Data Link Diagnostic Test

Connect scan tool to Data Link Connector (DLC), if not already connected. Turn ignition switch to RUN position. Select DATA LINK DIAGNOSTIC TEST. A test will be performed on SCP (circuits No. 914 and 915) and ISO 9141 (circuit No. 70) networks.
If scan tool displays SYSTEM PASSED, return to article that directed you here and continue diagnosis.
If scan tool does not display SYSTEM PASSED, perform the following as applicable:
- If no response from scan tool, see TEST I: NO MODULE/NETWORK COMMUNICATION - ALL MODULES under SYSTEM TESTS.
- If scan tool displays CKT 70, CKT 914 and/or CKT 915 = ECUS NO RESP/NOT EQUIP, perform appropriate test. See SYMPTOM INDEX table under SYSTEM TESTS.
- If scan tool displays CKT 70 = ALL ECUS NO RESP/NOT EQUIP, see TEST G: NO MODULE/NETWORK COMMUNICATION - ISO 9141 NETWORK under SYSTEM TESTS.
- If scan tool displays CKT 914 or CKT 915 = ALL ECUS NO RESP/NOT EQUIP, see TEST H: NO MODULE/NETWORK COMMUNICATION - SCP NETWORK under SYSTEM TESTS.
- If module in question is NO RESPONSE ON CKT 914 (BUS +) or NO RESPONSE ON CKT 915 (BUS -), perform appropriate test. See SYMPTOM INDEX table under SYSTEM TESTS.