Accelerator Position Sensor is an important sensor that transmit driver’s accelerating intention to ECM for determining fuel injection quantity corresponds to the current acceleration as same mechanism with TPS.
For importance of this sensor, reliability is strongly required. thus, APS consists of APS1 from which main signal comes and APS2 which is for monitoring normal operation of APS1.
APS 1 and 2 have power supply and ground independently. the signal voltage of APS 2 is 1/2 of APS 1. When the ratio of signal of APS 1 and APS 2 is above certain value, error is recognizes and Limp home mode is activated.
When Limp home mode is activated only restricted driving is possible because engine speed is fixed at 1200RPM to protect engine from excessive power generation due to abnormal APS signal.
P0220 is set when APS 2 power supply is detected below 4.7V or above 5.1V for more than 0.1 sec. This code is due to the short to ground of APS 2 power circuit, short to power line above 5V, the errors related to ECM internal power supply.
Item
Detecting Condition
Possible Cause
DTC Strategy
? Voltage monitoring
? APS 2 Circuit
? APS component
? ECM component
Enable Conditions
? Ignition "ON"
Threshold Value
? When Sensor power supply2 is below 4.7V or above 5.1V
Diagnostic Time
? 100ms
Fail Safe
Fuel Cut
No
? Limp home idle is fixed at (1200RPM)
? A/C operation stops according to Vehicle/Engine speed
? Cruise control deactivated (for Cruise control option applied vehicle)
EGR Off
Fuel Limit
YES
MIL
Sensor Power Supply 2
Sensor Power Supply 2 related Sensors
4.7~5.1V
APS 2, RPS