Operation CHARM: Car repair manuals for everyone.

General Information





Component Location





General Description

The Electronic Throttle Control (ETC) system consist of the Accelerator Position Sensors (APS) and the Throttle Body which houses the Throttle Position Sensors (TPS). TPS 1 & 2 share the same source voltage and ground. The throttle valve is moved by a throttle motor which is housed in the Throttle Body and controlled by the ECM. As the throttle is opened, TPS1 output signal increase smoothly while TPS2 output signal will decrease. The APS sends signals to the ECM with the driver's request. The ECM then commands the throttle motor to move the throttle valve. The TPS provides feedback to the ECM on the throttle valve movement.

DTC Description

ECM sets DTC P2101 if ECM detects open or short to ground in ETC motor control circuit.

DTC Detecting Condition





Diagnostic Circuit Diagram





Signal Waveform & Data








Fig 1) Normal waveform of ETC motor & TPS1 at idle.
Fig 2) Normal waveform of ETC motor & TPS1 with deceleration.