Test A - Yellow Light Off & Does Not Self-Check

Ensure control module connector is fully engaged. If not, engage connector, and retest system. If connector is engaged, disconnect battery. Unplug control module connector. Measure resistance between connector pin No. 4 and ground. See Fig 1 .

Fig 1: Identifying Control Module Pins
Courtesy of FORD MOTOR CO.
If resistance is one ohm or more, check for open circuit between pin No. 4 and ground. If resistance is less than one ohm, reconnect battery. Turn ignition on. Check voltage at connector pin No. 7. If voltage is 9 volts or more, replace control module.
If voltage is less than 9 volts, check Yellow ABS light 15-amp fuse. If fuse is bad, check for short between fuse and warning lights. Replace fuse and retest system. If fuse is okay, check voltage at fuse. If voltage is less than 9 volts, check fuse panel or vehicle electrical system.
If voltage is 9 volts or more, check warning light bulb. If bulb is bad, replace bulb and retest system. If bulb is okay, repair open in wiring between warning light fuse and control module connector pin No. 7.