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 above the threshold, PCM sets P2128 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 | ● APS2 > 3V | |
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 |
