Diagnostic Aids
Perform this test when directed here. 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.
- Step 1) Check Scan Tool Connections Turn ignition off. Inspect the connections between scan tool and vehicle 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.
- 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/data connections okay, operator error may be at fault. See SCAN TOOL COMMUNICATION ERROR .