If you have OEM Dual fire type ignition, both spark plugs are fired by the same coil at the same time.
Checking primary voltage is not going to help, you already know that the front cylinder is operating normally.
Leave the plug wires connected at the coil, but swap the wires at the spark plug ends. If the problem is still in the rear cylinder, you have eliminated the ignition system as the cause.
Checking primary voltage is not going to help, you already know that the front cylinder is operating normally.
Leave the plug wires connected at the coil, but swap the wires at the spark plug ends. If the problem is still in the rear cylinder, you have eliminated the ignition system as the cause.