Ignition Coil Case Insulation Resistance - Mazda6, Miata, Protege & Protege5
WARNING: This page is about a different car, the 2003 Mazda Protege5, 2003 Mazda Protege, 2003 Mazda MX-5 Miata, 2003 Mazda MPV, and 2003 Mazda 6. However, it is still accessible from the selected car via links, so may be relevant.
Disconnect high-tension lead. Disconnect ignition coil harness connector. On Mazda6 2.3L, measure insulation resistance from 3-pin connector terminal "B" to ignition coil case. See Fig 1. On Mazda6 3.0L, measure insulation resistance from 2-pin connector terminal "A" to ignition coil case. See Fig 2. On Miata, Protege and Protege5, measure insulation resistance from 3-pin connector terminal No. 1A to ignition coil case, and terminal No. 2A to ignition coil case. See Fig 3. If resistance reading is not more than 10 megohms, replace ignition coil.