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 MANUALSMERCURY2010MARINER PREMIER, 2.5 7, FWDREPAIR AND DIAGNOSISENGINE PERFORMANCETESTING & DIAGNOSISENGINE CONTROLS - PINPOINT TEST DL: CYLINDER HEAD TEMPERATURE (CHT) SENSOR THROUGH PINPOINT TEST DX: ENGINE COOLANT TEMPERATURE (ECT) SENSOR - (EXCEPT DIESEL & HYBRID)PINPOINT TEST DL: CYLINDER HEAD TEMPERATURE (CHT) SENSORNOTES
2010 Mercury Mariner Premier, 2.5 7, FWD
Pinpoint Test DL: Cylinder Head Temperature (CHT) Sensor: Notes
2010 Mercury Mariner Premier, 2.5 7, FWDSECTION Notes
NOTE:
Proceed to DTC testing steps listed in FAULT CODE SETTING CONDITION table of fault code setting condition.
FAULT CODE SETTING CONDITION
| Application | Key On Engine Off | Key On Engine Running | Continuous Memory |
| Vehicles with only a (CHT) sensor | GO to PINPOINT TEST DL . | GO to PINPOINT TEST DL . | - |
| All others | GO to PINPOINT TEST DX . | GO to PINPOINT TEST DX . | - |
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.