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Home >> GMC >> 2002 >> Jimmy 2D Utility, Part Time, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 1334 (Data Link Communication System) >> Diagnostic Information and Procedures >> Scan Tool Does Not Communicate with VCM/PCM >> Diagnostic Aids

Diagnostic Aids

WARNING: This page is about a different car, the 2004 Pontiac Vibe. However, it is still accessible from the selected car via links, so may be relevant.

Some scan tools may require an external power supply. Ensure the scan tool is correctly connected to the power feed.

Ensure that the correct application (model year, carline, VIN code) has been selected on the scan tool. If communications are still not established, try the scan tool on another vehicle in order to ensure that the scan tool or the connecting cables are not the cause of the malfunction. Always try the scan tool on a vehicle that uses the same DLC terminal for serial data communication.

An intermittent malfunction may be caused by a fault in the Heated Oxygen Sensor (HO2S) circuit. Inspect the wiring harness and components for an intermittent condition. Refer to Intermittent Conditions in Engine Controls.

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