Mazda 6 Service Manual: No.3 will not crank

No.2 mil illuminates

No.4 hard to start/long crank/erratic start/erratic crank

Other materials:

Mazda 6 Service Manual: Illuminated Entry System
When the illuminated entry system operates, the overhead lights, the courtesy lights, and an ambient light* turn on in the following conditions: The driver's door is unlocked after the ignition is switched OFF. The ignition is switched OFF with all doors closed. NOTE (Overhead lights) ...

Mazda 6 Service Manual: Combine sensor inspection
Caution Be careful and do not allow the lateral-G sensor to fall. If by chance it is subjected to strong impact, replace it. 1. Connect the connector. 2. Turn ignition switch on, verify the voltage between terminals B and E under the following conditions. If not within the specifi ...