Test A: No Communication With Rap Module
- Turn ignition off. Check fuse No. 20 (7.5-amp) in central junction box and fuse No. 9 (20-amp) in battery junction box. 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 22-pin connector C338. Measure voltage between ground and RAP module 22-pin connector C338 terminal No. 12 (White/Blue wire). See Fig 1. If voltage is more than 10 volts, go to next step. If voltage is 10 volts or less, repair open in White/Light Blue wire. Recheck system operation.
- Disconnect RAP module 26-pin connector C336. Turn ignition switch to RUN position. Measure voltage between ground and RAP module 26-pin connector C336 terminal No. 25 (Black/Pink wire). See Fig 2. If voltage is more than 10 volts, go to next step. If voltage is 10 volts or less, repair open in Black/Pink wire. Recheck system operation.
- Turn ignition off. Measure resistance between ground and RAP module 22-pin connector C338 terminal No. 14 (Black/White wire). If resistance is less than 5 ohms, diagnose network concern. See appropriate
MODULE COMMUNICATIONS NETWORK article. If resistance is 5 ohms or more, repair open Black/White wire. Recheck system operation.
Courtesy of FORD MOTOR CO.
Courtesy of FORD MOTOR CO.