The accelerator pedal position sensor is installed on the upper end
of the accelerator pedal assembly. The sensor detects the accelera-
tor position and sends a signal to the ECM.
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 oper-
ation such as fuel cut.

CONSULT-III Reference Value in Data Monitor Mode

INFOID:0000000001327009

Specification data are reference values.

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

On Board Diagnosis Logic

INFOID:0000000001327010

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.

DTC Confirmation Procedure

INFOID:0000000001327011

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.

PBIB1741E

MONITOR ITEM

CONDITION

SPECIFICATION

ACCEL SEN 1

• Ignition switch: ON

(Engine stopped)

Accelerator pedal: Fully released

0.5 - 1.0V

Accelerator pedal: Fully depressed

4.0 - 4.8V

ACCEL SEN 2*

• Ignition switch: ON

(Engine stopped)

Accelerator pedal: Fully released

0.3 - 1.2V

Accelerator pedal: Fully depressed

3.9 - 4.8V

CLSD THL POS

• Ignition switch: ON

(Engine stopped)

Accelerator pedal: Fully released

Accelerator pedal: Slightly depressed

OFF

DTC No.

Trouble diagnosis name

DTC detecting condition

Possible cause

P2127
2127

Accelerator pedal posi-
tion sensor 2 circuit low
input

An excessively low voltage from the APP sen-
sor 2 is sent to ECM.

• Harness or connectors

(APP sensor 2 circuit is open or shorted.)
(TP sensor circuit is shorted.)

• Accelerator pedal position sensor

(APP sensor 2)

• Electric throttle control actuator

(TP sensor 1 and 2)

P2128
2128

Accelerator pedal posi-
tion sensor 2 circuit high
input

An excessively high voltage from the APP sen-
sor 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.

DTC P2127, P2128 APP SENSOR

EC-1111

< SERVICE INFORMATION >

[VK45DE]

TESTING CONDITION:
Before performing the following procedure, confirm that battery voltage is more than 8V at idle.
1.

Start engine and let it idle for 1 second.

Check DTC.

If DTC is detected, go to

EC-1112, "Diagnosis Procedure"

Wiring Diagram

INFOID:0000000001327012

TBWM1355E

EC-1112

< SERVICE INFORMATION >

[VK45DE]

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.

Diagnosis Procedure

INFOID:0000000001327013

CHECK GROUND CONNECTIONS

Turn ignition switch OFF.

Loosen and retighten three ground screws on the body.
Refer to

EC-723, "Ground Inspection"

OK or NG

>> GO TO 2.

>> Repair or replace ground connections.

CHECK APP SENSOR 2 POWER SUPPLY CIRCUIT-I

TER-

MI-

NAL

NO.

WIRE

COLOR

ITEM

CONDITION

DATA (DC Voltage)

Sensor power supply (Throt-
tle position sensor)

[Ignition switch: ON]

Approximately 5V

B/W

Sensor ground
(APP sensor 1 / ICC steering
switch / ASCD steering
switch)

[Engine is running]
• Warm-up condition
• Idle speed

Approximately 0V

G/OR

Sensor ground
(APP sensor 2)

[Engine is running]
• Warm-up condition
• Idle speed

Approximately 0V

L/B

Sensor power supply
(APP sensor 1)

[Ignition switch: ON]

Approximately 5V

Sensor power supply
(APP sensor 2)

[Ignition switch: ON]

Approximately 5V

Y/R

Accelerator pedal position
sensor 2

[Ignition switch: ON]
• Engine stopped
• Accelerator pedal: Fully released

0.15 - 0.60V

[Ignition switch: ON]
• Engine stopped
• Accelerator pedal: Fully depressed

1.95 - 2.40V

106

Accelerator pedal position
sensor 1

[Ignition switch: ON]
• Engine stopped
• Accelerator pedal: Fully released

0.5 - 1.0V

[Ignition switch: ON]
• Engine stopped
• Accelerator pedal: Fully depressed

3.9 - 4.7V

PBIB2195E

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