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 PCM 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 difference of air flow more than threshold is detected for more than 3.9 sec., PCM sets P2173. MIL(Malfunction Indication Lamp) turns on when the malfunction lasts till 1 driving cycle.
Item | Detecting Condition | Possible Cause |
DTC Strategy | ● The engine airflow measurements not based on throttle position are compared with throttle position based estimated airflow. | ● Air Leakage between TPS and MAFS ● Faulty throttle body or intake manifold ● Faulty MAFS |
Enable Conditions | ● Engine running ● Throttle Actuation Mode is not OFF ● MAP Sensor is not failed ● MAF Sensor is not failed ● IAT sensor is not failed | |
Threshold value | Case 1 | ● Speed-Density Airflow - ETC estimated airflow > 9 g/s |
Case 2 | ● MAF reading - ETC estimated airflow > 7g/s | |
Diagnosis Time | ● Contineous (More than 3.9sec. Failure for every 15.6sec. Test) | |
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 |
