Monitor Description

The ECM uses the throttle position sensor to monitor the throttle valve opening angle.

1. There is a specific voltage difference expected between VTA1 and VTA2 for each throttle opening angle.
   • If the difference between VTA1 and VTA2 is incorrect, the ECM interprets this as a default and will set a DTC.
2. VTA and VTA2 each have a specific voltage operating range.
   • If VTA or VTA2 is out of the normal operating range, the ECM interprets this as a fault and will set a DTC.
3. VTA and VTA2 should never be close to the same voltage levels.
   • If VTA is within 0.02V of VTA2, the ECM interprets this as a short circuit in the throttle position sensor system and will set a DTC.