Engine Control Module Power Source Circuit: Prius

WARNING: This page does not describe the selected car, but rather 11 other vehicles, including the 2003 Toyota Tacoma, 2003 Toyota RAV4, 2003 Toyota Prius, 2003 Toyota Matrix, and 2003 Toyota MR2. However, it is still accessible from the selected car via links, so may be relevant.

WARNING: Read service precautions before proceeding with service procedure. See SERVICE PRECAUTIONS .

For engine control module power source circuit inspection, see Fig 1-Fig 6 . Before replacing ECM, check ECM connectors and ground circuits. See ENGINE CONTROL MODULE POWER & GROUND CIRCUITS .

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

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

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Fig 3: Engine Control Module Power Source Circuit Inspection - Steps 4-5 (Prius)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Fig 4: Engine Control Module Power Source Circuit Inspection - Steps 6-8 (Prius)

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

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