Test FD - Introduction

NOTE: Perform this test when Service Code 74 or 75 is displayed during QUICK TEST.

NOTE: To prevent replacement of good components, be aware that the following non-EEC related areas may be at fault: brakelight bulb, brakelight switch, or brakelight fuse. This test is intended to diagnose a faulty BOO circuit or ECA.

Fig 1: Aerostar BOO Circuits

Fig 2: Bronco & "F" Series Pickup (Except 7.3L Diesel) BOO Ckts

Fig 3: Bronco & "F" Series 7.3L Diesel BOO Circuits

Fig 4: Bronco II & Ranger (Except 4.0L) BOO Circuits

Fig 5: Bronco II & Ranger 4.0L BOO Circuits

Fig 6: "E" Series Van BOO Circuits