ETC (Electric Throttle control) System

INSPECTION

ETC (Electronic Throttle Control) system is electronically controlled throttle device which controls the throttle valve. It consists of ETC motor, throttle body and throttle position sensor (TPS). A mechanical throttle control system receives a driver's intention via a wire cable between the accelerator and the throttle valve, while this ETC system uses the signal from the Accelerator Position Sensor (APS) installed on the accelerator pedal. After the PCM receives the APS signal and calculates the throttle opening angle, it activates the throttle valve by using the ETC motor. Additionally, it can handle cruise control function without any special devices.










SCHEMATIC DIAGRAM





SPECIFICATION
[THROTTLE POSITION SENSOR]














[ETC MOTOR]






CIRCUIT DIAGRAM




FAIL-SAFE MODE






COMPONENT INSPECTION
1. Connect a scantool on Diagnosis Link Connector (DLC).
2. Start engine and check output voltages of TPS 1 and 2 at C.T and W.O.T.





3. Turn ignition switch OFF and disconnect the scantool from the DLC.
4. Disconnect ETC module connector and measure resistance between ETC module terminals 4 and 1 (TPS 1).
5. Measure resistance between ETC module terminals 7 and 6 (TPS 2).





Specification: Refer to SPECIFICATION.

ETC MOTOR
1. Disconnect ETC module connector and measure resistance between ETC module terminals 5 and 8.





Specification: Refer to SPECIFICATION.

ETC SYSTEM INITIALIZATION
1. Erase DTC(s) memorized in PCM with a scan tool.
2. Turn ignition switch off and wait for about 10 seconds.
3. Turn ignition switch on for more then 1 second. (At this time, the PCM records initial position of ETC motor on its EEPROM).