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 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
? Contineous (Within 20 sec.)
MIL On Condition
? 1 Driving Cycle
Air Flow (kg/h)
Frequency (Hz)
12.6
2617
57.6
4399
270
7240
18
2958
72
4704
360
7957
23.4
3241
108
5329
486
8738
32.4
3653
144
5897
666
9644
43.2
4024
198
6553
900
10590
Throttle opening ( ° )
Output voltage(V) [Vref=5.0]
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°
90°
40°
100°
50°
110°
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