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 2 is for plausibility of load request signal and decide whether or not APS 1 & 2 is malfunctioning.
If the signal exceeds threshold value, the ECM judged this as a fault and DTC is set.
Item | Detecting Condition | Possible Cause |
DTC Strategy | ● Voltage range check | ● Short to ground in power circuit ● Short to battery in power circuit ● Open in power circuit ● Faulty APS 2 ● Faulty ECM |
Enable Conditions | ● Engine run | |
Threshold Value | ● 4.7 V < Sensor supply voltage < 5.1 V | |
Diagnostic Time | ● 0.1 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 |
