Infiniti Q45. Manual - part 402

DTC P0131, P0151 A/F SENSOR 1

EC-247

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3.

Check “A/F SEN1 (B1)” or “A/F SEN1 (B2)” indication.
If the indication is constantly approx. 0V, go to 

EC-251, "Diag-

nostic Procedure"

 .

If the indication is not constantly approx. 0V, go to next step.

4.

Turn ignition switch OFF, wait at least 10 seconds and then
restart engine.

5.

Drive and accelerate vehicle to more than 40 km/h (25 MPH)
within 20 seconds after restarting engine.

6.

Maintain the following conditions for about 20 consecutive sec-
onds.

NOTE:

●

Keep the accelerator pedal as steady as possible during the cruising.

●

If this procedure is not completed within 1 minute after restarting engine at step 4, return to step
4.

7.

If 1st trip DTC is displayed, go to 

EC-251, "Diagnostic Procedure"

 .

 WITH GST

Follow the procedure “WITH CONSULT-II” above.

ENG SPEED

1,000 - 3,200 rpm

VHCL SPEED SE

More than 40 km/h (25 MPH)

B/FUEL SCHDL

1.5 - 9.0 msec

Gear position

Suitable position

SEF581Z

EC-248

DTC P0131, P0151 A/F SENSOR 1

Wiring Diagram

NBS002XA

BANK 1

TBWM1224E

DTC P0131, P0151 A/F SENSOR 1

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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.)

TER-

MINAL 

NO.

WIRE 

COLOR

ITEM

CONDITION

DATA (DC Voltage)

2

OR

A/F sensor 1 heater
(bank 1)

[Engine is running]

●

Warm-up condition

●

Idle speed

Approximately 5V

16

W

A/F sensor 1 (bank 1)

[Engine is running]

●

Warm-up condition

●

Idle speed

Approximately 3.1V

35

R

Approximately 2.6V

56

R/L

Approximately 2.3V

75

BR

Approximately 2.3V

PBIB1584E

EC-250

DTC P0131, P0151 A/F SENSOR 1

BANK 2

TBWM1225E