General Motors Stop-Start Technologies

General Motors introduced the first Stop-Start system on the 2014 Chevy Malibu as standard equipment and now have over 21 models using Stop-Start technologies. Implementing automated stop-start technology in today’s vehicle’s is a cost-effective way to improve fuel economy and reduce emissions. A Stop-Start system operates by shutting off the engine when the vehicle comes to a complete standstill, and automatically restarts the engine when the driver releases the brake pedal. This operating strategy is often utilized in full hybrid-electric vehicles that have powerful electric systems but is also becoming more popular in non-hybrid vehicles that use traditional starter/battery configurations.

Topics include:

• Dual battery and control methods used to isolate the electrical systems during Autostop/Start
• Robust starter motor technologies-Dual Tandem Starter design and operation
• Capacitor and DC-DC (Transformer) Control Stop-Start systems
• Common components found on each system
• Stop-Start input and output control logic
• DTC descriptors and scan tool diagnostic evaluation methods
• Important best service practices to handle working on GM vehicles equipped with Stop-Start systems.