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 throttle valve return state, under detecting condition, if an output signal is within the threshold value for more than designated time, PCM sets P1523.
Item | Detecting Condition | Possible cause |
DTC Strategy | ● This code detects when throttle fails to return to the unpowered default position when power to the ETC motor is turned off. | ● Carbon in throttle ● Broken Throttle return spring ● Throttle sticky ● Throttle icy ● PCM |
Enable Conditions | ● Throttle Actuation Mode Previous NOT Off ● Throttle Actuation Mode is Off ● ETC Power Control Mode = Normal ● TPS 1 & 2 = normal ● Sensor Supply voltage = Normal | |
Threshold value | ● If throttle did not return to default range within calculated seconds of turning off, increment fail count. | |
Diagnosis Time | ● Continuous | |
MIL On Condition | ● DTC only (NO MIL ON) |
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 |
