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 throttle body contains the actuator, the throttle plate and the throttle position sensor (potentiometer), which are integrated in one housing. The actuator consists of a DC motor with a two-stage gear. The opening angle of the throttle valve is detected by the throttle position sensor which is mounted on the throttle body. And it provides feedback to the ECM to control the throttle motor in order to control the throttle valve opening angle properly in response to the driving condition.
Checking throttle valve return state under detecting condition, if an output signal is within the threshold value for more than designated time, ECM sets P1523.
Item | Detecting Condition | Possible cause |
DTC Strategy |
•
Monitor throttle valve return state | 1. Carbon in throttle 2. Broken Throttle return spring 3. throttle sticky 4. throttle icy |
Enable Conditions |
•
ETC Power Control Mode
•
TPS 1 & 2 = normal
•
Sensor Supply voltage = Normal | |
Threshold value |
•
The throttle did not return to default range within 1 to 4 seconds of turning off. That is, (TPS1's signal > 0.9V AND TPS1's signal < 1.85V) or (TPS2's signal < 1.85V AND TPS2's signal > 0.9V) when the power to the ETC motor is turned off. | |
Diagnosis Time |
•
Continuous | |
MIL On Condition |
•
DTC only (NO MIL ON) |
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 data of TPS1 & TPS2 with no accel padal depressed under IG ON condition
Fig.2) Normal data of TPS1 & TPS2 with accel padal depressed under IG ON condition
Fig.3) Normal data of TPS1 & TPS2 under open condition
