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 2, under detecting condition, if output signals are below the threshold, PCM sets P2127 and then MIL(Malfunction Indication Lamp) turns on.
Item
Detecting Condition
Possible Cause
DTC Strategy
? This code detects a continuous short to ground or open in either the circuit or the sensor
? Poor connection
? Open or short to ground in Power circuit.
? Open or short to ground in signal circuit.
? Faulty APS
? Faulty PCM
Enable Conditions
? Ignition "ON"
Threshold value
? APS2 < 0.125V
Diagnosis Time
? Contineous (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