Which module is connected to the throttle?

Discussion in 'Gen 3 Prius Care, Maintenance & Troubleshooting' started by IwasBirchyFirst, Aug 25, 2025 at 12:41 AM.

  1. IwasBirchyFirst

    IwasBirchyFirst Junior Member

    Joined:
    May 10, 2023
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    Location:
    Dallas, TX
    Vehicle:
    2013 Prius
    Model:
    Three
    I'm trying to diagnose a P2102 Throttle actuator control motor circuit low DTC, and will post about it soon, but first, can someone tell me what to call these three modules? And does anyone have the diagram showing the connectors at each end for the TB control motor, and maybe the sensor circuits also? I need to check continuity of the wires. The TB motor resistance read within specs.

    I'm guessing that the module on the left of the three under the dash is the one that connects to the TB.
    I'm guessing that the module by the fuse box in the engine compartment is for the hybrid system.
    I'm having no luck online finding credible info on these modules.

    If I have replace one of the interior modules, how do they come out? The empty bay has a plastic hook, but I don't see that under the other three. Those wire bundles look hard to move.

    [​IMG] [​IMG]
     
  2. ChapmanF

    ChapmanF Senior Member

    Joined:
    Mar 30, 2008
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    Location:
    Indiana, USA
    Vehicle:
    2010 Prius
    Model:
    IV
    The throttle connects to the engine control module (ECM), which is shown in your second photo, next to the underhood fusebox.

    Which module is which in the ECU motel behind the glove box is something I usually forget and only look up when I need to care.

    The Location and Routing diagrams in the Electrical Wiring Diagram are good places to look when you need to care.

    Toyota Service Information and Where To Find It | PriusChat