One coil does nothing when selected in the coil test.

A solenoid does not fire in the diagnostic coil test

Cause: A blown fuse, a wire off the coil lug, a break further up the daisy-chained power wire, a winding broken off its lug, or a bad coil diode.

Checks

• On WWF Royal Rumble and later, confirm the coin door is shut.
• Check every fuse.
• With the game off, look at the coil for a loose or cut wire on a lug.
• Follow the power wire (on the banded end of the diode) back toward earlier coils; a break there kills every coil downstream.
• Look for a winding that has pulled away from its solder lug.
• Check the diode on the coil.

Fix

• Replace the fuse or reattach the wire.
• Scrape or sand the enamel off a broken winding end and resolder it to the lug.
• Replace a broken diode.

Systems

• Data East CPU Version 1/2
• Data East CPU Version 3
• Data East/Sega CPU Version 3b

Related tips

• A coil has power but never fires
• Coil does not work: quick checklist
• Voltage on only one lug of a coil
• Special coil locks on only when a game starts or diagnostics begin (pre-Rev 3)
• Only flash lamps work when a game starts (L/R reversed games)
• Replacing a solenoid coil
• Version 3 CPU fires special coils once per switch closure
• Testing a coil diode

Source: Repairing DataEast 1987 (Laser War) to Sega 1995 (Batman Forever), Part Two, Clay Harrell (pinrepair.com)