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).

NOTE: When performing diagnostic tests, it may be necessary to put transit in inspection mode so that the engine will run continuously. See INSPECTION MODE .

NOTE: When performing diagnostic tests, it may be necessary to identify Engine Control Module (ECM) and Hybrid Vehicle Electronic Control Unit (HV ECU) electrical connector terminals which are referenced to in testing procedure. See Fig 1 and Fig 2 .

Fig 1: Identifying Engine Control Module Electrical Connector Terminals

Fig 2: Identifying Hybrid Vehicle Electronic Control Unit Electrical Connector Terminals