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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: For Engine Control Module (ECM) connector terminal identification referenced to in testing procedure. See Fig 1.
NOTE: For an overall view of emission related components, see Fig 2.
Fig 1: Identifying Engine Control Module Connector Terminals
G99H08641Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Fig 2: Emission Related Component Locations
G00241710Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002