Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Monitor Description
The ECM uses the throttle position sensor to monitor the throttle valve opening angle.
This sensor includes two signals: VTA1 and VTA2. VTA1 is used to detect the throttle opening angle and VTA2 is used to detect malfunction in VTA1. There are several checks that the ECM performs to confirm proper operation of the throttle position sensor and VTA1.
The output voltage difference between VTA1 and VTA2 multiplied by 0.8 (corrected by learning value) should be more than 0.8V and less than 1.6 V. If the voltage output difference deviates from this range, the ECM concludes the throttle position sensor has a malfunction. The ECM will turn on the MIL and a DTC is set.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.