Retrieving Codes

Connect New Generation Star (NGS) tester into Data Link Connector (DLC), located below instrument panel. Using NGS tester, perform data link diagnostics test. See DATA LINK DIAGNOSTIC TEST in MODULE COMMUNICATIONS NETWORK - TRIBUTE article. If NGS tester responds with CKT914, CKT915 or CKT70=ALL ECUS NO RESP/NOT EQUIP, repair module communications concern. See MODULE COMMUNICATIONS NETWORK - TRIBUTE article. If NGS tester displays NO RESP/NOT EQUIP for instrument cluster, perform TEST A: NO COMMUNICATION WITH INSTRUMENT CLUSTER  . If NGS tester displays NO RESP/NOT EQUIP for Generic Electronic Module (GEM), perform TEST B: NO COMMUNICATION WITH GENERIC ELECTRONIC MODULE  . If NGS tester displays NO RESP/NOT EQUIP for Powertrain Control Module (PCM), repair engine performance concern. 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 instrument cluster, GEM or PCM self-test in accordance with DTC retrieved. See INSTRUMENT CLUSTER DIAGNOSTIC TROUBLE CODE INDEX  and GENERIC ELECTRONIC MODULE DIAGNOSTIC TROUBLE CODE INDEX  tables. Codes listed in these tables are only for testing covered in this article. For other DTCs, see MODULE COMMUNICATIONS NETWORK - ESCAPE article. If no DTCs are retrieved, repair by symptom. See SYMPTOM INDEX  table under SYSTEM TESTS.