APS(Acceleration Position Sensor) is measured the driver’s acceleration using a potentiometer and APS signal is transmitted to the ECM. The pedal’s position is calculated from the voltage of potentiometer in the APS.
The absence of a mechanical link between the accelertor pedal and injection system presents a risk of loss of control of the engine in the event of a failure of the component in the charge of providing the driver’s request information to the injection system.
Therefore, APS has the two potentiometers whose slides are mechanically solid.
APS 1 decides to the fuel quantity and injection timing in the engine.
If the signal exceeds threshold value, the ECM judges this as a fault and DTC is set.
Item | Detecting Condition | Possible Cause |
DTC Strategy | ● Signal check, high | ● Short in signal circuit of APS1 & 2 ● Open in signal circuit of APS1 & 2 ● Open in ground circuit of APS1 & 2 ● Faulty APS 1 ● Faulty APS 2 ● Faulty ECM |
Enable Conditions | ● Ignition on | |
Threshold Value | ● APS 1 - APS 2 is above 1.232 ㎷ when the APS1 and APS2 signal is below 1.2% ● APS 1 - APS 2 is above 308 ㎷ when the APS1 and APS2 signal is from 1.8 % to 1.6% ● APS 1 - APS 2 is above 406 ㎷ when the APS1 and APS2 signal is above 7 % | |
Diagnostic Time | ● 2.4 sec. | |
MIL Fuel Limit Fuel Cut EGR Off | ● Yes ● Yes ● No ● No | |
Fail safe | ● Engine speed is fixed at 1200 rpm without accel pedal sensor action. ● Engine performance is reduced. ● Air conditioning system is deactivited as against the vehicle speed and the engine rpm. ● Cruise control system inhibited. |
APS | ||
Accel pedal position | Idle Position (0%) | Fully acceleration (100%) |
Signal votage | 0.2 ~ 0.5 V | 1.6 ~ 2.5 V |
