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 |
