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.
Test Procedure
- KC1 CHECK FOR DIAGNOSTIC TROUBLE CODES (DTCS)
Are DTCs P025A, P025B, P025C, P025D, P027A, P027B, P0627, P166A, P2632, U0109, U016C, U210B or U210C present?
Yes No For DTCs P0627 or P2632, GO to KC8.
For DTC P166A, GO to KC29.
For DTCs U210B or U210C, GO to KC23.
For all others, GO to KC2 .RETURN to NO DIAGNOSTIC TROUBLE CODES (DTCS) PRESENT SYMPTOM CHART INDEX for further direction. - KC2 CHECK THE VOLTAGE TO THE FUEL PUMP CONTROL MODULE NOTE: The Mustang 5.8L is equipped with two fuel pump control modules. Diagnose the fuel pump control module related to the current DTC.
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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.
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