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 bus (circuits No. 914 and 915) for the module communications network and the ISO 9141 communication link (circuit No. 70).
- If NGS tester displays CKT 914 (+) = SYSTEM PASSED and CKT 915 (-) = SYSTEM PASSED, module communications network is okay. If NGS tester displays CKT 70 = SYSTEM PASSED, ISO 9141 communication link 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 CKT 70 = SYSTEM PASSED, perform the following as applicable.
- If no response from NGS tester, perform TEST H: NO MODULE/NETWORK COMMUNICATION under SYSTEM TESTS.
- If NGS tester displays CKT 70, CKT 914 and/or CKT 915 = SOME ECUS NO RESP/NOT EQUIP, perform appropriate test for module not responding. See SYMPTOM INDEX table.
- If NGS tester displays CKT 70 = ALL ECUS NO RESP/NOT EQUIP, perform TEST G: NO MODULE/NETWORK COMMUNICATION - ISO 9141 LINK under SYSTEM TESTS.
- If NGS tester displays CKT 914 = ALL ECUS NO RESP/NOT EQUIP, perform TEST F: NO MODULE/NETWORK COMMUNICATION - BUS LINK under SYSTEM TESTS.
- If NGS tester displays CKT 915 = ALL ECUS NO RESP/NOT EQUIP, perform TEST F: NO MODULE/NETWORK COMMUNICATION - BUS LINK under SYSTEM TESTS.
- If module in question is NO RESPONSE/NOT EQUIPPED, perform appropriate test for module not responding. See SYMPTOM INDEX table.
- If module in question is NO RESPONSE ON CKT 914 (BUS +), perform appropriate test for module not responding. See SYMPTOM INDEX table.
- If module in question is NO RESPONSE ON CKT 915 (BUS -), perform appropriate test for module not responding. See SYMPTOM INDEX table.
SYMPTOM INDEX
| Symptom | Perform Test |
|---|---|
| Anti-Lock Brake System (ABS) Does Not Respond To NGS Tester | A |
| Remote Climate Control (RCC) Module Does Not Respond To NGS Tester | B |
| Generic Electronic Module (GEM) Does Not Respond To NGS Tester | C |
| Restraint Control Module (RCM) Does Not Respond To NGS Tester | D |
| Powertrain Control Module (PCM) Does Not Respond To NGS Tester | E |
| No Module/Network Communication - Bus Link | F |
| No Module/Network Communication - ISO 9141 Link | G |
| No Module/Network Communication | H |