Kia Amanti 2004-06

Electronic Throttle System

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Operation



On 2004 vehicles the ETS consists of inputs from the Accelerator Position Sensor (APS), Throttle Position Sensor (TPS), ignition switch and serial communication line, ETS motor and Limp/Home value unit. These components are used to control idle speed, throttle valve and TCS using only one motor. In the ECU and ETS the signals from the APS and TPS are most important. They have two circuits in the sensor module, one is flowed to the ECU and the other is flowed to the ETS. The ECU calculates the throttle target value with the signals from APS no. 2 (main) and TPS no. 2 (sub) and the ETS control module controls the ETS motor with the signals from the APS no. 1 (sub) and TPS no. 1 (main).

On 2005-2006 vehicles the electronic throttle system module is integrated with the PCM module. The ETS is the throttle body, whose throttle angle is controlled by the control module. It consists of and ETS motor, Accelerator Position Sensor (APS), Throttle Position Sensor (TPS), and Limp/Home value unit. The APS consists of APS no. 1 and APS no. 2 and an idle switch which detects the closed throttle position. When the driver steps on the accelerator pedal, the output signal of APS no. 1 is used for the sub signal and that of APS no. 2 is used for the main signal. If the PCM receives these signals and other input values, is calculates throttle valve target opening value and then controls the ETS motor to meet the throttle valve target opening value.

Removal & Installation



  1. Disconnect the negative battery cable.
  2.  
  3. Disconnect the sensor(s) connector(s).
  4.  
  5. Remove the sensor retaining screws. Remove the sensor(s) from its mounting.
  6.  

To install:

  1. Installation is the reverse of the removal procedure.
  2.  

Testing



Accelerator Pedal Sensor
  1. Disconnect the sensor connector.
  2.  
  3. Using an ohmmeter, measure the resistance between ground and sensor supply (APS no. 1: terminal 7 and 8. APS no. 2: terminal 1 and 2).
  4.  
  5. Specification should be 3.5-6.5 kohm.
  6.  
  7. Using an ohmmeter, measure the resistance between ground and sensor signal output (APS no. 1: terminal 6 and 7. APS no. 2: terminal 3 and 1).
  8.  
  9. Inspect the sensor signal while pressing the accelerator pedal, at this time the sensor signal will vary proportional to the accelerator pedal angle.
  10.  
  11. If the resistance is out of specification, or is not directly proportional to the accelerator pedal angle, replace the sensor.
  12.  

  1. Connect the scan tool.
  2.  
  3. With the ignition OFF, disconnect the connector.
  4.  
  5. Measure APS no. 1 and APS no. 2 signal waveform when stepping on the accelerator pedal.
  6.  
  7. Specification should be approximately 0.3-1.0 volt (when not stepping on the accelerator pedal) and approximately 4.0-5.5 volts (when stepping on the accelerator pedal).
  8.  
  9. If within specification, substitute the PCM with a known good one. Recheck for proper operation. Replace the PCM, as required.
  10.  
  11. If not within specification, substitute the TPS with a known good sensor. Recheck for proper operation. Replace the sensor, as required.
  12.  

Throttle Position Sensor
  1. Disconnect the sensor connector.
  2.  
  3. Using an ohmmeter, measure the resistance between terminal 3 (sensor ground) and terminal 1 (sensor power).
  4.  
  5. Specification should be 1.5-3.5 kohm.
  6.  
  7. Connect the ohmmeter between terminal 3 (sensor ground) and terminal 2 (sensor output).
  8.  
  9. Inspect the sensor signal while rotating the throttle valve from closed throttle to wide open throttle. At this time the sensor signal varies proportional to throttle angle.
  10.  
  11. If the resistance is out of specification, or is not directly proportional to throttle angle, replace the sensor.
  12.  

  1. Disconnect the sensor connector.
  2.  
  3. Using an ohmmeter, measure the resistance between terminal 1 and 3 of the connector.
  4.  
  5. Specification should be 3.5-6.5 kohm.
  6.  
  7. Connect the ohmmeter between terminal 2 and 3 of the TPS no. 1 connector and measure the resistance (resistance should change smoothly in proportion with the throttle valve opening angle).
  8.  
  9. Connect the ohmmeter between terminal 3 and 4 of the TPS no. 2 connector and measure the resistance (resistance should change smoothly in inverse proportion with the throttle valve opening angle).
  10.  
  11. If within specification, substitute the PCM with a known good one. Recheck for proper operation. Replace the PCM, as required.
  12.  
  13. If not within specification, substitute the TPS with a known good sensor. Recheck for proper operation. Replace the sensor, as required.
  14.  

 
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