Mazda 6 Service Manual: No.6 cranks normally but will not start

No.5 engine stalls-after start/at idle

No.7 slow return to idle

Other materials:

Mazda 6 Service Manual: Driver-side air bag module removal/installation
Warning Handling the air bag module improperly can accidentally deploy the air bag module, which may seriously injure you. Read AIR BAG SYSTEM SERVICE WARNINGS before handling the air bag module. (See SERVICE WARNINGS.) Due to the adoption of 2-step deployment control in both the driv ...

Mazda 6 Service Manual: Automatic Brake Operation Display (Type A Instrument Cluster)
“Smart City Brake Support activated” is indicated in the active driving display, and “Smart City Brake Support Activated” is indicated in the multi-information display after the SCBS brakes or the brake assist (SCBS brake assist) is operated. NOTE The collision warning beep sounds ...