Infiniti M35/M45 Y50. Manual - part 724

DTC P2A00, P2A03 A/F SENSOR 1

EC-1369

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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 

EC-864, "Ground Inspection"

 .

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

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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 

EC-770, "HOW TO ERASE

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 

EC-1022, "DTC

P0171, P0174 FUEL INJECTION SYSTEM FUNCTION"

  or 

EC-1033, "DTC P0172, P0175 FUEL

INJECTION SYSTEM FUNCTION"

 .

No

>> GO TO 5.

SEF968Y

PBIB2682E