ETC (ELECTRONIC THROTTLE CONTROL) MAPPING

Perfect Power Articles.

 

The Electronic Throttle Control (ETC) is a device where the throttle flap is operated by a motor, which responds to a drive signal from the ECU. These devices have taken over from the mechanical foot operated cable activation because most cars have now traction control. There are other reasons too: Starting the engine or reducing power (throttle) if something goes wrong, or preventing tire spin.


Sometimes, or if a car is used for racing, then a more aggressive throttle response is required. The SMT8 and SMT8L piggyback unit can perform this.


The ETC has a motor, which operates the throttle flap via a gearbox. The Throttle flap is coupled to two TPS sensors in a counter of offset arrangement. The ECU reads these TWO TPS sensor signals and drives the motor until it is satisfied with the position. The reason for the ‘counteracting’ TPS signal is security: if one wire breaks, then the throttle is closed and not inadvertently opened.


The ETC mapping is relatively simple: The two TPS signals coming from the ETC are routed through the SMT8 or SMT8L, and the two outputs are connected to the ECU. Two analogue channels are used, and the unit is told to apply an ‘inverted’ map modification to the second analogue channel. Then a RPM and load signal must be connected and mapping of the ETC can begin.


Present versions of the stand-alone XMS4C version have an ETC controller built in. This allows you to specify the actual throttle opening in response to your foot signal. In future a separate freestanding ETC controller is available for traction control and other special applications like crawling or speed control.


THE FOLLOWING PERFECT POWER PRODUCTS CAN DO ETC MAPPING:

 

VISIT THE FOLLOWING LINKS FOR MORE INFORMATION ON ETC MAPPING: