FUNCTION
AND OPERATION PRINCIPLE
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.
SPECIFICATION
Pedal
Position
|
Output
Voltage (V) [Vref = 5.0V]
|
APS1
|
APS2
|
C.T
|
0.7 ~ 0.8
|
0.28 ~ 0.48
|
W.O.T
|
3.8 ~ 4.4
|
1.75 ~ 2.35
|
Item
|
Sensor
Resistance
|
APS1
|
0.7 ~ 1.3kΩ at 20°C (68°F)
|
APS2
|
1.4 ~ 2.6kΩ at 20°C
(68°F)
|
SCHEMATIC
DIAGRAM
COMPONENT
INSPECTION
| 1. |
Connect a scan tool to the Diagnosis Link
Connector (DLC). |
| 2. |
Start engine and check output voltages of
APS 1 and 2 at C.T and W.O.T.
Specification: Refer to
SPECIFICATION.
| |
| 3. |
Turn ignition switch OFF and disconnect the
scantool from the DLC. |
| 4. |
Disconnect APS connector and measure
resistance between APS terminals 4 and 5 (APS 1).
Specification: Refer to
SPECIFICATION.
| |
| 5. |
Disconnect APS connector and measure
resistance between APS terminals 1 and 6 (APS 2).
Specification: Refer to
SPECIFICATION.
| |
