Important: The following steps must be completed before using the symptom tables.
- Review the system Description and Operation in order to familiarize
 yourself with the system functions. Refer to 
 
Power Take-Off (PTO) Description and Operation 
.
 
- Perform the Power Take-Off (PTO) Diagnostic System Check
 before using the Symptom Tables in order to verify
 that all of the following are true:
 
Refer to
Diagnostic System Check - Power Take-Off (PTO) 
. 
| •  | The control module(s) can communicate via the serial data link. | 
 
Visual/Physical Inspection
|     •  | Inspect the easily accessible and visible system components for
 obvious damage or conditions which could cause the symptom. | 
 
|     •  | Inspect the transmission for the proper transmission fluid level. | 
 
|     •  | Inspect the hydraulic reservoir for the proper hydraulic fluid
 level. | 
 
|     •  | Inspect the upfitter connections at the transmission. | 
 
Intermittent
Faulty electrical connections or wiring may be the cause of intermittent
 conditions.
Symptom List
Refer to a symptom diagnostic procedure from the following list in order
 to diagnose the symptom:
|     •  | Power Take-Off Does Not Engage
  | 
 
|     •  | Engine RPM Does Not Increase With Power Take-Off Engaged
  | 
 
|     •  | Power Take-Off Indicator Inoperative
  |