Infiniti Q45. Manual - part 509

DTC P2138 APP SENSOR

EC-675

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15. 

REPLACE ACCELERATOR PEDAL ASSEMBLY

1.

Replace accelerator pedal assembly.

2.

Perform 

EC-77, "Accelerator Pedal Released Position Learning"

 .

3.

Perform 

EC-78, "Throttle Valve Closed Position Learning"

 .

4.

Perform 

EC-78, "Idle Air Volume Learning"

 .

>> INSPECTION END

16. 

CHECK INTERMITTENT INCIDENT

Refer to 

EC-145, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT"

 .

>> INSPECTION END

Component Inspection

NBS0026R

ACCELERATOR PEDAL POSITION SENSOR

1.

Reconnect all harness connectors disconnected.

2.

Turn ignition switch ON.

3.

Check voltage between ECM terminals 106 (APP sensor 1 sig-
nal), 98 (APP sensor 2 signal) and ground under the following
conditions.

4.

If NG, replace accelerator pedal assembly and go to next step.

5.

Perform 

EC-77, "Accelerator Pedal Released Position Learning"

 .

6.

Perform 

EC-78, "Throttle Valve Closed Position Learning"

 .

7.

Perform 

EC-78, "Idle Air Volume Learning"

 .

Removal and Installation

NBS0026S

ACCELERATOR PEDAL

Refer to 

ACC-3, "ACCELERATOR CONTROL SYSTEM"

 .

Terminal

Accelerator pedal

Voltage

106
 (Accelerator pedal position 
sensor 1)

Fully released

0.5 - 1.0V

Fully depressed

3.9 - 4.7V

98
(Accelerator pedal position 
sensor 2)

Fully released

0.15 - 0.60V

Fully depressed

1.95 - 2.40V

MBIB0023E

EC-676

DTC P2A00, P2A03 A/F SENSOR 1

DTC P2A00, P2A03 A/F SENSOR 1

PFP:22693

Component Description

NBS002Y2

The air fuel ratio (A/F) sensor 1 is a planar dual-cell limit current sen-
sor. The sensor element of the A/F sensor 1 is the combination of a
Nernst concentration cell (sensor cell) with an oxygen-pump cell,
which transports ions. It has a heater in the element.
The sensor is capable of precise measurement   = 1, but also in the
lean and rich range. Together with its control electronics, the sensor
outputs a clear, continuous signal throughout a wide   range (0.7 <

 < air).

The exhaust gas components diffuse through the diffusion gap at the
electrode of the oxygen pump and Nernst concentration cell, where
they are brought to thermodynamic balance.

An electronic circuit controls the pump current through the oxygen-
pump cell so that the composition of the exhaust gas in the diffusion
gap remains constant at   = 1. Therefore, the A/F sensor 1 is able to
indicate air/fuel ratio by this pumping of current. In addition, a heater
is integrated in the sensor to ensure the required operating tempera-
ture of 700 - 800

°

C (1,292 - 1,472

°

F).

CONSULT-II Reference Value in Data Monitor Mode

NBS002Y3

Specification data are reference values.

On Board Diagnosis Logic

NBS002Y4

To judge the malfunction, the A/F signal computed by ECM from the A/F sensor 1 signal is monitored not to be
shifted to LEAN side or RICH side.

DTC Confirmation Procedure

NBS002Y5

NOTE:
If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at
least 10 seconds before conducting the next test.
TESTING CONDITION:
Before performing the following procedure, confirm that battery voltage is more than 11V at idle.

 WITH CONSULT-II

1.

Start engine and warm it up to normal operating temperature.

2.

Turn ignition switch OFF and wait at least 10 seconds.

3.

Turn ignition switch ON and select “SELF-LEARNING CONT” in “WORK SUPPORT” mode with CON-
SULT-II.

SEF579Z

SEF580Z

MONITOR ITEM

CONDITION

SPECIFICATION

A/F SEN1 (B1)
A/F SEN1 (B2)

●

Engine: After warming up

Maintaining engine speed at 2,000 rpm

Fluctuates around 1.5 V

DTC No.

Trouble diagnosis name

DTC detecting condition

Possible Cause

P2A00
2A00
(Bank 1)

Air fuel ratio (A/F) sensor 1 
circuit range/performance

●

The output voltage computed by ECM from the 
A/F sensor 1 signal is shifted to the lean side 
for a specified period.

●

The A/F signal computed by ECM from the A/F 
sensor 1 signal is shifted to the rich side for a 
specified period.

●

A/F sensor 1

●

A/F sensor 1 heater

●

Fuel pressure

●

Fuel injector

●

Intake air leaks

P2A03
2A03
(Bank 2)

DTC P2A00, P2A03 A/F SENSOR 1

EC-677

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4.

Clear the self-learning coefficient by touching “CLEAR”.

5.

Turn ignition switch OFF and wait at least 10 seconds.

6.

Start engine and keep the engine speed between 3,500 and
4,000 rpm for 1 minute under no load.

7.

Let engine idle for 1 minute.

8.

Keep engine speed between 2,500 and 3,000 rpm for 20 min-
utes.

9.

If 1st trip DTC is detected, go to 

EC-681, "Diagnostic Procedure"

.

 WITH GST

1.

Start engine and warm it up to normal operating temperature.

2.

Turn ignition switch OFF and wait at least 10 seconds.

3.

Disconnect mass air flow sensor harness connector.

4.

Start engine and let it idle for at least 5 seconds.

5.

Stop engine and reconnect mass air flow sensor harness con-
nector.

6.

Select Service $03 with GST and make sure that DTC P0102 is
detected.

7.

Select Service $04 with GST and erase the DTC P0102.

8.

Start engine and keep the engine speed between 3,500 and
4,000 rpm for 1 minute under no load.

9.

Let engine idle for 1 minute.

10. Keep engine speed between 2,500 and 3,000 rpm for 20 min-

utes.

11. Select Service $07 with GST.

If 1st trip DTC is detected, go to 

EC-681, "Diagnostic Procedure"

 .

SEF968Y

PBIB2418E

EC-678

DTC P2A00, P2A03 A/F SENSOR 1

Wiring Diagram 

NBS002Y6

BANK 1

TBWM1224E