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HOMESERVICE MANUALSTOYOTA2025PRIUS PLUG-IN HYBRID XSE PREMIUMREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCESYSTEMENGINE CONTROL SYSTEM - DIAGNOSTICS - INTRODUCTION (1 OF 3)SFI SYSTEMBASIC INSPECTION [12/2022 - ]PROCEDURE
2025 Toyota Prius Plug-In Hybrid XSE Premium

Basic Inspection [12/2022 - ]: Procedure

2025 Toyota Prius Plug-In Hybrid XSE PremiumSECTION Procedure
  1. CHECK AUXILIARY BATTERY VOLTAGE 
    NOTE:

    Carry out this check with the engine stopped and the ignition switch off.

    Result

    Result Proceed to
    11 V or higher OK
    Below 11 V NG

    Result: 

    NG 

    CHARGE OR REPLACE AUXILIARY BATTERY 

    Result: 

    OK 

    See step  2

  2. CHECK WHETHER ENGINE CRANKS 

    Result

    Proceed to
    OK
    NG

    Result: 

    NG 

    PROCEED TO PROBLEM SYMPTOMS TABLE. Refer to  PROBLEM SYMPTOMS TABLE [12/2022 - 03/2023]  , or refer to  PROBLEM SYMPTOMS TABLE [03/2023 - ]  

    Result: 

    OK 

    See step  3

  3. CHECK WHETHER ENGINE STARTS 

    Result

    Proceed to
    OK
    NG

    Result: 

    NG 

    See step  6

    Result: 

    OK 

    See step  4

  4. CHECK AIR CLEANER FILTER ELEMENT SUB-ASSEMBLY 
    1. Visually check that the air cleaner filter element sub-assembly is not excessively contaminated with dirt or oil.

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE AIR CLEANER FILTER ELEMENT SUB-ASSEMBLY 

    Result: 

    OK 

    See step  5

  5. CHECK IDLE SPEED 
    1. Check the engine idle speed.

      Refer to PROCEDURE - Step 8 [12/2022 - 03/2023] , or refer to PROCEDURE - Step 8 [03/2023 - ]

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    PROCEED TO PAGE AND CONTINUE TO TROUBLESHOOT 

    Result: 

    OK 

    See step  6

  6. CHECK FUEL PRESSURE 
    1. Check the fuel pressure.

      Refer to PROCEDURE - Step 2 [12/2022 - 03/2023] , or refer to PROCEDURE - Step 2 [03/2023 - ]

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    PROCEED TO PAGE AND CONTINUE TO TROUBLESHOOT 

    Result: 

    OK 

    See step  7

  7. CHECK FOR SPARK 
    1. Perform a spark test.

      Refer to PROCEDURE - Step 1

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    PROCEED TO PROBLEM SYMPTOMS TABLE. Refer to  PROBLEM SYMPTOMS TABLE [12/2022 - 03/2023]  , or refer to  PROBLEM SYMPTOMS TABLE [03/2023 - ]  

    Result: 

    NG 

    PROCEED TO PAGE AND CONTINUE TO TROUBLESHOOT 

RENDER: 1.0x

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.