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 and 2, under detecting condition, if output signals difference between APS 1 and 2 are detected more than 4.5% for the specified number of times., PCM sets P2138 and then MIL(Malfunction Indication Lamp) turns on.
Item
Detecting Condition
Possible Cause
DTC Strategy
? This code detects a correlation error between APS 1 and APS 2
? Poor connection
? Open or short in APS Circuit
? Faulty APS
? Faulty PCM
Enable Conditions
? Ignition "ON"
Threshold value
? Difference between APS1 and APS2 Normalized values > 4.5%
Diagnosis Time
? Contineous
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