Engine Control Module Power Source Circuit: 4Runner

For engine control module power source circuit inspection, see Fig 1-Fig 7 . 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 EFI main relay, see EFI MAIN RELAY under MODULES, MOTORS, RELAYS & SOLENOIDS.

Fig 1: Engine Control Module Power Source Circuit Description & Wiring Diagram (4Runner 4.0L)

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Fig 2: Engine Control Module Power Source Circuit Description & Wiring Diagram (4Runner 4.7L)

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Fig 3: Engine Control Module Power Source Circuit Inspection - Steps 1-3 (4Runner)

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Fig 4: Engine Control Module Power Source Circuit Inspection - Steps 4-6 (4Runner)

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Fig 5: Engine Control Module Power Source Circuit Inspection - Steps 7-9 (4Runner)

Fig 6: Engine Control Module Power Source Circuit Inspection - Step 9 Cont. (4Runner)

Fig 7: Identifying Engine Control Module Electrical Connector Terminals (4Runner)