Engine Control Module Power Source Circuit: Tacoma

For engine control module power source circuit inspection, see Fig 1-Fig 6 . For circuit identification, see ENGINE PERFORMANCE in appropriate SYSTEM WIRING DIAGRAMS article in ELECTRICAL. Before replacing ECM, check ECM connectors and ground circuits. See ENGINE CONTROL MODULE POWER & GROUND CIRCUITS  under COMPUTERIZED ENGINE CONTROLS. To check ignition switch, see appropriate STEERING COLUMN SWITCHES article in ACCESSORIES & EQUIPMENT. To check EFI main relay, see EFI MAIN RELAY  under MODULES, MOTORS, RELAYS & SOLENOIDS.

Fig 1: Engine Control Module Power Source Circuit Description & Diagram (Tacoma)

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Fig 2: Engine Control Module Power Source Inspection - Steps 1-3 (Tacoma)

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Fig 3: Engine Control Module Power Source Inspection - Steps 4-6 (Tacoma)

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Fig 4: Engine Control Module Power Source Inspection - Steps 6 Cont.-8 (Tacoma)

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Fig 5: Engine Control Module Power Source Inspection - Step 9 (Tacoma)

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

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