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 MANUALSFORD2005TAURUS SEL, 4D SEDANREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 725 (MODULE COMMUNICATIONS NETWORK - F-150 & MARK LT)DIAGNOSTIC TESTSCOMMUNICATIONS NETWORKSYMPTOM CHART

2005 Ford Taurus SEL, 4D Sedan

Symptom Chart

2005 Ford Taurus SEL, 4D SedanSECTION Symptom Chart

WARNING: This page is about a different car, the 2007 Lincoln Mark LT and 2007 Ford Pickup. However, it is still accessible from the selected car via links, so may be relevant.

Symptom Chart

Condition	Possible Sources	Action
The powertrain control module (PCM) does not respond to the scan tool	Circuitry PCM	REFER to the INTRODUCTION - GASOLINE ENGINES article, Section 5, pinpoint test QA before proceeding to Pinpoint Test A. If pinpoint test QA has been completed, go to Pinpoint Test A .
The anti-lock brake system (ABS) module does not respond to the scan tool	Fuse Circuitry ABS module	Go to Pinpoint Test B .
The instrument cluster does not respond to the scan tool	Fuse Circuitry Instrument cluster	Go to Pinpoint Test C .
The electronic automatic temperature control (EATC) module does not respond to the scan tool	Fuse Circuitry EATC module	Go to Pinpoint Test D .
The vehicle security module (VSM) does not respond to the scan tool	Fuse Circuitry VSM	Go to Pinpoint Test E .
The driver seat module (DSM) does not respond to the scan tool	Fuse Circuitry DSM	Go to Pinpoint Test F .
The restraints control module (RCM) does not respond to the scan tool	Fuse Circuitry RCM	Go to Pinpoint Test G .
The parking aid module does not respond to the scan tool	Fuse Circuitry Parking aid module	Go to Pinpoint Test H .
No high speed controller area network (HS-CAN) communication, all modules are not responding	Circuitry PCM ABS module Instrument cluster	Go to Pinpoint Test I .
No universal asynchronous receiver-transmitter (UART)-based protocol (UBP) network communication	Circuitry Instrument cluster EATC module (if equipped) DSM (if equipped) VSM (if equipped)	Go to Pinpoint Test J .
No International Standards Organization (ISO) 9141 network communication	Circuitry RCM Parking aid module	Go to Pinpoint Test K .
No power to the scan tool	Fuse Circuitry Scan tool	Go to Pinpoint Test L .

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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.