Engine Control Module Power Source Circuit: Highlander

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.

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 (Highlander)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

Fig 5: Engine Control Module Power Source Circuit Inspection - Steps 10-11 (Highlander)

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