Ignition Coil Power Source

Turn ignition on. Using voltmeter, check for 12 volts between ignition coil positive (+) terminal and ground. If voltage is not present, check battery feed, main fuse, ignition switch and fusible links. See appropriate wiring diagram in WIRING DIAGRAMS - 2.5L article.

Fig 1: Checking Secondary Coil Winding Resistance (2.5L)

Courtesy of MAZDA MOTOR CORP.