Circuit/System Verification
WARNING: This page is about a different car, the 2009 GMC Sierra, 2009 GMC Cab & Chassis Sierra, and 2009 Chevrolet Silverado. However, it is still accessible from the selected car via links, so may be relevant.
- Engine ON, observe the PTO In Cab Switch parameter with a scan tool. Press 1 on the PTO switch to engage PTO. The engine RPM should increase to the default engine speed within a few seconds. Press 0 to disengage PTO and to return the engine speed back to normal idle. The PTO In Cab Switch parameter should change accordingly with the depressed switch.
- Engine OFF, key out of ignition, observe the PTO Remote Switch Status with a scan tool. Enable PTO using the upfitted remote switch assembly (if equipped). The engine RPM should increase to the default engine speed within a few seconds. Use the upfitted remote switch assembly to disengage PTO and the engine should shut down. The PTO Remote Switch Status parameter should change accordingly with the depressed remote switch.