Diagnostic Tests: Notes

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NOTE: Before performing any diagnostic test, see SELF-DIAGNOSTIC SYSTEM for diagnostic system functions and system diagnostic procedures. Also check for any related Technical Service Bulletins (TSBs). For component location, see appropriate illustration in THEORY & OPERATION article. When performing diagnostic tests, it may be necessary to identify Engine Control Module (ECM) connector terminals which are referenced to in testing procedure. See Fig 1.

NOTE: For information on engine immobilizer system, see COMPUTERIZED ENGINE CONTROLS in THEORY & OPERATION article.

Fig 1: Identifying Engine Control Module Terminals (Component Side)