Diagnostic Aids
Perform this test when instructed during QUICK TEST or if directed by other test procedures. This test is used to diagnose the following:
- Connection between scan tool and PCM.
- Connection between scan tool and battery power supply.
- Correct key sequence executed for outputs.
- 1) Check Scan Tool Installation
Turn ignition off. Check connection between scan tool and Data Link Connector (DLC) for damage or contamination. Service as necessary. If connector is okay, go to next step. - 2) Check Scan Tool Power Supply Connector
Check connector and wiring harness cable between scan tool and battery power supply for poor connection or damage. Repair as necessary. Perform ON-BOARD SYSTEM READINESS (OSR) TEST MODE under ADDITIONAL SYSTEM FUNCTIONS to verify communication between scan tool and PCM. See scan tool manufacturer instructions, if necessary. If connector and wiring harness cable are okay, no problem with scan tool installation is indicated. Ensure correct key sequence was used to access outputs in OUTPUT TEST MODE.