ETC(Electronic Throttle Control Valve) is the device controlling amount of air to engine acccording to driver’s intension. Different from the existing mechanical throttle valve which is composed of accelerator pecal and connecting wire cable, ETC consists of a motor, a throttle body and a throttle position sensor. Receiving input signals from electronic accelerator pedal module, PCM lets ETC motor control throttle valve. With ETC, cruise control system works without any additional device.
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 and then MIL(Malfunction Indication Lamp) turns on.
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 |
