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 MANUALSTOYOTA2004MATRIX XR, FWD, STANDARDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 508 (ENGINE CONTROL SYSTEM (SFI) - DIAGNOSIS)DTC P1121: COOLANT FLOW CONTROL VALVE POSITION SENSOR CIRCUIT STUCKTYPICAL MALFUNCTION THRESHOLDS
2004 Toyota Matrix XR, FWD, Standard
Typical Malfunction Thresholds
2004 Toyota Matrix XR, FWD, StandardSECTION Typical Malfunction Thresholds
WARNING: This page is about a different car, the 2004 Toyota Prius. However, it is still accessible from the selected car via links, so may be relevant.
Potentiometer detection
TANK OUTLET COOLANT TEMPERATURE DETECTION (DTC P1121)
| Either of the following conditions is met: | (a) or (b) |
|---|---|
| (a) Heat storage tank outlet coolant temperature when recover starts | 60°C (108 °F) or more |
| (b) Heat storage tank outlet coolant temperature difference during water valve check | Less than 3°C (5.4 °F) |
RENDER: 1.0x
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.