Power & Ground Circuits

For testing of Engine Control Module (ECM) power and ground circuits, see ENGINE CONTROL MODULE (ECM) 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 10 .

Fig 1: Identifying ECM Electrical Connector Terminals (Avalon)

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Fig 2: Identifying ECM Electrical Connector Terminals (Camry & Camry Solara)

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Fig 3: Identifying ECM Electrical Connector Terminals (Land Cruiser)

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Fig 4: Identifying ECM Electrical Connector Terminals (Sienna)

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Fig 5: Identifying ECM Electrical Connector Terminals (Tacoma Calif. Emission Vehicles)

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Fig 6: Identifying ECM Electrical Connector Terminals (Tacoma Except Calif. Emission Vehicles)

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Fig 7: Identifying ECM Electrical Connector Terminals (Tundra 3.4L V6 Calif. Emission Vehicles)

Fig 8: Identifying ECM Electrical Connector Terminals (Tundra 3.4L V6 Except Calif. Emission Vehicles)

Fig 9: Identifying ECM Electrical Connector Terminals (Tundra 4.7L V8)

Fig 10: Identifying ECM Electrical Connector Terminals (4Runner)