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Preliminary Procedure

  1. Connect NGS tester to Data Link Connector (DLC). Using NGS tester, perform DATA LINK DIAGNOSTIC TEST. If NGS tester does not communicate with vehicle, see appropriate MODULE COMMUNICATIONS NETWORK article to diagnose network concern. If NGS tester displays NO RESP/NOT EQUIP for Generic Electronic Module (GEM), perform TEST E: NO COMMUNICATION WITH GEM under SYSTEM TESTS.
  2. If NGS tester displays SYSTEM PASSED for GEM, retrieve and record continuous DTCs. Erase continuous DTCs. Perform GEM On-Demand self-test diagnostics using NGS tester. If any GEM DTCs are retrieved, perform appropriate test under SYSTEM TESTS. See GENERIC ELECTRONIC MODULE (GEM) DTC IDENTIFICATION  table. If no DTCs are retrieved, perform appropriate test under SYMPTOM TESTS. See SYMPTOM CHART table.
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