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.
2001 Ford Explorer ChassisFACTORY OEM SERVICE PROCEDURE
Test A: No Communication With Rap Module
- Turn ignition switch to LOCK position. Check fuse No. 20 (7.5-amp) in Central Junction Box (CJB) and fuse No. 9 (20-amp) in Battery Junction Box (BJB). If fuses are okay, go to next step. Replace fuse(s) if necessary. If fuse(s) fail again, check for short in Black/Pink, Light Blue/Orange or White/Blue wire(s). Recheck system operation.
- Disconnect RAP module Gray 22-pin harness connector C338. Measure voltage between ground and RAP module harness connector C338 terminal No. 12 (White/Light Blue wire). See Fig 1. If more than 10 volts exist, go to next step. If 10 volts or less exist, repair open in White/Light Blue wire between BJB and RAP module. Recheck system operation.
- Disconnect RAP module Black 26-pin harness connector C336. Turn ignition switch to RUN position. Measure voltage between ground and RAP module harness connector C336 terminal No. 25 (Black/Pink wire). See Fig 2. If more than 10 volts exist, go to next step. If 10 volts or less exist, repair open in Black/Pink wire between CJB and RAP module. Recheck system operation.
- Turn ignition switch to LOCK position. Measure resistance between ground and RAP module harness connector C338 terminal No. 14 (Black/White wire). If resistance is less than 5 ohms, diagnose network concern. See MODULE COMMUNICATIONS NETWORK - EXPLORER & MOUNTAINEER article. If resistance is 5 ohms or more, repair open in Black/White wire between RAP module and ground. Ground point is located in left front of engine compartment, near radiator. Recheck system operation.
Factory Service Tools
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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.
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