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.
Checking output signals from TPS under detecting condition, if the difference between real and target throttle position is above the specified value, PCM sets P0638 and then MIL(Malfunction Indication Lamp) turns on.
Item | Detecting Condition | Possible cause |
DTC Strategy | ● Detects ETS Position control problems | ● Throttle stuck ● Open in motor circuit ● Faulty motor ● Faulty PCM |
Enable Conditions | ● Engine works ● Battery voltage > 5V | |
Threshold value | Case1 | ● Rear throttle position - target throttle position > 8.8° |
Case2 | ● When real Throttle position < 44°, real throttle position - target throttle position < -8.8° | |
Case3 | ● Real throttle position - target throttle position < -22° | |
Diagnosis Time | ● Continuous (More than 0.6 seconds failure for every 15.6 seconds test ) | |
MIL On Condition | ● 1 driving cycle |
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 |
