Colorado 2WD V8-5.3L (2009)
required to provide the following:
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Scan tool power battery positive voltage at terminal 16
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Scan tool power ground at terminal 4
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Common signal ground at terminal 5
Diagnostic Aids
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The scan tool will power up with the ignition OFF. Some modules however, will not communicate unless the ignition is ON and the power mode
master (PMM) module sends the appropriate power mode message.
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If the battery positive voltage, ground circuits and connections of the DLC are functioning properly, the malfunction must be due to the scan
tool/CANdi module.
Reference Information
Schematic Reference
Data Communication Schematics (See: Diagrams/Electrical Diagrams)
Connector End View Reference
Component Connector End Views (See: Diagrams/Connector Views)
Description and Operation
Data Link Communications Description and Operation (See: Description and Operation)
Electrical Information Reference
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Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics)
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Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics)
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Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics)
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Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics)
Scan Tool Reference
Control Module References (See: Testing and Inspection/Programming and Relearning) for scan tool information
Circuit/System Testing
1. Ignition ON, test for battery voltage between the battery positive voltage circuit of the DLC and ground.
‹› If less than battery voltage, test the voltage supply circuit for a short to ground or an open/high resistance.
2. Test for less than 1.0 ohm between the ground circuit of the DLC and ground.
‹› If greater than the specified range, test the ground circuit for an open/high resistance.
3. If all tests normal, refer to the scan tool/CANdi module user guide.
