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 MANUALSFORD2005TAURUS SEL, 4D SEDANREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCESYSTEMENGINE CONTROLS - DESCRIPTION & OPERATION (EXCEPT DIESEL & HYBRID)POWERTRAIN CONTROL MODULE (PCM) INPUTSPOWER TAKE-OFF (PTO) SWITCH AND CIRCUITSSTARTER MOTOR REQUEST (SMR) CIRCUIT
2005 Ford Taurus SEL, 4D Sedan
Starter Motor Request (SMR) Circuit
2005 Ford Taurus SEL, 4D SedanSECTION Starter Motor Request (SMR) Circuit
The SMR circuit provides the PCM with a signal from the ignition switch to the PCM. The input is pulled high when the key is in START position and the transmission range sensor ignition lockout circuit allows the starter to engage.
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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.