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.
DTC P1120: Throttle Position (TP) Sensor Out Of Range (Low): Condition
1999 Mazda 626 ES, 2.5 D, StandardSECTION Condition
DTC P1120 indicates TP sensor closed throttle position is less than range (.19 volt). Possible causes for this fault are:
- Faulty TP sensor.
- Faulty Powertrain Control Module (PCM).
- Check Freeze Frame Data
Ensure freeze frame data is recorded. Go to next step. - Check PID Status
Turn ignition off. Connect scan tool to DLC. Access TP V PID on scan tool. If TP V PID is 0.19 volt or more, go to next step. If TP PID is below 0.19 volt, go to step 4. - Check TPS Adjustment
Check TPS adjustment. See SYSTEM & COMPONENT TESTING - EXCEPT B2500, B3000 & B4000 article. Adjust as necessary and go to next step. If TP sensor cannot be adjusted properly, replace TP sensor and retest. - Erase DTC From Memory
Clear DTC from memory. Recheck system. If DTC P1120 is reset, replace PCM and go to next step. If DTC P1120 is not reset, go to next step. - Recheck DTC
If any DTCs are present, go to appropriate test for repair. If no DTCs are present, test is complete.
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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.