Sierra 1500 2WD V8-6.0L Hybrid (2010)
Power Take-Off: Testing and Inspection
Power Take-Off (PTO) Indicator Inoperative
Power Take-Off (PTO) Indicator Inoperative
Diagnostic Instructions
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Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System
Check - Vehicle) prior to using this diagnostic procedure.
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Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an
overview of the diagnostic approach.
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Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure Instructions
)provides an overview of each diagnostic category.
Circuit/System Description
The power take-off (PTO) is an upfitter integrated system that allows the user to create an auxiliary power source. The PTO system specifically controls
engine speed to values higher than normal base idle, PTO load relay engagement, and remote starting and shutdown of the engine. When the operator
requests PTO using either the PTO switch or PTO remote, the engine RPM will increase to a default standby speed. The engine control module (ECM)
converts the data from the engine speed sensor to a 2 pulses/engine revolution signal. When PTO is engaged, the power take-off module (PTOM) sends a
GMLAN serial data message to the ECM requesting engine speeds, in accordance with the depressed switches from the PTO switch or remote.
Reference Information
Schematic Reference
Power Take-Off (PTO) Schematics ()
Connector End View Reference
Component Connector End Views (See: Diagrams/Connector Views)
Description and Operation
Power Take-Off (PTO) Description and Operation ()
Electrical Information Reference
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Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Circuit
Testing/Circuit Testing)
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Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Connector
Repairs/Connector Repairs)
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Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/General
Electrical Diagnostic Procedures/Circuit Testing/Testing for Intermittent Conditions and Poor Connections)
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Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Wiring
Repairs/Wiring Repairs)
Scan Tool Reference
Control Module References (See: Testing and Inspection/Programming and Relearning)for scan tool information
Circuit/System Verification
1. Verify that the interior backlighting system operate normally. Refer to Interior Lighting Systems Description and Operation (See: Lighting and
Horns/Description and Operation/Interior Lighting Systems).
2. Ignition ON, install a scan tool and verify that DTC P260D is not set as current.
‹› If the specified DTC is set as current, refer to DTC P260D ().
3. Ignition ON, with the scan tool, command the PTO Indicator ON and OFF. The PTO indicator in the PTO switch should illuminate ON and OFF
accordingly.
‹› If the indicator is illuminates ON and OFF accordingly, replace the PTO module.
Circuit/System Testing
Important: If the interior backlighting is malfunctioning, refer to Interior Backlighting Malfunction (w/AN3) (See: Lighting and Horns/Testing
and Inspection/Interior Backlighting Malfunction (w/AN3))Interior Backlighting Malfunction (w/o AN3) (See: Lighting and Horns/Testing and
Inspection/Interior Backlighting Malfunction (w/o AN3)) before performing this diagnostic.
