Kia Optima: Engine Control System / Accelerator Position Sensor (APS)

Kia Optima DL3 2019-2021 Service and Repair Manual / Engine Control / Fuel System / Engine Control System / Accelerator Position Sensor (APS)

Specifications

Specification

Accelerator	Output Voltage (V) [Vref = 5.0V]
Position	APS1	APS2
C.T	0.7 - 0.8	0.33 - 0.43
W.O.T	4.13 - 4.22	2.04 - 2.13

Description and operation

Description

•	Accelerator Position Sensor (APS) is installed on the accelerator pedal module and detects the rotation angle of the accelerator pedal.

•	The APS is one of the most important sensors in engine control system, so it consists of the two sensors which adapt individual sensor power and ground line.

•	The second sensor monitors the first sensor and its output voltage is half of the first one.

•	If the ratio of the sensor 1 and 2 is out of the range (approximately 1/2), the diagnostic system judges that it is abnormal.

Schematic diagrams

Circuit Diagram

Harness Connector

Repair procedures

Inspection

The engine control system can be more quickly diagnosed for troubles by using the vehicle diagnostic system (KDS). (Refer to "DTC guide")

KDS provides the following information.

(1)	Self diagnosis : Inspects and displays diagnostic trouble code (DTC)

(2)	Sensor data : Checks the system input/output value status

(3)	Forced operation : Checks the system operating status

(4)	Additional function : Controls system options, zero point adjustment and other functions

Component Inspection

1.	Connect the KDS on the Data Link Connector (DLC).

2.	Turn the ignition switch ON.

Measure the output voltage of the APS 1 and 2 at C.T and W.O.T.

Accelerator	Output Voltage (V) [Vref = 5.0V]
Position	APS1	APS2
C.T	0.7 - 0.8	0.33 - 0.43
W.O.T	3.98 - 4.22	1.93 - 2.17

Removal

1.	Disconnect the negative battery terminal.

2.	Open the mounting cap (A).

Remove the accelerator pedal module (A) after loosening the mounting bolts.

Tightening torque :

6.9 - 10.7 N·m (0.7 - 1.1 kgf·m, 5.0 - 7.9 lb·ft)

4.	Remove the connector (A) from the accelerator pedal module (B).

Installation

•	Install the component to the specified torque.

•	Note that internal damage may occur when the component is dropped. In this case, use it after inspecting.

1.	Install in the reverse order of removal.

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