Accelerator Pedal Position Sensor (APS)

Description and Operation

Description

The Accelerator Position Sensor (APS), installed on the accelerator pedal module, detects the angle of the accelerator pedal. The APS is one of the most important sensors in the engine control system. Therefore, each of the two sensors in the APS has a separate power supply line and ground line. The second sensor monitors the first, and its output voltage is half that of the first. If the ratio of sensor 1 to sensor 2 is out of range (approximately 1/2), the diagnostic system determines that this is abnormal.

Specifications

Specification

Accelerator Position	Output Voltage (V) [Vref = 5 V]
	VPA1	VPA2
THA	0,7 - 0,8	0,33 - 0,43
THW	3,85 - 4,35	1,93 - 2,18

Circuit Diagrams

Wiring Diagram

Harness Connector

Repair Procedures

Inspection

1. 1
   Connect the diagnostic tool to the Data Link Connector (DLC).
2. 2
   Turn the ignition on.
3. 3
   Measure the output voltage of APS 1 and 2 at C.T. and W.O.T.

   Accelerator Position	Output Voltage (V) [Vref = 5 V]
   	VPA1	VPA2
   THA	0,7 - 0,8	0,33 - 0,43
   THW	3,85 - 4,35	1,93 - 2,18

Removal

1. 1
   Turn the ignition switch OFF and disconnect the negative (-) battery terminal.
2. 2
   Disconnect the accelerator position sensor connector (A).
3. 3
   Remove the accelerator pedal position sensor (B) after loosening the mounting bolts. Accelerator pedal position sensor mounting bolt: 8.8–13.7 N·m

   

Installation

1. Install in the reverse order of removal.