Circuit/System Testing
WARNING: This page is about a different car, the 2007 GMC Sierra and 2007 Chevrolet Silverado. However, it is still accessible from the selected car via links, so may be relevant.
PTO In Cab Switch
- Engine ON, engage PTO. Observe the PTO In Cab Switch parameter with a scan tool. Verify that the PTO In Cab Switch parameter matches each depressed switch: RES +, SET -.
- If any one of the switches do not match accordingly with the scan too parameter, replace the PTO switch.
- If all circuits test normal, replace the PTO module.
Upfitted Remote Switch Assembly
- Engage PTO using the upfitted remote switch assembly. Observe the PTO Remote Switch Status parameter with a scan tool. Verify that the PTO Remote Switch Status parameter matches each depressed switch for increasing and decreasing engine RPM.
- If any one of the switches do not match accordingly with the scan tool parameter, replace the upfitted remote switch assembly.
- If all circuits test normal, replace the PTO module.