Check VBAT For Open To Coil
WARNING: This page is about a different car, the 1994 Mazda B3000 and 1994 Mazda B2300. However, it is still accessible from the selected car via links, so may be relevant.
Turn key off and disconnect harness at coil pack. Turn key on. Measure voltage between coil pack harness terminal No. 4 and ground. If more than 10.5 volts are present, go to next step. If there is less than 10.5 volts, repair open circuit. Remove all test equipment and reconnect all components. Clear Continuous Memory and check for fault codes.