Scan Tool Does Not Power Up
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Scan Tool Does Not Power Up
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Diagnostic Fault Information
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Circuit
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Short to Ground
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Open/High Resistance
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Short to Voltage
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Signal Performance
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DLC B+
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1
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1
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-
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-
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DLC Ground
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-
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1
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-
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-
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1. Scan Tool Does Not Power Up
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Circuit/System Description
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The data link connector (DLC) is a standardized 16 cavity connector. Connector design and location is dictated by an industry wide standard, and is required to provide the following:
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Scan tool B+ voltage at terminal 16
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•
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Scan tool ground at terminal 4
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•
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Common ground at terminal 5
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•
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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 module sends the appropriate power mode message.
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If the B+ circuit, ground circuits, and connections of the DLC are functioning properly, the malfunction must be due to the scan tool.
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Schematic Reference
Data Communication Schematics
Connector End View Reference
Component Connector End Views
Description and Operation
Data Link Communications Description and Operation
Electrical Information Reference
Scan Tool Reference
Control Module References
for scan tool information.
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1.
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Test for less than 2.0 Ω between the ground circuits terminal 4 of the DLC and ground, and terminal 5 of the DLC and ground.
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2.
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If greater than the specified range, test the ground circuit for an open/high resistance.
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3.
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Ignition ON, verify a test lamp illuminates between the B+ circuit terminal 16 at the DLC and ground.
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4.
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If the test lamp does not illuminate, test the voltage supply circuit for a short to ground or an open/high resistance.
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5.
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If all circuits test normal, refer to the scan tool user guide.
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Perform the
Diagnostic Repair Verification
after completing the repair.
