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.
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 |
