The Electronic Throttle Control(ETC) system consists of the 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 ECM controls the throttle motor to open and close the throttle valve. The 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. The TPS provides feedback to the ECM to control the throttle motor in order to control the throttle valve opening angle properly in response to the driver's demands.
Checking output signals from TPS2 every 8.5 sec. under detecting condition, if an output signal is above 4.75V for more than 0.1 sec., ECM sets P0223.
Item | Detecting Condition | Possible Cause |
DTC Strategy |
•
Signal high |
•
Poor connection
•
Short to battery in signal harness
•
Open in ground harness
•
TPS
•
ECM |
Enable Conditions |
•
IG "ON" | |
Threshold value |
•
The voltage of TPS > 4.75V | |
Diagnosis Time |
•
Continuous (more than 0.1 sec. failure for every 8.5 sec.test) | |
MIL On Condition |
•
1 driving cycles |
Throttle Opening (˚) | Output Voltage (V) [Vref=5.0] | |
TPS1 | TPS2 | |
0˚ | 0.0V | 5.0V |
10˚ | 0.5V | 4.5V |
20˚ | 0.9V | 4.1V |
30˚ | 1.4V | 3.6V |
40˚ | 1.8V | 3.2V |
50˚ | 2.3V | 2.7V |
60˚ | 2.7V | 2.3V |
70˚ | 3.2V | 1.8V |
80˚ | 3.6V | 1.4V |
90˚ | 4.1V | 0.9V |
100˚ | 4.5V | 0.5V |
110˚ | 5.0V | 0.0V |
Fig.1) Normal waveform of TPS1 & TPS2 with no accel padal depressed under IG ON condition
Fig.2) Normal waveform of TPS1 & TPS2 with accel padal depressed under IG ON condition
Fig.3) Normal data of TPS1 & TPS2 under IG ON condition
Fig.4) Normal data of TPS1 & TPS2 under open condition
Fig.5) Normal data of TPS1 & TPS2 under short to ground in TSP2 circuit
