Hi my 1990 b2600 check engine light came on, when I grounded the single wire thats attached to the green plug I then turned the ignition on. The check engine light came on but did not flash. What am I doing wrong? The engine was warmed up. thanks
The MIL should not flash. The grounded wire should be a test light (or buzzer, as Mazda's scan tool of the era indicates).
This is according to the scanned service manual on the Mazda Minitruckin website.