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 MANUALSFORD2010FOCUS SES, 2D COUPE, STANDARDREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCESYSTEMENGINE CONTROLS - POWERTRAIN DTC CHARTS & DESCRIPTIONS (EXCEPT DIESEL & HYBRID)DTC DIAGNOSISDTC P0351: IGNITION COIL A PRIMARY/SECONDARY CIRCUIT
2010 Ford Focus SES, 2D Coupe, Standard
DTC P0351: Ignition Coil A Primary/Secondary Circuit
2010 Ford Focus SES, 2D Coupe, StandardSECTION DTC P0351: Ignition Coil A Primary/Secondary Circuit
DTC P0351: IGNITION COIL A PRIMARY/SECONDARY CIRCUIT
| Description: | Each ignition primary circuit is continuously monitored. The test fails when the powertrain control module (PCM) does not receive a valid ignition diagnostic monitor (IDM) pulse signal from the ignition module (integrated in the PCM). | ||
| Possible Causes: |
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| Diagnostic Aids: | DTC P035x only sets for a coil primary circuit failure. A secondary ignition coil or spark plug failure does not set DTC P035x. DTC P030x does not set for a coil primary circuit malfunction. DTC P035x may set with or without DTC P030x; however DTC P035x sets first. When this DTC is set, the PCM enters failure mode effects management (FMEM) which shuts down the injector for the associated cylinder in order to protect the catalytic converter. This is normal operation; do not attempt to diagnose the injector with this DTC present. If a primary coil is damaged due to a harness short to ground the PCM will not be damaged. Do not replace the PCM without verifying the coil driver functionality. Use the 12-volt non-powered test lamp to verify START/RUN voltage at the ignition coil harness connector. Check the coil driver circuit for open, short to voltage, or short to ground. |
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| Application | Key On Engine Off | Key On Engine Running | Continuous Memory |
| Coil-on-plug (COP) ignition testing | - | GO to PINPOINT TEST JF . | GO to PINPOINT TEST JF . |
| Coil pack ignition testing | - | GO to PINPOINT TEST JE . | GO to PINPOINT TEST JE . |
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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.