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. TPS1&2 are sharing the same source voltage and ground. The throttle valve opening is control by throttle motor which is controlled by Engine Control Module(PCM). The opposite position indicator shows inverted signal characteristics. TPS1 output voltage increases smoothly in proportion with the throttle valve opening angle after starting. TPS2 output voltage decreases in inverse proportion with the throttle valve opening angle after starting. TPS provides feedback to the PCM to control the throttle motor in order to control the throttle valve opening angle properly in response to the driving condition.
PCM sets DTC P0222 if the PCM detects signal voltage lower than the possible range of a properly operating TPS2.
Item
Detecting Condition
Possible Cause
DTC Strategy
Short to Ground or Open circuit
Open in power supply harness or signal harness
Short to ground in power supply or signal harness
Poor connection or damaged harness
Faulty TPS2
Case1
Enable
Conditions
Ignition "ON"
Threshold
Value
TPS2 < 0.1V
Case2
In idle status
Target throttle angle < 58%
MAF Limphome detected or TPS1 failure detected
TPS2 at idle < 2.0V
Diagnostic Time
0.05 sec.
MIL On Condition
1 Drive Cycle
Limp-Home
Forced limited power mode : When the DTC is set, the PCM reduces engine torque by 25% of normal value.
The PCM uses TPS1 signal to monitor the controlled opening angle of the throttle valve.