ETC (Electronic Throttle Control) System
ETC (ELECTRONIC THROTTLE CONTROL) SYSTEMINSPECTION
FUNCTION AND OPERATION PRINCIPLE
The Electronic Throttle Control (ETC) System consists of a throttle body with an integrated control motor and throw the position sensor (TPS). Instead of the traditional throttle cable, an Accelerator Position Sensor (APS) is used to receiving driver input. The ECM uses the APS signal to calculate the target throttle angle; the position of the throttle is then adjusted via ECM control of the ETC motor. The TPS sign& is used to provide feedback regarding throttle position to the ECM. Using ETC, precise control over throttle position is possible; the need for external cruise control module/cables is eliminated.
Components:
COMPONENTS
SPECIFICATION
Specification:
[THROTTLE POSITION SENSOR]
[ETC MOTOR]
Schematic Diagram:
SCHEMATIC DIAGRAM
Fail-safe Mode:
FAIL-SAFE MODE
COMPONENT INSPECTION
THROTTLE POSITION SENSOR (TPS)
1. Connect a scantool on the Data Link Connector (DLC).
2. Start engine and check output voltages of TPS 1 and 2 at C.T and W.O.T.
Specification: Refer to SPECIFICATION.
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 8 (TPS 1).
5. Measure resistance between ETC module terminals 1 and 5 (TPS 2).
Specification: Refer to SPECIFICATION.
ETC MOTOR
6. Disconnect ETC module connector and measure resistance between ETC module terminals 2 and 3.
Specification: Refer to SPECIFICATION.
ETC SYSTEM INITIALIZATION
1. Erase the trouble codes on ECM
2. Turn the ignition key off and keep this condition until the main relay is turned off.(10 sec.)
3. Turn ignition key on more than 1 second to record the throttle motor position on the EEPROM