Diagnostic Tests: Notes

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). To identify circuits and wire colors referenced in testing, see ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL. Use illustration to identify ECM connector terminals. See Fig 1.

Fig 1: Identifying Engine Control Module Connector Terminals