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.
2003 Ford Mustang Mach 1, AutomaticFACTORY OEM SERVICE PROCEDURE
Module Communications Network System
- Specifications
- Description And Operation
- Diagnostic And Testing
- Communications Network
- Notes
- Special Tool(s)
- Principles of Operation
- Inspection and Verification
- System Precheck
- Symptom Chart
- Pinpoint Tests
- Notes
- Pinpoint Test A: The Module Does Not Respond To Diagnostic Tool - Anti-Lock Brake Control Module
- Pinpoint Test B: The Module Does Not Respond To Diagnostic Tool - Generic Electronic Module (Gem)
- Pinpoint Test C: The Module Does Not Respond To Diagnostic Tool - Restraint Control Module (RCM)
- Pinpoint Test D: The Module Does Not Respond To Diagnostic Tool - Instrument Cluster
- Pinpoint Test E: The Module Does Not Respond To Diagnostic Tool - Powertrain Control Module (Pcm)
- Pinpoint Test F: No Module/Network Communication - ISO 9141 Communication Network
- Pinpoint Test G: No Module/Network Communication - SCP Network
- Pinpoint Test H: No Module/Network Communication - No Power To Diagnostic Tool
- Communications Network
- General Procedures
Factory Service Tools
Use the Manual With the Right Hardware
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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.