Infiniti QX4 (R50). Manual — part 192
LEFT BANK
NBEC0121S02
MEC948C
GI
MA
EM
LC
FE
AT
TF
PD
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
DTC P0134, P0154 HEATED OXYGEN SENSOR 1 (FRONT) (BANK 1)/(BANK 2)
(HIGH VOLTAGE)
Wiring Diagram (Cont’d)
EC-235
Diagnostic Procedure
NBEC0122
1
INSPECTION START
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
©
GO TO 2.
2
RETIGHTEN HEATED OXYGEN SENSOR 1 (FRONT)
Loosen and retighten corresponding heated oxygen sensor 1 (front).
Tightening torque:
40 - 60 N·m (4.1 - 6.1 kg-m, 30 - 44 ft-lb)
©
GO TO 3.
DTC P0134, P0154 HEATED OXYGEN SENSOR 1 (FRONT) (BANK 1)/(BANK 2)
(HIGH VOLTAGE)
Diagnostic Procedure
EC-236
3
CHECK HO2S1 (FRONT) INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Disconnect ECM harness connector.
2. Check harness continuity between ECM terminal and HO2S1 terminal as follows.
Refer to Wiring Diagram.
MTBL0475
Continuity should exist.
3. Check harness continuity between ECM terminal or HO2S1 terminal and ground as follows.
Refer to Wiring Diagram.
MTBL0476
Continuity should not exist.
4. Also check harness for 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 HO2S1 (FRONT) CONNECTOR FOR WATER
1. Disconnect heated oxygen sensor 1 (front) harness connector.
2. Check connectors for water.
Water should not exist.
OK or NG
OK (With CONSULT-II)
©
GO TO 5.
OK (Without CONSULT-
II)
©
GO TO 6.
NG
©
Repair or replace harness or connectors.
GI
MA
EM
LC
FE
AT
TF
PD
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
DTC P0134, P0154 HEATED OXYGEN SENSOR 1 (FRONT) (BANK 1)/(BANK 2)
(HIGH VOLTAGE)
Diagnostic Procedure (Cont’d)
EC-237
5
CHECK HEATED OXYGEN SENSOR 1 (FRONT)
With CONSULT-II
1. Start engine and warm it up to normal operating temperature.
2. Select “MANU TRIG” and adjust “TRIGGER POINT” to 100% in “DATA MONITOR” mode with CONSULT-II.
3. Select “HO2S1 (B1)/(B2)” and “HO2S1 MNTR (B1)/(B2)”.
4. Hold engine speed at 2,000 rpm under no load during the following steps.
5. Touch “RECORD” on CONSULT-II screen.
SEF967Y
6. 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 left:
SEF647Y
I
“HO2S1 (B1)/(B2)” voltage goes above 0.6V at least once.
I
“HO2S1 (B1)/(B2)” voltage goes below 0.3V at least once.
I
“HO2S1 (B1)/(B2)” voltage never exceeds 1.0V.
SEF648Y
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 8.
NG
©
GO TO 7.
DTC P0134, P0154 HEATED OXYGEN SENSOR 1 (FRONT) (BANK 1)/(BANK 2)
(HIGH VOLTAGE)
Diagnostic Procedure (Cont’d)
EC-238
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