Diagnostic Aids

This test is intended to diagnose the following:

• Continuity of data lines between PCM or TCM and scan tool.
• Battery power to scan tool.
• Proper key sequence for output.

1. Check Scan Tool Connections
   
   Turn ignition off. Inspect connection between scan tool and vehicle Data Link Connector (DLC) for damaged or corroded pins. Inspect scan tool cables for damage. Repair/replace if necessary and run scan tool SYSTEM READINESS TEST to verify communication between scan tool and module. If scan tool cables and connections are okay, go to next step.
2. Check Scan Tool Power Supply
   
   Check fuse No. 6 in instrument panel fuse panel. Check for battery voltage at cigar lighter. Inspect power connection at cigar lighter. Repair as necessary. If power supply and data connections are okay, operator error may be at fault. See COMMUNICATION ERROR  under SELF-DIAGNOSTICS USING SCAN TOOL.