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.
Circuit Description
Powertrain Control Module (PCM) supplies a 5-volt reference signal and a ground circuit to Throttle Position (TP) sensor, and monitors the TP signal circuit for changes in throttle angle. TP sensor signal voltage should be about .5 volt at idle and 4.5 volts or greater at wide open throttle.
Conditions required to test for DTC are:
- DTC(s) P0106, P0107, P0108, P0171, P0172, P0200, P0300, P0301, P0302, P0303, P0304, P0325, P0335, P0341, P0342, P0404, P0405, P0440, P0442, P0452, P0453, P0502, P0506, P0507, P0601, P0602 or P1441 not set.
- TP sensor angle greater than 7 percent after attempting to auto-zero.
- ECT greater than 68°F (20°C).
- TP stable at plus or minus 2 percent.
- MAP less than 37 kPa.
- TP angle greater than specified percentages at the given RPMs for at least 6 seconds:
- 2 percent at 0 RPM
- 10 percent at 800 RPM
- 20 percent at 1600 RPM
- 25 percent at 2400 RPM
- 30 percent at 3200 RPM
- 35 percent at 4000-4800 RPM
- 40 percent at 5600 RPM
- 40 percent at 6400 RPM
NO RELATED
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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.