What is a Factory Service Manual
A Factory Service Manual or FSM is a service auto repair manual that is published by your Original Equipment Manufacturer (OEM). The word "Factory” basically means the unit where automobile parts or devices are manufactured and supplied as the product by the branded company or manufacturer. In this type of manuals, they address the exact procedures and ways on how to repair, troubleshoot, diagnose, and maintain your vehicle and parts.
FSMs are mostly more informative and endorse better quality in terms of presentation. Since the source of the service manual contents come from your car's manufacturer, you can often trust and rely more on information they provide in the manual. It is always better to go for the specific repair manual for your car if you have the budget; otherwise there are also Aftermarket Service Manuals available in the market for lower price, such as Haines, Clinton, and etc.
Factory Manuals can also be purchased in two forms: Book and CD. For more information on this, you can read the Difference between Factory Service Manual Book vs CD here.