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
? 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