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 DIAGNOSIS (SINGLE PAGE)ACCESSORIES & EQUIPMENTCOMMUNICATION DEVICESMULTIFUNCTION ELECTRONIC MODULESDIAGNOSIS AND TESTINGSMART JUNCTION BOX (SJB)INSPECTION AND VERIFICATION
2010 Mercury Mariner Premier, 2.5 7, FWD
Inspection and Verification
2010 Mercury Mariner Premier, 2.5 7, FWDSECTION Inspection and Verification
- Verify the customer concern.
- Visually inspect for obvious signs of electrical damage.VISUAL INSPECTION CHART
Electrical - Smart Junction Box (SJB) fuse 5 (10A)
- Wiring, terminals or connectors
- If an obvious cause for an observed or reported concern is found, correct the cause (if possible) before proceeding to the next step.
- If the cause is not visually evident, connect the scan tool to the Data Link Connector (DLC).
- If the scan tool does not communicate with the VCM:
- Check the VCM connection to the vehicle.
- Check the scan tool connection to the VCM .
- Refer to PINPOINT TEST W: NO POWER TO THE SCAN TOOL , No Power To The Scan Tool, to diagnose no power to the scan tool.
- If the scan tool does not communicate with the vehicle:
- Verify the ignition key is in the ON position.
- Verify the scan tool operation with a known good vehicle.
- Refer to PINPOINT TEST A: THE PCM DOES NOT RESPOND TO THE SCAN TOOL to diagnose no response from the PCM.
- Carry out the network test:
- If the scan tool responds with no communication for one or more modules, refer to PINPOINT TESTS .
- If the network test passes, retrieve and record the continuous memory DTCs.
- Clear the continuous DTCs and carry out the self-test diagnostics for the SJB .
- If the DTCs retrieved are related to the concern, go to DTC CHARTS . For all other DTCs, refer to the DIAGNOSTIC TROUBLE CODE (DTC) CHART .
- If no DTCs related to the concern are retrieved, verify the symptom. GO to SYMPTOM CHART .
NOTE:
Make sure to use the latest scan tool software release.
NOTE:
The Vehicle Communication Module (VCM) prove-out confirms power and ground from the DLC are provided to the VCM
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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.