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.
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HOMESERVICE MANUALSMAZDA1999626 ES, 2.5 D, STANDARDREPAIR AND DIAGNOSISENGINE PERFORMANCETESTING & DIAGNOSISENGINE CONTROLS - SELF-DIAGNOSTICSDIAGNOSTIC TESTSDTC P0122: THROTTLE POSITION (TP) SENSOR LOW INPUTDIAGNOSTIC AIDS
1999 Mazda 626 ES, 2.5 D, Standard
Diagnostic Aids
1999 Mazda 626 ES, 2.5 D, StandardSECTION Diagnostic Aids
This test is intended to diagnose the following:
- TP sensor.
- Wiring harness circuits (PWR GND, SIG RTN, TP, VPWR and VREF).
- Powertrain Control Module (PCM). Normal range of throttle angle measurement for TP sensor is 0-85 degrees. To pass quick test procedure, range of throttle rotation (in degrees) must be within 3 percent of specification.
To prevent replacement of good components, be aware, the following non-EEC related areas may be at fault:
- Idle speed.
- Binding throttle shaft or linkage.
- TP sensor not seated.
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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.