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 DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 335 (SYMPTOM TROUBLESHOOTING (ENGINE CONTROL SYSTEM AJ))ENGINE CONTROL SYSTEM OPERATION INSPECTIONELECTRONIC THROTTLE CONTROL INSPECTIONTHROTTLE POSITION (TP) SWEEP INSPECTION
1999 Mazda 626 ES, 2.5 D, Standard
Throttle position (TP) sweep inspection
1999 Mazda 626 ES, 2.5 D, StandardSECTION Throttle position (TP) sweep inspection
WARNING: This page is about a different car, the 2005 Mazda 6. However, it is still accessible from the selected car via links, so may be relevant.
- Connect the WDS or equivalent to the DLC-2.
- Turn ignition switch to ON position.
- Verify that following DTCs are not displayed:
- P0121, P0122, P0123, P0221, P0222, P0223, P2100, P2101, P2102, P2103, P2107, P2108, P2119, P2122, P2123, P2127, P2128, P2135, P2136
- If any DTC is displayed, perform DTC inspection. (See DTC TABLE .)
- P0121, P0122, P0123, P0221, P0222, P0223, P2100, P2101, P2102, P2103, P2107, P2108, P2119, P2122, P2123, P2127, P2128, P2135, P2136
- Access TP_REL PID.
- Verify that the PID reading is within the CTP value. (See
PCM INSPECTION
.)
- If the PID reading is out of range, perform the following:
- Remove air duct from throttle body.
- Verify that throttle valve moves when the accelerator pedal is depressed.
- If the throttle valve moves, inspect the following:
- TP sensor and related harness
- If the throttle valve does not move, inspect the following:
- Throttle actuator control motor and related harness
- If the PID reading is out of range, perform the following:
- Gradually move the throttle valve and verify that the PID reading increases linearly.
- If the PID reading drops momentarily, inspect the following:
- TP sensor
- If the PID reading drops momentarily, inspect the following:
- Fully depress the accelerator pedal and verify that the PID reading is within the WOT value. (See
PCM INSPECTION
.)
- If the PID reading is out of range, perform the following:
- Remove air duct from throttle valve body.
- Verify that the throttle valve moves when the accelerator pedal is depressed.
- If the throttle valve moves, inspect the TP sensor and related harness.
- If the throttle valve does not move, inspect the throttle actuator control motor and related harness.
- If the PID reading is out of range, perform the following:
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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.