Initial Inspection and Diagnostic Overview

DIAGNOSTIC STARTING POINT

IMPORTANT: The following steps must be completed before using the symptom tables:

1. Perform the Diagnostic System Check - Vehicle in Vehicle DTC Information, before using the Symptom Tables in order to verify that all of the following are true:
- There are no DTCs set.
- The control modules can communicate via the serial data link. Diagnostic System Check - Vehicle
2. Review the system Description and Operation in order to familiarize yourself with the system functions. Refer to Power Take-Off (PTO) Description and Operation.

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