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.
Comparing real intake air flow and the intake air flow calculated by ETS under detecting condition, if the air flow more than threshold value is detected for more than 19 sec., PCM sets P2173. And then MIL(Malfunction Indication Lamp) turns on.
Item | Detecting Condition | Possible Cause |
DTC Strategy | ● Monitor the measured engine airflow and the estimated airflow | ● Air Leakage between TPS and MAFS ● Faulty throttle body or intake manifold ● Faulty MAFS |
Enable Conditions | ● Engine running ● No faults present | |
Threshold value | Case 1 | ● MAPS reading - ETC estimated airflow > 9 g/s |
Case 2 | ● MAFS reading - ETC estimated airflow > 7g/s | |
Diagnosis Time | ● Continuous (Within 20 sec.) | |
MIL On Condition | ● 1 Driving Cycle |
Air flow (kg/h) | Frequency (Hz) | Air flow (kg/h) | Frequency (Hz) | Air flow (kg/h) | Frequency (Hz) | Air flow (kg/h) | Frequency (Hz) |
0 kg/h | 720 ~ 880 Hz | 32.4 kg/h | 3,609 Hz | 108.0 kg/h | 5,362 Hz | 360.0 kg/h | 7,945 Hz |
12.6 kg/h | 2,595 Hz | 43.2 kg/h | 3,975 Hz | 144.0 kg/h | 5,885 Hz | 486.0 kg/h | 8,736 Hz |
18.0 kg/h | 2,930 Hz | 57.6 kg/h | 4,361 Hz | 198.0 kg/h | 6,527 Hz | 666.0 kg/h | 9,660 Hz |
23.4 kg/h | 3,208 Hz | 72.0 kg/h | 4,683 Hz | 270.0 kg/h | 7,219 Hz | 900.0 kg/h | 10,613 Hz |
Throttle opening ( ° ) | Output voltage(V) [Vref=5.0] | Throttle opening ( ° ) | Output voltage(V) [Vref=5.0] | ||
TPS1 | TPS2 | TPS1 | TPS2 | ||
0° | 0.0V | 5.0V | 60° | 2.7V | 2.3V |
10° | 0.5V | 4.5V | 70° | 3.2V | 1.8V |
20° | 0.9V | 4.1V | 80° | 3.6V | 1.4V |
30° | 1.4V | 3.6V | 90° | 4.1V | 0.9V |
40° | 1.8V | 3.2V | 100° | 4.5V | 0.5V |
50° | 2.3V | 2.7V | 110° | 5.0V | 0.0V |
Pressure(kPa) | Output voltage(V) | Pressure(kPa) | Output voltage(V) |
20.0kPa | 0.79V | 60kPa | 2.369V |
35kPa | 1.382V | 90kPa | 3.75V |
46.66kPa | 1.84V | 101.32kPa | 4.00V |
