Test A: No Communication With Rap Module
- Turn ignition off. Check fuse No. 20 (7.5-amp) in instrument panel fuse block and fuse No. 9 (20-amp) in engine compartment power distribution 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 or White/Blue wire(s), then retest system.
- 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, then retest system.
Courtesy of FORD MOTOR CO.
- Disconnect RAP module 26-pin connector C336. Turn ignition on. Measure voltage between ground and RAP module 26-pin connector C336 terminal No. 25 (Black/Pink wire). If voltage is more than 10 volts, go to next step. If voltage is 10 volts or less, repair open in Black/Pink wire, then retest system.
- Turn ignition off. Measure resistance between ground and RAP module 26-pin connector C336 terminal No. 25 (Black/White wire). If resistance is less than 5 ohms, see MODULE COMMUNICATIONS NETWORK article for further diagnosis. If resistance is 5 ohms or more, repair open Black/White wire, then retest system.