Self-Diagnostic System

Connect New Generation Star (NGS) tester to Data Link Connector (DLC). Using NGS tester, perform data link diagnostics test. See DATA LINK DIAGNOSTIC TEST under SELF-DIAGNOSTIC SYSTEM in appropriate MODULE COMMUNICATIONS NETWORK article in ACCESSORIES & EQUIPMENT. If NGS tester displays CKT914, CKT915 or CKT70=ALL ECUS NO RESP/NOT EQUIP, repair module communications concern. See appropriate MODULE COMMUNICATIONS NETWORK article in ACCESSORIES & EQUIPMENT. If NGS tester displays NO RESP/NOT EQUIP for Power train Control Module (PCM), see appropriate SELF-DIAGNOSTICS article in ENGINE PERFORMANCE.

If NGS tester responds with SYSTEM PASSED, retrieve and record continuous DTCs. Erase continuous DTCs. Using NGS tester, perform PCM self-test. Perform appropriate test in accordance with DTC retrieved. See POWERTRAIN CONTROL MODULE DIAGNOSTIC TROUBLE CODE INDEX  table. Codes listed in this table are only for charging system related codes. For complete DTC listing and testing procedures, see appropriate SELF-DIAGNOSTICS article in ENGINE PERFORMANCE. If no DTCs are retrieved, repair by symptom. See SYMPTOM INDEX  table under SYSTEM TESTS.