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.
Diagnostic Aids
If DTC P0453 is also set, a short to voltage on 5-volt reference circuit may exist. See 5-VOLT REFERENCE CIRCUIT ERROR DIAGNOSIS under SYSTEM TESTS.
DTC will set if either MAP or TP is out of range. To distinguish which one has failed, review failure records and attempt to duplicate conditions.
Check sensor and PCM electrical connection for corrosion. Using scan tool, check for a shifted MAP sensor. See MAP SENSOR VOLTAGE RANGE table. Compare this reading to a known-good vehicle with the same sensor. Readings should be within 0.4 volt.
Use scan tool to monitor TP sensor as accelerator pedal is slowly depressed. Voltage should change smoothly from 0.35 volt at closed throttle, to 4.45-4.85 volts at wide open throttle.
| Altitude (Feet) | Volts |
|---|---|
| Less Than 1000 | 3.8-5.5 |
| 1000-2000 | 3.6-5.3 |
| 2000-3000 | 3.5-5.1 |
| 3000-4000 | 3.3-5.0 |
| 4000-5000 | 3.2-4.8 |
| 5000-6000 | 3.0-4.6 |
| 6000-7000 | 2.9-4.5 |
| 7000-8000 | 2.8-4.3 |
| 8000-9000 | 2.6-4.2 |
| 9000-10,000 | 2.5-4.0 |
NO RELATED
Use the Manual With the Right Hardware
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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.