WARNING: This page is about a different car, the 2000 Ford Pickup, 2000 Ford Econoline, and 2000 Ford Contour. However, it is still accessible from the selected car via links, so may be relevant.
For additional testing of bi-fuel relay module input and output VPWR and ground circuits, see TEST AA
, AB
, AC
or AD
under SYSTEM TESTS (BI-FUEL) in SELF-DIAGNOSTICS - EEC-V (BI-FUEL) article