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 376 (MODULE COMMUNICATIONS NETWORK SYSTEM)DIAGNOSIS AND TESTINGCOMMUNICATIONS NETWORK - HYBRIDSYMPTOM CHART

2009 Mercury Milan Premier, 3.0 1, AWD

Symptom Chart

2009 Mercury Milan Premier, 3.0 1, AWDSECTION Symptom Chart

WARNING: This page is about a different car, the 2006 Mercury Mariner and 2006 Ford Escape. However, it is still accessible from the selected car via links, so may be relevant.

SYMPTOM CHART

Condition	Possible Sources	Action
The restraint control module (RCM) does not respond to the diagnostic tool	Circuit or connection in the international standards organization (ISO) 9141 communication network. RCM	GO to PINPOINT TEST B .
The four-wheel drive (4WD) control module does not respond to the diagnostic tool	Circuit or connection in the high speed controller area network (CAN) 4WD control module	GO to PINPOINT TEST D .
The power steering control module does not respond to the diagnostic tool	Circuit or connection in the high speed controller area network (CAN) Power steering control module	GO to PINPOINT TEST J .
The transaxle control module (TCM) does not respond to the diagnostic tool	Circuit or connection in the high speed controller area network (CAN) TCM	GO to PINPOINT TEST K .
The traction battery control module (TBCM) does not respond to the diagnostic tool	Circuit or connection in the high speed controller area network (CAN) TBCM	GO to PINPOINT TEST P .
The anti-lock brake system (ABS) module does not respond to the diagnostic tool	Circuit or connection in the high speed controller area network (CAN) ABS module	GO to PINPOINT TEST L .
The instrument cluster does not respond to the diagnostic tool	Circuit or connection in the high speed controller area network (CAN) Circuit or connection in the medium speed CAN Instrument cluster	GO to PINPOINT TEST M .
The powertrain control module (PCM) does not respond to the diagnostic tool	Circuit or connection in high speed controller area network (CAN) PCM	GO to PINPOINT TEST N .
The smart junction box (SJB) does not respond to the diagnostic tool	Circuit or connection in the medium speed controller area network (CAN) SJB	GO to PINPOINT TEST O .
No medium speed controller area network (CAN) communication	Circuit or connection in the medium speed CAN Medium speed CAN networked modules	GO to PINPOINT TEST O .
No high speed controller area network (CAN) communication	Circuit or connection in the high speed CAN High speed CAN networked modules	GO to PINPOINT TEST P .
No international standards organization (ISO) 9141 communication network communication	Circuit or connection in the ISO 9141 communication network ISO 9141 communication networked modules	GO to PINPOINT TEST F .
No module/network communication - no power to the diagnostic tool	Data link connector (DLC) Fuse Circuitry Diagnostic tool	GO to PINPOINT TEST I .

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.