Infiniti Q45 (FY33). Manual — part 175
BANK 1
TEC787
GI
MA
EM
LC
FE
AT
PD
FA
RA
BR
ST
RS
BT
HA
EL
IDX
TROUBLE DIAGNOSIS FOR DTC P0139 (B1), P0159 (B2)
Heated Oxygen Sensor 2 (Rear) (P0139: Bank
1), (P0159: Bank 2) (Response Monitoring)
(Cont’d)
EC-229
BANK 2
TEC788
TROUBLE DIAGNOSIS FOR DTC P0139 (B1), P0159 (B2)
Heated Oxygen Sensor 2 (Rear) (P0139: Bank
1), (P0159: Bank 2) (Response Monitoring)
(Cont’d)
EC-230
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
(LH) or
F14
,
F131
(RH)
I
Harness connectors
E19
,
E102
(LH)
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)].
Refer to “COMPONENT INSPECTION” on next
page.
OK
E
NG
REPLACE HO2S2 (rear).
1. Check HO2S2 (rear) harness
protector color.
White: Left bank (B1)
Red: Right bank (B2)
2. Replace malfunctioning
HO2S2 (rear).
Perform “TROUBLE DIAGNOSIS FOR INTER-
MITTENT INCIDENT”, EC-117.
OK
INSPECTION END
DTC
Terminals
Bank
(Harness
protector
color)
ECM
Sensor
P0139
90
2
B1 (White)
P0159
89
2
B2 (Red)
DTC
Terminals
Bank
(Harness
protector
color)
ECM or
sensor
Ground
P0139
90 or 2
Ground
B1 (White)
P0159
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 P0139 (B1), P0159 (B2)
Heated Oxygen Sensor 2 (Rear) (P0139: Bank
1), (P0159: Bank 2) (Response Monitoring)
(Cont’d)
H
H
H
H
H
H
EC-231
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.
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 P0139 (B1), P0159 (B2)
Heated Oxygen Sensor 2 (Rear) (P0139: Bank
1), (P0159: Bank 2) (Response Monitoring)
(Cont’d)
EC-232
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