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.
Multiplexing Implementation
Currently Ford Motor Company uses 2 different types of communication language protocols to communicate with the powertrain control module (PCM). These protocols are controller area network (CAN) and standard corporate protocol (SCP). The Ford GT and Ranger use the SCP protocol for PCM communication with the diagnostic tool. All other vehicles use the CAN protocol for PCM communication with the diagnostic tool.
For additional information about the module communications network, refer to the appropriate MODULE COMMUNICATIONS NETWORK article .
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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.