Mazda 6 Service Manual: No.4 hard to start/long crank/erratic start/erratic crank

No.3 will not crank

No.5 engine stalls-after start/at idle

Other materials:

Mazda 6 Service Manual: Drive Selection (Some models)
Drive selection is a system to switch the vehicle's drive mode. When the sport mode is selected, vehicle's response against accelerator operation is enhanced. This provides additional quick acceleration which may be needed to safely make maneuvers such as lane changes, merging onto freeways, o ...

Mazda 6 Service Manual: Keyless Entry System
This system uses the key buttons to remotely lock and unlock the doors and the trunk lid, and opens the trunk lid. The system can start the engine without having to take the key out of your purse or pocket. It can also help you signal for attention or help. Operating the theft-deterrent syste ...