Primary Coil Winding
1. Remove the ignition coil.
2. Measure the resistance between the following lead holes using an ohmmeter.
- If not specified, replace the ignition coil.
Specification
0.49-0.57 ohms [20°C {68°F}]

Secondary Coil Winding
1. Remove the ignition coil.
- If not specified, replace the ignition coil.
Specification
9.5-11.1kilohms

Insulation Resistance of Case
1. Disconnect the high-tension lead.
2. Disconnect the ignition coil connector.
3. Measure the insulation resistance between the following terminals and ignition coil case using an ohmmeter.
- If not specified, replace the ignition coil.
Specification
Above 10 Megohm

Ignition coil removal/installation
Spark plug removal/installationMazda 6 Service Manual: Manual Transaxle Shift Pattern
The shift pattern of the transaxle is conventional, as shown.
Depress the clutch pedal all the way down while shifting; then release it slowly.
Your vehicle is equipped with a device to prevent shifting to R (reverse) by mistake. Push the shift lever downward and shift to R.
...
Mazda 6 Service Manual: No.4 air intake mode does not change
When performing an asterisked (*) troubleshooting inspection, shake the
wiring harness and connectors while performing the inspection to discover
whether poor contact points are the cause of any intermittent malfunctions.
If there is a problem, check to make sure connectors, terminal ...