Infiniti QX4 (R50). Manual — part 194
LEFT BANK
NBEC0128S02
MEC950C
GI
MA
EM
LC
FE
AT
TF
PD
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
DTC P0135, P0155 HEATED OXYGEN SENSOR 1 HEATER (FRONT) (BANK
1)/(BANK 2)
Wiring Diagram (Cont’d)
EC-243
Diagnostic Procedure
NBEC0129
1
CHECK HO2S1 (FRONT) POWER SUPPLY CIRCUIT
1. Turn ignition switch “OFF”.
2. Check heated oxygen sensor 1 (front) harness protector color.
SEF505Y
3. Disconnect corresponding heated oxygen sensor 1 (front) harness connector.
SEF965Y
SEF966Y
4. Turn ignition switch “ON”.
5. Check voltage between HO2S1 (front) terminal 1 and ground with CONSULT-II or tester.
SEF970Y
OK or NG
OK
©
GO TO 3.
NG
©
GO TO 2.
DTC P0135, P0155 HEATED OXYGEN SENSOR 1 HEATER (FRONT) (BANK
1)/(BANK 2)
Diagnostic Procedure
EC-244
2
DETECT MALFUNCTIONING PART
Check the following.
I
Harness connectors M32, F23
I
Fuse block (J/B) connector M10
I
15A fuse
I
Harness for open or short between heated oxygen sensor 1 (front) and fuse
©
Repair harness or connectors.
3
CHECK HO2S1 (FRONT) OUTPUT CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch “OFF”.
2. Disconnect ECM harness connector.
3. Check harness continuity between ECM terminal and HO2S1 terminal as follows.
Refer to Wiring Diagram.
MTBL0520
Continuity should exist.
4. Also check harness for short to ground and short to power.
OK or NG
OK
©
GO TO 4.
NG
©
Repair open circuit or short to ground or short to power in harness or connectors.
4
CHECK HEATED OXYGEN SENSOR 1 HEATER (FRONT)
Check resistance between HO2S1 (front) terminals as follows.
SEF969Y
CAUTION:
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.
OK or NG
OK
©
GO TO 6.
NG
©
GO TO 5.
GI
MA
EM
LC
FE
AT
TF
PD
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
DTC P0135, P0155 HEATED OXYGEN SENSOR 1 HEATER (FRONT) (BANK
1)/(BANK 2)
Diagnostic Procedure (Cont’d)
EC-245
5
REPLACE HEATED OXYGEN SENSOR 1 (FRONT)
1. Turn ignition switch “OFF”.
2. Check heated oxygen sensor 1 (front) harness protector color.
SEF505Y
CAUTION:
Before installing new oxygen sensor, clean exhaust system threads using Oxygen Sensor Thread Cleaner tool
J-43897-18 or J-43897-12 and approved anti-seize lubricant.
©
Replace malfunctioning heated oxygen sensor 1 (front).
6
CHECK INTERMITTENT INCIDENT
Refer to “TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT”, EC-140.
©
INSPECTION END
DTC P0135, P0155 HEATED OXYGEN SENSOR 1 HEATER (FRONT) (BANK
1)/(BANK 2)
Diagnostic Procedure (Cont’d)
EC-246
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