Data Link Diagnostic Test

Connect New Generation Star (NGS) tester to Data Link Connector (DLC), if not already connected. Select vehicle to be tested from NGS tester menu.
Turn ignition on. Rotate dial on NGS tester to menu item DIAGNOSTIC DATA LINK and press trigger. A test will be performed on the SCP communication network bus and the ISO 9141 communication link.
If NGS tester displays CKT 914 (+) = SYSTEM PASSED and CKT 915 (-) = SYSTEM PASSED, SCP communication network is okay. If NGS tester displays CKT 70 = SYSTEM PASSED, ISO 9141 communication network is operating properly. Return to article that directed you here and continue diagnosis.
If NGS tester does not display CKT 914 (+) = SYSTEM PASSED, CKT 915 (-) = SYSTEM PASSED and/or CKT 70 = SYSTEM PASSED, perform the following as applicable.
- If no response from NGS tester, go to TEST I: NO MODULE/NETWORK COMMUNICATION - NO POWER TO NGS THROUGH DLC under SYSTEM TESTS.
- If NGS tester displays CKT 70, CKT 914 and/or CKT 915 = SOME ECUS NO RESP/NOT EQUIP, repair by symptom. See SYMPTOM TEST INDEX .
- If NGS tester displays CKT 70 = ALL ECUS NO RESP/NOT EQUIP, go to TEST G: NO MODULE/NETWORK COMMUNICATION - ISO 9141 NETWORK under SYSTEM TESTS.
- If NGS tester displays CKT 914 = ALL ECUS NO RESP/NOT EQUIP, go to TEST H: NO MODULE/NETWORK COMMUNICATION - SCP NETWORK under SYSTEM TESTS.
- If NGS tester displays CKT 915 = ALL ECUS NO RESP/NOT EQUIP, go to TEST H: NO MODULE/NETWORK COMMUNICATION - SCP NETWORK under SYSTEM TESTS.
- If NGS tester displays NO RESPONSE/NOT EQUIPPED for module in question, repair by symptom. See SYMPTOM TEST INDEX .
- If NGS tester displays NO RESPONSE ON CKT 914 (BUS +) for module in question, repair by symptom. See SYMPTOM TEST INDEX .
- If NGS tester displays NO RESPONSE ON CKT 915 (BUS -) for module in question, repair by symptom. See SYMPTOM TEST INDEX .