The Throttle Position Sensor (TPS) is mounted on the throttle body and detects the opening angle of the throttle plate.The TPS has a variable resistor (potentiometer) whose characteristic is the resistance changing according to the throttle angle. During acceleration, the TPS resistance between the reference 5V and the signal terminal decreases and output voltage increases; during deceleration, the TPS resistance increases and TPS output voltage decreases.The ECM supplies a reference 5V to the TPS and the output voltage increases directly with the opening of the throttle valve. The TPS output voltage will vary from 0.2~0.8V at closed throttle to 4.3~4.8V at wide-open throttle.The ECM determines operating conditions such as idle (closed throttle), part load, acceleration/deceleration, and wide-open throttle from the TPS. Also The ECM uses the Mass Air Flow Sensor (MAFS) or Manifold Absolute Pressure Sensor (MAPS) signal along with the TPS signal to adjust fuel injection duration and ignition timing.
If the sensor input value of TPS is lower or higher than the threshold value which is depending on MAF(MAP) more 300sec, ECM sets DTC P0068.
Item
Detecting Condition
Possible Cause
DTC Strategy
Rationality check (Correlation of actual and secondary load)
Poor connection
TPS
MAFS(MAPS)
Case1
Enable
Conditions
More than 20sec after engine start
Threshold Value
Integral value of the ratio between measured eng. load andmodeled eng. load = 1.32
Case2
Engine speed = target speed
Integral value of the ratio between measured eng. load andmodeled eng. load = 0.68
Diagnostic Time
25sec
MIL On Condition
-
Specification
Coil Resistance (O)
1.6 ~ 2.4 [20 ? 68 ?]
As often as possible, the MAPS signal should be compared with the TPS signal. Check whether the MAPS and TPS signals increase at the same time when accelerating. During acceleration, the MAPS output voltage increases; during deceleration, the MAPS output voltage decreases.