Infiniti M35/M45 Y50. Manual — part 444
DTC P0131, P0151 A/F SENSOR 1
EC-249
[VQ35DE]
C
D
E
F
G
H
I
J
K
L
M
A
EC
Specification data are reference values and are measured between each terminal and ground.
Pulse signal is measured by CONSULT-II.
CAUTION:
Do not use ECM ground terminals when measuring input/output voltage. Doing so may result in dam-
age to the ECM's transistor. Use a ground other than ECM terminals, such as the ground.
: Average voltage for pulse signal (Actual pulse signal can be confirmed by oscilloscope.)
Diagnostic Procedure
NBS004WL
1.
CHECK GROUND CONNECTIONS
1.
Turn ignition switch OFF.
2.
Loosen and retighten two ground screws on the body.
Refer to
OK or NG
OK
>> GO TO 2.
NG
>> Repair or replace ground connections.
TER-
MINAL
NO.
WIRE
COLOR
ITEM
CONDITION
DATA (DC Voltage)
24
O
A/F sensor 1 heater
(bank 2)
[Engine is running]
●
Warm-up condition
●
Idle speed
Approximately 5V
57
GR/L
A/F sensor 1 (bank 2)
[Engine is running]
●
Warm-up condition
●
Idle speed
Approximately 2.6V
58
LG/B
Approximately 2.3V
76
W/L
Approximately 3.1V
77
Y
Approximately 2.3V
PBIB1584E
1.
Body ground M70
2.
Body ground M16
PBIB2782E
EC-250
[VQ35DE]
DTC P0131, P0151 A/F SENSOR 1
2.
CHECK AIR FUEL RATIO (A/F) SENSOR 1 POWER SUPPLY CIRCUIT
1.
Disconnect A/F sensor 1 harness connector.
2.
Turn ignition switch ON.
3.
Check voltage between A/F sensor 1 terminal 3 and ground with
CONSULT-II or tester.
OK or NG
OK
>> GO TO 4.
NG
>> GO TO 3.
3.
DETECT MALFUNCTIONING PART
Check the following.
●
Harness connectors E12, F3
●
IPDM E/R harness connector E7
●
15A fuse
●
Harness for open or short between A/F sensor 1 and fuse
>> Repair or replace harness or connectors.
Voltage: Battery voltage
PBIB2794E
PBIB1683E
DTC P0131, P0151 A/F SENSOR 1
EC-251
[VQ35DE]
C
D
E
F
G
H
I
J
K
L
M
A
EC
4.
CHECK A/F SENSOR 1 INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1.
Turn ignition switch OFF.
2.
Disconnect ECM harness connector.
3.
Check harness continuity between A/F sensor 1 terminal and ECM terminal as follows.
Refer to Wiring Diagram.
4.
Check harness continuity between the following terminals and ground.
Refer to Wiring Diagram.
5.
Also check harness for short to power.
OK or NG
OK
>> GO TO 5.
NG
>> Repair open circuit or short to ground or short to power in harness or connectors.
5.
CHECK INTERMITTENT INCIDENT
Perform
EC-153, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT"
OK or NG
OK
>> GO TO 6.
NG
>> Repair or replace.
6.
REPLACE AIR FUEL RATIO (A/F) SENSOR 1
Replace malfunctioning air fuel ratio (A/F) sensor 1.
CAUTION:
●
Discard any A/F 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.
●
Before installing new A/F sensor, clean exhaust system threads using Oxygen Sensor Thread
Cleaner tool J-43897-18 or J-43897-12 and approved anti-seize lubricant.
>> INSPECTION END
A/F sensor 1 terminal
ECM terminal
Bank1
1
16
2
75
5
35
6
56
Bank 2
1
76
2
77
5
57
6
58
Continuity should exist.
Bank 1
Bank 2
A/F sensor 1 terminal
ECM terminal
A/F sensor 1 terminal
ECM terminal
1
16
1
76
2
75
2
77
5
35
5
57
6
56
6
58
Continuity should not exist.
EC-252
[VQ35DE]
DTC P0131, P0151 A/F SENSOR 1
Removal and Installation
NBS004WM
AIR FUEL RATIO (A/F) SENSOR 1
Refer to
.
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