Infiniti M35/M45 Y50. Manual — part 724
DTC P2A00, P2A03 A/F SENSOR 1
EC-1369
[VK45DE]
C
D
E
F
G
H
I
J
K
L
M
A
EC
BANK 2
TBWT1047E
EC-1370
[VK45DE]
DTC P2A00, P2A03 A/F SENSOR 1
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
NBS005PI
1.
CHECK GROUND CONNECTIONS
1.
Turn ignition switch OFF.
2.
Loosen and retighten 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
SB
A/F sensor 1 heater
(bank 2)
[Engine is running]
●
Warm-up condition
●
Idle speed
Approximately 5V
57
BR/W
A/F sensor 1 (bank 2)
[Engine is running]
●
Warm-up condition
●
Idle speed
Approximately 2.6V
58
G/O
Approximately 2.3V
76
G/W
Approximately 3.1V
77
GR
Approximately 2.3V
PBIB1584E
1.
Body ground M70
2.
Body ground M16
PBIB2782E
DTC P2A00, P2A03 A/F SENSOR 1
EC-1371
[VK45DE]
C
D
E
F
G
H
I
J
K
L
M
A
EC
2.
RETIGHTEN AIR FUEL RATIO (A/F) SENSOR 1
1.
Loosen and retighten the air fuel ratio (A/F) sensor 1.
>> GO TO 3.
3.
CHECK FOR INTAKE AIR LEAK
1.
Start engine and run it at idle.
2.
Listen for an intake air leak after the mass air flow sensor.
OK or NG
OK
>> GO TO 4.
NG
>> Repair or replace.
1.
A/F sensor 1 (bank 1)
2.
Heated oxygen sensor 2 (bank 1)
3.
Heated oxygen sensor 2 (bank 1)
harness connector
4.
Heated oxygen sensor 2 (bank 2)
harness connector
5.
Heated oxygen sensor 2 (bank 2)
6.
A/F sensor 1 (bank 2)
Tightening torque: 50 N-m (5.1 kg-m, 37 ft-lb)
PBIB2711E
EC-1372
[VK45DE]
DTC P2A00, P2A03 A/F SENSOR 1
4.
CLEAR THE SELF-LEARNING DATA
With CONSULT-II
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 minutes at idle speed.
Is the 1st trip DTC P0171, P0172, P0174 or P0175 detected?
Is it difficult to start engine?
Without CONSULT-II
1.
Start engine and warm it up to normal operating temperature.
2.
Turn ignition switch OFF.
3.
Disconnect mass air flow sensor (1) harness connector.
4.
Restart engine and let it idle for at least 5 seconds.
5.
Stop engine and reconnect mass air flow sensor harness con-
nector.
6.
Make sure DTC P0102 is displayed.
7.
Erase the DTC memory. Refer to
EMISSION-RELATED DIAGNOSTIC INFORMATION"
8.
Make sure DTC P0000 is displayed.
9.
Run engine for at least 10 minutes at idle speed.
Is the 1st trip DTC P0171, P0172, P0174 or P0175 detected?
Is it difficult to start engine?
Yes or No
Yes
>> Perform trouble diagnosis for DTC P0171, P0174 or P0172, P0175. Refer to
P0171, P0174 FUEL INJECTION SYSTEM FUNCTION"
EC-1033, "DTC P0172, P0175 FUEL
.
No
>> GO TO 5.
SEF968Y
PBIB2682E
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