The Electronic Throttle Control(ETC) system is made of the components throttle body, Throttle Position Sensor(TPS) 1&2 and Accelerator Position Sensor(APS)1&2.The APS is mounted in the accelerator pedal to detect the opening angle of the accelerator pedal. It has 2 sensors to detect the accelerator position and a malfunction of the accelerator position sensor. The PCM judges the current opening angle of the accelerator pedal from APS1&2, and the PCM controls the throttle motor based on these signals.
PCM sets DTC P2127 if the PCM detects output voltage lower than the possible range of a properly operating APS2.
Item
Detecting Condition
Possible Cause
DTC Strategy
Electrical Check
Open or Short to ground in power circuit
Open or short to ground in signal circuit
Poor connection or damaged harness
Faulty APS2
Enable Conditions
No error for power supply circuit in APS2
APS1 > 1V
Threshold Value
APS1 < 0.13V
Diagnostic Time
0.3 sec.
MIL On Condition
1 Drive Cycle
Limp-Home
Forced limited power mode : The PCM limits opening angle of the throttle valve to max. 50% and engine torque to a certain pre-determined value.
After idle recognition, the PCM uses APS1 signal to calculate the current opening angle of the throttle valve.