Data Link Diagnostic Test

Connect New Generation Star (NGS) tester 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 BUS (circuits 914 and 915) and ISO 9141 (circuit 70) network.
If NGS tester displays SYSTEM PASSED, return to article that directed you here and continue diagnosis.
If NGS tester does not display SYSTEM PASSED, perform the following as applicable:
- If no response from NGS tester, see TEST H: NO MODULE/NETWORK COMMUNICATION - ALL MODULES under SYSTEM TESTS.
- If NGS tester displays CKT 70, CKT 914 and/or CKT 915 = ECUS NO RESP/NOT EQUIP, repair by symptom. See SYMPTOM INDEX table under SYSTEM TESTS.
- If NGS tester displays CKT 70 = ALL ECUS NO RESP/NOT EQUIP, see TEST F: NO MODULE/NETWORK COMMUNICATION - ISO 9141 NETWORK under SYSTEM TESTS.
- If NGS tester displays CKT 914 or CKT 915 = ALL ECUS NO RESP/NOT EQUIP, see TEST G: NO MODULE/NETWORK COMMUNICATION - SCP BUS under SYSTEM TESTS.
- If module in question is NO RESPONSE ON CKT 914 (BUS +) or NO RESPONSE ON CKT 915 (BUS -), repair by symptom. See SYMPTOM INDEX table under SYSTEM TESTS.