Hyundai Elantra: Engine Control System / Accelerator Position Sensor (APS)

Hyundai Elantra (CN7) 2021-2025 Service Manual / Engine Control / Fuel System / Engine Control System / Accelerator Position Sensor (APS)

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.

Specifications

Specification

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

Schematic diagrams

Circuit Diagram

Harness Connector

Repair procedures

Inspection

1.	Connect the diagnostic tool on the Data Link Connector (DLC).

2.	Switch "ON" the ignition.

Measure the output voltage of the APS 3 and 6 at C.T and W.O.T.

Specification : Refer to "Specification"

Removal

1.	Turn ignition switch OFF and disconnect the battery negative (-) terminal.

2.	Disconnect the accelerator position sensor connector (A).

3.	Remove the accelerator pedal module after loosening the nut (A).

Installation

1.	Install in the reverse order of removal.

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Other information:

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Function malfunction and limitations

Function malfunction

When High Beam Assist is not working properly, the ‘Check High Beam Assist (HBA) system’ or ‘Check HBA (High Beam Assist) system’ warning message will appear and warning light will illuminate on the cluster. Take your vehicle to an authorized HYUNDAI dealer and have the function checked.