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HOMESERVICE MANUALSTOYOTA20184RUNNER SR5, 4WDREPAIR AND DIAGNOSISBODY & FRAMEDOOR LOCKSENGINE IMMOBILIZER SYSTEM (W/ SMART KEY SYSTEM) - DIAGNOSTICS - INTRODUCTIONENGINE IMMOBILIZER SYSTEM (W/ SMART KEY SYSTEM)HOW TO PROCEED WITH TROUBLESHOOTING [08/2015 - 08/2019]PROCEDURE
2018 Toyota 4Runner SR5, 4WD

How To Proceed With Troubleshooting [08/2015 - 08/2019]: Procedure

2018 Toyota 4Runner SR5, 4WDSECTION Procedure
  1. VEHICLE BROUGHT TO WORKSHOP 

    Result

    Proceed to
    NEXT

    Result: 

    NEXT 

    See step  2

  2. INSPECT BATTERY VOLTAGE 

    Standard voltage

    11 to 14 V

    If the voltage is below 11 V, recharge or replace the battery before proceeding.

    Result

    Proceed to
    NEXT

    Result: 

    NEXT 

    See step  3

  3. CHECK COMMUNICATION FUNCTION OF LIN COMMUNICATION SYSTEM* 
    1. Use the Techstream to check if the LIN communication system is functioning normally.

      Result

      Result Proceed to
      LIN DTC is not output A
      LIN DTC is output B

    Result: 

    B 

    GO TO LIN COMMUNICATION SYSTEM 

    (Refer to HOW TO PROCEED WITH TROUBLESHOOTING [08/2015 - ] )

    Result: 

    A 

    See step  4

  4. CHECK FOR DTC* 
    1. Check for DTCs and make a note of any codes that are output (Refer to DTC CHECK / CLEAR [08/2015 - 08/2019] ).
    2. Clear the DTCs (Refer to DTC CHECK / CLEAR [08/2015 - 08/2019] ).
    3. Recheck for DTCs (Refer to DTC CHECK / CLEAR [08/2015 - 08/2019] ). Based on the DTCs output above, try to cause the output of the same SFI system, steering lock system or engine immobilizer system DTC by reproducing the symptoms indicated by the DTC.

      Result

      Result Proceed to
      DTC is not output A
      SFI system DTC is output B
      Steering lock system DTC is output C
      Engine immobilizer system DTC is output D

    Result: 

    B 

    GO TO DIAGNOSTIC TROUBLE CODE CHART 

    (Refer to DIAGNOSTIC TROUBLE CODE CHART [08/2015 - 08/2019] )

    Result: 

    C 

    GO TO DIAGNOSTIC TROUBLE CODE CHART 

    (Refer to DIAGNOSTIC TROUBLE CODE CHART [08/2015 - 08/2019] )

    Result: 

    D 

    GO TO DIAGNOSTIC TROUBLE CODE CHART 

    (Refer to DIAGNOSTIC TROUBLE CODE CHART [08/2015 - 08/2019] )

    Result: 

    A 

    See step  5

  5. PROBLEM SYMPTOMS TABLE 
    1. Refer to Problem Symptoms Table (Refer to PROBLEM SYMPTOMS TABLE [08/2015 - 08/2019] ).

      Result

      Result Proceed to
      Fault is not listed in problem symptoms table A
      Fault is listed in problem symptoms table B

    Result: 

    B 

    See step  7

    Result: 

    A 

    See step  6

  6. OVERALL ANALYSIS AND TROUBLESHOOTING* 
    1. Data List / Active Test (Refer to DATA LIST / ACTIVE TEST [08/2015 - 08/2019] ).
    2. Terminals of ECU (Refer to TERMINALS OF ECU [08/2015 - 08/2019] ).

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    See step  7

  7. ADJUST, REPAIR OR REPLACE 

    Result

    Proceed to
    NEXT

    Result: 

    NEXT 

    See step  8

  8. CONFIRMATION TEST 

    Result

    Proceed to
    NEXT

    Result: 

    NEXT 

    END 

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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.