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.
If the difference between modeled relative load and measured relative load is over the threshold value according to throttle position under enable conditions, ECM sets DTC P0124.
Item
Detecting Condition
Possible cause
DTC Strategy
? Signal check, wiring interruption
? Poor connection
? TPS
? ECM
Threshold value
? ?TPS signal > 30% > 3 times
Enable Conditions
-
Diagnostic Time
ITEM
Specification
TPS Resistance (?)
2? ± 20% (20?)