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 MANUALSMERCURY2009MOUNTAINEER 4.6 8, RWDREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCESYSTEMENGINE CONTROLS - PINPOINT TEST KP: CHARGE AIR COOLER (CAC) PUMP THROUGH PINPOINT TEST Z: INTERMITTENT - (EXCEPT DIESEL & HYBRID)PINPOINT TEST NC: IGNITION ENGINE SPEED INPUT CIRCUITTEST PROCEDURE
2009 Mercury Mountaineer 4.6 8, RWD
Test Procedure
2009 Mercury Mountaineer 4.6 8, RWDSECTION Test Procedure
- NC1 CONTINUOUS MEMORY DTC P0320: ERRATIC IGNITION
- Verify all 2-way radio installations. Carefully follow the manufacturer's installation instructions regarding the routing of the antenna and voltage leads.
Is a concern present?
Yes No REPAIR as necessary.
CLEAR the DTCs. REPEAT the self-test.GO to NC2. - NC2 NO START CONCERN
Is the customer complaint a no start?
Yes No GO to Pinpoint Test A . GO to NC3. - NC3 INTERMITTENT CONDITION
Is this an intermittent condition?
Yes No GO to Pinpoint Test Z . GO to Pinpoint Test JD .
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.