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 MANUALSMERCURY2009MILAN PREMIER, 3.0 1, AWDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 939 (MODULE COMMUNICATIONS NETWORK SYSTEM)DIAGNOSTIC TESTSCOMMUNICATIONS NETWORK - HYBRIDINSPECTION AND VERIFICATION
2009 Mercury Milan Premier, 3.0 1, AWD
Inspection and Verification
2009 Mercury Milan Premier, 3.0 1, AWDSECTION Inspection and Verification
WARNING: This page is about a different car, the 2007 Mercury Mariner and 2007 Ford Escape. However, it is still accessible from the selected car via links, so may be relevant.
- Verify the customer concern.
- Visually inspect the following for obvious signs of electrical damage.VISUAL INSPECTION CHART
Electrical - Battery junction box (BJB) fuse(s):
- 1 (5A) (no communication with anti-lock brake system [ABS] module)
- 3 (5A) (no communication with transmission control module [TCM])
- 4 (7.5A) (no communication with powertrain control module [PCM], traction battery control module [TBCM])
- 8 (10A) (no communication with TCM)
- 25 (50A) (no communication with power steering control [PSC] module)
- 30 (40A) (no communication with smart junction box [SJB])
- 32 (50A) (no communication with PSC module)
- SJB fuse(s):
- 5 (2A) (no communication with PCM)
- 7 (10A) (no communication with instrument cluster, no power to scan tool)
- 18 (10A) (no communication with four wheel drive [4WD] control module)
- 22 (10A) (no communication with instrument cluster)
- 28 (10A) (no communication with instrument cluster)
- 29 (10A) (no communication with parking aid module)
- 33 (15A) (no communication with restraints control module [RCM])
- 34 (5A) (no communication with PSC module)
- 35 (5A) (no communication with 4WD control module)
- Data link connector (DLC)
- Wiring harness
- Circuitry
- Battery junction box (BJB) fuse(s):
- If an obvious cause for an observed or reported concern is found, correct the cause (if possible) before proceeding to the next step.
NOTE:
Make sure to use the latest scan tool software release.
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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.