Ignition Coil Resistance

WARNING: This page is about a different car, the 1995 Mazda RX-7. However, it is still accessible from the selected car via links, so may be relevant.

Remove primary and secondary leads from ignition coil. Using ohmmeter, check primary resistance between positive and negative terminals of coil. See Fig 1 . Resistance should be as specified in IGNITION COIL RESISTANCE table. If resistance is not as specified, replace ignition coil.
Check secondary resistance between coil towers of each coil. See Fig 2 . On leading coil of RX7, check secondary resistance between both high tension towers. On trailing coil of RX7, check secondary resistance between terminal "A" and coil tower. See Fig 2 .
Check insulation resistance of case. Using a 500-volt meter, measure insulation resistance between positive terminal and coil case. If resistance is not more than 10 megohms, replace ignition coil.

Fig 1: Checking Primary Coil Winding Resistance (Leading Side)

Courtesy of MAZDA MOTOR CORP.

Fig 2: Checking Primary Coil Winding Resistance (Trailing Side)

Courtesy of MAZDA MOTOR CORP.

IGNITION COIL RESISTANCE - Ohms @ 68°F (20°C)

Application	Primary	Secondary
Leading	0-1.0	9600-16,000
Trailing	0-1.0	Infinity