APS(Acceleration Position Sensor) measures driver’s accelerating intension using a potentiometer and APS signal is transmitted to the PCM. The pedal’s position is converted as voltages of potentiometer in the APS.The absence of a mechanical link between the accelerator pedal and throttle valve presents a risk of loss of control of the engine in the event of a failure of the component. Therefore, APS has the two potentiometers whose slides are mechanically solid. APS 2 decides whether or not APS 1 & 2 is faulty.
Checking output signals from APS 1 under detecting condition, if output signals are above the threshold, PCM sets P2123 and then MIL(Malfunction Indication Lamp) turns on.
Item
Detecting Condition
Possible Cause
DTC Strategy
? This code detects a short to high in either the circuit or the sensor
? Poor connection
? Short to battery in signal circuit.
? Open in Ground Circuit.
? Faulty APS
? Faulty PCM
Enable Conditions
? Ignition "ON"
Threshold Value
? APS1 > 4.5V
Diagnosis Time
? Continuous (More than 0.18 sec. Failure for every 7.8 sec. Test)
MIL On Condition
? 1 Driving Cycle
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