The Electronic Throttle Control(ETC) system is made of the components throttle body, Throttle Position Sensor(TPS)1&2 and Accelerator Position Sensor(APS) 1&2. TPS1&2 are sharing the same source voltage and ground.The throttle valve opening is control by throttle motor which is controlled by Engine Control Module(ECM).The opposite position indicator shows inverted signal characteristics.TPS1 output voltage increases smoothly in proportion with the throttle valve opening angle after starting. TPS2 output voltage decreases in inverse proportion with the throttle valve opening angle after starting. TPS provides feedback to the ECM to control the throttle motor in order to control the throttle valve opening angle properly in response to the driving condition.
Checking output signals from TPS 1 and 2 under detecting condition, if output signals difference between TPS1 and TPS2 are detected more than 4.5% for the specified number of times., PCM sets P2135. And then MIL(Malfunction Indication Lamp) turns on.
Item | Detecting Condition | Possible Cause |
DTC Strategy | ● Determines if TPS#1 disagrees with TPS#2 | ● Poor connection ● Open or short in TPS circuit ● Faulty TPS ● Faulty PCM |
Enable Condition | ● Ignition "ON" | |
Threshold value | ● Difference between average values of TPS1 and TPS2 > 4.5% | |
Diagnosis Time | ● Continuous | |
MIL ON Condition | ● 1 Drivig cycle |
Throttle opening ( ° ) | Output voltage(V) [Vref=5.0] | Throttle opening ( ° ) | Output voltage(V) [Vref=5.0] | ||
TPS1 | TPS2 | TPS1 | TPS2 | ||
0° | 0.0V | 5.0V | 60° | 2.7V | 2.3V |
10° | 0.5V | 4.5V | 70° | 3.2V | 1.8V |
20° | 0.9V | 4.1V | 80° | 3.6V | 1.4V |
30° | 1.4V | 3.6V | 90° | 4.1V | 0.9V |
40° | 1.8V | 3.2V | 100° | 4.5V | 0.5V |
50° | 2.3V | 2.7V | 110° | 5.0V | 0.0V |
