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 does 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 materialize cruise control function without any special devices.
Throttle Angle(˚) | Output Voltage(V) [Vref = 5.0V] | |
TPS1 | TPS2 | |
0˚ | 0V | 5.0V |
10˚ | 0.5V | 4.5V |
20˚ | 0.9V | 4.1V |
30˚ | 1.4V | 3.6V |
40˚ | 1.8V | 3.2V |
50˚ | 2.3V | 2.7V |
60˚ | 2.7V | 2.3V |
70˚ | 3.2V | 1.8V |
80˚ | 3.6V | 1.4V |
90˚ | 4.1V | 0.9V |
100˚ | 4.5V | 0.5V |
110˚ | 5.0V | 0V |
Item | Sensor Resistance |
TPS1 | 4.0 ~ 6.0㏀ at 20℃ (68℉) |
TPS2 | 2.72 ~ 4.08㏀ at 20℃ (68℉) |
Item | Sensor Resistance |
Coil Resistance (Ω) | 1.275 ~ 1.725Ω at 20℃ (68℉) |
Mode | Description | Symptom | Possible Cause | |
MODE 1 | FORCED ENGINE SHUTDOWN | Engine stop | ● ETC system can't proceed reliable algorithm procedure
| |
MODE 2 | FORCED IDLE ＆ POWER MANAGEMENT | Forced idle state controlled by fuel quantity regulation and ignition timing adjustment | ● ETC system can't control engine power via throttle device ● Disabled throttle control or broken throttle position information | |
MODE 3 | FORCED IDLE | Forced idle state and no response for accelerator activation | ● No information about the accelerator position
| |
MODE 4 | LIMIT PERFORMANCE ＆ POWER MANAGEMENT | Engine power is determined by accelerator position and idle power requirement (Limited vehicle running) | ● ETC system can't securely control engine power | |
MODE 5 | LIMIT PERFORMANCE | 1. Engine power varies with accelerator position, but driver perceives lack of engine power. 2. MIL ON (Normal vehicle running) | ● Not reliable accelerator position signal or bad maximum power generation
| |
MODE 6 | NORMAL | Normal |
