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GMC Truck
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1994
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G 3500 1 Ton Van V8-454 7.4L
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Repair and Diagnosis
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Brakes and Traction Control
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Antilock Brakes / Traction Control Systems
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Testing and Inspection
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Reading and Clearing Diagnostic Trouble Codes
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Accessing and Reading Diagnostic Trouble Codes
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With Scan Tool
With Scan Tool
ALDL Connector Terminal Identification.:
Diagnostic trouble codes can only be read by connecting a suitable scan tool to the Data Link Connector (DLC),
Fig. 14
. Follow the instructions provided by the scan tool manufacturer.