Infiniti F50. Manual - part 493

 

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Infiniti F50. Manual - part 493

 

 

DTC P2127, P2128 APP SENSOR

EC-613

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DTC P2127, P2128 APP SENSOR

PFP:18002

Component Description

EBS00MN2

Electric throttle control actuator consists of throttle control motor,
acceleration pedal position sensor, throttle position sensor, etc.
Accelerator pedal position sensor is connected to the accelerator
pedal through the throttle drum and accelerator wire, and detects the
accelerator pedal position by the throttle drum rotation angle.
Accelerator pedal position sensor has two sensors. These sensors
are a kind of potentiometers which transform the accelerator pedal
position into output voltage, and emit the voltage signal to the ECM.
In addition, these sensors detect the opening and closing speed of
the accelerator pedal and feed the voltage signals to the ECM. The
ECM judges the current opening angle of the accelerator pedal from
these signals and controls the throttle control motor based on these
signals.
Idle position of the accelerator pedal is determined by the ECM receiving the signal from the accelerator pedal
position sensor. The ECM uses this signal for the engine operation such as fuel cut.

CONSULT-II Reference Value in Data Monitor Mode

EBS00MN3

Specification data are reference values.

*: Accelerator pedal position sensor 2 signal is converted by ECM internally. Thus, it differ from ECM terminal voltage signal.

On Board Diagnosis Logic

EBS00MN4

These self-diagnoses have the one trip detection logic.

FAIL-SAFE MODE

When the malfunction is detected, ECM enters fail-safe mode and the MIL lights up.

PBIB1741E

MONITOR ITEM

CONDITION

SPECIFICATION

ACCEL SEN1
ACCEL SEN2*

Ignition switch: ON
(engine stopped)

Selector lever: “D”

Accelerator pedal: Released

More than 0.36V

Accelerator pedal: Fully depressed

Less than 4.75V

CLSD THL POS

Ignition switch: ON
(engine stopped)

Selector lever: “D”

Accelerator pedal: Released

ON

Accelerator pedal: Slightly depressed

OFF

DTC No.

Trouble diagnosis name

DTC detecting condition

Possible cause

P1227
1227

Accelerator pedal position 
sensor 2 circuit low input

An excessively low voltage from the APP 
sensor 2 is sent to ECM.

Harness or connectors
(The APP sensor 2 circuit is open or 
shorted.)

Accelerator pedal position sensor
(Accelerator pedal position sensor 2)

P1228
1228

Accelerator pedal position 
sensor 2 circuit high input

An excessively high voltage from the APP 
sensor 2 is sent to ECM.

Engine operating condition in fail-safe mode

The ECM controls the electric throttle control actuator in regulating the throttle opening in order for the idle position to be within +10 
degrees.
The ECM regulates the opening speed of the throttle valve to be slower than the normal condition.
So, the acceleration will be poor. 

EC-614

DTC P2127, P2128 APP SENSOR

DTC Confirmation Procedure

EBS00MN5

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 10V at idle.

 WITH CONSULT-II

1.

Turn ignition switch “ON”.

2.

Select “DATA MONITOR” mode with CONSULT-II.

3.

Start engine and let it idle for 1 second.

4.

If DTC is detected, go to 

EC-616, "Diagnostic Procedure"

 .

 WITH GST

Follow the procedure “With CONSULT-II” above.

SEF058Y

DTC P2127, P2128 APP SENSOR

EC-615

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Wiring Diagram

EBS00MN6

TBWM0129E

EC-616

DTC P2127, P2128 APP SENSOR

Specification data are reference values and are measured between each terminal and ground.

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.

Diagnostic Procedure

EBS00MN7

1. 

RETIGHTEN GROUND SCREWS

1.

Turn ignition switch “OFF”.

2.

Loosen and retighten engine ground screws.

>> GO TO 2.

TER-

MINAL 

NO.

WIRE 

COLOR

ITEM

CONDITION

DATA (DC Voltage)

87

L/W

Accelerator pedal position 
sensor 1

[Ignition switch “ON”]

Engine stopped

Selector lever: “D”

Accelerator pedal is released

More than 0.36V

[Ignition switch “ON”]

Engine stopped

Selector lever: “D”

Accelerator pedal is fully depressed

Less than 4.75V

89

B

Sensor ground

[Engine is running]

Warm-up condition

Idle speed

Approximately 0V

94

G

Accelerator pedal position 
sensor 2 power supply

[Ignition switch “ON”]

Approximately 2.5V

100

BR

Accelerator pedal position 
sensor 2 ground

[Ignition switch “ON”]

Approximately 0V

103

L

Sensor power supply

[Ignition switch “ON”]

Approximately 5V

117

B/R

Accelerator pedal position 
sensor 2

[Ignition switch “ON”]

Engine stopped

Selector lever: “D”

Accelerator pedal is released

More than 0.18V

[Ignition switch “ON”]

Engine stopped

Selector lever: “D”

Accelerator pedal is fully depressed

Less than 2.37V

PBIB0011E

 

 

 

 

 

 

 

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