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.
2008 Ford Ranger 2WD L4-2.3LFACTORY OEM SERVICE PROCEDURE
Information Bus
Description and Operation
Testing and Inspection- Initial Inspection and Diagnostic Overview
- Diagnostic Trouble Code Tests and Associated Procedures
- Symptom Related Diagnostic Procedures
- Pinpoint Tests
- Test A: The PCM Does Not Respond To The Scan Tool Or No High Speed Controller Area Network (HS-CAN) Communication
- Test B: The Occupant Classification System Module (OCSM) Does Not Communicate With the Scan Tool
- Test C: The Restraints Control Module (RCM) Does Not Respond to the Scan Tool
- Test D: The Smart Junction Box (SJB) Does Not Respond to the Scan Tool
- Test E: The Instrument Cluster (IC) Does Not Respond to the Scan Tool
- Test F: The Four Wheel Drive (4X4) Control Module Does Not Respond To The Scan Tool
- Test G: The ABS Module Does Not Respond To The Scan Tool Or No International Standards Organization (ISO) 9141 Network Communic
- Test H: Intermittent No High Speed Controller Area Network (HS-CAN) Communication, One Or More Modules Are Not Responding Durin
- Test I: No Power To The Scan Tool
- Programming and Relearning
Diagrams
Tools and Equipment
Factory Service Tools
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
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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.