)
SEF055TA
SEF377U
SEF985Z
SEF395W
DIAGNOSTIC PROCEDURE
INSPECTION START
1. Turn ignition switch “OFF”.
2. Loosen and retighten engine ground
screws.
CLEAR THE SELF-LEARNING DATA
1. Start engine and warm it up to normal
operating temperature.
2. Select “SELF-LEARNING
CONT” in “WORK SUPPORT”
mode with CONSULT-II.
3. Clear the self-learning control
coefficient by touching “CLEAR”.
4. Run engine for at least 10 min-
utes at idle speed.
Are the 1st trip DTCs P0171,
P0174 detected? Is it difficult
to start engine?
-------------------------------------------------------------------------------------------------------------------------------------- OR --------------------------------------------------------------------------------------------------------------------------------------
2. Turn ignition switch “OFF”.
3. Disconnect mass air flow sensor
harness connector, and restart
and run engine for at least 3
seconds at idle speed.
4. Stop engine and reconnect
mass air flow sensor harness
connector.
5. Make sure diagnostic trouble
code No. 0102 is displayed in
Diagnostic Test Mode II.
6. Erase the diagnostic test mode
II (Self-diagnostic results)
memory. Make sure diagnostic
trouble code No. 0505 is dis-
played in Diagnostic Test Mode
II.
7. Run engine for at least 10 min-
utes at idle speed.
Are the 1st trip DTCs 0115,
0210 detected? Is it difficult to
start engine?
No
E
Yes
Go to “TROUBLE DIAG-
NOSIS FOR DTC P0171,
P0174”, EC-245.
q
A
(Go to next page.)
GI
MA
EM
LC
FE
AT
PD
FA
RA
BR
ST
RS
BT
HA
EL
IDX
TROUBLE DIAGNOSIS FOR DTC P0138 (B1), P0158 (B2)
Heated Oxygen Sensor 2 (Rear) (P0138: Bank
1), (P0158: Bank 2) (Max. Voltage Monitoring)
(Cont’d)
H
H
H
EC-223
![](/vehicles/zatt/fitanyou/tushi/ono.png)
SEC032C
SEF392UA
SEF129T
q
A
CHECK INPUT SIGNAL CIRCUIT.
1. Turn ignition switch “OFF”.
2. Disconnect heated oxygen sensor 2
(rear) harness connector and ECM har-
ness connector.
3. Check harness continuity between ECM
terminals and sensor.
Continuity should exist.
4. Check harness continuity between ECM
and sensor 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
(LH) or
F14
,
F131
(RH)
I
Harness connectors
E19
,
E102
(LH)
If OK, check harness for
short to ground and short to
power.
CHECK GROUND CIRCUIT.
1. Turn ignition switch “OFF”.
2. Loosen and retighten ground screws.
3. Check harness continuity between termi-
nal
q
3
and engine ground.
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
(LH) or
F14
,
F131
(RH)
I
Harness connectors
E19
,
E102
(LH)
I
Harness connectors
F62
,
F61
I
Harness for open or short
between heated oxygen
sensor 2 (rear) and
engine ground
If OK, check harness for
short to ground and short to
power.
CHECK COMPONENT [Heated oxygen
sensor 2 (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
DTC
Terminals
Bank
(Harness
protector
color)
ECM
Sensor
P0138
90
2
B1 (White)
P0158
89
2
B2 (Red)
DTC
Terminals
Bank
(Harness
protector
color)
ECM or
sensor
Ground
P0138
90 or 2
Ground
B1 (White)
P0158
89 or 2
Ground
B2 (Red)
TROUBLE DIAGNOSIS FOR DTC P0138 (B1), P0158 (B2)
Heated Oxygen Sensor 2 (Rear) (P0138: Bank
1), (P0158: Bank 2) (Max. Voltage Monitoring)
(Cont’d)
H
H
H
H
H
EC-224
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