High Idle Elevated Idle And PTO All Different Options - keywords fast off power switch take

The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in this PI.

There has been some questions regarding High Idle, Elevated Idle and PTO. The below information is to help provide additional information as to what each of the options are:

Elevated Idle- Is a standard option on all 6.6L Diesel Engines, which elevates the engine idle speed from base idle to 1050 rpms when outside temperatures are below 32°F (0°C), and the engine coolant temperature is below 150°F (65°C.) This feature enhances heater performance by raising the engine coolant temperature faster. This feature can be turned on or off, please refer to the "Duramax Diesel Supplement" Owners Manual for more information.

PTO (power take-off)- Is available as an option (RPO PTO) only on 3500 Chassis Cab models equipped with the 6.6L Diesel Engine RPO LMM and Allison 6-speed transmission RPO MW7. The PTO allows the user to create an auxiliary power source for running add-on equipment, such as salt spreaders, snow plows, winches and lift buckets. The dash mounted PTO switch is used to turn on the PTO and controls engine speed to values higher than normal base idle. For more information see the "Duramax Diesel Supplement" Owners Manual or online at "www.gmupfitter.com".

High Idle- Is available as an option (RPO UF3) on certain 2008 models with cruise control. This system can be used to increase your engine idle speed for what ever reason an owner wishes, more generator output at idle, belt driven add on equipment, etc. The manual fast idle switch is operated using the cruise control buttons located on the left hand side of the steering wheel. For more information see the Owners Manual.

Please follow this diagnostic or repair process thoroughly and complete each step. If the condition exhibited is resolved without completing every step, the remaining steps do not need to be performed.