C 3500 HD Truck 2WD V8-8.1L VIN G (2002)
Power Take-Off: Initial Inspection and Diagnostic Overview
Diagnostic Starting Point
Begin the system diagnosis with the Diagnostic System Check - Power Take-Off (PTO).
The Diagnostic System Check - PTO will provide the following information:
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The identification of the control module which commands the system
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The ability of the control module to communicate through the serial data circuit
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The identification of any stored diagnostic trouble codes (DTCs) and their status
The use of Diagnostic System Check - Power Take-Off (PTO) will identify the correct procedure for diagnosing the system and where the procedure is
located.
Diagnostic System Check
TEST DESCRIPTION
Steps 1-6
The numbers below refer to the step numbers on the diagnostic table.
2. Lack of communication may be due to a partial or total malfunction of the class 2 serial data circuit. The specified procedure will determine the
particular condition.
3. The presence of DTCs indicates that the PCM or TAC has detected a fault.
4. The presence of DTCs which begin with "U" indicate some other module is not communicating. The specified procedure will compile all the
available information before tests are performed.
5. This step insures that the PTO options in the scan tool are set according to the upfitters recommendations.
