Throttle Position (TP) Sensor measures the opening angle of throttle valve and mounted on the side of the throttle body and is connected to the throttle blade shaft. The TP sensor’s resistance changes according to the throttle blade shaft position. TP Sensor has a potentiometer whose resistance changes along with the Throttle valve position. The Powertrain Control Module (PCM) provides a 5volt reference voltage to the TP Sensor. The PCM reads the voltage across the TP Sensor and converts it into throttle position. During acceleration, the TP Sensor resistance decreases. During deceleration, the TP Sensor resistance increases. The PCM uses the TP Sensor signal to adjust timing and injector pulse width. The TP Sensor signal along with the MAF sensor signal is used by the PCM to calculate engine load. Throttle angle information to the PCM to be used for the detection of engine status such as idle, part load, full throttle, and acceleration fuel enrichment.
If TPS output voltage is lower than 0.1 V, the PCM determines that a malfunction exists and a DTC is stored.
Item
Detecting Condition
Possible cause
DTC Strategy
? Rationality check
? Poor connection
? Open or short to ground in TPS circuit
? Faulty TPS
? Faulty PCM
Enable Conditions
? Engine coolant > 40?(104?)
Threshold value
? TPS output voltage is out of range.
Diagnosis Time
? Continuous
Throttle valve fully closed
0.3~0.9V
Throttle valve fully open
4.3~4.8V
Throttle valve resistance (terminals 1 and 2)
3.5~6.5k? at 20?(68?)