Power & Ground Circuits

For testing of Engine Control Module (ECM) power and ground circuits, see ENGINE CONTROL MODULE POWER SOURCE CIRCUIT . Also see PIN VOLTAGE CHARTS article. For illustration of ECM location, see THEORY & OPERATION article. For identification of ECM electrical connector terminals. See Fig 1-Fig 11 .

Fig 1: Identifying Engine Control Module Electrical Connector Terminals (Camry)

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Fig 2: Identifying Engine Control Module Electrical Connector Terminals (Camry Solara)

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Fig 3: Identifying Engine Control Module Electrical Connector Terminals (Celica)

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Fig 4: Identifying Engine Control Module Electrical Connector Terminals (Corolla With 3-Speed A/T Or M/T)

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Fig 5: Identifying Engine Control Module Electrical Connector Terminals (Corolla With 4-Speed A/T)

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Fig 6: Identifying Engine Control Module Electrical Connector Terminals (ECHO)

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Fig 7: Identifying Engine Control Module Electrical Connector Terminals (Highlander)

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Fig 8: Identifying Engine Control Module Electrical Connector Terminals (MR2)

Fig 9: Identifying Engine Control Module Electrical Connector Terminals (Prius)

Fig 10: Identifying Engine Control Module Electrical Connector Terminals (RAV4)

Fig 11: Identifying Engine Control Module Electrical Connector Terminals (Tacoma)