Component Location
General Description

The Electronic Throttle Control(ETC) system is made of the components throttle body, Throttle Position Sensor(TPS) 1&2 and Accelerator Position Sensor(APS) 1&2. The APS is mounted in the accelerator pedal to detect the opening angle of the accelerator pedal. It has 2 sensors to detect the accelerator position and a malfunction of the accelerator position sensor. The PCM judges the current opening angle of the accelerator pedal from APS1&2, and the PCM controls the throttle motor based on these signals.

DTC Description

Checking output signals from APS 1 and 2 under detecting condition, if output signals difference between APS 1 and 2 are detected more than 4.5% for the specified number of times., PCM sets P2138. And then MIL(Malfunction Indication Lamp) turns on.

DTC Detecting Condition

Item

Detecting Condition

Possible Cause

DTC Strategy

● This code detects a correlation error between APS 1 and APS 2

● Poor connection

● Open or short in APS Circuit

● Faulty APS

● Faulty PCM

Enable Conditions

● Ignition "ON"

Threshold value

● Difference between APS1 and APS2 Normalized values > 4.5%

Diagnosis Time

● Contineous

MIL On Condition

● 1 Driving Cycle

Specification

Pedal Position

Output Voltage(V) [Vref = 5.0V]

APS1

APS2

C.T

0.7 ~ 0.8V

0.275 ~ 0.475V

W.O.T

3.8 ~ 4.4V

1.75 ~ 2.35V

Schematic Diagram
Signal Waveform
Яндекс.Метрика